CN113354208A - Wastewater zero discharge process - Google Patents
Wastewater zero discharge process Download PDFInfo
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- CN113354208A CN113354208A CN202110679875.9A CN202110679875A CN113354208A CN 113354208 A CN113354208 A CN 113354208A CN 202110679875 A CN202110679875 A CN 202110679875A CN 113354208 A CN113354208 A CN 113354208A
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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
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- 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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- 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
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- 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
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention relates to the technical field of wastewater discharge treatment, in particular to a wastewater zero discharge process, which comprises the following method operation steps: s1: the raw water collecting tank is connected with a Fenton oxidation device through a pipeline, the Fenton oxidation device is connected with a pH adjusting tank through a pipeline, the pH adjusting tank is connected with a pH fine adjustment tank through a pipeline, and the pH fine adjustment tank is connected with a coagulating sedimentation device through a pipeline; s2: the coagulating sedimentation device is connected with a biochemical water inlet tank through a pipeline, the biochemical water inlet tank is connected with a hydrolysis acidification device through an anticorrosive water pipe, and the hydrolysis acidification device is connected with a continuous aerobic tank through a pipeline; s3: compared with the prior art, the continuous aerobic tank is connected with the sedimentation tank through the pipeline, and the sedimentation tank is connected with the secondary sedimentation tank through the pipeline.
Description
Technical Field
The invention relates to the technical field of wastewater discharge treatment, in particular to a wastewater zero discharge process.
Background
Industrial waste water refers to waste water and waste liquid discharged in the process of industrial production, wherein the waste water contains industrial production materials, intermediate products, byproducts lost along with water and pollutants generated in the production process, which are important causes of environmental pollution, particularly water pollution.
However, when purifying industrial wastewater, the conventional industrial wastewater discharge device needs to convey industrial wastewater to an oxidation device to degrade refractory substances contained in the industrial wastewater, adjust the PH value of the wastewater after degradation, convey the wastewater into a sedimentation tank to perform primary sedimentation after adjustment, convey the wastewater into a microbial purification tank after filtration, degrade and remove organic substances in the wastewater by using microbes, convey the degraded wastewater into a secondary sedimentation tank again to perform sedimentation, convey the filtered and precipitated wastewater into a recycling tank to perform secondary use, but the above process has certain disadvantages due to process problems, so that impurities in the purified wastewater are not completely filtered, and waste generated in wastewater filtration is not purified.
Therefore, the invention is necessary to develop a wastewater zero discharge process.
Disclosure of Invention
Therefore, the invention provides a wastewater zero discharge process, the effect and efficiency of microorganism on filtering organic matters in wastewater can be effectively improved by adopting an efficient compound microorganism flora through the arranged hydrolysis acidification device and the continuous aerobic tank, and impurities in the wastewater can be filtered again through the arranged ultrafiltration device and the reverse osmosis device when the wastewater enters the reuse tank, so that the problem of incomplete industrial wastewater purification in the prior art is solved.
In order to achieve the above purpose, the invention provides the following technical scheme: a wastewater zero discharge process comprises the following method operation steps:
s1: the raw water collecting tank is connected with a Fenton oxidation device through a pipeline, the Fenton oxidation device is connected with a pH adjusting tank through a pipeline, the pH adjusting tank is connected with a pH fine adjustment tank through a pipeline, and the pH fine adjustment tank is connected with a coagulating sedimentation device through a pipeline;
s2: the coagulating sedimentation device is connected with a biochemical water inlet tank through a pipeline, the biochemical water inlet tank is connected with a hydrolysis acidification device through an anticorrosive water pipe, and the hydrolysis acidification device is connected with a continuous aerobic tank through a pipeline;
s3: the continuous aerobic tank is connected with a sedimentation tank through a pipeline, the sedimentation tank is connected with a secondary sedimentation tank through a pipeline, and the secondary sedimentation tank is connected with a biological aerated filter through a pipeline;
s4: the aeration biological filter tank is connected with an ultrafiltration device through a pipeline, the ultrafiltration device is connected with a reverse osmosis system through a pipeline, the reverse osmosis system is connected with an evaporation system through a pipeline, and the evaporation system is connected with a reuse water tank through a pipeline;
preferably, the Fenton oxidation device adopts FeSO as the oxidant4And H2O2And (3) a reagent.
