JPH1142496A - Method and apparatus for purifying wastewater by microorganisms - Google Patents

Abstract

(57) [Abstract] [Objective] A method for effectively removing BOD, COD, and SS from wastewater such as industrial wastewater, domestic wastewater, sewage, and manure, and purifying the wastewater efficiently including nitrogen and phosphorus. In addition, the present invention provides a method and a device having a function of decomposing an off-flavor component to prevent generation of offensive odor and secreting antibiotics to kill lysis such as Escherichia coli. [Structure] A rotary treatment section receives a wastewater and a microorganism mainly composed of Bacillus bacteria and an activator of the microorganism, and partially immerses a crossed porous tissue rotating body 6 made of a fiber material such as a synthetic resin in the wastewater. Rotate under conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for purifying organic wastewater by microorganisms, and to effectively remove BOD, COD and SS from wastewater and wastewater such as sewage and manure generated from various industries and homes. And also nitrogen,
Provide a method for efficiently purifying treatment including phosphorus, a method having a function of decomposing an off-flavor component to suppress the generation of offensive odor, secrete antibiotics and kill bacterium such as Escherichia coli, and their preferred devices. It is assumed that.

In the present invention, most of the microorganisms mainly composed of Bacillus are Bacillus, but one or more of the following microorganisms appear in general processing. It is recognized that you are doing. 1. 1. Opercularia (Opercularia sp.) 2. Vorticella (Vorticella spp.) 3. Kineto kilm (Cinetochilum margaritaceum) 4. Paramecium caudatum 5. Colpoda sp. 6. Colpidium colpoda Bodo (Bodo spp.) 8. Oicomonas termo Monas sp. Pleuromonas jaculans 11. Rhabdolaimus sp. 12. Philodina sp. 13. Pristina sp. 14. Zoogloea ramigera 15. Beggiatoa alba 16. Sphaerotilus sphaerotilus In the present invention, the activator of the microorganism is one or both of diatomaceous earth and magnesium sulfate, to which zeolite, sodium chloride, glucose, humus and the like are further added and mixed.

[0003]

2. Description of the Related Art Wastewater generated from various industries, domestic wastewater from households, sewage, manure, and other wastewater are discharged as they are, resulting in rivers, lakes or marine pollution, and further soil soil and other living environments. It is clear that various investigations and implementations have been made in the past in the treatment of sewage wastewater as described above in institutions such as facilities and local governments. In other words, purification of wastewater is based on the separation and removal of contaminants or pollutants, and such separation and removal methods generally employ physical treatment such as filtration and precipitation. When it is difficult, fine particles or components are agglomerated using a chemical agent or the like, and further, they are combined.

In the purification of wastewater as described above, a method of removing pollutants represented by an activated sludge method (or an activated sludge method) utilizing the action of microorganisms is generally proposed separately from these methods. In addition, the method using such a microorganism has an advantage that effective separation can be achieved even under conditions that are difficult to remove physically or chemically.
In addition, it has the characteristic that the cost is relatively low because no special chemical is required.

[0005]

Although the above-mentioned conventional methods have their respective advantages,
On the other hand, it has its own problems. In other words, the physical separation and removal method requires a special filter medium and a filtration layer, and requires considerable man-hours and costs for the preparation, production and replacement thereof, and has the disadvantage that it cannot separate dissolved components and liquid components. is there. In addition, the coagulation separation method using chemicals, etc., requires a cost for the chemicals, and in each case, it is necessary to prepare various chemicals, which makes the operation complicated and requires special techniques. And

The method of removing contaminants using the action of microorganisms can be said to be a method of appropriately covering the disadvantages described above. However, microorganisms are generally classified into aerobic bacteria and anaerobic bacteria. Aerobic bacteria grow and grow under aerobic conditions,
Under anaerobic conditions, it is common to die before long, and anaerobic bacteria grow and proliferate under anaerobic conditions, on the other hand, become aerobic or become aerobic and become quiescent, and then die. Is common. However, under the conditions of their growth and growth these organic or nitrogenous substances,
Although phosphorus is absorbed as a nutrient, the absorption of such nutrients is stopped in a growth halt state, so that in the wastewater treatment using microorganisms as described above, organic matter is removed, but nitrogen and phosphorus remain untreated. It is often impossible to achieve a general and effective processing purpose.

