CN110066064B - Industrial wastewater treatment system and method - Google Patents
Industrial wastewater treatment system and method Download PDFInfo
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- CN110066064B CN110066064B CN201810064422.3A CN201810064422A CN110066064B CN 110066064 B CN110066064 B CN 110066064B CN 201810064422 A CN201810064422 A CN 201810064422A CN 110066064 B CN110066064 B CN 110066064B
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- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 48
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- 239000002351 wastewater Substances 0.000 claims abstract description 64
- 238000005273 aeration Methods 0.000 claims abstract description 58
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses an industrial wastewater treatment system and method. The industrial wastewater treatment system comprises a fiber rotary disc filter, a micro-electrolysis device, a three-stage internal aeration membrane device, an ultrafiltration device and a photo Fenton device which are connected in sequence. Methods of treating wastewater using such industrial wastewater treatment systems are also disclosed. The wastewater treatment system can be used for treating industrial wastewater, can remove the influence of heavy metals on microorganisms, has low sludge yield, can freely adjust anaerobic, anoxic and aerobic states in a biochemical section, and has the advantages of low operation cost, short flow and stable treatment effect.
Description
Technical Field
The invention relates to an industrial wastewater treatment system and method.
Background
Along with the industrial development of China, a large amount of industrial sewage and domestic sewage are generated, and the pollution influence on the environment is more and more obvious. The sewage with high difficulty is discharged, such as chemical sewage, petrochemical sewage, landfill leachate, pharmaceutical sewage, electroplating sewage and the like, and contains a plurality of biological toxic substances and organic matters which are difficult to biodegrade, and the organic matters have complex components and are very difficult to treat. In recent years, china has many researches and technical developments in the field of high-difficulty sewage treatment, but the corresponding environmental protection task is still very difficult.
The traditional sewage treatment method has poor toxicity tolerance to heavy metals in industrial wastewater, large sludge yield by an activated sludge method, low oxygen utilization rate by adopting external oxygen supply by a biomembrane method, incapability of adjusting anaerobic and aerobic states of a tank body according to water quality, long process flow, poor combination flexibility and complex operation management.
At present, a sewage treatment system and a sewage treatment method which can detoxify, have low mud yield, can freely adjust biochemical sections, have low running cost, short flow and stable treatment effect are lacked.
Disclosure of Invention
The invention aims to provide an industrial wastewater treatment system and method.
The technical scheme adopted by the invention is as follows:
an industrial wastewater treatment system comprises a fiber rotary disc filter, a micro-electrolysis device, a three-stage internal aeration membrane device, an ultrafiltration device and a photo Fenton device which are connected in sequence.
In the industrial wastewater treatment system, a wastewater outlet intercepted by an ultrafiltration device is connected with a water inlet end of a micro-electrolysis device through a pipeline; the water outlet end of the three-stage inner aeration membrane device is connected with the water inlet end of the ultrafiltration device; the water outlet end of the ultrafiltration device is connected with the water inlet end of the optical Fenton device.
In the industrial wastewater treatment system, a micro-electrolysis device is filled with iron-carbon micro-electrolysis filler.
In the industrial wastewater treatment system, a three-stage internal aeration membrane device is sequentially divided into a first-stage anaerobic section, a second-stage anoxic section and a third-stage aerobic section from a water inlet end to a water outlet end, and hollow fiber membranes are arranged in each section of device.
In the industrial wastewater treatment system, a hollow fiber membrane of the three-stage internal aeration membrane device is connected with an oxygen supply fan through a pipeline.
In the industrial wastewater treatment system, a hollow fiber type ultrafiltration membrane is arranged in an ultrafiltration device.
In the industrial wastewater treatment system, an ultraviolet lamp and a hydrogen peroxide feeding device are arranged in the optical Fenton device.
