CN106830561A - A kind of town sewage treatment system of low energy consumption - Google Patents

Abstract

The invention discloses a kind of town sewage treatment system of low energy consumption, including the MO BAF reactors, BTF reactors, more medium filter and the clear water reserviors that are sequentially connected by pipeline, the MO BAF reactors, BTF reactors, more medium filter are circumscribed with backwashing pump, MO BAF reactors, BTF reactors are also circumscribed with backwash blower fan and oxygen supply air blower, and the MO BAF reactors are that micro- oxygen technology is applied into the sewage disposal device that is constituted in BAF.The sewage disposal system, aeration rate is smaller than traditional handicraft, and energy consumption is low, and effluent quality effect is good and stable；Good denitrogenation and dephosphorization effect is small to oxygen and carbon source demand amount.

Description

A Low Energy Consumption Urban Sewage Treatment System

technical field

The invention belongs to the technical field of sewage treatment, and in particular relates to a low energy consumption urban sewage treatment system.

Background technique

Biological aerated filter, referred to as BAF, is a new type of biofilm sewage treatment process developed in Europe and the United States in the late 1980s. Nitrogen and phosphorus removal. Biological aerated filter is currently widely used in small-scale domestic sewage treatment, and the effluent after treatment usually reaches the first-class B standard. The biological aerated filter process has the following disadvantages: 1. The backwash of the biological aerated filter is one of the key factors determining the operation of the filter. If the filter material is not flushed sufficiently, clumping may occur, resulting in failure of the process during operation. . During operation, backwash effluent flows back into the primary settling tank, which has a large impact load on the primary settling tank. In addition, improper design or operation management will cause problems such as filter material loss with water; 2. The biological aerated filter process is aimed at the poor Raising organic wastewater may cause excessive loss of carbon source due to insufficient nutrition and excessive aeration, and the removal rate of N and P is underground; 3. The unreasonable selection of filter materials in traditional biological aerated filters causes excessive loss of filter layers, resulting in backwashing The frequency is too high or the total pressure of the aeration fan is increased, and the energy consumption is relatively high; 4. The operation of the biological aerated filter is disturbed by the filter layer due to aeration, which makes it difficult to guarantee the suspended solids or other indicators in the effluent.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide a low energy consumption urban sewage treatment system.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a kind of low-energy urban sewage treatment system, comprising the MO-BAF reactor, BTF reactor, multimedia filter and clear water tank connected in sequence by pipelines, the MO - The BAF reactor, the BTF reactor, and the multimedia filter are all externally connected with a backwash pump and a backwash fan, and the MO-BAF reactor and the BTF reactor are all externally connected with an oxygen supply blower, and the MO-BAF reactor is the The micro-oxygen technology is applied to the sewage treatment equipment formed in the BAF.

Preferably, the MO-BAF reactor includes a reaction tank body 1, and the reaction tank body 1 is sequentially provided with a water distribution system 1, a biological filter layer 1, a supporting layer 1, an aeration system 1, and a collector Water system 1, the middle part of the biological filter layer 1 is equipped with a horizontal aeration and purging device 1 and a dissolved oxygen measuring instrument, the upper part of the side wall of the reaction tank body 1 is provided with a water inlet pipe 1 and a backwash drain pipe 1, and the lower part of the side wall A water outlet pipe 1 and a backwash water inlet pipe 1 are provided. An anti-filter material loss device 1 is also provided on the inner wall of the reaction tank body 1 at the mouth of the backwash drain pipe 1. The reaction tank body 1 is also provided with a Backwash air inlet pipe 1, one end of the backwash air inlet pipe 1 is located on the reaction tank body 1, and the other end is located in the water collection system 1, the aeration system 1 is connected to an oxygen supply blower, and the backwash water inlet pipe 1 is connected to an external A backwash pump, the backwash inlet pipe is connected to an external backwash fan.

Preferably, the biological filter layer-consists of a light biological carrier and upper/middle/lower dominant microorganisms attached to the light biological carrier from top to bottom, and the upper dominant microorganisms-include anoxic heterotrophic microorganisms, For ammonifying microorganisms, the dominant microorganisms in the middle layer include nitrifying and short-range nitrifying microorganisms, and the dominant microorganisms in the lower layer include nitrifying microorganisms and aerobic heterotrophic microorganisms.

Preferably, the supporting layer 3 is composed of a cobblestone layer 1 and a cobblestone layer 2 from top to bottom, the cobblestones filled in the cobblestone layer 1 have a particle size of 8-16 mm, and the pebbles filled in the cobblestone layer 2 have a particle size of 16-32 mm.

Preferably, the upper part of the side wall of the reaction tank body 1 is located between the backwash drain pipe 1 and the water inlet pipe 1, and an overflow pipe 1 is also provided.

Preferably, the lower part of the side wall of the reaction tank body is near the bottom of the reaction tank body and is also provided with a vent pipe 1, and the vent pipe 1 and the backwash drain pipe 1 are arranged on the same side of the reaction tank body 1, and the reverse The water outlet port of the washing drain pipe one is connected with the empty pipe one.

Preferably, the BTF reactor includes a reaction tank body 2, and the reaction tank body 2 is sequentially provided with a water distribution system 2, a natural drop water reoxygenation zone, a biological filter layer 2, a supporting layer 2, an exposure layer Gas system two, water collection system two and water production catchment area, the middle part of the biological filter layer two is equipped with a horizontal aeration and purging device two, the upper part of the side wall of the reaction tank body two is located at the second water distribution system and the natural drop water complex The oxygen zone is provided with the water inlet pipe 2 and the backwash drain pipe 2 respectively, and the lower part of the side wall is located in the water production catchment area and is equipped with the water outlet pipe 2 and the backwash water inlet pipe 2, and the reaction tank body 2 is also equipped with a backwash inlet pipe Trachea 2, one end of the backwash air inlet pipe 2 is located on the reaction tank body 2, and the other end is located in the water collection system 2, the aeration system 2 is externally connected to an oxygen supply blower, and the backwash water inlet pipe 2 is externally connected to a backwash pump , the backwash inlet pipe two is externally connected with a backwash fan.