Preferably, the pH adjusting reagent added into the pH adjusting tank is lime, and the pH adjusting reagent added into the pH fine adjusting tank is liquid caustic soda.
Preferably, the pH fine adjustment tank is connected with a sludge tank through a sludge conveying pipe, the sedimentation tank is fixedly connected with the sludge tank through a sludge conveying pipe, and the secondary sedimentation tank is fixedly connected with the sludge tank through a sludge conveying pipe.
Preferably, the sludge tank is fixedly connected with a diaphragm pressing plate-and-frame filter press through a sludge conveying pipe.
Preferably, the reverse osmosis system is fixedly connected with a concentrated water collecting tank through a water conveying pipe, the concentrated water collecting tank is fixedly connected with the evaporation system through a pipeline, and the evaporation system is fixedly connected with the reuse water pool through a pipeline.
Preferably, the flocculating agent added in the coagulating sedimentation device is PAC, and the flocculating agent added in the coagulating sedimentation device can also be PAM.
Preferably, the continuous aerobic tank is provided with efficient compound microbial flora through a planting plate.
Preferably, the ultrafiltration device comprises an ultrafiltration body, an ultrafiltration backwashing pump, a CEB dosing device and an air supply system, and the reverse osmosis system comprises a reverse osmosis booster pump, a primary reverse osmosis dosing device, a primary reverse osmosis cartridge filter, a primary reverse osmosis high-pressure pump and a primary reverse osmosis body.
Preferably, the evaporation system comprises a separator, the separator is connected with a mother liquor tank through a pipeline, the separator is connected with a heater through a pipeline, and the heater is connected with a condenser through a pipeline.
The invention has the beneficial effects that:
1. compared with the prior art, the invention adopts an advanced, mature and reliable treatment process to effectively remove various pollutants in the sewage and ensure that various indexes of treated water meet the design requirements, the arranged hydrolysis acidification device and the continuous aerobic pool adopt the efficient composite microbial flora to effectively improve the effect and efficiency of the microorganisms for filtering organic matters in the sewage, and the arranged ultrafiltration device and the reverse osmosis device can filter impurities in the sewage again when the sewage enters the reuse pool.
2. According to the invention, the sludge precipitated in the coagulating sedimentation device, the sedimentation tank and the secondary sedimentation tank can be conveyed into the sludge tank, the sludge tank can convey the sludge into the diaphragm pressing plate-and-frame filter press, the diaphragm pressing plate-and-frame filter press can press and filter the sludge conveyed by the sludge tank, the sludge can be made into mud cakes, and finally workers convey the mud cakes to a field for recycling through a truck, so that the sludge can be efficiently utilized.
3. According to the invention, the concentrated water generated by the reverse osmosis system can be conveyed into the concentrated water collecting tank through the concentrated water pipe, the concentrated water can be conveyed into the evaporation system through the concentrated water collecting tank through a pipeline, the arranged evaporation system can separate out salt contained in the concentrated water through the evaporation effect, and the evaporated steam can be conveyed to the reuse water pool for recycling after condensation, so that the filtered concentrated water can be treated, the environment pollution of the filtered concentrated water is prevented, and the resource in the concentrated water can be reused.
Drawings
FIG. 1 is a schematic view of the overall process flow structure of the present invention;
FIG. 2 is a schematic view of the flow structure of sludge treatment in the present invention;
FIG. 3 is a schematic view of the flow structure of the evaporation system of the present invention.