That is, in general wastewater, BOD, C
It is common that nitrogen and phosphoric acid are mixed with organic matter such as OD, and in order to treat such wastewater, special treatment facilities that have formed aerobic and anaerobic conditions are required. Therefore, it is necessary to perform separate processing in each of these facilities, which is disadvantageous both in terms of equipment and time, the processing operation becomes complicated, and the processing equipment becomes large. Time is at least 24
It takes more than an hour, typically a few days or more, and all of the costs, such as equipment costs and operating costs, have to be considerable.

The above B, which is further removed using aerobic conditions
Regarding the removal of OD, COD or SS, such equipment generally has to be large-sized, that is, large equipment that can accommodate at least tens of tons of wastewater, generally more than 100 tons. However, it is necessary to prepare from a considerably large site in terms of the configuration of water supply and drainage for tanks and tanks and their equipment, and because of the occurrence of a certain offensive odor, it is necessary to install equipment in factories and residential areas. Therefore, it is indispensable to use a vehicle for transporting wastewater to a treatment facility provided in a remote place, and the time required for the treatment is as long as 2-3 days to 10 days or more. It has disadvantages such as a period.

[0009]

SUMMARY OF THE INVENTION The present invention has been studied to solve the disadvantages and disadvantages of the prior art as described above, and by changing the amount of air under aerobic conditions in a relatively small processing apparatus. General content of impurities in wastewater (BOD, COD, SS, N-hex,
The present invention has succeeded in obtaining a method and an apparatus capable of properly treating nitrogen, phosphorus, and malodor by a microorganism, and is as follows.

(1) Sewage wastewater and microorganisms mainly composed of Bacillus bacteria and an activator of the microorganisms are received in a rotation processing section, and a cross-linked porous tissue rotating body made of a fiber material such as synthetic resin is partially immersed in the wastewater. A method for purifying wastewater by using microorganisms, the method comprising rotating the wastewater under rotating conditions.

(2) Rotating a porous tissue rotator in a cross fiber structure state and adding a microorganism mainly composed of Bacillus bacterium and an activator thereof to a plurality of rotation processing sections adapted to sequentially receive wastewater. The wastewater was introduced sequentially,
A method for purifying wastewater with microorganisms, comprising introducing air into the wastewater by rotating the above-described porous tissue rotating body, and dispersing and developing the wastewater in the air for treatment.

(3) A plurality of rotation processing sections are closed to rotate the porous tissue rotating body, and the air supply to the plurality of rotation processing sections is partially made excessive and the remaining air supply is restricted. The method for purifying wastewater by microorganisms according to the above item (2), wherein the treatment is performed by changing the treatment.

(4) The method according to any one of the above (1) to (3), wherein the aeration processing by the plurality of aeration units is continuously performed after the processing by the plurality of rotation processing units. The wastewater purification treatment method described in the above.

(5) Partially immersed in the wastewater is a crossed porous tissue rotator made of a fiber material such as synthetic fiber in a rotary treatment chamber adapted to receive microorganisms mainly composed of sewage and Bacillus bacteria and an activator of the microorganisms. An apparatus for purifying wastewater with microorganisms, characterized in that the apparatus is rotated.

(6) A plurality of rotation processing chambers and a plurality of aeration processing chambers, wherein the rotation processing chamber is provided with a porous tissue rotating body in a state of a cross-fiber structure and drives the porous tissue rotating bodies. Wastewater from microorganisms, characterized in that the rotation processing chamber and the aeration chamber are each provided with a hermetic lid and air supply means are provided to change the amount of air supplied to each of the chambers. Purification equipment.

(7) A sedimentation tank is connected to the end aeration chamber of the wastewater purification treatment apparatus comprising the rotary treatment chamber and the aeration chamber described in (6) above, and a separation mechanism formed in the sedimentation tank is suctioned. An apparatus for purifying wastewater by microorganisms, comprising a raising means, and leading a supply pipe from the suction means to one or both of the rotary processing chamber and the aeration chamber.

(8) A microorganism tank is provided in the raw water tank via a liquid amount adjusting tank and a metering / distribution tank, and a plurality of rotary processing chambers are sequentially connected to the microorganism tank via the metering / distribution tank. An apparatus for purifying wastewater with microorganisms according to any one of the above (5) to (7).

