CN106830562A - A kind of petrochemical industry wastewater treatment integrated technique system and method - Google Patents

Abstract

The present invention provides an integrated process system and method for petrochemical industrial wastewater treatment. The system includes an online monitoring and analysis system, an intelligent feedback control system, and a wastewater treatment system; the online monitoring and analysis system is used to analyze the water quality components of petrochemical industrial wastewater Monitor and analyze the water quality components of the effluent from each treatment link, and transmit the monitoring and analysis data to the intelligent feedback control system; the intelligent feedback control system outputs control signals to the wastewater treatment system after processing the monitoring and analysis data; The wastewater treatment system includes a pretreatment module, an oil removal module, a biochemical module, a sludge treatment module and an advanced treatment module; the pretreatment module, an oil removal module, a biochemical module, an advanced treatment module and a sludge treatment module are The control signal output by the control system commands the petrochemical industrial wastewater to be treated. The method obtains the treated water whose indicators such as SS, COD, chroma and so on reach the standard stably through seven steps.

Description

An integrated process system and method for petrochemical industrial wastewater treatment

technical field

The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to an integrated process system and method for petrochemical industrial wastewater treatment.

Background technique

Petrochemical industry is an industry that uses petroleum, natural gas, etc. as raw materials to process them into various chemical products. Petrochemical wastewater is wastewater discharged from the production process of petrochemical enterprises. The source nodes of sewage are distributed in various production devices, crude oil tank farms, water supply and drainage workshops, etc. There are many kinds of substances in petrochemical wastewater, the composition is complex, and the content of organic matter is high. The COD is about 600~1200mg/L, and the BOD is 200~1000mg/L. It is very toxic and has the property of inhibiting biodegradation, which has a serious impact on the surrounding water resources and ecological environment.

Petrochemical wastewater is a type of industrial wastewater that is difficult to treat, and has the following characteristics:

①The water quality components are complex and there are many by-products, and the reaction raw materials are mostly solvent substances or ring-structured compounds, etc.;

② High concentration of pollutants in wastewater;

③There are many toxic and harmful substances, such as halogen compounds, nitro compounds, sulfides, some surfactants or dispersants, etc.;

④ Low BOD/COD value and poor biodegradability;

⑤ High chroma of wastewater.

The traditional treatment process can solve these problems to a certain extent, but there are serious secondary pollution, large sludge output after treatment, high energy consumption, and effluent water quality that cannot meet the discharge standards. In recent years, petrochemical companies have paid more attention to the rapid development of refining and chemical integration, and gradually developed their core industries towards fine chemicals, resulting in more and more complex sewage water quality in chemical companies. It is difficult to meet environmental protection requirements only by relying on traditional treatment processes. Requirements, it is difficult to meet the national sewage treatment discharge standards.

In addition, high-concentration wastewater that inhibits biodegradation and is difficult to biodegrade is the main difficulty in wastewater treatment in petrochemical enterprises. Whether this part of wastewater can be properly treated is the key to affecting the drainage of petrochemical enterprises to meet the discharge standards. Both at home and abroad attach great importance to this, and usually use chemical or physical methods to treat it, but not all petrochemical wastewater is difficult to degrade, only a small number of special processes or products produce wastewater that is difficult to treat or biochemically. The physical method has the problem of high operating cost and poor effect. Aiming at raw water with different water quality conditions, the invention adopts a modularized intelligent identification control system, so that sewage can be selectively entered into a reasonable treatment unit, thereby reducing operating costs and improving treatment efficiency.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides an integrated process system and method for petrochemical industrial wastewater treatment, which performs process integration and parametric design treatment for various wastewater generated in the production process of petrochemical enterprises, and realizes the module of wastewater treatment process Smart, intelligent, integrated and efficient. Technical scheme of the present invention is:

An integrated process system for petrochemical industrial wastewater treatment, including an online monitoring and analysis system, an intelligent feedback control system, and a wastewater treatment system; Perform monitoring and analysis, and transmit the monitoring and analysis data to the intelligent feedback control system; the intelligent feedback control system outputs control signals to the wastewater treatment system after processing the monitoring and analysis data;

