CN112551817A - Mixed wastewater integrated sewage treatment system - Google Patents
Mixed wastewater integrated sewage treatment system Download PDFInfo
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- CN112551817A CN112551817A CN202011494584.4A CN202011494584A CN112551817A CN 112551817 A CN112551817 A CN 112551817A CN 202011494584 A CN202011494584 A CN 202011494584A CN 112551817 A CN112551817 A CN 112551817A
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- 238000005345 coagulation Methods 0.000 claims abstract description 88
- 230000015271 coagulation Effects 0.000 claims abstract description 88
- 239000003973 paint Substances 0.000 claims abstract description 51
- 239000012459 cleaning agent Substances 0.000 claims abstract description 40
- 238000005507 spraying Methods 0.000 claims abstract description 39
- 239000003814 drug Substances 0.000 claims abstract description 37
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- 238000002156 mixing Methods 0.000 claims abstract description 28
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- 239000010802 sludge Substances 0.000 claims description 96
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- 238000006243 chemical reaction Methods 0.000 claims description 34
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- 238000000034 method Methods 0.000 claims description 23
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- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 claims description 9
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- 206010021143 Hypoxia Diseases 0.000 claims description 2
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- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000004278 EU approved seasoning Substances 0.000 description 1
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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
- C02F1/52—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
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/52—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
-
- 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
-
- 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
-
- 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
-
- 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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
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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
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- 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
- C02F3/308—Biological phosphorus removal
-
- 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
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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 Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a mixed wastewater integrated sewage treatment system which comprises a wastewater collecting tank, a pretreatment coagulation tank, a pretreatment collecting tank, a mixing tank and a combined biochemical tank, wherein paint spraying wastewater and cleaning agent wastewater are conveyed into the wastewater collecting tank through a wastewater pipe network, after flow regulation and homogenization treatment are carried out in the wastewater collecting tank, the paint spraying wastewater and the cleaning agent wastewater are conveyed into the pretreatment coagulation tank through a wastewater lifting pump I, after coagulation and precipitation pretreatment is carried out in the pretreatment coagulation tank, supernatant of the pretreatment coagulation tank flows into the pretreatment collecting tank through a pipeline, after treatment in the pretreatment collecting tank, the supernatant of the pretreatment collecting tank is conveyed into the mixing tank through a wastewater lifting pump II to be mixed with domestic sewage, and after treatment, a mixed water body is conveyed into the combined biochemical tank through a wastewater lifting pump III and finally discharged after reaching the standard. The system has the advantages of compact structure, small occupied area, low energy consumption, low medicament use cost, low overall comprehensive treatment cost, strong flexibility and good operation stability.
Description
Technical Field
The invention relates to the field of mixed wastewater integrated sewage treatment systems, and particularly belongs to a mixed wastewater integrated sewage treatment system.
Background
In the production and manufacturing process of products, machining and part of metal part product enterprises can generate a certain amount of domestic sewage generated in the production and living process of workers in enterprises and workshops, such as paint spraying wastewater, cleaning agent wastewater and the like, and if the sewage and the sewage are directly discharged, the environmental pollution is generated. The research shows that: COD of paint spraying wastewater generated in the production and manufacturing processes of machining and part of metal part product enterprisesCr(potassium dichromate is used as an oxidant to determine the chemical oxygen demand of the wastewater) is within the range of 5000-10000 mg/L, the total nitrogen content of the paint spraying wastewater is within the range of 200-1000 mg/L, and the COD (chemical oxygen demand) of the cleaning agent wastewaterCrThe total phosphorus content of the cleaning agent wastewater is within the range of 20000-50000 mg/L and within the range of 50-100 mg/L. Meanwhile, the data are related to products produced by different enterprises and the types of paint cleaning agents, and the measured value ranges of pollutants are different. Compared with the production of domestic sewage in the production and living processes of enterprise workshop workers, the paint spraying wastewater and the cleaning agent wastewater have the characteristics of small water quantity, complex components and high pollutant concentration.
At present, when treating the waste water of spraying paint and the waste water of cleaning agent, there are the following problems: 1) the paint spraying wastewater and the cleaning agent wastewater are treated by a single physical and chemical method, the treated effluent cannot reach the standard, and the whole operation treatment cost is high; 2) the paint spraying wastewater and the cleaning agent wastewater lack enough nutrient substances, have poor biodegradability and are difficult to be further treated by a biochemical method. However, general enterprise workshop workers have enough nutrients such as C, N, P in domestic sewage generated in the production and life processes, and the B/C value (biodegradability) is high and the biodegradability is good.