Preferably, the biological filter layer 2 is composed of a light biological carrier and upper/middle/lower dominant microorganisms 2 attached to the light biological carrier from top to bottom, and the upper dominant microorganisms 2 include aerobic heterotrophic microorganisms and For autotrophic nitrifying bacteria, the dominant microorganisms in the middle/lower layer include nitrifying and short-range nitrifying microorganisms.

Preferably, the supporting layer 2 is composed of cobblestone layer 3 and cobblestone layer 4 from top to bottom, the particle size of pebbles filled in cobblestone layer 3 is 8-16mm, and the particle size of pebbles filled in cobblestone layer 4 is 16-32mm.

Preferably, the upper part of the side wall of the reaction tank body 2 is located between the water inlet pipe 2 and the backwash drain pipe 2, and an overflow pipe 2 is also provided, and the water inlet port of the overflow pipe 2 contacts the filter material loss prevention device 2 .

Preferably, the lower part of the side wall of the reaction tank body 2 is near the bottom of the reaction tank body 2. There is also a vent pipe 2, and the vent pipe 2 and the backwash drain pipe 2 are arranged on the same side of the reaction tank body 2, and the backwash The water outlet port of the second drain pipe is connected with the second vent pipe.

Preferably, the multimedia filter includes a housing, and the housing is sequentially provided with a vortex micro-flocculation reactor, a multimedia filter layer, a support layer 3, a water collection system 3, and the upper and middle parts of the housing , The side wall of the lower part is respectively provided with water inlet pipe 3, backwash drain pipe 3 and water outlet pipe 3. The lower part of the water collection system 3, the outlet pipe 3 is also provided with the backwash inlet pipe 3 connected with it, the backwash inlet pipe 3 is externally connected to the backwash pump, and the waste water enters the upper part of the vortex micro-flocculation reactor in the shell through the water inlet pipe 3, and then After passing through the vortex micro-flocculation reactor, multi-media filter layer, support layer 3, and water collection system 3 in sequence, it is discharged from the outlet pipe 3. When the outlet water quality is not up to standard, the backwash water enters the water collection through the backwash inlet pipe 3. The lower part of the system 3 makes it pass through the water collection system 3, supporting layer 3, and multi-media filter layer 3 in sequence, and finally the mud-water mixture generated by backwashing is discharged through the backwashing drain pipe 3, and the backwashing fan is externally connected to the control on the outlet pipe 38 Be connected with water outlet pipe three 38 before the valve.

Preferably, the multimedia filter layer includes a quartz sand layer, anthracite layer, and corundum layer arranged from top to bottom, the particle size of the quartz sand is 1-2 mm, the particle size of the anthracite is 1-2 mm, and the particle size of the emery The diameter is 2-4mm.

Preferably, an emptying pipe is also provided on the side wall of the lower part of the housing, and the emptying pipe is located at the lower part of the water collection system three,

The mouth of the backwash drain pipe three is in communication with the emptying pipe.

Preferably, disinfection equipment is also installed in the clear water pool.

Preferably, the first water collection system, the second water collection system and the third water collection system all include a filter plate and several filter heads arranged on the filter plate.

The urban sewage treatment system with low energy consumption provided by the invention has the following beneficial effects:

1. Apply micro-oxygen technology to BAF to form a unique MO-BAF reactor, which reduces energy consumption and carbon source requirements. Due to the use of micro-oxygen technology and BTF technology, the aeration volume is smaller than the traditional process, and the energy consumption is low.

2. Because the BTF is not aerated, the filter layer is not disturbed, and the water quality of the effluent is good and stable.

3. The denitrification and phosphorus removal effect is good, because this process adopts micro-oxygen technology to form denitrification and phosphorus removal bacteria, nitrification and phosphorus removal bacteria and other biological communities in the MO-BAF reactor, and the demand for oxygen and carbon sources is small.

4. In MO-BAF reactor and BTF reactor, light biological carrier is used, which is not easy to block.

5. Anti-filter clogging device is used to prevent the loss of filter material, save filler and ensure water quality.

Description of drawings

Fig. 1 is the structural representation of the urban sewage treatment system of low energy consumption of the present invention;

Fig. 2 is the structural representation of MO-BAF sewage treatment equipment among the present invention;

Fig. 3 is the structural representation of the sewage treatment equipment based on biological trickling filtration technology among the present invention;

Fig. 4 is a structural schematic diagram of the multimedia filter in the present invention.