The wastewater treatment system includes a pretreatment module, an oil removal module, a biochemical module, a sludge treatment module and an advanced treatment module; the pretreatment module, an oil removal module, a biochemical module, an advanced treatment module and a sludge treatment module are The control signal output by the control system commands the treatment of petrochemical industrial wastewater;

The pretreatment module includes a swirl grit chamber and a water quality adjustment tank, the inlet of the swirl grit chamber is connected to the petrochemical industrial wastewater inlet, and the outlet is connected to the inlet of the water quality adjustment tank; the outlet of the water quality adjustment tank is connected to the biochemical module imports;

The degreasing module includes a grease trap, a high-strength fiber filter pool, a swirling air flotation pool, and an electroflocculation system. The inlet of the grease trap is connected to the petrochemical industry wastewater inlet, and the outlet is respectively connected to the high-strength fiber filter pool, the The swirl air flotation pool and the inlet of the electrocoagulation system; the high-strength fiber filter pool, the swirl air flotation pool, and the outlet of the electrocoagulation system are connected to the inlet of the biochemical module; the high-strength fiber filter pool, the cyclone The flow air floating tank and the sludge outlet of the electrocoagulation system are connected to the inlet of the sludge treatment module;

The biochemical module is divided into two parts, one part includes a hydrolysis acidification tank, the other part includes a Fenton oxidation tank, the outlet of the hydrolysis acidification tank or the Fenton oxidation tank is connected to the inlet of a high-efficiency aerobic bioreactor or a batch biofilm reactor Connection; the outlet of the high-efficiency aerobic bioreactor or the batch biofilm reactor is connected to the inlet of the advanced treatment module; the outlet of the high-efficiency aerobic bioreactor or the batch biofilm reactor sludge is connected The inlet of the sludge treatment module;

The sludge treatment module includes a sludge recovery storage tank, a thickening tank, and a plate-and-frame filter press tank connected in sequence, and the outlet of the plate-and-frame filter press tank is connected to the high-efficiency aerobic bioreactor or the intermittent biofilm Reactor inlet;

The advanced treatment module is divided into two parts, one part includes an ozone activated carbon adsorption pool, and the other part includes an ultrafiltration membrane filter pool and a reverse osmosis pool connected in sequence.

Further, the pretreatment module is also provided with an acid-base adjustment system, and the acid-base adjustment system is connected to the water quality adjustment pool.

Further, the pretreatment module is also provided with a sand washing tank, the sand inlet of the sand washing tank is connected to the swirl grit chamber, and the water outlet is connected to the water quality adjustment tank.

Further, the degreasing module is also provided with an organic polymer flocculant dosing system, and the organic polymer flocculant dosing system is connected to the cyclone air flotation tank.

Further, a three-way control valve is provided on the connecting pipeline between the hydrolysis acidification tank or the Fenton oxidation tank and the high-efficiency aerobic bioreactor or the batch biofilm reactor.

Further, the biochemical module is also provided with a bioengineering bacterial agent dosing system connected to the high-efficiency aerobic bioreactor.

An integrated process method for petrochemical industry wastewater treatment, which adopts the above-mentioned system, and includes the following steps:

Step 1, online monitoring and analysis of the concentration of petroleum substances in petrochemical industrial wastewater, when the concentration of petroleum substances is less than or equal to 50mg/L, enter step 2, otherwise enter step 3;

Step 2: start and run the pretreatment module, introduce the petrochemical industry wastewater into the cyclone grit chamber for sand deposition, monitor the pH value of the wastewater after sedimentation, and introduce the wastewater after sedimentation into the water quality adjustment tank, when the pH>8.5 or pH<6.5 , add acid or alkali to the water quality adjustment tank to adjust to 6.5≤pH≤8.5, otherwise go directly to step 4;

Step 3: start and run the degreasing module, introduce petrochemical industrial wastewater into the grease trap for initial oil-water separation, monitor the mass percentage of oil particles with a particle size of 0.1-10 μm in the wastewater after the initial oil-water separation, and when the particle size is 0.1-10 μm When the mass percentage of oil particles > 50%, the wastewater from the primary oil-water separation enters the cyclone air flotation tank for secondary oil-water separation; when the mass percentage of oil particles with a particle size of 0.1-10 μm When the mass percentage of dissolved oil with a particle size of <0.1 μm is >30%, the wastewater from the primary oil-water separation enters the electroflocculation system for secondary oil-water separation, otherwise the wastewater from the primary oil-water separation enters the high-strength fiber filter tank for secondary oil-water separation; all secondary The sludge after the primary oil-water separation enters step six, and all the waste water after the secondary oil-water separation enters step four;