Because the paint spraying wastewater contains higher nitrogen element and the cleaning agent wastewater contains higher phosphorus element, the two kinds of wastewater can balance the nutrient substances of the wastewater after being mixed, and then are mixed with the domestic sewage generated in the production and life processes of enterprise workshop workers, so that the whole biodegradability of the wastewater can be improved. Therefore, aiming at the problems of difficult treatment, high cost and poor biodegradability of the paint spraying wastewater and the cleaning agent wastewater, the invention provides a mixed wastewater integrated sewage treatment system, which is combined with a specific use step method and related matched devices, firstly carries out pretreatment on the paint spraying wastewater and the cleaning agent wastewater by a physicochemical method, then carries out deep treatment on the mixed wastewater after being mixed with workshop domestic sewage by a biochemical combined process, and can solve the problems of poor biodegradability of the wastewater, substandard effluent and high treatment cost.
Disclosure of Invention
The invention provides a mixed wastewater integrated sewage treatment system, which solves the problems mentioned in the background technology by the integral comprehensive optimization design of a wastewater collecting tank, a pretreatment coagulation tank, a sludge drying tank, a pretreatment collecting tank, a mixing tank, a combined biochemical tank and a hydrolysis acidification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank in the combined biochemical tank. Meanwhile, the system disclosed by the invention is compact in structure, small in occupied area, low in energy consumption, low in medicament use cost, low in overall comprehensive treatment cost, strong in flexibility, good in operation stability, capable of solving the problems that the paint spraying wastewater and the cleaning agent wastewater are difficult to treat, poor in biodegradability in the treatment process of the paint spraying wastewater and the cleaning agent wastewater, substandard effluent and high in treatment cost, and suitable for popularization and application in mixed treatment of the paint spraying wastewater, the cleaning agent wastewater and domestic sewage.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a mixed wastewater integrated sewage treatment system is characterized by comprising a wastewater collecting tank, a pretreatment coagulation tank, a sludge drying tank, a pretreatment collecting tank, a mixing tank and a combined biochemical tank, wherein the combined biochemical tank comprises a hydrolysis acidification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, paint spraying wastewater and cleaning agent wastewater are conveyed into the wastewater collecting tank through a wastewater pipe network, after flow regulation and homogenization treatment are carried out in the wastewater collecting tank, the paint spraying wastewater and the cleaning agent wastewater are conveyed into the pretreatment coagulation tank through a wastewater lifting pump I, after coagulation and sedimentation pretreatment in the pretreatment coagulation tank, most organic matters and suspended matters in the wastewater are removed, sludge in the pretreatment coagulation tank is discharged into the sludge drying tank for drying and dehydration treatment, supernatant in the pretreatment coagulation tank flows into the pretreatment collecting tank through a pipeline, after the pretreatment collecting tank is treated, the supernatant in the pretreatment collecting tank is conveyed into the mixing tank through a wastewater lifting pump II to be mixed with domestic sewage, the water after mixing is carried to the combination biochemical pond through waste water elevator pump three in proper order, and finally after handling through hydrolysis acidification pool, anaerobism pond, oxygen deficiency pond, good oxygen pond and sedimentation tank up to standard, outwards discharge after reaching standard, there is the agitator upper portion in the preliminary treatment coagulating basin, preliminary treatment coagulating basin lower part is hourglass hopper-shaped, there is a mud pipe in the bottom of preliminary treatment coagulating basin hourglass hopper-shaped lower part, is equipped with the mud valve above the mud pipe, there is sludge drying tank below the mud pipe, and preliminary treatment coagulating basin wholly is located sludge drying tank top, the supernatant of preliminary treatment coagulating basin is in the pipeline inflow preliminary treatment catchment pond of flowing through, is equipped with the clear water valve on the pipeline that the supernatant flows through, mixing tank upper portion is equipped with domestic sewage inlet pipe assembly, and domestic sewage gets into mixing tank through domestic sewage inlet pipe assembly, and domestic sewage mix in mixing tank with the preliminary treatment coagulating basin supernatant through waste water elevator pump two transport, the mixed water body is conveyed to the bottom of a hydrolysis acidification pool in a combined biochemical pool through a wastewater lifting pump III, a water distribution pipe is arranged at the bottom of the hydrolysis acidification pool, a suspended filler is arranged in the middle of the hydrolysis acidification pool, the mixed water body enters the hydrolysis acidification pool after being distributed through the water distribution pipe at the bottom of the hydrolysis acidification pool, the water body enters an anaerobic pool after undergoing anaerobic hydrolysis reaction in the hydrolysis acidification pool, a submersible stirrer is arranged in the anaerobic pool, phosphorus accumulating bacteria are arranged in the anaerobic