[0018]

DETAILED DESCRIPTION OF THE INVENTION The present invention as described above will be described in detail. The present inventors predominate Bacillus bacteria for the purpose of treating wastewater as described above (that is, until Bacillus is not completely monopolized). (Growth in a dominant state), it was confirmed that a favorable treatment result was obtained, and it was possible to achieve such a dominance accurately and to smoothly and easily realize wastewater treatment.

That is, Bacillus is a bacillus in the form of a single rod, and is a gram-positive suitable bacterium capable of forming spores in an adverse environment, and is produced by the standard activated sludge method, which is a standard system for treating organic wastewater as described above. The microorganisms are also contained in a group of microorganisms, and by dominantly culturing them, exhibit the following effective characteristics. (1) Decompose meat pieces, proteins, starches, fats, etc., assimilate,
Multiply. In particular, there are few bacteria that degrade proteins, and it is very useful to treat various wastewaters by performing various decomposition, assimilation, and proliferation as described above. (2) Decomposes off-flavor components. That is, it effectively decomposes ammonia, hydrogen sulfide, amines, etc., and suppresses odor generation. (3) Spore-forming ability, when processing progresses and nutrients are reduced, spores are formed in cells, and these spores are resistant to adverse conditions, and the number of bacteria that proliferated without dying Is held. If vegetative cells remain like other bacteria, the bacteria will die under adverse conditions, but Bacillus bacteria will not die due to such sporulation. (4) Bacillus bacterium is proliferated by supplementing silicic acid and magnesium, and spore formation is improved. (5) Bacillus bacteria, when bacteria with different biochemical properties coexist, complement each other and grow vigorously, and secrete antibiotics during the strong enzyme and sporulation stages, killing lysis such as Escherichia coli. . (6) Due to the above-mentioned properties, it is possible to prioritize a high bacterial cell concentration, and a dominance of, for example, 10 ⁹ to 10 ¹⁰ cells / ml can be achieved. (7) The cell wall of Bacillus is adsorbable and covered with an adhesive substance, so it is easily adsorbed and aggregated. (8) Furthermore, Bacillus bacteria, as found in natto, form filaments under high nutrient conditions and do not readily disintegrate.

Although it has been confirmed that Bacillus has very effective properties as described above, under the operating conditions of a general organic wastewater treatment system, other Bacillus such as Opercularia sp. ), The activity of bacteria such as Vorticella is predominant, the concentration of Bacillus is low, and the growth characteristics of Bacillus even when operating conditions are changed, such as aeration method to promote the growth of Bacillus. Therefore, dominant culture is not easy, and it is difficult to maintain this at a high concentration in a general wastewater treatment system. Bacillus bacteria grow rapidly while forming filamentous bodies when a good environment for growth is created,
As described above, in a disadvantaged environment, spores are formed and go into a dormant state, which shows many differences from general aerobic microorganisms. It is preferable to use a growth promoter for promoting the growth of Bacillus bacteria.

Further, in order to promote the growth of Bacillus bacterium and maintain a high concentration as described above to achieve an effective treatment purpose,
In the present invention, vinylidene chloride or other synthetic fibers or pig hair, horse hair, etc. are curled and bulky and irregularly arranged, and at least the intersection between the fibers is strongly strengthened with vinylidene chloride or other adhesive. By using the adhered curled fiber tissue body and operating conditions that alternately locate it in wastewater and air by rotating it, vigorous dominant cultivation of Bacillus bacteria and the accompanying Reasonably achieve wastewater treatment.

That is, the above-described curled fiber structure using a vinylidene chloride fiber or the like typically has the following characteristics. Because of the special mesh structure having a very large contact portion, the contact portion with wastewater and air is large, and a high treatment effect can be obtained. As it is lightweight and does not absorb water (bulk specific gravity 0.0
4 ~ 0.08g / cm ³ ) The cost of electricity and maintenance of the drive motor are low. Since the porosity is as large as, for example, 97% or more, the inflow and outflow of wastewater and air into and from the contact body are easy, and the treatment effect is extremely good. Since there is almost no water absorption or moisture absorption as described above, there is no change in weight when immersed in wastewater, and there is no problem of mold and corrosion. Excellent weather resistance, chemical resistance, and solvent resistance, and high mechanical strength. As described above, the contact body having a three-dimensional network structure having a large voidage can hold many microorganisms such as Bacillus bacteria, is resistant to load fluctuation, and can obtain a high removal effect. Also, since many microbial groups (mainly Bacillus bacteria) inhabit in such a network structure, low-cost driving operation can be performed even if the rotation speed is increased to increase the efficiency of absorbing oxygen in the air. it can. Because of the three-dimensional network structure as described above, a large amount of Bacillus bacteria can be retained, and it is possible to cope with high-concentration wastewater such as 10,000 to 30,000 ppm without dilution. As described above, since Bacillus is mainly used, the amount of excess sludge generated is small due to the characteristics of Bacillus, and a great effect on nitrification and denitrification can be obtained.