An industrial wastewater treatment method, which uses the industrial wastewater treatment system to treat wastewater, comprises the following steps:
1) The wastewater enters a fiber rotary disc filter tank for pretreatment;
2) The effluent of the fiber turntable filter enters a micro-electrolysis device for electrolysis treatment;
3) The effluent of the micro-electrolysis device enters a three-stage internal aeration membrane device for biological membrane treatment;
4) The effluent of the three-stage internal aeration membrane device enters an ultrafiltration device for filtration treatment, intercepted wastewater flows back to a micro-electrolysis device for treatment, and filtered wastewater is sent to a photo-Fenton device;
5) The wastewater is degraded in the photo Fenton device, part of the degraded wastewater is returned to the three-stage internal aeration membrane device for treatment, and the wastewater treated in the photo Fenton device is discharged after reaching the standard through detection.
In the step 3) of the industrial wastewater treatment method, the aeration pressure of a first-stage anaerobic section in a three-stage internal aeration membrane device is controlled to be 0MPa to 0.01MPa; the aeration pressure of the second-stage anoxic section is controlled to be 0.01MPa to 0.04MPa; the aeration pressure of the third-stage aerobic section is controlled to be 0.04 MPa-0.06 MPa.
In the step 4) of the industrial wastewater treatment method, the aperture of an ultrafiltration membrane in an ultrafiltration device is 0.02-0.04 mu m, and the pressure difference between two sides of the membrane is 0.01-0.03 MPa.
The beneficial effects of the invention are as follows:
the wastewater treatment system can be used for treating industrial wastewater, can remove the influence of heavy metals on microorganisms, has low sludge yield, can freely adjust anaerobic, anoxic and aerobic states in a biochemical section, and has the advantages of low operation cost, short flow and stable treatment effect.
Specifically:
1) Compared with the existing sewage treatment process, the process units such as the coarse grid, the fine grid, the grit chamber, the secondary sedimentation tank and the like in the existing sewage treatment process are omitted, the treatment process is simplified, the occupied area is saved, and the management is convenient.
2) The hollow fiber membrane is used as an adhesion carrier of microorganisms, and has a special biological membrane structure. The three-stage internal aeration device can be used for freely combining anaerobic, anoxic and aerobic, and the proportion of each stage is adjusted, so that the system has great flexibility.
3) The ultrafiltration device cuts off the backflow of water to the front end of the micro-electrolysis device, and the effluent part of the photo-Fenton device flows back to the front end of the three-stage aeration film device, so that the efficiency of each process section is fully exerted, and the removal rate of pollutants is generally improved.
4) The treatment system adopts a modularized design, is produced in a factory, can be assembled at will, has the advantages of simple civil construction, short engineering construction period, simple operation control, small occupied area and no limit of the land and the land. Can be flexibly combined according to different sewage quality and water quantity.
5) The treatment system does not add a coagulating agent, has less mud production and low overall operation cost.
Drawings
FIG. 1 is a schematic diagram of a wastewater treatment system of the present invention;
fig. 2 is a schematic diagram of an embodiment of the present invention.
Detailed Description
An industrial wastewater treatment system comprises a fiber rotary disc filter, a micro-electrolysis device, a three-stage internal aeration membrane device, an ultrafiltration device and a photo Fenton device which are connected in sequence.
Preferably, in the industrial wastewater treatment system, the diameter of a fiber turntable of the fiber turntable filter tank is 2.5-3.5 m, and the aperture is 80-120 mu m; further, the fiber turntable is made of polyester fibers.
Preferably, in the industrial wastewater treatment system, a wastewater outlet intercepted by the ultrafiltration device is connected with a water inlet end of the micro-electrolysis device through a pipeline.
Preferably, in the industrial wastewater treatment system, the water outlet end of the three-stage inner aeration membrane device is connected with the water inlet end of the ultrafiltration device.
Preferably, in the industrial wastewater treatment system, the micro-electrolysis device is filled with iron-carbon micro-electrolysis filler; further, the mass percentage of iron in the iron-carbon micro-electrolysis filler is 75-85%, and the balance is carbon.