Step 4: Start the biochemical module, monitor the BOD ₅ /COD value of the wastewater at the inlet of the biochemical module, introduce the wastewater with BOD ₅ /COD<0.1 into the Fenton oxidation tank for treatment, otherwise introduce the hydrolysis acidification tank for treatment, monitor the Fenton oxidation tank or hydrolysis TN concentration of wastewater at the outlet of the acidification tank;

Step five, introduce wastewater with TN concentration > 50mg/L into batch biofilm reactor, otherwise introduce high-efficiency aerobic bioreactor; sludge from batch biofilm reactor or high-efficiency aerobic bioreactor enters step six , the wastewater from the batch biofilm reactor or high-efficiency aerobic bioreactor enters step seven;

Step 6: Start the sludge treatment module, introduce the sludge into the sludge recovery storage tank, the concentration tank and the plate and frame filter tank in sequence for harmless dehydration treatment, and transport the dehydrated mud cake outside, and monitor the concentration of TN in the sludge concentrate Then repeat steps five to six;

Step 7: Start the advanced treatment module, monitor the chromaticity of the wastewater at the inlet of the advanced treatment module, and introduce the wastewater with a chromaticity > 200 and a SS concentration > 50mg/L into the ultrafiltration membrane filter pool and reverse osmosis pool for treatment, otherwise introduce ozone activated carbon Adsorption pool treatment.

In the above method, the step 2 of introducing waste water into a cyclone grit chamber for sand deposition also includes washing the separated sand, and introducing the cleaning water into a water quality adjustment tank for subsequent treatment.

In the above method, the operating parameters of the hydrolysis acidification tank in step 4 are: reaction temperature 22-25°C, hydraulic retention time 5-6h, sludge retention time 2.5-3d, COD volume load 10-16kg/(m ³ . d).

In the above method, the operating parameters of the ozone activated carbon adsorption pool in the step 7 are: the ozone passing time is 3~5min, the ozone oxygen passing rate is 120~140mg/L, the activated carbon adsorption time is 10~15min, and the carbon column diameter is 2~2.5m. The height of the carbon layer is 2.5~3.0m, the total residence time is 25~30min, and the flow ratio of ozone to wastewater from the biochemical treatment module (3.5~4.0):1.

The beneficial effects of the present invention are: the present invention can flexibly use efficient and stable treatment process combinations for the characteristics and treatment difficulties of different types of petrochemical industrial wastewater, so as to realize the optimal configuration of the treatment process, integration, intelligence and modularization The degree is high; the SS, COD, chroma and other indicators of the petrochemical industrial wastewater treated by the present invention are stable up to the standard, and the effluent can be recycled; in addition, the present invention is conducive to the mutual conversion of technology and integrated equipment, and can effectively save petrochemical industry waste. The treatment space for industrial waste water has reliable process operation and high industrial value.

Description of drawings

Fig. 1 is a kind of structural representation of petrochemical industrial wastewater treatment integrated process system of the present invention, wherein a, multi-parameter automatic water quality detection analyzer, b, PLC programmable logic controller, c, pretreatment module, e, except Oil module, d, biochemical module, g, advanced treatment module, f, sludge treatment module; 1-cyclone grit chamber, 2-water quality adjustment tank, 3-hydrolysis acidification tank, 4-Fenton oxidation tank, 5- High-efficiency aerobic bioreactor, 6-batch biofilm reactor, 7-ozone activated carbon adsorption tank, 8-ultrafiltration membrane filter UF, 9-reverse osmosis tank, 10-grease trap, 11-sand washing tank, 12-High-strength fiber filter tank, 13-Swirl air flotation tank, 14-Organic polymer flocculant speculative system, 15-Electric flocculation system, 16-Sludge recovery storage tank, 17-Concentration tank, 18-Plate and frame filter tank , 19-acid-base adjustment system, 20-biological engineering bacteria agent dosing system.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, which are explanations rather than limitations of the present invention.