In the figure: 1. a raw water collecting tank; 2. a Fenton oxidation device; 3. a pH adjusting tank; 4. a pH fine adjustment tank; 5. A coagulating sedimentation device; 6. a biochemical water inlet tank; 7. a hydrolysis acidification device; 8. a continuous aerobic tank; 9. a sedimentation tank; 10. a secondary sedimentation tank; 11. an aeration biological filter; 12. an ultrafiltration device; 13. a reverse osmosis system; 14. A reuse water tank; 15. a sludge tank; 16. a diaphragm pressing plate-and-frame filter press; 17. a concentrated water collecting tank; 18. an evaporation system; 19. a condenser; 20. a separator; 21. a mother liquor tank; 22. a heater.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
11. Referring to the attached drawings 1-3, the invention provides a wastewater zero discharge process, which comprises the following method operation steps:
s1: the raw water collecting tank 1 is connected with a Fenton oxidation device 2 through a pipeline, the Fenton oxidation device 2 is connected with a pH adjusting tank 3 through a pipeline, the pH adjusting tank 3 is connected with a pH fine adjustment tank 4 through a pipeline, and the pH fine adjustment tank 4 is connected with a coagulating sedimentation device 5 through a pipeline;
s2: the coagulating sedimentation device 5 is connected with a biochemical water inlet tank 6 through a pipeline, the biochemical water inlet tank 6 is connected with a hydrolysis acidification device 7 through an anti-corrosion water pipe, and the hydrolysis acidification device 7 is connected with a continuous aerobic tank 8 through a pipeline;
s3: the continuous aerobic tank 8 is connected with a sedimentation tank 9 through a pipeline, the sedimentation tank 9 is connected with a secondary sedimentation tank 10 through a pipeline, and the secondary sedimentation tank 10 is connected with a biological aerated filter 11 through a pipeline;
s4: the biological aerated filter 11 is connected with an ultrafiltration device 12 through a pipeline, the ultrafiltration device 12 is connected with a reverse osmosis system 13 through a pipeline, the reverse osmosis system 13 is connected with an evaporation system 18 through a pipeline, and the evaporation system 18 is connected with a reuse water tank 14 through a pipeline;
further, it is characterized byThe Fenton oxidation device 2 adopts FeSO as an oxidant4And H2O2Reagent, the Fenton oxidation device 2 is adopted as the device for oxidation treatment, the used reagent is environment-friendly material, and H is generated in the water treatment process2O、O2And ferric hydroxide, no secondary pollution, strong oxidation of Fenton reagent, high organic matter degradation speed, application in advanced treatment of waste water, and capability of improving the biochemical degradability of organic matters, H2O2As a strong oxidant, it can oxidize organic and inorganic toxic pollutants in water into non-toxic or easily decomposed compounds by microorganisms. However, in general, the effect of using only hydrogen peroxide is not very desirable for high concentrations of organic contaminants that are difficult to degrade. FeSO4The introduction of the catalyst greatly improves the treatment effect of the hydrogen peroxide;
further, the pH adjusting reagent added into the pH adjusting tank 3 is lime, the pH adjusting tank 3 can be used for roughly adjusting the pH value of the wastewater through the lime, the pH adjusting reagent added into the pH fine-adjusting tank 4 is liquid caustic soda, and the pH fine-adjusting tank 4 can be used for accurately adjusting the pH value of the wastewater through the liquid caustic soda, so that the pH value of the wastewater can finally reach the required standard;
further, pH fine setting pond 4 is connected with sludge impoundment 15 through defeated mud pipe, sedimentation tank 9 is through defeated mud pipe and sludge impoundment 15 fixed connection, secondary sedimentation tank 10 is through defeated mud pipe and sludge impoundment 15 fixed connection, the coagulating sedimentation device 5 that sets up is for carrying out primary sedimentation to waste water, thereby can filter the impurity that contains in the waste water earlier, be convenient for follow-up purification treatment to waste water, make the effect of waste water purification better, biochemical intake pool 6 that sets up is for making the waste water after filtering the sediment mix with all the other domestic waste water, be convenient for follow-up handle waste water together, hydrolysis acidification device 7 that sets up is the earlier stage of utilizing anaerobic treatment, according to the difference of methanogen and hydrolysis acid-producing bacteria growth condition, with anaerobic treatment control under the condition that contains a large amount of hydrolysis bacteria, the acidizing bacteria, utilize the hydrolysis bacteria, The acidification bacteria hydrolyze insoluble organic matters in water into soluble organic matters, and convert macromolecular substances which are difficult to biodegrade into micromolecular substances which are easy to biodegrade, and play a very important role in the wastewater treatment process;