Preferably, in the micro-electrolysis device, the specific surface area of the iron-carbon micro-electrolysis filler is 1m 2 /g～1.5m 2 /g; the porosity is 60% -70%; the physical strength is more than or equal to 1000kg/cm.
Preferably, in the industrial wastewater treatment system, the three-stage internal aeration membrane device is sequentially divided into a first-stage anaerobic section, a second-stage anoxic section and a third-stage aerobic section from the water inlet end to the water outlet end, and hollow fiber membranes are arranged in each section of device.
Preferably, in the industrial wastewater treatment system, the hollow fiber membrane of the three-stage internal aeration membrane device is connected with the oxygen supply fan through a pipeline.
Preferably, in the industrial wastewater treatment system, a hollow fiber type ultrafiltration membrane is arranged in the ultrafiltration device; further preferably, the hollow fiber ultrafiltration membrane is a hollow fiber PVDF membrane.
Preferably, in the industrial wastewater treatment system, an ultraviolet lamp and a hydrogen peroxide feeding device are arranged in the optical Fenton device.
A schematic diagram of the wastewater treatment system of the present invention can be seen in fig. 1.
An industrial wastewater treatment method, which uses the industrial wastewater treatment system to treat wastewater, comprises the following steps:
1) The wastewater enters a fiber rotary disc filter tank for pretreatment;
2) The effluent of the fiber turntable filter enters a micro-electrolysis device for electrolysis treatment;
3) The effluent of the micro-electrolysis device enters a three-stage internal aeration membrane device for biological membrane treatment;
4) The effluent of the three-stage internal aeration membrane device enters an ultrafiltration device for filtration treatment, intercepted wastewater flows back to a micro-electrolysis device for treatment, and filtered wastewater is sent to a photo-Fenton device;
5) The wastewater is degraded in the photo Fenton device, part of the degraded wastewater is returned to the three-stage internal aeration membrane device for treatment, and the wastewater treated in the photo Fenton device is discharged after reaching the standard through detection.
Preferably, in step 1) of the industrial wastewater treatment method, the filtration rate of the wastewater is 10m 3 /m 2 ·h～15m 3 /m 2 H; the back flushing period is 0.8 h-1.2 h.
Preferably, in step 2) of the industrial wastewater treatment method, the residence time of the wastewater is 40min to 60min.
Preferably, in the step 3) of the industrial wastewater treatment method, the aeration pressure is controlled to be 0 MPa-0.01 MPa by a first-stage anaerobic section in the three-stage internal aeration membrane device; the aeration pressure of the second-stage anoxic section is controlled to be 0.01MPa to 0.04MPa; the aeration pressure of the third-stage aerobic section is controlled to be 0.04 MPa-0.06 MPa.
Preferably, in step 3) of the industrial wastewater treatment method, the hydraulic retention time of wastewater in the anaerobic section of the three-stage internal aeration membrane device is 1h to 2h, and the COD load is 1.5g COD/m 2 ·d～2.0gCOD/m 2 D; hydraulic retention time of anoxic zone4.5-5 h, COD load of 1.3g COD/m 2 ·d～1.7gCOD/m 2 D; the hydraulic retention time of the aerobic section is 14-16 h, and the COD load is 1.0g COD/m 2 ·d～1.5gCOD/m 2 ·d。
Preferably, in step 4) of the industrial wastewater treatment method, the aperture of the ultrafiltration membrane in the ultrafiltration device is 0.02 μm to 0.04 μm, and the pressure difference between the two sides of the membrane is 0.01MPa to 0.03MPa.
Preferably, in step 4) of the industrial wastewater treatment method, the filtered wastewater is sent to the photoFenton device by negative pressure suction; further, the negative pressure value is 10kPa to 20kPa.