Explanation of reference signs: 11. Reaction tank body 1; 12. Water distribution system 1; 13. Biological filter layer 1; 14. Supporting layer 1; 15. Water collection system 1; 16. Horizontal aeration and purging device 1; 17 1. Dissolved oxygen measuring instrument; 18. Inlet pipe one; 19. Backwash drain pipe one; 110. Outlet pipe one; 111. Backwash water inlet pipe one; 112. Filter material loss prevention device one; 113. Backwash air inlet pipe one ; 114, aeration component one; 115, air supply pipe; 116, automatic aeration control valve; 117, air supply regulating valve; 118, overflow pipe one; 119, vent pipe one; 21, reaction tank body two; 22 2. Water distribution system 2; 23. Natural drop water reoxygenation zone; 24. Biological filtration layer 2; 25. Supporting layer 2; 26. Water collection system 2; 27. Water production catchment area; 28. Horizontal aeration and purge Device two; 29, water inlet pipe two; 210, backwash drain pipe two; 211, water outlet pipe two; 212, backwash water inlet pipe two; 213, backwash air inlet pipe two; 214, aeration component two; 215, auxiliary aeration Trachea; 216, auxiliary aeration valve; 217, filter material loss prevention device two; 218, overflow pipe two; 219, vent pipe two; 31, shell; 32, eddy current micro-flocculation reactor; 33, multi-media Filter layer; 34. Support layer 3; 35. Water collection system 3; 36. Water inlet pipe 3; 37. Backwash drain pipe 3; 38. Outlet pipe 3; 39. Backwash water inlet pipe 3; 310. Empty pipe .

detailed description

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

As shown in Figure 1, a kind of low energy consumption urban sewage treatment system of the present invention, comprises the MO-BAF reactor, BTF reactor, multimedia filter and clear water tank that are connected successively by pipeline, described MO-BAF reactor , BTF reactor, and multimedia filter are all externally connected with a backwash pump and a backwash fan, and the MO-BAF reactor and the BTF reactor are all externally connected with an oxygen supply blower. Sewage treatment equipment constituted in BAF. Disinfection equipment is also installed in the clear water pool or disinfectant is directly added.

As shown in Figure 1, the MO-BAF reactor includes a reaction tank body-11, and the reaction tank body-11 is sequentially provided with a water distribution system-12, a biological filter layer-13, a supporting layer-14, an exposure layer from top to bottom. Gas system one and water collection system one 15. The middle part of the biological filter layer 13 is equipped with a horizontal aeration purging device 16 and a dissolved oxygen measuring instrument 17 . The upper part of the side wall of the reaction tank body one 11 is provided with a water inlet pipe one 18 and a backwash drain pipe one 19, and the lower part of its side wall is provided with a water outlet pipe one 110 and a backwash water inlet pipe one 111. The inside wall of the reaction tank body one 11 is located at the mouth of the backwash drain pipe one 19 and is also provided with a filter material loss prevention device one 112 . The reaction tank body one 11 is also provided with a backwash air intake pipe one 113, one end of the backwash air intake pipe one 113 is located above the reaction tank body one 11, and the other end is located at the water collection system one 15.

In this embodiment, the outer shape of the reaction tank body 11 is a cylindrical structure, and it is obvious that a cubic shape or other outer shape structures commonly used in the field can also be adopted. In order to facilitate the description of the location and connection relationship of each component, the structural diagram shown in Figure 1 is now used to describe the position of the drain pipe on the left, but in the actual design process, the relative position of each component shall prevail. The water inlet pipe one 18 is arranged on the upper part of the left side wall of the reaction tank body one 11 and is located at the location of the water distribution system one 12 . Below the water inlet pipe one 18, there is an overflow pipe one 118, and the overflow pipe one 118 is horizontally positioned under the water distribution system one 12. The backwash drainage pipe one 19 is located below the overflow pipe one 118 and its horizontal position is above the biological filter layer one 13 . One end of the outlet pipe 110 is set at the water collection system 15, the other end protrudes from the upper part of the left side wall of the reaction tank body 11, and the horizontal position of the other end protrudes above the biological filter layer 13 for backwashing. Under the drainpipe one 19 . The setting position of the water outlet pipe 110 can also be located directly at the water collection system at the lower part of the side wall of the reaction tank body 11. Near the bottom of the left side wall lower part of the reaction tank body one 11, located at the bottom of the water collection system, is provided with a vent pipe one 119, and the vent pipe one 119 is used for water venting during equipment maintenance or system washing and drainage. The outlet port of the backwash drain pipe one 19 communicates with the vent pipe one 119 . The backwash water inlet pipe 111 is arranged at the lower part of the right side wall of the reaction tank body 11 and is located at the lower part of the water collection system 15 . The aeration system is externally connected to an oxygen supply blower, the backwash water inlet pipe 111 is externally connected to a backwash pump, and the backwash air intake pipe 113 is externally connected to a backwash fan.

The water distribution system 12 arranged on the uppermost layer in the reaction tank body 11 is used for uniform water distribution, so that the water entering the reaction tank body 11 can be evenly sprayed to the upper part of the biological filter layer 13 .

Biological filtration layer 13 is composed of light biological carrier and upper layer/middle layer/lower layer dominant microorganism 1 attached to the light biological carrier from top to bottom. Among them, the light biological carrier is sintered from various silicate minerals and pore-forming agents, and modified by coating with iron salts and calcium salts. In this example, the silicate minerals are clay, illite, and fly ash mixed in any proportion, the ratio of silicate minerals to pore-forming agent is 100:5, and the modification method adopted is: take a certain amount of The ceramsite sintered by a variety of silicate minerals and pore-forming agents is added to the CaCl2 solution with a concentration of 0.3mol/L and the FeCl3 solution with a concentration of 0.3mol/L, and then continuously added NaO with a mass fraction of 10%. Adjust the pH value of the solution to keep the pH value constant at about 12, stir vigorously for 4 hours, then take out the ceramsite and rinse until the pH is neutral, and bake it in a kiln at 400°C for 4 hours. The light biological carrier is not easy to clog, and the modified light biological carrier has higher nitrogen and phosphorus removal efficiency, more uniform surface roughness, and better film-hanging effect. It is worth noting that the lightweight biological carrier can also be made using other conventional materials and methods in the art, and the modification method is not limited to this example. The dominant microorganisms attached to the light biological carrier are different from top to bottom: the dominant microorganisms in the upper layer are mainly composed of anoxic heterotrophic microorganisms and ammonifying microorganisms; the dominant microorganisms in the middle layer are mainly composed of nitrifying and short-range nitrifying microorganisms; the dominant microorganisms in the lower layer— It is mainly composed of nitrifying microorganisms and aerobic heterotrophic microorganisms.