The present invention provides an integrated process system for petrochemical industrial wastewater treatment. Its structure is shown in Figure 1, including an online monitoring and analysis system, an intelligent feedback control system, and a wastewater treatment system. The online monitoring and analysis system is specifically a multi-parameter fully automatic The water quality detection analyzer a is used to monitor and analyze the water quality components of the petrochemical industrial wastewater and the water quality components of the effluent from each treatment link, and transmit the monitoring and analysis data to the intelligent feedback control system; the intelligent feedback control system is specifically The PLC programmable logic controller b is used to output control signals to the wastewater treatment system after processing the monitoring and analysis data.

The wastewater treatment system includes a pretreatment module c, an oil removal module e, a biochemical module d, a sludge treatment module f, and an advanced treatment module g; the pretreatment module c, an oil removal module e, a biochemical module d, and an advanced treatment module g and the sludge treatment module f process petrochemical industrial wastewater according to the control signal instructions output by the PLC programmable logic controller b.

The pretreatment module c includes a swirl grit chamber 1 and a water quality adjustment pond 2, the inlet of the swirl grit chamber 1 is connected to the petrochemical industrial wastewater inlet, and the outlet is connected to the inlet of the water quality adjustment pond 2; the water quality adjustment pond 2 The outlet is connected to the import of the biochemical module d; the pretreatment module c is also provided with an acid-base adjustment system 19 and a sand washing tank 11, the acid-base adjustment system 19 is connected to the water quality adjustment pool 2, and the acid-base adjustment system System 19 is used to control the dosing of quicklime or sulfuric acid to adjust the pH value in the water quality adjustment tank; the sand inlet of the sand washing tank 11 is connected to the cyclone grit chamber 1, and the water outlet is connected to the water quality adjustment tank 2 .

The degreasing module e includes a grease trap 10, a high-strength fiber filter pool 12, a swirling air flotation tank 13, and an electroflocculation system 15. The inlet of the grease trap 10 is connected to the petrochemical industrial wastewater inlet, and the outlet is connected to the high-strength fiber filter respectively. The fiber filter pool 12, the swirl air flotation pool 13, and the inlet of the electrocoagulation system 15; the high-strength fiber filter pool 12, the swirl air flotation pool 13, and the electrocoagulation system 15 outlet are connected to the biochemical module d Import; the high-strength fiber filter tank 12, the swirling air flotation tank 13, and the sludge outlet of the electrocoagulation system 15 are connected to the inlet of the sludge treatment module f; the degreasing module e is also provided with organic polymer flocculation agent dosing system 14, the organic polymer flocculant dosing system 14 is connected to the cyclone air flotation tank 13, the organic polymer flocculant dosing system 14 is used to control the addition of organic polymer flocculant to the cyclone In the air flow floating pool 13.

The biochemical module d is divided into two parts, one part includes a hydrolysis acidification tank 3, and the other part includes a Fenton oxidation tank 4, and the outlet of the hydrolysis acidification tank 3 or the Fenton oxidation tank 4 is connected to a high-efficiency aerobic bioreactor 5 or intermittent Type biofilm reactor 6 inlet connection; The high-efficiency aerobic bioreactor 5 or the intermittent biofilm reactor 6 water outlet is connected to the advanced treatment module g inlet; The high-efficiency aerobic bioreactor 5 or the The sludge outlet of the batch biofilm reactor 6 is connected to the inlet of the sludge treatment module f; The connecting pipeline of the biofilm reactor 6 is provided with a three-way control valve; the biochemical module d is also provided with a bioengineering bacterial agent dosing system 20, and the bioengineering bacterial agent dosing system 20 is connected to the high-efficiency aerobic biological reaction device 5, the bioengineering bacterial agent dosing system 20 is used to control the feeding of biological bacterial agents into the high-efficiency aerobic bioreactor 5.

The sludge treatment module f includes a sludge recovery storage tank 16, a thickening tank 17 and a plate and frame filter press tank 18 connected in sequence, and the outlet of the plate and frame filter press tank 18 is connected to the high-efficiency aerobic bioreactor 5 or The 6 inlets of the batch biofilm reactor.

The advanced treatment module g is divided into two parts, one part includes an ozone activated carbon adsorption tank 7, and the other part includes an ultrafiltration membrane filter tank 8 and a reverse osmosis tank 9 connected in sequence, and the water that comes out of the reverse osmosis tank is SS, COD, chroma Qualified water with stable and up-to-standard indicators.