Preferably, in step 5) of the industrial wastewater treatment method, the ultraviolet light wavelength of the optical Fenton device is 200 nm-275 nm, and the energy density is 10 mu W/cm 2 ～100μW/cm 2 。
Preferably, in the step 5) of the industrial wastewater treatment method, the addition amount of the hydrogen peroxide in the optical Fenton device is 100 ppm-200 ppm.
Further, in the step 5) of the industrial wastewater treatment method, the detection standard is in accordance with the emission standard of water pollutants in textile dyeing and finishing industry of GB 4287-2012.
The method for treating wastewater by using the system of the invention is further described in detail below:
in the wastewater treatment system, the fiber rotary disc filter tank is used for pretreating sewage; the micro-electrolysis device mainly removes heavy metals in the wastewater, detoxifies the wastewater, and improves the biodegradability of the wastewater; the three-stage internal aeration membrane device adopts a biomembrane method to reduce the yield of sludge, forms a special biomembrane structure by internal aeration, can change the anaerobic, anoxic and aerobic states of the tank body by controlling the aeration pressure, and degrades pollutants; the ultrafiltration device ensures that the effluent SS reaches the standard and throttles macromolecular substances; the photoFenton device mainly removes non-biodegradable pollutants to ensure that the effluent reaches the standard.
The method for treating the wastewater comprises the following steps:
step 1: the wastewater to be treated passes through a fiber rotary disc filter tank, the filter tank adopts an inlet efficient filter cloth as a filter medium, and suspended matters and pollutants with larger particles in the wastewater are separated from the wastewater under the filtering and intercepting actions of a microporous fiber rotary disc. The highest filtering precision can reach 20 mu m.
The fiber rotary disc filter replaces a series of pretreatment units such as a coarse grille, a fine grille, a coagulation tank, a primary sedimentation tank and the like in the traditional sewage treatment method. The purpose of removing suspended matters is achieved, and meanwhile, the treatment flow is simplified.
Step 2: and (3) the wastewater treated in the step (1) enters a micro-electrolysis device. When the electric current is not applied, the waste water is electrolyzed by utilizing the potential difference generated by the micro-electrolysis filler filled in the waste water. In the cathode of stuffing, great amount of nascent state H and O is produced through reaction, and hydrogen peroxide is added to produce oxidation-reduction reaction with several components in waste water to degrade organic macro molecule and raise the biodegradability of waste water. Meanwhile, heavy metal ions in the wastewater are converted into simple substances or sediments to be removed, so that the wastewater is detoxified, the biodegradability of the wastewater is improved, the load of a subsequent biochemical system is reduced, and the efficiency is improved.
Step 3: and (3) the wastewater treated in the step (2) enters a three-stage internal aeration membrane device. The three-stage internal aeration membrane device comprises three units. Hollow fiber membranes are uniformly distributed in each unit. The hollow part of the hollow fiber membrane is finally connected with an aeration fan through a membrane component and a pipeline, and the fan supplies air to provide oxygen needed by microorganisms. The outer surface of the hollow fiber membrane is adhered and grown with microorganism groups to form a biological membrane structure with a special structure, so as to degrade pollutants in the wastewater. The device has the advantages that the air supply pressure determines whether the biological film is in an anaerobic state, an anoxic state or an aerobic state or the three states coexist. Can be combined by a plurality of processes to realize the purposes of carbon removal, denitrification and dephosphorization. So that most of pollutants containing carbon, nitrogen and phosphorus in the wastewater are removed.
The structural layering of the microbial population on the surface of the hollow fiber membrane is opposite to that of a traditional biological membrane. The part closest to the membrane wires is an aerobic layer, and the part closest to the water body is an anoxic layer or an anaerobic layer. The thickness of the aerobic layer, the anoxic layer and the anaerobic layer is controlled by aeration pressure.