Supporting layer 14 is composed of cobblestone layer 1 and cobblestone layer 2 from top to bottom. The particle size of pebbles filled in cobblestone layer 1 is 8-16mm, and the particle size of pebbles filled in cobblestone layer 2 is 16-32mm. The main function of supporting layer 14 is to evenly distribute water, support the multi-media filter layer, and prevent sand from running out during the filter process. The specific composition of the supporting layer 14 is not limited thereto, and any other conventional supporting layer arrangement in the art can be adopted on the basis of achieving the above-mentioned purpose. An aeration system 1 is arranged at the lower part of the supporting layer, and the aeration system 1 is connected with an external blower, and the external oxygen supply blower supplies air to the aeration system 1. The first aeration system consists of an aeration component one 114 and an air supply pipe 115 communicating with one end of the aeration component one 114 . The air supply pipe 115 is provided with an automatic aeration control valve 116 and an air supply regulating valve 117 . Aeration component 114 is composed of special aeration head, aeration branch pipe, support and so on. The water collection system 15 is composed of a filter plate and several filter heads arranged on the filter plate, and is used for evenly collecting the filtered water of the filter layer and evenly distributing the backwash water during backwashing. The horizontal aeration and purging device one 16 is horizontally arranged in the middle of the biological filter layer one 13, which can reduce backwash water volume and energy consumption, and ensure that the filter layer is not hardened. Dissolved oxygen measuring instrument 17 is arranged vertically, and the end is arranged in the middle part of biological filter layer one 13, and the display end is positioned on reaction pool body one 11, is used for controlling the dissolved oxygen in the middle layer at a suitable index. Micro-aerobic technology, that is, the use of dissolved oxygen measuring instruments (sensors) to automatically control the aeration intensity, so that a micro-aerobic environment appears in the reactor, and the micro-aerobic environment can form short-term nitrification and denitrification reaction conditions, which is conducive to reducing carbon sources consume.

The above-mentioned MO-BAF reactor applies micro-oxygenation technology (Micro-oxygenation, MO) to the biological aerated filter (BAF), and the aeration volume is smaller than the traditional technology, which can effectively reduce energy consumption. , in the MO-BAF reactor, biological communities such as denitrification and phosphorus removal bacteria and nitrification phosphorus removal bacteria are formed, the demand for oxygen and carbon sources is reduced, and it has a good effect of nitrogen and phosphorus removal. In addition, in biological filtration The horizontal purge cleaning device installed in the middle of the layer can reduce the amount of backwash water and energy consumption, and ensure that the filter layer is not hardened. Further, the filter material loss prevention device can prevent the filter material from being lost during the backwashing process, saving fillers and ensuring water quality.

As shown in Figure 3, the BTF reactor, the reaction tank body 21, the reaction tank body 221 is sequentially provided with a water distribution system 22, a natural drop water reoxygenation zone 23, a biological filter layer 24, a support Layer two 25, aeration system two, water collection system two 26 and water production catchment area 27, the middle part of biological filtration layer two 24 is equipped with horizontal aeration and purging device two 28, and the upper part of the side wall of the reaction tank body two 21 is located at the water distribution The 22 places of the system 2 and the 23 places of the natural falling water reoxygenation area are respectively provided with the water inlet pipe 29 and the backwash drain pipe 210. The water pipe two 212 and the reaction pool body two 21 are also provided with a backwash air intake pipe 213, one end of the backwash air intake pipe 213 is located on the reaction pool body two 21, and the other end is located at the water collection system two 26.

In this embodiment, the outer shape of the reaction tank body 21 is a cylindrical structure, and it is obvious that a cubic shape or other outer shape structures conventionally used in the field can also be adopted. In order to facilitate the description of the setting position and connection relationship of each component, according to the structural diagram shown in Figure 1, the position of the water inlet pipe 229 is taken as the left side for description, but in the actual design process, the relative position of each component shall prevail . The water inlet pipe 2 29 is arranged on the upper part of the left side wall of the reaction tank body 2 21, and is located at the location of the water distribution system 2 22 . Located below the water inlet pipe 2 29, there is an overflow pipe 2 218. The horizontal position of the overflow pipe 2 218 is below the water distribution system 2 22, on the top of the natural drop water reoxygenation zone 23. The second backwash drain pipe 210 is located below the second overflow pipe 218 , close to the second overflow pipe 218 , and its horizontal position is above the second biological filter layer 24 . Backwash drainage pipe 2 210 is provided with a backwash drainage control valve. The inner wall of the reaction tank body 2 21 is located at the mouth of the backwash drain pipe 210 and the overflow pipe 2 218, and there is also a filter material loss preventing device 2 217 . The outlet pipe 2 211 is located at the 27 place of the water production catchment area. Near the bottom of the left side wall lower part of the reaction tank body two 21, there is a vent pipe two 219 below the position of the outlet pipe two 211, and the vent pipe two 219 is used for water venting during equipment maintenance or system washing and drainage. The outlet port of the backwash drain pipe 2 210 communicates with the vent pipe 2 219 . The backwash water inlet pipe 2 212 is set at the lower part of the right side wall of the reaction tank body 2 21, and is located at the water production catchment area 27. Backwash inlet pipe 2 212 is provided with a backwash control valve. Aeration system 2 is externally connected to an oxygen supply blower, backwash inlet pipe 2 211 is externally connected to a backwash pump, and backwash inlet pipe 2 213 is externally connected to a backwash fan.