further, the sludge pool 15 is fixedly connected with a membrane pressing plate-and-frame filter press 16 through a sludge conveying pipe, the arranged sludge pool 15 is used for collecting the filtered precipitated sludge, the arranged membrane pressing plate-and-frame filter press 16 can press and filter the sludge conveyed by the sludge pool 15, the sludge can be made into mud cakes, finally, workers can convey the mud cakes to the field through a truck for recycling, so that the filtered sludge can be reused, the arranged continuous aerobic pool 8 is one of core facilities for biochemical treatment, the biochemical process of the microorganisms is mainly carried out in the aerobic pool, the effluent water of hydrolytic acidification flows into the aerobic pool, the aerobic pool is aerated through a fan, aerobic microorganisms are supplied for metabolism, organic matters in the water are converted into gas, water and microorganism bodies which are harmless to the environment through the aerobic microorganisms, and the arranged sedimentation pool 9 and the secondary sedimentation pool 10 are used for flocculating, precipitating and precipitating the purified wastewater of the microorganisms again And filtering, thus can filter the impurity that contains in the exhausted water again, thus make the purified effect of exhausted water better, the aeration biological filter 11 set up in order to utilize biomembrane to remove SS, COD, BOD that contain in the exhausted water, and have effects of nitrifying, denitrogenation, dephosphorization, removing AOX, the reuse water basin 14 set up in order to deliver the exhausted water after purifying to its necessary position, facilitate the reuse of the exhausted water;
furthermore, the reverse osmosis system 13 is fixedly connected with a concentrated water collecting tank 17 through a water conveying pipe, the concentrated water collecting tank 17 is arranged for collecting concentrated water filtered out from the reverse osmosis system 13, the evaporation system 18 is arranged for separating out salt contained in the concentrated water through the evaporation effect, the evaporated steam can be conveyed to the reuse water pool 14 for recycling after condensation, so that the filtered concentrated water can be treated to prevent the filtered concentrated water from polluting the environment, the resource in the concentrated water can be reused, the concentrated water collecting tank 17 is fixedly connected with the evaporation system 18 through a pipeline, and the evaporation system 18 is fixedly connected with the reuse water pool 14 through a pipeline;
further, the flocculating agent added into the coagulating sedimentation device 5 is PAC, and the flocculating agent added into the coagulating sedimentation device 5 can also be PAM;
further, the continuous aerobic tank 8 is provided with high-efficiency compound microorganism flora through the planting plate, the high-efficiency compound microorganism comprises more than 100 microorganisms, including microorganism flora with three functions, and compared with the traditional activated sludge or anaerobic sludge, the continuous aerobic tank has the following advantages: 1. the strains are complete in variety and sufficient in quantity, so that the decomposition of various complex organic matters difficult to treat is smoothly completed; 2. the strains have various types, can adapt to toxic environment, can work and cooperate to exert full strength and complete difficult tasks; 3. the high-efficiency composite bacteria has strong decomposition capability, so that odor can be eliminated, the amount of fixed products is reduced, the sludge yield is greatly reduced, and the subsequent treatment cost is reduced; and the efficiency of the flora for decomposing the organic matters is more effective than that of common pure strains, and one organic matter is utilized and decomposed by the composite strain microbial strains until the organic matter is decomposed into harmless final products. The use of pure strains to decompose harmful substances can stop at a certain intermediate stage, and if no other bacteria continue to decompose residual intermediate products, the treatment of the wastewater cannot be completed.