When the aeration pressure is 0.04-0.06MPa, the oxygen penetration rate is higher, the microbial film is in an aerobic state, and the whole tank body is in an aerobic state, which is equivalent to an aerobic tank. When the aeration pressure is 0.01-0.04MPa, the oxygen penetration rate is generally, the inner layer of the microbial membrane is in an aerobic state, the outer layer of the microbial membrane is in an anoxic state, and the whole tank body is in an anoxic state, which is equivalent to an anoxic tank. When the aeration pressure is 0-0.01MPa, the oxygen penetration rate is weaker, the inner layer of the microbial membrane is in an aerobic state, the middle layer is in an anoxic state, the outer layer is in an anaerobic state, and the whole tank body is in an anaerobic state, which is equivalent to an anaerobic tank.
The special structure biological membrane of the three-stage internal aeration membrane device has stronger adaptability to the change of sewage quality and water quantity, has higher organic load, short contact residence time and small occupied area, is convenient for the management of the microorganism fixation on the surface of a carrier, can greatly proliferate the microorganism with longer generation time, has richer and stable biological phase and less produced residual sludge, and avoids the problems of sludge expansion and scum.
Step 4: and (3) introducing the wastewater treated in the step (3) into an ultrafiltration device. The ultrafiltration device takes ultrafiltration membrane wires as a filter medium, has the aperture of 0.02-0.04 mu m, takes the pressure difference at two sides of the membrane as a driving force, has the pressure of 0.01-0.03MPa, and allows water, inorganic salt and micromolecular organic matters in the wastewater to permeate through a micropore structure on the surface of the membrane, so that suspended matters, colloid, proteins, microorganisms and other macromolecular matters in the wastewater are trapped outside. The SS of the effluent is ensured to reach the standard, and macromolecular pollutants can be filtered. Ensuring that only small molecular pollutants which cannot be degraded enter a subsequent process unit.
The ultrafiltration device has small occupied area, compact structure, no microbial loss, almost zero effluent SS, high automation degree, simple and convenient operation and easy control and maintenance.
And 4, refluxing the trapped macromolecular pollutants to the front end of the micro-electrolysis device, repeating the step 2, and degrading the organic macromolecules by breaking the chains again through the redox action of micro-electrolysis, thereby improving the biodegradability of the wastewater.
Step 5: through the steps ofAnd (4) the treated effluent enters a light Fenton device. The ultraviolet light with wave band, wavelength of 200-275 nm and energy density of 10-100 mu W/cm is adopted 2 . Under the irradiation of ultraviolet light, hydrogen peroxide is rapidly decomposed into free radicals with extremely high reduction potential, pollutants in water can be directly oxidized, and the pollutants are decomposed to generate water, carbon dioxide and nitrogen which are harmless to the environment, so that the aim of purifying wastewater is fulfilled. Ensuring that the effluent reaches the discharge standard.
The optical Fenton device has no selectivity on the decomposition of pollutants in the wastewater, and can remove most of organic matters. And H of the device 2 O 2 The utilization rate of the water is higher; ultraviolet pair H 2 O 2 The decomposition speed of the catalyst is more direct than that of the traditional Fenton catalytic decomposition, so that the mineralization degree of the organic matters is higher. The organic matter can be partially decomposed under the irradiation of ultraviolet rays.
And (5) refluxing a part of the effluent water in the step (5) to the front of the three-stage internal aeration device. And part of the pollutant which is difficult to degrade is contacted with the microorganism again through decomposed small molecular substances after photoFenton, so that the removal rate of the system is improved.
The present invention will be described in further detail with reference to specific examples.