The present invention also provides an integrated process method for petrochemical industrial wastewater treatment, which adopts the above-mentioned system and includes the following steps:

Step 1, online monitoring and analysis of the concentration of petroleum substances in petrochemical industrial wastewater, when the concentration of petroleum substances is less than or equal to 50mg/L, enter step 2, otherwise enter step 3;

Step 2: start and run the pretreatment module, introduce the petrochemical industrial wastewater into the cyclone grit chamber for sand deposition, wash the separated sand, monitor the pH value of the wastewater after sedimentation, and transfer the wastewater and cleaning water after sedimentation After merging, it is introduced into the water quality adjustment tank. When the pH>8.5 or pH<6.5, add acid or alkali to the water quality adjustment tank to adjust to 6.5≤pH≤8.5, otherwise directly go to step 4;

Step 3: start and run the degreasing module, introduce petrochemical industrial wastewater into the grease trap for initial oil-water separation, monitor the mass percentage of oil particles with a particle size of 0.1-10 μm in the wastewater after the initial oil-water separation, and when the particle size is 0.1-10 μm When the mass percentage of oil particles > 50%, the wastewater from the primary oil-water separation enters the cyclone air flotation tank for secondary oil-water separation; when the mass percentage of oil particles with a particle size of 0.1-10 μm When the mass percentage of dissolved oil with a particle size of <0.1 μm is >30%, the wastewater from the primary oil-water separation enters the electroflocculation system for secondary oil-water separation, otherwise the wastewater from the primary oil-water separation enters the high-strength fiber filter tank for secondary oil-water separation; all secondary The sludge after the primary oil-water separation enters step six, and all the waste water after the secondary oil-water separation enters step four;

Step 4: Start the biochemical module, monitor the BOD ₅ /COD value of the wastewater at the inlet of the biochemical module, introduce the wastewater with BOD ₅ /COD<0.1 into the Fenton oxidation tank for treatment, otherwise introduce the hydrolysis acidification tank for treatment, monitor the Fenton oxidation tank or hydrolysis The TN concentration of the wastewater at the outlet of the acidification tank; the operating parameters of the hydrolysis acidification tank are: reaction temperature 22~25℃, hydraulic retention time 5~6h, sludge residence time 2.5~3d, COD volume load 10~16kg/(m ³ ．d);

Step five, introduce wastewater with TN concentration > 50mg/L into batch biofilm reactor, otherwise introduce high-efficiency aerobic bioreactor; sludge from batch biofilm reactor or high-efficiency aerobic bioreactor enters step six , the wastewater from the batch biofilm reactor or high-efficiency aerobic bioreactor enters step seven;

Step 6: Start the sludge treatment module, introduce the sludge into the sludge recovery storage tank, the concentration tank and the plate and frame filter tank in sequence for harmless dehydration treatment, and transport the dehydrated mud cake outside, and monitor the concentration of TN in the sludge concentrate Then repeat steps five to six;

Step 7: Start the advanced treatment module, monitor the chromaticity of the wastewater at the inlet of the advanced treatment module, and introduce the wastewater with a chromaticity > 200 and a SS concentration > 50mg/L into the ultrafiltration membrane filter pool and reverse osmosis pool for treatment, otherwise introduce ozone activated carbon Adsorption pool treatment; the operating parameters of the ozone activated carbon adsorption pool are: ozone passage time 3~5min, ozone oxygen flux 120~140mg/L, activated carbon adsorption time 10~15min, carbon column diameter 2~2.5m, carbon layer height 2.5 ~3.0m, the total residence time is 25~30min, the flow rate ratio of ozone to wastewater from the biochemical treatment module (3.5~4.0): 1; the SS, COD, chroma and other indicators of the treated water are stably up to standard.