The uppermost water distribution system 22 arranged in the reaction tank body 2 21 is used for uniform water distribution, so that the water entering the reaction tank body 2 21 can be evenly sprayed to the top of the biological filter layer 24 .

Biological filter layer 2 24 is composed of light biological carrier and upper/middle/lower dominant microorganisms 2 attached to the light biological carrier from top to bottom. Among them, the light biological carrier is sintered from various silicate minerals and pore-forming agents, and modified by coating with iron salts and calcium salts. In this example, the silicate minerals are clay, illite, and fly ash mixed in any proportion, the ratio of silicate minerals to pore-forming agent is 100:5, and the modification method adopted is: take a certain amount of The ceramsite sintered by a variety of silicate minerals and pore-forming agents is added to the CaCl2 solution with a concentration of 0.3mol/L and the FeCl3 solution with a concentration of 0.3mol/L, and then continuously added NaO with a mass fraction of 10%. Adjust the pH value of the solution to keep the pH value constant at about 12, stir vigorously for 4 hours, then take out the ceramsite and rinse until the pH is neutral, and bake it in a kiln at 400°C for 4 hours. The light biological carrier is not easy to block, and the modified light biological carrier has a higher adsorption effect on phosphate phosphorus. Microscopically, a reaction environment of internal anoxic and external aerobic is formed on the surface of the biological carrier, which is beneficial to the total nitrogen. Remove, the surface roughness is more uniform, and the effect of hanging film is better. It is worth noting that the lightweight biological carrier can also be made using other conventional materials and methods in the art, and the modification method is not limited to this example. The dominant microorganisms attached to the light biological carrier are different from top to bottom: the dominant microorganisms in the upper layer are mainly composed of aerobic heterotrophic microorganisms and autotrophic nitrifying bacteria that mainly remove organic matter and ammonia nitrogen; the dominant microorganisms in the middle/lower layers are mainly composed of Nitrifying and short-range denitrifying microbial composition.

Supporting layer 2 25 is composed of cobblestone layer 3 and cobblestone layer 4 from top to bottom. The particle size of pebbles filled in cobblestone layer 3 is 8-16mm, and the particle size of pebbles filled in cobblestone layer 4 is 16-32mm. The main function of the supporting layer 25 is to evenly distribute water, support the multi-media filter layer, and prevent sand from running out during the filter process. The specific composition of the supporting layer 2 25 is not limited thereto, and any other conventional supporting layer arrangement in the art can be adopted on the basis of achieving the aforementioned purpose. An aeration system 2 is set at the lower part of the support layer, and the aeration system 2 is externally connected to an oxygen supply blower, and the oxygen supply blower supplies air to the aeration system 2 for backwashing and air distribution. The second aeration system consists of an aeration component 214 and an auxiliary aeration pipe 215 connected to one end of the aeration component 214 , and an auxiliary aeration valve 216 is provided on the air inlet end of the auxiliary aeration pipe 215 . The aeration component 2 214 is composed of a special aeration head, an aeration branch pipe and a support. The water collection system 2 26 is composed of a filter plate and several filter heads arranged on the filter plate, and is used for evenly collecting the filtered water of the filter layer and evenly distributing the backwash water during backwashing. The second horizontal aeration and purging device 28 is horizontally arranged in the middle of the second biological filter layer 24, which can reduce the amount of backwash water and energy consumption, and ensure that the filter layer is not compacted.

The BTF reactor applies biological trickling filtration technology (BTF) to sewage treatment. Because BTF operates without aeration, the filter layer is not disturbed, and the effluent quality is good and stable. In addition, denitrification and phosphorus removal bacteria are formed in the reaction tank body. Biological communities such as nitrite and phosphorus removal bacteria have reduced demand for oxygen and carbon sources, and have good nitrogen and phosphorus removal effects. In addition, the horizontal purge cleaning device installed in the middle of the biological filter layer can reduce the amount of backwash water and energy consumption, and ensure that the filter layer is not compacted. Further, the filter material loss prevention device can prevent the filter material from being lost during the backwashing process, save fillers, and ensure water quality.

As shown in Figure 4, the multimedia filter includes a housing 31, and the housing 31 is sequentially provided with a vortex micro-flocculation reactor 32, a multimedia filter layer 33, a supporting layer 34, and a water collection system 3. 35. The upper side wall of the casing 31 is provided with a water inlet pipe 3 36, and the middle side wall is provided with a backwash drain pipe 3 37, and the backwash drain pipe 3 37 is located between the vortex micro-flocculation reactor 32 and the multimedia filter layer 33 , the side wall of the lower part is provided with a water outlet pipe three 38, and the water outlet pipe three 38 is located at the bottom of the water collection system three 35. The water outlet pipe three 38 is also provided with a backwash water inlet pipe three 39 communicated with it. The backwash blower is connected with outlet pipe 3 38 and connected in front of the control valve. It is used for air washing during backwashing. When backwashing, close the control valve and open the backwashing inlet valve to let the air enter the water collection area at the bottom of the multi-media filter, and distribute the air evenly through the filter head and the supporting layer.