A typical equipment proposed by the present inventors as a preferred treatment apparatus for purifying wastewater by dominating Bacillus bacteria according to the present invention as described above is shown in FIG.
Alternatively, as shown in FIG. 7, the treatment mechanism 2 in which the wastewater to be treated is quantitatively fed by a connecting pipe for feeding the wastewater which has been appropriately treated is a wastewater. The rotating body 6 is mounted on the rotating shaft 23, that is, the rotating body 6, that is, the rotating body 6, which is supported by bearings 25 provided on both sides in the axial direction of the receiving portion 22 and driven by the driving mechanism 24. The body 6 has a large number of at least 10 to 30 pieces mounted on the rotating shaft 23 in a stacked manner, and a flange 27a as shown in FIG. A spacer 27 having a shaft portion 27b is provided, and the shaft portion 27b is hollow, and the connecting shaft is inserted and fixed, and the rotating body 6, which is a synthetic fiber structure having a three-dimensional network structure, is assembled while maintaining a predetermined interval. Close, at least 1 in this state
Zero, generally 20 or more rotating bodies 6 are integrally rotated.

By the rotation of the group of rotating bodies 6 at an appropriate speed as described above, the fiber structure forming each rotating body 6 with respect to the wastewater stored in the lower part of each processing mechanism 2 and the air layer above it. They are sequentially and alternately brought into contact with each other, and a liquid component (sewage water) and air for the fibrous tissue are alternately supplied in an appropriate state. An inspection window 25 is provided on the cover 21 as appropriate.
Is provided so that the operating state inside can be checked.

As described above, the rotating members 6 are formed by gathering, in an irregularly mixed state, appropriately bent synthetic fiber materials having a certain rigidity such as vinylidene chloride, and spraying the vinylidene chloride-based contact agent. Spreading is applied according to the method, and the fibers are integrated by collective coagulation of the adhesive at the intersections of the fibers, and the bulk specific gravity is 0.04 g /
cm ³ ~0.08g / cm ³ with a porosity of 90% or more, in particular 93
By setting the content to about 98.5%, it becomes easy for the wastewater and the air to enter and leave the void tissue during rotation as described above, and the growth of microorganisms mainly Bacillus is vigorously obtained, thereby obtaining a favorable treatment effect.

As described above, the rotating body 6 made of a synthetic fiber material having a low bulk specific gravity and a high porosity requires only a small driving force for rotational driving even if it is a large body having a diameter of about 2 m, for example. And moreover, the contact area with the wastewater is large and air and wastewater into and from the tissue smoothly enter and exit, and the preferred propagation of the bacteria such as Bacillus bacillus is attempted, and after such vigorous propagation is achieved, By appropriately controlling the amount of supply air in the multi-stage treatment as described above, various changes from aerobic conditions to quasi-anaerobic conditions or conditions close thereto can be given. It will be performed appropriately, and an action that cannot be obtained in the prior art will be obtained, and the processing effect will be sufficiently improved.

As a result of appropriately obtaining the above-mentioned effects, it is possible to treat the wastewater BOD without diluting up to about 20,000 ppm, decompose odor components and remove malodor, stabilize the compaction of sludge flocs, Improvement of sludge sedimentation in the settling tank, realization of high-efficiency dehydration by a dehydrator, reduction of excess sludge, appropriate resistance to temperature changes, activation of microorganisms,
Many excellent effects such as bactericidal action against Escherichia coli and the like are confirmed.