pool, the phosphorus accumulating bacteria can release phosphorus to the water body in the anaerobic pool under the conditions of anaerobism and nutrient substances, the water body enters an anoxic pool after undergoing biological phosphorus removal reaction in the anaerobic pool, a submersible stirrer is arranged in the anoxic pool, denitrifying bacteria are arranged in the anoxic pool, the water body can be subjected to denitrification reaction in the anoxic pool so as to remove nitrogen pollutants in the water body, and the water body after undergoing denitrification reaction in the anoxic pool enters an aerobic pool, the bottom of the aerobic tank is provided with an aerator pipe, the middle part of the aerobic tank is provided with an MBBR filler, one side of the aerobic tank is provided with a water outlet, a filter screen is arranged at the water outlet of the aerobic tank and can intercept the MBBR filler in the aerobic tank, a water body generates nitration reaction and aerobic oxidation reaction in the aerobic tank, ammonia nitrogen in the water body is oxidized into nitrate nitrogen and nitrite nitrogen, organic matters in the water body are oxidized into carbon dioxide and water, the water body treated by the aerobic tank enters a sedimentation tank through the water outlet of the aerobic tank, activated sludge in the water in the sedimentation tank can be separated from clear water after sedimentation treatment, and a part of activated sludge in the sedimentation tank can flow back to the anaerobism pond, and another part of excess sludge in the sedimentation tank can be arranged to the sludge drying pond through arranging mud pipe assembly and handle after drying, and the clear water in the sedimentation tank can be discharged outside after reaching standard.
Furthermore, a gas stripping nitrifying liquid reflux device is arranged at the upper part in the aerobic tank, the gas stripping nitrifying liquid reflux device can reflux nitrifying liquid after the nitrification reaction in the aerobic tank into the anoxic tank, and the nitrifying liquid is a water body containing nitrate nitrogen and nitrite nitrogen;
the upper part in the sedimentation tank is provided with a gas stripping sludge reflux device which can reflux the activated sludge in the sedimentation tank into the anaerobic tank;
and escalators are arranged on the side surfaces of the wastewater collecting tank, the pretreatment coagulation tank and the pretreatment collecting tank.
Further, after the paint spraying wastewater and the cleaning agent wastewater are subjected to flow regulation and homogenization treatment in the wastewater collection tank, the paint spraying wastewater and the cleaning agent wastewater are conveyed into a pretreatment coagulation tank through a wastewater lifting pump, sodium hydroxide NaOH, polyaluminium chloride PAC and anionic polyacrylamide PAM medicines are sequentially added into the pretreatment coagulation tank to perform a pretreatment coagulation reaction, and the concrete operation steps are as follows:
the method comprises the following steps: starting a stirrer at the upper part in the pretreatment coagulation tank, so that the subsequent wastewater and the medicines can be fully mixed;
step two: adding a sodium hydroxide NaOH drug with the concentration of 10% into the pretreatment coagulation tank, and adjusting the pH value of the mixed wastewater in the pretreatment coagulation tank to be within the range of 8-9;
step three: adding a polyaluminum chloride PAC medicine with the concentration of 5% into the mixed wastewater in the pretreatment coagulation pool, wherein the adding amount of the polyaluminum chloride PAC medicine is controlled within the range of 20-50 mg/L, and the polyaluminum chloride PAC medicine can be used as a coagulant to remove most suspended pollutants (such as paint colloid and the like) in the mixed wastewater in the pretreatment coagulation pool;
step four: adding 0.5% of anionic polyacrylamide PAM (polyacrylamide) medicine into the mixed wastewater in the pretreatment coagulation tank, wherein the addition amount of the anionic polyacrylamide PAM medicine is controlled within the range of 2-5 mg/L, the anionic polyacrylamide PAM medicine can be used as a coagulant aid to form a large-size flocculent substance through a bridge frame and adsorption, the anionic polyacrylamide PAM medicine can increase the precipitation rate of pollutants in the mixed wastewater in the pretreatment coagulation tank, and the anionic polyacrylamide PAM medicine can improve the removal effect of the pollutants in the mixed wastewater in the pretreatment coagulation tank;
step five: after the mixed wastewater in the pretreatment coagulation tank is sequentially treated in the first step to the fourth step and the subsequent time lasts for 1-2 hours, opening a sludge discharge valve on a sludge discharge pipeline at the lower part of the pretreatment coagulation tank, so that solid precipitates such as sludge and paint slag in the pretreatment coagulation tank are discharged into a sludge drying tank below the pretreatment coagulation tank through the sludge discharge pipeline, and the solid precipitates such as the sludge and the paint slag can be naturally concentrated and dehydrated in the sludge drying tank, thereby reducing the water content and the volume of the solid precipitates and reducing the post-treatment cost of the solid precipitate sludge;
step six: and the supernatant in the pretreatment coagulation tank flows into the pretreatment water collecting tank through a pipeline, the supernatant flows through a clean water valve on the pipeline after being opened, and then the supernatant in the pretreatment coagulation tank enters the pretreatment water collecting tank through the clean water valve.