In this embodiment, an emptying pipe 310 is also provided on the side wall of the lower part of the housing 31, and the emptying pipe 310 is located at the lower part of the water collection system 335, and the mouth of the backwash drain pipe 337 is connected to the emptying pipe 310 Pass. The emptying pipe 310 is used for water emptying or system washing during equipment maintenance. The emptying pipe 310 and the backwash drain pipe 3 37 are located on the same side of the housing, and the water inlet pipe 3 36 and the water outlet pipe 38 are located on the other side of the housing. The shape of the casing 31 may be cylindrical or cubic. In addition, the bottom of the casing 31 may be provided with feet according to the actual situation, and there is no special limitation on these. The vortex micro-flocculation reactor 32 can adopt various types of vortex micro-flocculation reactors well known to those skilled in the art. And the multimedia filter layer 33 can also adopt the medium filter material commonly used in this field. In the present embodiment, the multimedia filter layer 33 includes a quartz sand layer, anthracite layer, and carborundum layer arranged from top to bottom. The quartz sand The particle size of anthracite is 1-2mm, the particle size of anthracite is 1-2mm, and the particle size of corundum is 2-4mm. The multi-media filter layer with this structure has the following advantages: good and stable effluent quality, strong dirt holding capacity, high wear resistance, and certain degreasing effect. Supporting layer 3 34 includes pebble layer 5, pebble layer 6 and pebble layer 7 arranged from top to bottom, and the particle diameters of pebbles filled in pebble layer 5, pebble layer 6 and pebble layer 7 are 4-8mm and 8-16mm respectively , 16 ~ 32mm. , which is used for uniform water distribution, and supports the multi-media filter layer to prevent sand running out during the filter process. Obviously, the specific composition of the supporting layer 3 34 is not limited thereto, and any other conventional supporting layer arrangement in the art can be adopted on the basis of achieving the aforementioned purpose. The water collection system 3 35 includes a filter plate arranged under the supporting layer, and several filter heads arranged on the filter plate, which are used to evenly collect the filtered water of the filter layer and evenly distribute the backwash water during backwashing .

The multi-media filter is equipped with a vortex micro-flocculation reactor on the top of the multi-media filter layer, so that the wastewater is first subjected to the hydraulic action of the vortex micro-flocculation reactor, and the water and the flocculant added at the water inlet end undergo a micro-flocculation reaction to generate After the tiny particles enter the multi-media filter layer for filtration, the supporting layer can evenly distribute water and place sand during the filtration process, so that the quality of the effluent water is more stable, and the removal efficiency of suspended solids, bacteria and other pollutants is higher. Further, the multi-media filter is also equipped with a backwash water inlet pipe and a backwash drain pipe. When the quality of the effluent water does not meet the standard, the backwash program can be started, and the backwash water is introduced from the lower part into the shell to filter the multi-media filter. The particles in the layer rub against each other, and finally the mud-water mixture generated by backwashing is discharged out of the equipment body through the backwashing drain pipe, which strengthens the guarantee of effluent water quality. Overall, the multi-media filter provided by the present invention has a simple structure, can effectively improve the filtering effect, and is suitable for popularization and use.

The working process and principle of the urban sewage treatment system with low energy consumption provided by the present invention are further described below to further demonstrate the advantages of the present invention:

The wastewater is pretreated, and different processes are used to pretreat the water according to the composition of the wastewater, the concentration of pollutants, and the biochemical properties. The biodegradability is high, the C/N is low, and the pretreatment can be adjusted directly by grilling. The biodegradability is relatively low. When the C/N is high, grilling, conditioning and anaerobic pretreatment can be performed first.

The pretreated wastewater flows into the MO-BAF reactor by itself. The waste water enters the reaction tank body 11 by itself through the water inlet pipe 18, and first enters the water distribution system 12, and then evenly enters the submerged water area on the upper part of the biological filter layer 13 from the water distribution system 12, and completes the contact with the atmosphere during the water distribution process In the first natural reoxygenation process, the wastewater enters from top to bottom and passes through the biological filter layer-13. Under the action of the dominant microorganisms in the upper layer of the biological filter layer-13, the macromolecular organic matter (cellulose, protein, etc.) is converted into short-chain organic matter (fatty acid, polypeptide organic matter, amino acid, etc.), and then regenerated after hydrolysis and acidification. Entering the middle layer of the biological filter layer 13, under the action of the dominant microorganisms in the middle layer, the ammonia nitrogen is converted into nitrate nitrogen and nitrite nitrogen, and then partially converted into nitrogen gas. After being treated by the microorganisms in the middle layer, the wastewater enters the biological filter layer 1 In the lower layer of 13, under the action of the dominant microorganisms in the lower layer, the short-chain organic matter is further degraded into water and carbon dioxide, ammonia nitrogen is converted into nitrate nitrogen, and the treated water enters the produced water at the bottom of the reaction tank through the supporting layer and the water collection system Area.

After the equipment has been in operation for a period of time, the quality of the effluent water will gradually decline. When the water quality cannot meet the requirements, the equipment should be backwashed in time, using air-water backwashing, first air washing, and then water washing. During air washing, the backwash inlet pipe 113 is connected to the backwash fan, and the backwash fan is started. After 3 to 10 minutes of air washing, it enters the water washing process and starts the backwash pump. The backwash water enters the lower part of the water collection system in the reaction tank body 11 through the backwash inlet pipe 111, and is evenly distributed on the supporting layer 14 by the water collecting system, and then evenly distributed to the biological filtration layer through the supporting layer 14 On the section of -13, make the filter layer of cut-off biological filter layer -13 fluffy, and make the particles rub against each other, finally, the backwashed mud-water mixture will be discharged out of the reaction pool body -11 through the backwash drain pipe -19, and then backwashed and drained The anti-filter material loss device-112 at the mouth of pipe of the pipe-19 can prevent the filter material from losing, save fillers, and ensure water quality. Air/water backwashing simultaneously opens the horizontal aeration and purging device 16, which can effectively reduce backwashing water volume and air volume. Dissolved oxygen measuring instrument, used to control the dissolved oxygen in the middle layer of the reactor at 0.8~1.2mg/L. When the DO is lower than 0.8mg/L, the blower of the external aeration system 1 is automatically turned on, and when the DO is higher than 1.2mg/L, the oxygen supply blower is automatically turned off.