The present invention performs integrated treatment on petrochemical wastewater from different water quality sources, and the treatment results are as follows:

Example 1

The wastewater quality of petrochemical plant A is as follows in Table 1:

Table 1 Wastewater quality of petrochemical plant A

Water Quality Parameters Petro COD TN Chroma (dilution factor) pH SS chloride Concentration/(mg/L) 32.6 1545.5 456.5 0.295 60 346 8.8 76 24.4

Table 2 The proportion of petroleum particle size in wastewater

grease type oil slick Disperse oil emulsified oil dissolved oil Particle size μm >100 10~100 0.1~10 <0.1 percentage% 20 10 55 15

Start the online monitoring and analysis system with a multi-parameter automatic water quality detection analyzer to monitor and analyze the petrochemical wastewater entering the system and the water quality of each control node, analyze the water quality components of the petrochemical wastewater, and select the wastewater treatment according to the composition parameters. The specific startup modules of the system are:

Monitor the concentration of petroleum substances in the petrochemical wastewater influent = 32.6≤50 mg/L, and the wastewater enters the cyclone grit chamber;

Monitor the pH of the wastewater in the water quality adjustment pool = 8.8 > 8.5, and add sulfuric acid to the acid-base adjustment system to adjust until 6.5≤pH≤8.5;

Monitor the mixed wastewater entering the biochemical module BOD ₅ /COD=0.295>0.1, the wastewater enters the hydrolysis acidification tank, the operating parameters of the hydrolysis acidification reactor: T=25°C, hydraulic retention time (HRT)=5.5h, sludge retention time ( SRT)=2.75d, COD volume load 13kg/(m ³ ﹒d);

Monitor the mixed wastewater TN concentration at the outlet of the hydrolysis acidification tank=60>50mg/L, and the wastewater enters the batch biofilm reactor;

Monitor the color of the mixed wastewater entering the advanced treatment module (dilution multiple method) = 346 > 200, and SS = 76 > 50mg/L, and the wastewater enters the ultrafiltration membrane filter pool UF and reverse osmosis RO.

Wastewater treated by the integrated process system of this embodiment, wherein the concentration of petroleum substances is 7mg/L, the concentration of COD is 35~55mg/L, the concentration of SS is 8~13mg/L, and the concentration of TN is 10~15mg/L. The degree (dilution multiple) is 10~19, and the average removal rates of petroleum, COD, SS, TN and chroma (dilution multiple) are 82~94%, 91~96%, 71~82%, 90~95% respectively and 93~98%.

Example 2

The wastewater quality of petrochemical plant B is shown in Table 3:

Table 3 Wastewater quality of petrochemical plant B

Water Quality Parameters Petro COD TN Chroma (dilution factor) pH SS chloride Concentration/(mg/L) 58.4 523.5 134.5 0.257 45 245 7.5 55 14.8

Table 4 The proportion of petroleum particle size in wastewater

grease type oil slick Disperse oil emulsified oil dissolved oil Particle size μm >100 10~100 0.1~10 <0.1 percentage% 70 10 15 5

Start the online monitoring and analysis system with a multi-parameter automatic water quality detection analyzer to monitor and analyze the petrochemical wastewater entering the system and the water quality of each control node, analyze the water quality components of the petrochemical wastewater, and according to the composition parameters, the PLC programmable logic controller selects wastewater treatment The specific startup modules of the system are:

Monitor the concentration of petroleum substances in the petrochemical wastewater influent = 58.4 > 50 mg/L, start the degreasing module, and the wastewater enters the grease trap; monitor the emulsified oil (oil particle size 0.1~10μm) in the effluent of the grease trap accounting for 15% %<50%, and dissolved oil (oil particle size<0.1μm) accounts for 5<30%, the wastewater enters the high-strength fiber filter pool;

Monitor the mixed wastewater entering the biochemical module BOD ₅ /COD=0.25>0.1, the wastewater enters the hydrolysis acidification tank, the operating parameters of the hydrolysis acidification reactor: T=25°C, hydraulic retention time (HRT)=5h, sludge retention time (SRT )=2.5d, COD volume load 10kg/(m ³ ﹒d);

Monitor the mixed wastewater TN concentration at the outlet of the hydrolysis acidification tank = 45<50mg/L, and the wastewater enters the high-efficiency aerobic bioreactor;

Monitor the color of the mixed wastewater entering the advanced treatment module (dilution multiple method) = 240 > 200, and SS > 50mg/L, and the wastewater enters the ultrafiltration membrane filter pool and reverse osmosis.