Further, the sludge naturally drying dehydration device is arranged in the sludge drying tank below the pretreatment coagulation tank, the water content of solid precipitates such as sludge and paint slag in the sludge naturally drying dehydration device can be reduced to 60%, no dehydration agent needs to be added in the sludge naturally drying dehydration device, no electric energy needs to be added when the sludge naturally drying dehydration device is used, and compared with the traditional mechanical dehydration, the sludge naturally drying dehydration device can reduce the energy consumption and reduce the treatment cost of wastewater.
Further, after the pretreated coagulation tank supernatant conveyed by the wastewater lift pump II and the enterprise workshop domestic sewage are subjected to flow regulation and homogeneous mixing in the mixing tank, the mixed water body is conveyed to the bottom of a hydrolysis acidification tank in the combined biochemical tank through the wastewater lift pump III, and then is sequentially treated by the hydrolysis acidification tank, the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank, and clear water in the sedimentation tank can be discharged outwards after reaching the standard;
the specific steps of treating the mixed water body by a hydrolysis acidification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank are as follows:
the method comprises the following steps: the mixed water body is subjected to anaerobic hydrolysis reaction in a hydrolysis acidification tank, macromolecular organic matters in the water body are decomposed into micromolecular organic matters under the action of anaerobic bacteria such as hydrolytic bacteria, hydrogen-producing acetogenic bacteria and the like, the hydrolysis acidification tank can improve the overall biodegradability of the mixed water body and remove 10-30% of the amount of pollutants needing to be oxidized and reduced in the water body, and the hydraulic retention time HRT of the mixed water body in the hydrolysis acidification tank is 10 hours;
step two: the water body after the reaction in the hydrolytic acidification tank enters an anaerobic tank, the water body carries out biological phosphorus removal reaction in the anaerobic tank, phosphorus-accumulating bacteria in the anaerobic tank can release phosphorus under the conditions of anaerobism and nutrient substances, the hydraulic retention time HRT of the water body in the anaerobic tank is 3 hours, and the dissolved oxygen in the anaerobic tank is controlled to be below 0.2 mg/L;
step three: the water body enters the anoxic tank after being subjected to biological phosphorus removal reaction in the anaerobic tank, denitrification reaction is carried out on the water body in the anoxic tank, denitrifying bacteria in the anoxic tank can convert nitrate nitrogen and nitrite nitrogen into nitrogen, nitrogen-containing pollutants in the water body in the anoxic tank are further removed, the hydraulic retention time HRT of the water body in the anoxic tank is 4 hours, and dissolved oxygen in the anoxic tank is controlled to be below 0.5 mg/L;
step four: the water body after denitrification reaction in the anoxic tank enters an aerobic tank, nitrification reaction and aerobic oxidation reaction are carried out in the aerobic tank, ammonia nitrogen in the water body in the aerobic tank is oxidized into nitrate nitrogen and nitrite nitrogen, organic matters in the water body in the aerobic tank are oxidized into carbon dioxide and water, the hydraulic retention time HRT of the water body in the aerobic tank is 20 hours, the dissolved oxygen in the aerobic tank is controlled within the range of 2-4 mg/L, and the MBBR filler filling rate in the middle part of the aerobic tank is 30%;
step five: the water body treated by the aerobic tank enters the sedimentation tank through the aerobic tank water outlet, activated sludge in the water body in the sedimentation tank is separated from treated clean water, part of activated sludge in the sedimentation tank can flow back into the anaerobic tank, the other part of residual sludge in the sedimentation tank can be discharged into the sludge drying tank through the sludge discharge pipeline assembly to be dried and then treated, the clean water in the sedimentation tank can be discharged outwards after reaching the standard, and the force retention time HRT of the water body in the sedimentation tank is 5 hours.