The water treated by MO-BAF flows into the BTF reactor by itself. The waste water flows into the reaction tank body 21 through the water inlet pipe 29, and first enters the water distribution system 222, and then evenly enters the upper part of the biological filter layer 3 from the water distribution system 222, and submerges the natural falling water reoxygenation zone 23. During the water distribution process The first natural reoxygenation process is completed in the natural falling water reoxygenation zone 23 in contact with the atmosphere, and the waste water enters through the biological filter layer 2 24 from top to bottom. Under the action of the dominant microorganisms in the upper layer of the biological filter layer 24, the organic matter (cellulose, protein, etc.) in the waste water is converted into short-chain organic matter (fatty acid, polypeptide organic matter, amino acid, etc.), and after hydrolysis and acidification chain breaking reaction Then it enters the middle/lower layer of the biological filter layer 3 in turn. Under the action of the dominant microorganisms in the middle/lower layer, ammonia nitrogen is converted into nitrate nitrogen and nitrite nitrogen, and then partially converted into nitrogen gas. The treated water passes through the supporting layer Two 25. The water collection system two 26 enters the water production catchment area 27 at the bottom of the reaction tank.

After the equipment has been in operation for a period of time, the quality of the effluent water will gradually decline. When the water quality cannot meet the requirements, the equipment should be backwashed in time, using air-water backwashing, first air washing, and then water washing. During air washing, the backwash air inlet pipe 213 is connected to the backwash fan, and the backwash fan is started. After 3 to 10 minutes of air washing, the water washing process is started, and the backwash pump is started. Close the water inlet control valve during water washing, turn on the backwash pump, and the backwash water enters the lower part of the water collection system 226 in the reaction tank body 221 through the backwash water inlet pipe 11, and is evenly distributed on the support layer 4 by the water collection system 226 Then, it is evenly distributed to the cross-section of the biological filter layer 24 through the supporting layer 25, so that the filter layer that cuts off the biological filter layer 24 is fluffy, and the particles are rubbed against each other, and finally the mud-water mixture that is backwashed is backwashed. The drain pipe 2 210 discharges out of the reaction tank body 2 21 . When backwashing, turn on the second aeration system to backwash and aerate. The anti-filter material loss device 217 at the nozzle of the backwash drain pipe 2 210 can prevent the loss of filter material, save fillers, and ensure water quality. Air/water backwashing simultaneously opens the horizontal aeration and purging device 2 28, which can effectively reduce backwashing water volume and air volume.

After being treated with BTF, it enters the multimedia filter. The waste water enters the housing 31 of the multimedia filter through the water inlet pipe 36, and first enters the vortex micro-flocculation reactor 32, and adds phosphorus removal agent in the vortex reactor, and under the hydraulic action in the vortex micro-flocculation reactor 32, the The wastewater reacts with the flocculant added at the water inlet to form tiny particles, which flow into the multi-media filter layer 33 after the micro-flocculation reaction, and remove suspended solids in the water under the action of static electricity, interception, adsorption and ion exchange of multiple media , heavy metal ions, bacterial micelles, etc. After being treated by the multi-media filter layer 33, the waste water enters the support layer 3 34. The main function of the support layer 3 34 is to distribute water evenly, support the multi-media filter layer, and prevent leakage during the filtration process. sand. The water after the support layer three 34 evenly enters the water collection system three 35, and then is discharged through the outlet pipe 38.

After the equipment has been in operation for a period of time, the water level above the multi-media filter layer 33 will gradually rise, and the quality of the effluent water will gradually decrease. When the water quality cannot meet the requirements, the equipment should be backwashed in time, and the backwash water enters the multi-media filter shell through the backwash water inlet. The lower part of the water collection system 3 35 in the body 31 is evenly distributed on the support layer 34 by the water collection system 3 35, and then evenly distributed to the section of the multimedia filter layer 33 through the support layer 34, so that the cut-off filter layer 3. The filter layer is fluffy, and the particles rub against each other, and finally the mud-water mixture that is backwashed is discharged out of the equipment body through the backwashing drain.

The water treated by multi-media flows into the clear water pool by itself, and disinfectant is added into the clear water pool. After disinfection, the effluent can meet the water quality standards of the fourth category of "Surface Water Quality Standards".

In summary, the low-energy urban sewage treatment system provided by the present invention applies micro-oxygen technology to BAF to form a unique MO-BAF reactor, reducing energy consumption and carbon source requirements, and due to the use of micro-oxygen technology and BTF technology , the aeration volume is smaller than the traditional process, and the energy consumption is low; because the BTF operation does not aerate, the filter layer is not disturbed, the effluent water quality is good and stable; the effect of nitrogen and phosphorus removal is good, because this process adopts micro-oxygen technology, in MO- In the BAF reactor, biological communities such as denitrification and phosphorus removal bacteria and nitrification phosphorus removal bacteria are formed, and the demand for oxygen and carbon sources is small; in the MO-BAF reactor and the BTF reactor, light biological carriers are used to prevent blockage; The anti-clogging device of filter material is used to prevent the loss of filter material, save filler and ensure water quality.

Those skilled in the art will appreciate that the embodiments described here are to help readers understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical revelations disclosed in the present invention without departing from the essence of the present invention, and these modifications and combinations are still within the protection scope of the present invention.