Wastewater treated by the integrated process system of this embodiment, wherein the concentration of petroleum substances is 5mg/L, the concentration of COD is 30~50mg/L, the concentration of SS is 5~10mg/L, and the concentration of TN is 5~15mg/L. The degree (dilution multiple) is 5~9, and the average removal rates of petroleum, COD, SS, TN and chroma (dilution multiple) are 80~95%, 90~95%, 75~86%, 92~99% respectively and 94~98%.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the protection scope of the present invention.

Claims (10)

1. a kind of petrochemical industry wastewater treatment integrated technique system, it is characterised in that including online monitoring analysis system, intelligence Can feedback control system, Waste Water Treatment；The on-line monitoring analysis system is used for the water quality to petrochemical industry waste water Composition and the water-quality constituents of each processing links water outlet are monitored analysis, and monitoring analyze data is sent into the intelligence Feedback control system；The Intelligence Feedback control system is described useless to being output control signals to after the monitoring analyze data treatment Water treatment system；

The Waste Water Treatment includes pretreatment module, oil removing module, biochemical module, Treatment of Sludge module and advanced treating mould Block；The pretreatment module, oil removing module, biochemical module, advanced treating module and Treatment of Sludge module are according to Intelligence Feedback control The control signal instruction of system output processed is processed petrochemical industry waste water；

The pretreatment module includes rotational flow grit chamber and water quality adjustment pond, and the rotational flow grit chamber import connects petrochemical industry work Industry waterwater entrance, outlet connection water quality adjustment pond import；The water quality adjustment pond outlet connection biochemical module import；

The oil removing module includes oil interceptor, high strength fibre filtering ponds, cyclone air-flotation pond, electric flocculation system, the oil interceptor Import connect petrochemical industry waterwater entrance, outlet connect respectively the high strength fibre filtering ponds, the cyclone air-flotation pond, The electric flocculation system inlets；The high strength fibre filtering ponds, the cyclone air-flotation pond, the electric flocculation system delivery port connect Connect the biochemical module import；The high strength fibre filtering ponds, the cyclone air-flotation pond, electric flocculation system sludge outlet Connect the Treatment of Sludge module inlet；

The biochemical module is divided into two parts, and a part includes hydrolization and acidification tank, and another part includes Fenton oxidation tank, the water Solution souring tank or Fenton oxidation tank outlet are connected with highly effective compound bacteria or batch biofilm reactor import； The highly effective compound bacteria or the batch biofilm reactor delivery port connect the advanced treating module inlet； The highly effective compound bacteria or the batch biofilm reactor sludge outlet connect the Treatment of Sludge module and enter Mouthful；

The Treatment of Sludge module includes that the sludge being sequentially connected reclaims storage pool, concentration basin and plate compression pond, the sheet frame Press filtration pond delivery port the connection highly effective compound bacteria or the batch biofilm reactor import；

The advanced treating module is divided into two parts, and a part includes ozone and activated carbon adsorption tank, and another part includes connecting successively The ultrafiltration membrance filter pond and counter-infiltration pond for connecing.

2. a kind of petrochemical industry wastewater treatment integrated technique system according to claim 1, it is characterised in that described Pretreatment module is additionally provided with acid-base accommodation system, and the acid-base accommodation system connects the water quality adjustment pond.

3. a kind of petrochemical industry wastewater treatment integrated technique system according to claim 2, it is characterised in that described Pretreatment module is additionally provided with washed-out sand pond, and washed-out sand pond sand inlet connects the rotational flow grit chamber, and delivery port connects the water quality Regulating reservoir.

4. a kind of petrochemical industry wastewater treatment integrated technique system according to claim 1, it is characterised in that described Oil removing module is additionally provided with organic polymer coargulator dosing system, and the organic polymer coargulator dosing system connects the rotation Stream flotation tank.

5. a kind of petrochemical industry wastewater treatment integrated technique system according to claim 1, it is characterised in that described Hydrolization and acidification tank or the Fenton oxidation tank and the highly effective compound bacteria or the batch biofilm reactor Connecting line is provided with three-way control valve.

6. a kind of petrochemical industry wastewater treatment integrated technique system according to claim 1, it is characterised in that described Biochemical module is additionally provided with bioengineering microbial inoculum dosing system, and the bioengineering microbial inoculum dosing system connects the high-efficiency aerobic life Thing reactor.