Further, in the present invention, the above-described mechanism of FIGS. 6 and 7 is employed in combination, and a general wastewater treatment facility suitable for being applied to various mass-produced various food and other manufacturing factories. An example of the structural relationship is as shown in FIG. 1, and the configuration of each part is separately as shown in FIGS. 2 to 5, wherein microorganisms are supplied to a raw water tank 10 via a liquid amount adjusting tank 11 and a measuring and distributing tank 12. A tank 13, a relay tank 14 also connected to the microorganism tank 13 via the metering / distribution tank 12,
The dispensing / distributing tank 12 has a rotary processing mechanism tank 2, 2, 2, 2
The aeration tanks 3, 3, 3, and 3 are connected via the hopper. The branch pipes 15a and 15b from the supply pipe 15 of the Bacillus sludge concentrated and separated in the settling tank 4 connected to the aeration tanks 3 are rotated. , The activated Bacillus bacterium solution which is connected to each supply side of the mechanism 2, the aeration tank 3, the microorganism tank 13, the sludge storage tank 5, and the like.

Further, as described above, the supply pipe 15 drawn from the mortar-shaped bacillus sludge collecting section 4a formed at the center bottom of the settling tank 4 is branched on the way as described above to form the aeration tank 3 group. The discharge pit 7 is connected to the settling tank 4 so as to be discharged appropriately, and the connection is quantitatively led out from the metering tank 12 provided on the relay tank 14. The pipe 16 is sequentially led to a plurality of rotation processing mechanisms 2 provided with a rotating body 6 made of a porous structure, and then to the aeration tank 3 provided by a connecting pipe 19.

The liquid that has been subjected to the treatment in the three groups of aeration tanks is guided to a precipitation tank 4 and subjected to a precipitation treatment. The supernatant liquid is guided to a discharge pit 7 and discharged. The air supply pipes 17 and 18 from the blower 9 are respectively guided to the mechanism 2 group and the aeration tank 3 group to feed air into each mechanism 2 and the tank 3. The air volume is such that the first tank on the inlet side by the connecting pipes 15 and 16 is at least half of the total air flow rate by the air feeding pipes 17 and 18, and at least two other tanks, generally three tanks or The remaining air supply amount is divided and supplied to the plurality of tanks 3 or the plurality of mechanisms 2 which are larger than that, that is, sufficient air is supplied to the tank 3 or 2 of the first tank on the introduction side, and the remaining tank 3 or the mechanism is supplied. In step 2, control means such as valves are operated and adjusted appropriately so that the air supply is limited. Supply Te.

According to the results of practically operating the above-described apparatus according to the present invention mainly using the Bacillus bacterium described above, air supply to each aeration tank 3 or each rotation processing mechanism 2 provided as described above is performed. As a more preferable state of the distribution relationship of the amount, when four to six aeration tanks 6 and the rotation processing mechanism 2 are used as illustrated, the first tank 3 or the first mechanism on the introduction side as described above. 2 is 60% or more, preferably 70% or more of the pre-supply amount, and it is appropriate that the remaining amount is set to 40% or less in each of the 6 tank groups or the 8 mechanism groups.

In the above-described illustration,
The raw water tank 10 is divided into two tanks, and a screen 20 is provided between the first tank and the second tank.
After being transferred to the tank, it is sent to the flow rate adjusting tank 11, and the raw water quantitatively measured in each of the measuring and distributing tanks 12 is sent to the microorganism tank 13 or the rotation processing mechanism 2.

A specific operation example of the above-described apparatus according to the present invention will be described. The mechanism shown in FIGS. 6 and 7 is used alone for the purpose of purifying wastewater generated from food production facilities and the like. Can be. That is, the mechanism shown in FIGS. 6 and 7 has ten or more rotating bodies 6, generally two or more.
Zero or more or more sheets are arranged as shown in FIG. 6, and the lower half of the rotating body 2 is rotated in a state of being immersed in the waste water, so that the rotating body 2 is conventionally used. It has been confirmed that an effect of removing and cleaning BOD, COD, SS, etc., which is 20 times or more as compared with the purification treatment according to the activated sludge method or the like, that is, about 250 tons in a conventional apparatus by the activated sludge method. It is known that the purification effect obtained by the treatment tank equipment can be sufficiently achieved with equipment having a capacity of about 4 tons of wastewater in which 20 rotating bodies 6 each having a diameter of 2 m are arranged in rows.