Claims (8)

1. a kind of town sewage treatment system of low energy consumption, it is characterised in that：MO-BAF including being sequentially connected by pipeline is anti- Answer device, BTF reactors, more medium filter and clear water reserviors, the MO-BAF reactors, BTF reactors, more medium filter Backwashing pump and backwash blower fan are circumscribed with, MO-BAF reactors, BTF reactors are also circumscribed with oxygen supply air blower, the MO- BAF reactors are that micro- oxygen technology is applied into the sewage disposal device that is constituted in BAF.

2. the town sewage treatment system of low energy consumption according to claim 1, it is characterised in that：The MO-BAF reactors Be disposed with from top to bottom including reaction tank body one (11), in the reaction tank body one (11) water distribution system one (12), Biofiltration layer one (13), supporting layer one (14), aerating system one and collecting system one (15), the biofiltration layer one (13) middle part is provided with laterally aeration blow device one (16) and dissolved oxygen meter (17), on the side wall of reaction tank body one (11) Portion is provided with water inlet pipe one (18) and backwash drainpipe one (19), and its lower sidewall is provided with outlet pipe one (110) and backwash water inlet pipe One (111), it is additionally provided with anti-filter at the mouth of pipe of backwash drainpipe one (19) on the madial wall of the reaction tank body one (11) Stream is lost in device one (112), reaction tank body one (11) and is additionally provided with backwash air inlet pipe one (113), the backwash air inlet pipe one (113) one end is located on reaction tank body one (11), and one end is located at the place of collecting system one (15), outside the aerating system one Connect oxygen supply air blower, the external backwashing pump of the backwash water inlet pipe one (111), the external backwash wind of the backwash air inlet pipe one (113) Machine.

3. the town sewage treatment system of low energy consumption according to claim 2, it is characterised in that：The biofiltration layer one (13) by lightweight bio-carrier and the upper strata/middle level/lower floor's superior microorganism being attached to from top to bottom on lightweight bio-carrier One is constituted, and the upper strata superior microorganism one includes anoxic heterotrophic microorganism, ammonification microorganism, the middle level superior microorganism one Including nitrification and short distance nitration microorganism, lower floor's superior microorganism one includes nitrifying microorganisms and aerobic heterotrophic microorganism.

4. the town sewage treatment system of low energy consumption according to claim 1, it is characterised in that：The BTF reactors bag Include reaction tank body two (21), be disposed with from top to bottom in the reaction tank body two (21) water distribution system two (22), from So drop natural reaeration region (23), biofiltration layer two (24), supporting layer two (25), aerating system two, collecting system two (26) and Water gathering ground (27) is produced, the middle part of biofiltration layer two (24) is provided with laterally aeration blow device two (28), reaction tank body Two (21) side wall upper part is located at the place of water distribution system two (22) and drop natural reaeration region (23) place is respectively equipped with water inlet pipe two naturally (29) and backwash drainpipe two (210), its lower sidewall is located at and produces water gathering ground (27) place and be provided with outlet pipe two (211) and backwash Backwash air inlet pipe two (213), the backwash air inlet pipe two (213) are additionally provided with water inlet pipe two (212), reaction tank body two (21) One end is located on reaction tank body two (21), and one end is located at the place of collecting system two (25), the external oxygen supply of the aerating system two Air blower, the external backwashing pump of the backwash water inlet pipe two (211), the external backwash blower fan of the backwash air inlet pipe two (213).

5. the town sewage treatment system of low energy consumption according to claim 4, it is characterised in that：The biofiltration layer two (4) by lightweight bio-carrier and the upper strata/middle level/lower floor's superior microorganism two being attached to from top to bottom on lightweight bio-carrier Constitute, the upper strata superior microorganism two includes aerobic heterotrophic microorganism and autotrophic type nitrobacteria, the middle level/lower floor's advantage Microorganism two includes nitrification and short distance nitration microorganism.

6. the town sewage treatment system of low energy consumption according to claim 1, it is characterised in that：The more medium filter Including housing (31), vortex micro flocculation reactor (32), multi-medium filtering layer are sequentially provided with the housing (31) from top to bottom (33), supporting layer three (34), collecting system three (35), housing (31) top, middle part, are respectively equipped with water inlet pipe on the side wall of bottom Three (36), backwash drainpipe three (37) and outlet pipe three (38), the backwash drainpipe three (37) are anti-positioned at vortex tiny flocculation Answer between device (32) and multi-medium filtering layer (33), the outlet pipe three (38) is positioned at the bottom of collecting system three (35), water outlet The backwash water inlet pipe three (39) for communicating therewith is additionally provided with pipe three (38), the external backwashing pump of backwash water inlet pipe three (39), waste water leads to Cross vortex micro flocculation reactor (32) top that water inlet pipe three (36) enters in housing (31), then to sequentially pass through vortex tiny flocculation anti- Device (32), multi-medium filtering layer (33), supporting layer three (34), collecting system three (35) are answered, is discharged by outlet pipe three (38), when going out When water water quality is not up to standard, backwash water into the bottom of collecting system three (35) is passed through by backwash water inlet pipe three (39), makes it successively By collecting system three (35), supporting layer three (34), multi-medium filtering layer three (33), the mud mixture warp that last backwash is produced Backwash drainpipe three (37) is discharged, and is connected with outlet pipe 3 38 before the control valve that backwash blower fan is external on outlet pipe 38.

7. the town sewage treatment system of low energy consumption according to claim 6, it is characterised in that：The multi-medium filtering layer (33) including the quartz sand layer, anthracite coal measure, the silicon carbide layer that set from top to bottom, the particle diameter of the quartz sand is 1~2mm, nothing The particle diameter of bituminous coal be 1~2mm, diamond dust particle diameter be 2~4mm.

8. according to the town sewage treatment system of any described low energy consumption of claim 1~7, it is characterised in that：The clear water Sterilizing equipment decontaminating apparatus is also equipped with pond.