Further, ultrafiltration device 12 includes the ultrafiltration body, the ultrafiltration backwash pump, the CEB charge device, gas supply system, the ultrafiltration device 12 of setting is with the membrane separation technique that pressure differential is the motive force, the average pore diameter is between reverse osmosis membrane and millipore filtration membrane, hold back the bacterium in the aquatic, the virus, the colloid, particle such as macromolecule, and water and low molecular weight solute permeate membrane, thereby reach the effect of filtering impurity, the ultrafiltration body has business turn over water subassembly and filtration membrane subassembly to constitute, the ultrafiltration backwash pump of setting is led to the mode for through periodic backwash, get rid of the solid particle of filtration membrane surface deposit. The dirt which is adsorbed on the surface of the membrane and is not removed by backwashing is removed by chemical enhanced backwashing, chemical cleaning agent is added, and the dirt is removed by short-time soaking and rinsing. Backwashing and chemically reinforced backwashing effectively ensure the cleanness of the surface of the ultrafiltration membrane and provide reliable guarantee for long-term stability of the water yield of the ultrafiltration device 12; the CEB dosing device is composed of an acid dosing device, an alkali dosing device and a bactericide dosing device, wherein the acid dosing device is used for preventing salt scaling caused by ultrafiltration under the condition of high calcium and magnesium plasma content in inlet water and is composed of 1 solution tank, 1 metering tank and 1 metering pump; the alkali dosing device is used for reducing the microbial activity in raw water and preventing organic pollution caused by ultrafiltration, and consists of 1 solution tank, 1 stirrer, 1 metering tank and 1 metering pump; the bactericide adding device is used for reducing the activity of microorganisms in raw water, preventing organic matter pollution caused by ultrafiltration, the device consists of 1 solution tank, 1 metering tank and 1 metering pump, an air supply system is arranged for air washing of the ultrafiltration membrane to form bubble disturbance, so that pollutants attached to the surface of the ultrafiltration membrane are dropped off, then the pollutants are washed off from a membrane cavity through backwashing, the air supply system consists of an air storage tank, an air pressure reducing valve and an air flow meter, the reverse osmosis system 13 comprises a reverse osmosis booster pump, a reverse osmosis dosing device, a reverse osmosis cartridge filter, a reverse osmosis high-pressure pump and a reverse osmosis body, the reverse osmosis system 13 is arranged by means of the function of selecting a permeable membrane and taking pressure difference as a driving force, when the pressure applied in the system is larger than the osmotic pressure of the solution, water molecules continuously permeate the membrane, flow into the central pipe through the water production flow passage and are conveyed to the reverse osmosis water production tank through the water production pipe. Impurities in the feed water, such as: ions, organic matters, bacteria, viruses and the like are intercepted on the water inlet side of the membrane and are discharged into a concentrated water collecting tank 17 by a concentrated water pipe for storage, and a reverse osmosis booster pump is arranged for conveying the pretreated produced water to a reverse osmosis system to ensure the water pressure in front of a high-pressure pump; the reverse osmosis dosing device is composed of a reducing agent dosing device, a scale inhibitor dosing device and a non-oxidative bactericide dosing device, the reducing agent dosing device is used for removing residual chlorine in the inlet water and ensuring that the reverse osmosis membrane is not damaged by the residual chlorine, the scale inhibitor feeding device is characterized in that before pretreated raw water enters reverse osmosis, high-efficiency scale inhibitors are added to prevent scale formation and membrane blockage caused by precipitation after concentration of insoluble salts such as calcium carbonate, magnesium carbonate and calcium sulfate in reverse osmosis concentrated water, which consists of 1 solution tank, 1 metering tank and 2 metering pumps, wherein the non-oxidizing bactericide dosing device is used for reducing the pollution degree of organic matters to the membrane and ensuring the flux of the membrane, the device consists of 1 solution tank, 1 metering tank and 2 metering pumps, and the arranged reverse osmosis cartridge filter is the final guarantee for removing particles before raw water enters reverse osmosis. The thickness of the reverse osmosis membrane is about 10 mu m, and if the particle concentration is too high, the reverse osmosis membrane is easy to block; if the particle size of the particles is too large, the particles can break down a reverse osmosis membrane component after being accelerated by a high-pressure pump to cause salt leakage, and simultaneously scratch an impeller of the high-pressure pump, the impeller consists of a filter shell and a large-flow folding filter element, and the filtering precision of the filter element is 5 microns; the reverse osmosis high-pressure pump is arranged to provide enough water inlet quantity and water inlet pressure for the reverse osmosis body device; the reverse osmosis body consists of a pressure container and a reverse osmosis membrane;
further, the evaporation system 18 includes a separator 20, the separator 20 is connected to a mother liquor tank 21 through a pipeline, the separator is connected to a heater 22 through a pipeline, the heater 22 is connected to a condenser 19 through a pipeline, a concentrated water collecting tank 17 storing concentrated water is connected to the separator 20 through a pipeline, the concentrated water collecting tank 17 can convey the concentrated water into the separator 20, the separator 20 can separate various solutions mixed in the concentrated water, the separated solutions can enter the heater 22 through a pipeline, the heater 22 can evaporate the solutions, evaporated crystals can be sent to a solid waste treatment place for treatment, a part of the evaporated steam can enter the condenser 19, the condenser 19 can condense the steam into liquid water, the other part of the steam can return to the separator 2O along with the evaporated mother liquor, the separator 20 can separate the mother liquor again, the separated mother liquor enters a mother liquor tank 21 for storage, and the steam enters a condenser 19 along a pipeline and is condensed into liquid water.