As a result of appropriately obtaining the above-mentioned effects, it is possible to treat the wastewater BOD without diluting up to about 20,000 ppm, decompose odor components and remove odors, stabilize the compaction of sludge flocs, Improvement of sludge sedimentation in settling tank, realization of high-efficiency dewatering by dehydrator, reduction of surplus sludge, appropriate endurance to temperature change, many excellent effects such as microbial activation and sterilization of E. coli etc. have been confirmed. Is done.

That is, as an example of an operation operation using the mechanism alone as shown in FIGS. 6 and 7, raw water BOD ₅ obtained from a residential groundwater treatment plant is 160 mg / l, and COD _MN is 105 mg / l.
l, SS is 278 mg / l, TN is 33 mg / l, TP
Introduced 13 mg / l of raw water, and Bacillus sludge 51
kg and 3 kg of magnesium sulfate, porosity of 96.3% by vinylidene chloride fiber, bulk specific gravity for 6 to 8 hours
With a loosened fastening condition of 0.058 g / cm ³ and a diameter of 2.0 m
A group of 24 rotating disk units 6 arranged in a row was rotated at a speed of 4 times / min, and processed together with the subsequent aeration tank. The results were 97 to 97 for BOD, COD and SS.
It was confirmed that the removal treatment could be performed with a high efficiency of 98.5%.

Explaining the case of night soil purification, raw water BOD ₅ obtained from night soil treatment plant is 11,000 mg / l,
COD _MN 7990 mg / l, TN 3800 mg / l,
Raw water with TP of 550 mg / l was introduced, and Bacillus bacteria 40
After adding 0 kg and 20 kg of magnesium sulfate, the loosened state was adjusted to a porosity of 96.3% and a bulk specific gravity of 0.058 g / cm ³ by vinylidene chloride fiber over a period of 6 to 8 hours.
A group of 6 rotating discs, each having 24 rotating discs, each having a length of 0 m, was rotated at a speed of 4 times / min, and processed together with the aeration tank at the subsequent stage. The results were BOD, COD, TN, T It was confirmed that -P could be removed with a high efficiency of 97 to 98.5%.

Another example of a concrete food production plant which is operated and operated by using the apparatus of the present invention as shown in FIGS. 1 to 5 will be described separately. The BOD of raw water generated and discharged on the 1st, 2nd and 3rd day as a juice manufacturing plant is 32
8 to 502 mg / l, COD 1325 to 1777 mg / l
1 and SS are 233 to 720 mg / l, nitrogen (TN) is 69 to 80 mg / l, and phosphorus (TP) is 19
A ~26mg / l, factory waste water is about a daily amount of 2500m ³
Under the front and rear conditions, as shown in FIG. 6, 4 m ³ of the raw water was accommodated below the rotating shaft 23, and 4000 denier synthetic fiber of vinylidene chloride was used, and this was used with an adhesive of vinylidene chloride. 6 and 7 were used in an irregularly loosened state having a porosity of 95.7% and a bulk specific gravity of 0.06 g / cm ³ , as shown in FIGS. The rotating body 6 formed into a disk shape of
The work performed by the rotation processing mechanism tanks 2, 2, 2, 2 and the aeration tanks 3, 3, 3, 3 as shown in FIG. Performed over 3 days.

As a comparative example, the conventional activated sludge method was employed for the first to third days, respectively, and the results obtained by treating wastewater from the same milk juice production plant as described above were used as the results of the present invention. Table 1 shows a comparison with the case of the embodiment of the present invention.
And 98-99% in COD and SS, which have a relatively high efficiency.
And T-P, respectively, showed a significant improvement, and it was confirmed that the activated sludge method was sufficiently increased to 74 to 98% compared to 51 to 75%. Regarding the treatment time, the activated sludge method requires 24 hours or more, while the treatment time according to the present invention is 6 to 8 hours, and is 1/3.
The above results were obtained by the following sufficiently shortened processing.

[0039]

[Table 1]

Also, separately from the above, in a newly developed sewage treatment plant in an urban area, a daily amount of about 40,000 m ³ , from late autumn to the end of January of the following year, within a period of about 15 to 50 in a three month period
Table 2 below shows the results of the activated sludge method and the method of the present invention carried out on wastewater for four days between the first to fourth days at intervals of days.