Compared with the prior art, the invention has the following beneficial effects:
the integrated sewage treatment system for mixed wastewater is manufactured by integrally and comprehensively optimizing and combining a wastewater collecting tank, a pretreatment coagulation tank, a sludge drying tank, a pretreatment collecting tank, a mixing tank, a combined biochemical tank, a hydrolysis acidification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank in the combined biochemical tank, and device components, medicines and seasonings which are matched with the tanks. The mixed wastewater integrated sewage treatment system can solve the following problems in the process of treating paint spraying wastewater and cleaning agent wastewater: 1) the paint spraying wastewater and the cleaning agent wastewater are treated by a single physical and chemical method, the treated effluent cannot reach the standard, and the whole operation treatment cost is high; 2) the paint spraying wastewater and the cleaning agent wastewater lack enough nutrient substances, have poor biodegradability and are difficult to be further treated by a biochemical method. The method can also solve the problems that the paint spraying wastewater and the cleaning agent wastewater are difficult to treat, high in cost and poor in biodegradability, C, N, P and other nutrients in domestic wastewater generated in the production and life processes of industrial workshop workers are sufficient, the B/C value (biodegradability) is high, and the biodegradability is good.
Meanwhile, the system disclosed by the invention is compact in structure, small in occupied area, low in energy consumption, low in medicament use cost, low in overall comprehensive treatment cost, strong in flexibility, good in operation stability, capable of solving the problems that the paint spraying wastewater and the cleaning agent wastewater are difficult to treat, the biodegradability of the paint spraying wastewater and the cleaning agent wastewater is poor in treatment process, the effluent is not up to standard and the treatment cost is high, and suitable for being popularized and used in mixed treatment of the paint spraying wastewater, the cleaning agent wastewater and domestic sewage.
Drawings
FIG. 1 is a schematic top view of the system of the present invention;
FIG. 2 is a schematic front view of the present invention taken along the vertical direction A-A;
FIG. 3 is a schematic top view of the hydrolysis acidification tank, the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank in the mixing tank and the combined biochemical tank when the system of the present invention is in use.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail with reference to examples and specific embodiments.
Referring to the attached drawings, the mixed wastewater integrated sewage treatment system is characterized by comprising a wastewater collecting tank 2, a pretreatment coagulation tank 4, a sludge drying tank 25, a pretreatment collecting tank 3, a mixing tank 7 and a combined biochemical tank, wherein the combined biochemical tank comprises a hydrolysis acidification tank 8, an anaerobic tank 10, an anoxic tank 9, an aerobic tank 11 and a sedimentation tank 12, paint spraying wastewater and cleaning agent wastewater are conveyed into the wastewater collecting tank 2 through a wastewater pipe network, are subjected to flow regulation and homogenization treatment in the wastewater collecting tank 2 and then conveyed into the pretreatment coagulation tank 4 through a wastewater lifting pump 6, are subjected to coagulation and precipitation pretreatment in the pretreatment coagulation tank 4 to remove most organic matters and suspended matters in the wastewater, sludge in the pretreatment coagulation tank 4 is discharged into the sludge tank 25 to be dried and dehydrated, and dried supernatant in the pretreatment coagulation tank 4 flows into the pretreatment collecting tank 3 through a pipeline, after the pretreatment water collecting tank 3 is treated, the supernatant of the pretreatment water collecting tank 3 is conveyed into a mixing tank 7 through a wastewater lifting pump II 5 to be mixed with domestic sewage, the mixed water body is conveyed into a combined biochemical tank through a wastewater lifting pump III 18, and is finally discharged after reaching the standard after being treated by a hydrolysis acidification tank 8, an anaerobic tank 10, an anoxic tank 9, an aerobic tank 11 and a sedimentation tank 12 in sequence, a stirrer 22 is arranged at the upper part in the pretreatment coagulation tank 4, the lower part of the pretreatment coagulation tank 4 is funnel-shaped, a