7. a kind of petrochemical industry wastewater treatment integrated technology process, is that, using the system described in claim 1, its feature exists In comprising the following steps：

Step one, the petroleum substance concentration of on-line monitoring analysis petrochemical industry waste water, when petroleum substance concentration≤50 Enter step 2 during mg/L, otherwise into step 3；

Petrochemical industry waste water is introduced rotational flow grit chamber desilting, after monitoring desilting by step 2, startup optimization pretreatment module PH value of waste water, and waste water after desilting is introduced into water quality adjustment pond, as pH ＞ 8.5 or pH ＜ 6.5, acid is added in water quality adjustment pond Or alkali is adjusted to 6.5≤pH≤8.5, is otherwise directly entered step 4；

Petrochemical industry waste water introducing oil interceptor is carried out first water-oil separating by step 3, startup optimization oil removing module, is monitored After first water-oil separating in waste water particle diameter in 0.1 ~ 10 μm of mass percent of oil particulates, when particle diameter is in 0.1 ~ 10 μm of oils During the mass percent ＞ 50% of grain, the waste water of first water-oil separating carries out secondary water-oil separating into cyclone air-flotation pond；Work as particle diameter The dissolving oil quality of 0.1 μm of particle diameter ＜ in 0.1 ~ 10 μm of mass percent≤50% of oil particulates and in the oil particulates During percentage ＞ 30%, the waste water of first water-oil separating carries out secondary water-oil separating into electric flocculation system, otherwise first profit point From waste water carry out secondary water-oil separating into high strength fibre filtering ponds；Body refuse after all secondary water-oil separatings enters step Six, the waste water after all secondary water-oil separatings enters step 4；

Step 4, startup optimization biochemical module, waste water BOD at monitoring biochemical module import₅/ COD value, by BOD₅/ COD ＜'s 0.1 Waste water introduces the treatment of Fenton oxidation tank, otherwise introduces hydrolization and acidification tank treatment, monitoring Fenton oxidation tank or hydrolization and acidification tank outlet Locate the TN concentration of waste water；

Step 5, batch biofilm reactor is introduced by the waste water of TN concentration ＞ 50mg/L, otherwise introduces high-efficiency aerobic biological Reactor；Enter step 6 from batch biofilm reactor or highly effective compound bacteria sludge out, from batch (-type) Biofilm reactor or highly effective compound bacteria waste water out enter step 7；

Step 6, starts Treatment of Sludge module, sludge is introduced sludge recovery storage pool, concentration basin and plate compression pond successively and is entered The innoxious dewater treatment of row, the mud cake outward transport after dehydration, five ~ step 6 of repeat step after sludge condensation liquid monitoring TN concentration；

Step 7, starts advanced treating module, the colourity of waste water at monitoring advanced treating module inlet, by colourity ＞ 200 and SS The waste water of concentration ＞ 50mg/L introduces ultrafiltration membrance filter pond and the treatment of counter-infiltration pond successively, otherwise introduces ozone and activated carbon adsorption tank Treatment.

8. a kind of petrochemical industry wastewater treatment integrated technology process according to claim 7, it is characterised in that described Step 2 by waste water introduce rotational flow grit chamber desilting, also including by after separation desilting cleaning, rinse water introduce water quality adjustment Pond carries out subsequent treatment.

9. a kind of petrochemical industry wastewater treatment integrated technology process according to claim 7, it is characterised in that described The operational factor of the hydrolization and acidification tank of step 4 is：22 ~ 25 DEG C of reaction temperature, 5 ~ 6h of hydraulic detention time, sludge retention time 2.5 ~ 3d, COD 10 ~ 16kg/ of volumetric loading (m³﹒ d).

10. a kind of petrochemical industry wastewater treatment integrated technology process according to claim 7, it is characterised in that described The operational factor of the ozone and activated carbon adsorption tank of step 7 is：Logical ozonation time 3 ~ 5min, ozone 120 ~ 140mg/L of oxygen-supply quantity, 10 ~ 15min of charcoal absorption time, charcoal post 2 ~ 2.5m of diameter, layer of charcoal height 2.5 ~ 3.0m, total residence time 25 ~ 30min are smelly The flow-rate ratio of oxygen and the waste water from biochemical treatment module out（3.5~4.0）:1.