[0041]

[Table 2]

That is, also in this case, BOD, CO
With respect to D and SS, the method according to the present invention can provide at least a result equal to or higher than that of the activated sludge method, and nitrogen and phosphorus are 40.50% compared to 15.6 to 57.1% of the activated sludge method. It was confirmed that a greatly improved efficiency of 2 to 92.5% was obtained. The treatment time is 6 to 8 hours for the method according to the present invention, compared to about 24 hours for the activated sludge method, and the site area for installing the facilities is about 635 m ² for the biological treatment part of the activated sludge method. In contrast, about 121 m ² was sufficient for the method according to the present invention.

According to the present invention as described above, the rotation processing section receives a wastewater, a microorganism mainly composed of Bacillus bacteria and an activator of the microorganism, and forms a crossed porous tissue rotating body made of a fiber material such as synthetic resin. BOD, COD, SS by rotating under the condition of partial immersion in wastewater
Such a component can be removed with several tens of times higher efficiency than the conventional activated sludge method, and preferable wastewater purification treatment can be performed by compact equipment.

The porous tissue rotating body in a cross-fiber structure state is rotated in a plurality of rotating processing sections adapted to sequentially receive the wastewater, and the microorganisms mainly composed of Bacillus bacteria and an activator thereof are added thereto. The wastewater is sequentially introduced, the air is introduced into the wastewater by the rotation of the porous tissue rotating body described above, and the highly efficient purification treatment as described above is considerably performed by dispersing and developing the wastewater in the air. It can be effectively applied to a large amount of wastewater generation equipment.

A plurality of rotation processing sections rotate the porous tissue rotating body in a closed state, and further, the air supply to the second or lower rotation processing chamber among the plurality of rotation processing chambers is changed to a limited state to perform processing. By doing BOD,
A purification process capable of effectively removing nitrogen, phosphoric acid, and the like together with COD and SS is enabled.

By performing aeration treatment in a plurality of aeration chambers after the treatment by the plurality of rotation processing units, the efficiency of removal and cleaning of each component is enhanced while ensuring high efficiency of the treatment.

Rotating a rotating porous body made of synthetic fiber or other fibrous material is partially immersed in the wastewater in a rotary treatment chamber that receives the wastewater, microorganisms mainly composed of Bacillus, and an activator of the microorganism. The contact between the wastewater and the air is sufficiently increased, and the action of microorganisms mainly composed of Bacillus bacteria to digest and absorb the components contained in the wastewater is smoothed.

The rotary processing chamber includes a plurality of rotary processing chambers and a plurality of aeration processing chambers. The rotary processing chamber is provided with a porous tissue rotating body in a state of a cross fiber structure, and a drive for driving the porous tissue rotating bodies. Means, the rotation processing chamber and the aeration chamber are each provided with a closed lid and provided with an air supply means, and the amount of air supplied to each of the chambers is limited at a later stage, so that a plurality of rotation processing chambers and In the first stage of the aeration treatment room, the microorganisms are sufficiently grown under aerobic conditions, and in the second stage, a quasi-anaerobic state is formed to effectively digest the nitrogen and phosphoric acid components by the microorganisms, thereby purifying any of them. Obtained processing results.

A sedimentation tank is connected to the rear end aeration chamber in the wastewater purification treatment apparatus comprising the rotary treatment chamber and the aeration chamber as described above, and a separating means formed in the sedimentation tank is provided with suction means, By feeding the supply line from the suction means to the front end of one or both of the rotary processing chamber and the aeration chamber, the microbial sludge obtained after the completion of the purification process is converted into the rotary processing chamber or It is supplied and added to the front end side in one or both of the aeration chambers, so that the continuous purification treatment using microorganisms can be smoothly performed.

An appropriate amount of raw water can be obtained by providing a microorganism tank via a liquid amount adjusting tank and a metering / distributing tank in the raw water tank, and connecting a plurality of rotary processing chambers to the microorganism tank via the metering / distributing tank sequentially. Are sequentially supplied to the rotation processing chamber, and a smooth and appropriate purification process is effectively achieved.

[0051]

According to the present invention as described above, the processing efficiency of BOD, COD and SS can be appropriately increased, and the efficiency of nitrogen and phosphoric acid, which cannot be obtained by the conventional method, can be greatly increased. In addition, it is possible to shorten the treatment time sufficiently, and further to achieve compactness of the treatment equipment. In any case, various wastewater and sewage generated from various industries and homes, etc. This is an invention which is industrially highly effective because it can efficiently purify the BOD, COD, SS components and the contaminant components such as nitrogen and phosphorus components in manure and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a general configuration relationship of a device according to the present invention.