Examples:
FIG. 2 is a schematic diagram of a wastewater treatment system according to an embodiment of the present invention. In FIG. 2, a 1-fiber carousel filter; 2-a micro-electrolysis device; 3-three-stage internal aeration membrane device; 4-an ultrafiltration device; a 5-photo Fenton device; 6-a fiber turntable; 7-iron-carbon micro-electrolysis filler; 8-an anaerobic section; 9-an anoxic section; 10-an aerobic section; 11-hollow fiber membranes; 12-an anaerobic section pressure gauge; 13-anaerobic section valve; 14-an anoxic section pressure gauge; 15-an anoxic section valve; 16-an aerobic section pressure gauge; 17-an aerobic section valve; 18-an oxygen supply fan; 19-hollow fiber ultrafiltration membrane; 20-intercepting a waste water reflux pump; 21-a purple light lamp; 22-hydrogen peroxide feeding device; 23-degrading waste water reflux pump.
Next, referring to FIG. 2, a treatment program for printing and dyeing wastewater was set at 3000m in Quanzhou 3 For example, the specific method for treating wastewater by using the system of the invention is as follows:
the sewage treatment system sequentially comprises a fiber turntable filter (1), a micro-electrolysis device (2), a three-stage internal aeration membrane device (3), an ultrafiltration device (4) and a light Fenton device (5).
The wastewater to be treated enters a fiber rotary disc filter tank (1), and a fiber rotary disc (6) is arranged in the fiber rotary disc filter tank (1). The diameter of the fiber rotary table (6) is 3m, the aperture is 100 mu m, the material is polyester fiber material, and the filtering speed is 12m 3 /m 2 H, the back flushing period is 1h. The effluent flows automatically or is lifted to enter the micro-electrolysis device (2).
An artificially synthesized iron-carbon micro-electrolysis filler (7) is arranged in the micro-electrolysis device (2). The specific surface area of the filler is 1.2m 2 Per g, void fraction 65%, physical strength not less than 1000kg/cm, iron content 75-85wt%, carbon mass content 15-25wt% and residence time 50min. The wastewater after micro-electrolysis automatically flows or is lifted into a three-stage internal aeration membrane device (3) after mud-water separation.
The first stage of the three-stage internal aeration membrane device (3) is an anaerobic section (8), the second stage is an anoxic section (9), and the third stage is an aerobic section (10). Hollow fiber membranes (11) are arranged in the three-stage internal aeration membrane devices (3). The hollow fiber membrane of the first-stage anaerobic section (8) is connected with a pressure gauge (12) and a valve (13), and finally is connected with an oxygen supply fan (18). The hollow fiber membrane of the second-stage anoxic section (9) is connected with a pressure gauge (14) and a valve (15), and finally is connected with an oxygen supply fan (18). The hollow fiber membrane of the third-stage aerobic section (10) is connected with a pressure gauge (16) and a valve (17) and finally connected with an oxygen supply fan (18). The pressure of a pressure gauge (12) of the first-stage anaerobic section (8) is controlled to be 0MPa, aeration is not carried out, and an anaerobic state is maintained; the pressure of a pressure gauge (14) of the second-stage anoxic section (9) is controlled to be 0.015MPa, and the anoxic state is maintained by micro-aeration; the pressure of a pressure gauge (16) of the third-stage aerobic section (10) is controlled to be 0.04MPa, and the aeration is carried out properly to maintain the aerobic state. The hydraulic retention time of the anaerobic tank is 1.5h, and the COD load is 1.7g COD/m 2 D; the hydraulic retention time of the anoxic tank is 4.7 hours, and the COD load is 1.5g COD/m 2 D; the hydraulic retention time of the aerobic tank is 15.2 hours, and the COD load is 1.3g COD/m 2 D. The wastewater automatically flows or is lifted to enter an ultrafiltration device (4) after three stages in sequence.
The ultrafiltration device (4) is internally provided with a hollow fiber ultrafiltration membrane (19), the ultrafiltration membrane is made of PVDF, and the aperture is 0.02-0.04 mu m. The filtered relatively clean wastewater is sent to a photoFenton device (5) in a negative pressure suction mode. The negative pressure value is controlled to be 10-20kPa. The waste water intercepted in the membrane tank is sent to the front end of the micro-electrolysis device (2) through a reflux pump (20).