The using process of the invention is as follows: firstly, wastewater enters a raw water collecting tank 1 through a workshop pipeline, the raw water collecting tank 1 is pumped into a Fenton device 2 through a pump, the Fenton oxidation device 2 can oxidize and degrade refractory substances, the biodegradability of the wastewater is improved, the oxidized wastewater enters a coagulating sedimentation device 5, a pH adjusting tank 3 and a pH fine-adjusting tank 4 are arranged, lime and liquid alkali can be added into the coagulating sedimentation device 5 to adjust the pH value, and then the lime and the liquid alkali are added into the coagulating sedimentation device 5 to adjust the pH valueAdding PAC and PAM for precipitation to remove fluorine ions and phosphate ions in the wastewater, enabling the precipitated wastewater to enter a biochemical water inlet tank 6, simultaneously mixing other wastewater to enter the biochemical water inlet tank 6, enabling the effluent to enter a hydrolysis acidification device 7 and a continuous aerobic tank 8, carrying out microbial degradation on the wastewater by the hydrolysis acidification device 7 and the continuous aerobic tank 8, enabling the effluent after degradation to enter a sedimentation tank 9 and a secondary sedimentation tank 10, and adding PAC/PAM/sodium carbonate/CaCl into the sedimentation tank 9 and the secondary sedimentation tank 102Precipitating the wastewater again, feeding the wastewater effluent after precipitation into a biological aerated filter 11 so as to remove residual COD and other organic matters, feeding the effluent into an ultrafiltration device 12 and a reverse osmosis membrane system 13, performing ultrafiltration and reverse osmosis filtration on impurities in the wastewater again, feeding the reverse osmosis effluent into a reuse water tank 14, and reusing the wastewater in each reuse point by the reuse water tank 14;
in the process, the sludge precipitated in the coagulating sedimentation device 5, the sedimentation tank 9 and the secondary sedimentation tank 10 is conveyed into the sludge tank 15, the sludge tank 15 conveys the sludge into the membrane pressing plate-and-frame filter press 16, the membrane pressing plate-and-frame filter press 16 presses and filters the sludge conveyed by the sludge tank 15, the sludge is made into mud cakes, and finally workers convey the mud cakes to the field through trucks for recycling;
concentrated water generated by the reverse osmosis system 13 is conveyed into a concentrated water collecting tank 17 through a concentrated water pipe, the concentrated water collecting tank 17 can convey the concentrated water into a separator 20, the separator 20 can separate various solutions mixed in the concentrated water, the separated solutions enter a heater 22 through a pipeline, the heater 22 can evaporate the various solutions, evaporated crystals can be conveyed to a solid waste treatment position for treatment, a part of evaporated steam enters a condenser 19, the condenser 19 condenses the steam into liquid water, the other part of steam returns to the separator 2O along with the evaporated mother liquor, the separator 20 separates the mother liquor again, the separated mother liquor enters a mother liquor 21 for storage, the steam enters the condenser 19 along the pipeline, and the evaporated steam can be conveyed to a reuse water tank 14 for recycling after condensation, therefore, the filtered concentrated water can be treated to prevent the filtered concentrated water from polluting the environment, and resources in the concentrated water can be reused.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solution described above. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (10)
1. A wastewater zero discharge process is characterized in that: the method comprises the following operation steps:
s1: the raw water collecting tank (1) is connected with a Fenton oxidation device (2) through a pipeline, the Fenton oxidation device (2) is connected with a pH adjusting tank (3) through a pipeline, the pH adjusting tank (3) is connected with a pH fine adjusting tank (4) through a pipeline, and the pH fine adjusting tank (4) is connected with a coagulating sedimentation device (5) through a pipeline;