FIG. 2 is an explanatory diagram showing an enlarged front part in FIG. 1;

FIG. 3 is an explanatory diagram showing an enlarged rear part in FIG. 1;

FIG. 4 is a partial explanatory view showing an air supply state in the rotation processing mechanism.

FIG. 5 is a partial explanatory view showing an air supply state in the aeration tank group. In FIGS. 1 to 5, the cover and the like in the rotation processing mechanism are omitted.

FIG. 6 is a partially cutaway side view of an example of the rotation processing mechanism according to the present invention.

FIG. 7 is a perspective view partially showing a state in which the rotating body is provided.

[Explanation of symbols]

 2 Rotation treatment mechanism tank 3 Aeration tank 4 Sedimentation tank 5 Sludge storage tank 6 Rotating body 7 Discharge pit 9 Blower 10 Raw water tank 11 Flow control tank 12 Metering / distribution tank 13 Microbial tank 14 Relay tank 15 Connecting pipe 15a, 15b Branch pipe 16 Connection pipe 17 Air supply pipe for aeration tank 18 Air supply pipe for rotation processing mechanism tank 19 Connection pipe from rotation processing mechanism 20 Screen 21 Cover 22 Wastewater receiving section 23 Rotary shaft 24 Drive mechanism 25 Bearing section 26 Connection pipe 27 Spacer

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI (C12N 1/20 C12R 1:07)

Claims (8)

[Claims] 1. A rotary treatment section receives a wastewater and a microorganism mainly composed of Bacillus bacteria and an activator of the microorganism, and partially immerses a cross-linked porous tissue rotating body made of a fiber material such as a synthetic resin in the wastewater. A method for purifying wastewater by using microorganisms, the method comprising rotating under a condition. 2. A method according to claim 1, further comprising: rotating a porous tissue rotating body in a cross-fiber structure state, and adding microorganisms mainly composed of Bacillus bacteria and an activator thereof to a plurality of rotating processing units configured to sequentially receive the wastewater. Purification treatment of wastewater by microorganisms, wherein the wastewater is sequentially introduced, air is introduced into the wastewater by rotation of the porous tissue rotating body, and the wastewater is dispersed and developed in the air. Method. 3. Rotating the porous tissue rotator with a plurality of rotation processing units in a closed state, and changing the air supply amount to the plurality of rotation processing units to an excess state in a part and to a restricted state in the remaining part. 3. The method for purifying wastewater by microorganisms according to claim 2, wherein the wastewater is treated. 4. The wastewater purification treatment according to claim 1, wherein the aeration treatment by the plurality of aeration units is continuously performed after the treatment by the plurality of rotation treatment units. Method. 5. A mixed porous tissue rotating body made of a fibrous material such as synthetic fiber is partially immersed in said wastewater in a rotary treatment chamber adapted to receive microorganisms mainly composed of wastewater and Bacillus bacteria and an activator of said microorganism. A wastewater purification treatment device using microorganisms, characterized in that it is rotated. 6. A rotary processing chamber comprising a plurality of rotary processing chambers and a plurality of aeration processing chambers, wherein the rotary processing chamber is provided with a porous tissue rotating body in a state of a cross-fiber structure and for driving the porous tissue rotating bodies. The rotation processing chamber and the aeration chamber are each provided with a sealed lid and provided with air supply means, and the amount of air supplied to each of the chambers is changed. Purification processing equipment. 7. A sedimentation tank connected to an end aeration chamber in a wastewater purification treatment apparatus comprising a rotary treatment chamber and an aeration chamber according to claim 6, wherein suction means is provided to a separation mechanism formed in the sedimentation tank. Wherein the supply pipe from the suction means is guided to one or both of the rotary processing chamber and the aeration chamber. 8. A microorganism tank is provided in a raw water tank via a liquid amount adjusting tank and a metering / dispensing tank, and a plurality of rotary processing chambers are connected to the microorganism tank in sequence via the metering / distributing tank. An apparatus for purifying wastewater with microorganisms according to any one of claims 5 to 7.