An ultraviolet lamp (21) and a hydrogen peroxide feeding device (22) are arranged in the optical Fenton device (5). Ultraviolet lamp wavelength 254nm, energy density 50 mu W/cm 2 . Under the catalysis of ultraviolet light, the added hydrogen peroxide is rapidly decomposed to generate hydroxyl free radicals, non-biodegradable pollutants in oxidized water, part of effluent is circulated to the front end of the three-stage internal aeration device through a reflux pump (23), and part of pollutants which are difficult to degrade are contacted with microorganisms again through micromolecular substances decomposed after photo-Fenton, so that the effluent is continuously degraded, and the effluent is ensured to reach the emission standard.
The printing and dyeing wastewater was continuously treated through the system for one month, and the water inlet and outlet indexes are shown in table 1.
TABLE 1 wastewater inlet and outlet index
Therefore, after being treated by the treatment system provided by the invention, the effluent meets the direct discharge standard of GB 4287-2012 textile dyeing and finishing industry Water pollutant discharge Standard.
Claims (7)
1. An industrial wastewater treatment system, characterized in that: comprises a fiber turntable filter, a micro-electrolysis device, a three-stage internal aeration membrane device, an ultrafiltration device and a photo Fenton device which are connected in sequence;
the three-stage internal aeration membrane device is sequentially divided into a first-stage anaerobic section, a second-stage anoxic section and a third-stage aerobic section from a water inlet end to a water outlet end, and hollow fiber membranes are arranged in each section of device;
the wastewater outlet intercepted by the ultrafiltration device is connected with the water inlet end of the micro-electrolysis device through a pipeline; the water outlet end of the three-stage inner aeration membrane device is connected with the water inlet end of the ultrafiltration device; the water outlet end of the ultrafiltration device is connected with the water inlet end of the optical Fenton device;
an ultraviolet lamp and a hydrogen peroxide feeding device are arranged in the light Fenton device.
2. An industrial wastewater treatment system according to claim 1 wherein: the micro-electrolysis device is filled with iron-carbon micro-electrolysis filler.
3. An industrial wastewater treatment system according to claim 1 wherein: the hollow fiber membrane of the three-stage internal aeration membrane device is connected with an oxygen supply fan through a pipeline.
4. An industrial wastewater treatment system according to claim 1 wherein: the ultrafiltration device is internally provided with a hollow fiber ultrafiltration membrane.
5. A method for treating industrial wastewater is characterized in that: use of the system according to any one of claims 1 to 4 for wastewater treatment, comprising the steps of:
1) The wastewater enters a fiber rotary disc filter tank for pretreatment;
2) The effluent of the fiber turntable filter enters a micro-electrolysis device for electrolysis treatment;
3) The effluent of the micro-electrolysis device enters a three-stage internal aeration membrane device for biological membrane treatment;
4) The effluent of the three-stage internal aeration membrane device enters an ultrafiltration device for filtration treatment, intercepted wastewater flows back to a micro-electrolysis device for treatment, and filtered wastewater is sent to a photo-Fenton device;
5) The wastewater is degraded in the photo Fenton device, the degraded wastewater flows back to the three-stage internal aeration membrane device for treatment, and the wastewater treated in the photo Fenton device is discharged after reaching the standard through detection.
6. The method for treating industrial wastewater according to claim 5, wherein: in the step 3), the aeration pressure of the first-stage anaerobic section in the three-stage internal aeration membrane device is controlled to be 0MPa to 0.01MPa; the aeration pressure of the second-stage anoxic section is controlled to be 0.01MPa to 0.04MPa; the aeration pressure of the third-stage aerobic section is controlled to be 0.04 MPa-0.06 MPa.
7. The method for treating industrial wastewater according to claim 5, wherein: in the step 4), the aperture of an ultrafiltration membrane in the ultrafiltration device is 0.02-0.04 mu m, and the pressure difference between two sides of the membrane is 0.01-0.03 MPa.
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