s2: the coagulating sedimentation device (5) is connected with a biochemical water inlet tank (6) through a pipeline, the biochemical water inlet tank (6) is connected with a hydrolysis acidification device (7) through an anti-corrosion water pipe, and the hydrolysis acidification device (7) is connected with a continuous aerobic tank (8) through a pipeline;
s3: the continuous aerobic tank (8) is connected with a sedimentation tank (9) through a pipeline, the sedimentation tank (9) is connected with a secondary sedimentation tank (10) through a pipeline, and the secondary sedimentation tank (10) is connected with a biological aerated filter (11) through a pipeline.
S4: the biological aerated filter (11) is connected with an ultrafiltration device (12) through a pipeline, the ultrafiltration device (12) is connected with a reverse osmosis system (13) through a pipeline, the reverse osmosis system (13) is connected with an evaporation system (18) through a pipeline, and the evaporation system (18) is connected with a reuse water tank (14) through a pipeline.
2. The process of claim 1, wherein the process is characterized in that: the Fenton oxidation device (2) adopts FeSO as an oxidant4And H2O2And (3) a reagent.
3. The process of claim 1, wherein the process is characterized in that: the pH adjusting reagent added into the pH adjusting tank (3) is lime, and the pH adjusting reagent added into the pH fine adjusting tank (4) is liquid caustic soda.
4. The process of claim 1, wherein the process is characterized in that: the pH fine adjustment tank (4) is connected with a sludge tank (15) through a sludge conveying pipe, the sedimentation tank (9) is fixedly connected with the sludge tank (15) through a sludge conveying pipe, and the secondary sedimentation tank (10) is fixedly connected with the sludge tank (15) through a sludge conveying pipe.
5. The process of claim 4, wherein the process is characterized in that: the sludge pool (15) is fixedly connected with a diaphragm pressing plate-and-frame filter press (16) through a sludge conveying pipe.
6. The process of claim 1, wherein the process is characterized in that: the reverse osmosis system (13) is fixedly connected with a concentrated water collecting tank (17) through a water conveying pipe, the concentrated water collecting tank (17) is fixedly connected with an evaporation system (18) through a pipeline, and the evaporation system (18) is fixedly connected with a reuse water pool (14) through a pipeline.
7. The process of claim 1, wherein the process is characterized in that: the flocculating agent added into the coagulating sedimentation device (5) is PAC, and the flocculating agent added into the coagulating sedimentation device (5) can also be PAM.
8. The process of claim 1, wherein the process is characterized in that: and the continuous aerobic tank (8) is internally provided with an efficient compound microbial flora through a planting plate.
9. The process of claim 1, wherein the process is characterized in that: the ultrafiltration device (12) comprises an ultrafiltration body, an ultrafiltration backwashing pump, a CEB dosing device and an air supply system, and the reverse osmosis system (13) comprises a reverse osmosis booster pump, a reverse osmosis dosing device, a reverse osmosis cartridge filter, a reverse osmosis high-pressure pump and a reverse osmosis body.
10. The process of claim 1, wherein the process is characterized in that: the evaporation system (18) comprises a separator (20), the separator (20) is connected with a mother liquor tank (21) through a pipeline, the separator is connected with a heater (22) through a pipeline, and the heater (22) is connected with a condenser (19) through a pipeline.
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| CN104843941A (en) * | 2015-05-05 | 2015-08-19 | 安徽省益农化工有限公司 | Glyphosate waste water treatment process |
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