sludge discharge pipeline 23 is arranged at the bottom of the funnel-shaped lower part of the pretreatment coagulation tank 4, a sludge discharge valve 24 is arranged on the sludge discharge pipeline 23, a sludge drying tank 25 is arranged below the sludge discharge pipeline 23, the whole pretreatment coagulation tank 4 is positioned above the sludge drying tank 25, the supernatant of the pretreatment coagulation tank 4 flows into the pretreatment water collecting tank 3 through a pipeline, and a clean water valve 20 is arranged on the pipeline through which the supernatant flows, a domestic sewage inlet pipe assembly 19 is arranged at the upper part of the mixing tank 7, domestic sewage enters the mixing tank 7 through the domestic sewage inlet pipe assembly 19, the domestic sewage is mixed with the supernatant of the pretreatment coagulation tank 4 conveyed by the wastewater lift pump II 5 in the mixing tank 7, the mixed water is conveyed to the bottom of the hydrolysis acidification tank 8 in the combined biochemical tank through the wastewater lift pump III 18, a water distribution pipe 17 is arranged at the bottom of the hydrolysis acidification tank 8, a suspended filler is arranged at the middle part of the hydrolysis acidification tank 8, the mixed water enters the hydrolysis acidification tank 8 after being distributed by the water distribution pipe 17 at the bottom of the hydrolysis acidification tank 8, the water enters the anaerobic tank 10 after being subjected to anaerobic hydrolysis reaction in the hydrolysis acidification tank 8, a submersible stirrer is arranged in the anaerobic tank 10, phosphorus accumulating bacteria are arranged in the anaerobic tank 10, and can perform phosphorus releasing on the water in the anaerobic tank 10 under the anaerobic and nutrient substance condition, the water body enters an anoxic tank 9 after biological phosphorus removal reaction in an anaerobic tank 10, a submersible stirrer is arranged in the anoxic tank 9, denitrifying bacteria are arranged in the anoxic tank 9, the water body can remove nitrogen pollutants in the water body after undergoing denitrification reaction in the anoxic tank 9, the water body after undergoing denitrification reaction in the anoxic tank 9 enters an aerobic tank 11, an aerator pipe 15 is arranged at the bottom of the aerobic tank 11, MBBR filler is arranged at the middle part of the aerobic tank 11, a water outlet is arranged at one side of the aerobic tank 11, a filter screen 21 is arranged at the water outlet of the aerobic tank 11, the MBBR filler in the aerobic tank 11 can be intercepted by the filter screen 21, the water body undergoes nitrification reaction and aerobic oxidation reaction in the aerobic tank 11, ammonia nitrogen in the water body is oxidized into nitrate nitrogen and nitrite nitrogen, organic matters in the water body are oxidized into carbon dioxide and water, the water body treated by the aerobic tank 11 enters a sedimentation tank 12 through the water outlet of the aerobic tank 11, activated sludge in the water in the sedimentation tank 12 can be separated from clear water after sedimentation treatment, in the anaerobic tank 10 can flow back to some activated sludge in the sedimentation tank 12, another part excess sludge in the sedimentation tank 12 can be arranged to the sludge drying tank 25 through the mud discharge pipeline 23 assembly and then disposed after drying, and clear water in the sedimentation tank 12 can be discharged outwards after reaching the standard.
Further, a gas stripping nitrifying liquid reflux device 14 is arranged at the upper part in the aerobic tank 11, the gas stripping nitrifying liquid reflux device 14 can reflux nitrifying liquid after the nitrification reaction in the aerobic tank 11 to the anoxic tank 9, and the nitrifying liquid is a water body containing nitrate nitrogen and nitrite nitrogen;
the upper part in the sedimentation tank 12 is provided with a gas-stripping sludge reflux device 13, and the gas-stripping sludge reflux device 13 can reflux the activated sludge in the sedimentation tank 12 into the anaerobic tank 10;
the escalator 1 is arranged on the side surfaces of the wastewater collecting tank 2, the pretreatment coagulating tank 4 and the pretreatment collecting tank 3.
Further, after the paint spraying wastewater and the cleaning agent wastewater are subjected to flow regulation and homogenization treatment in the wastewater collection tank 2, the paint spraying wastewater and the cleaning agent wastewater are conveyed into the pretreatment coagulation tank 4 through a wastewater lift pump 6, sodium hydroxide NaOH, polyaluminium chloride PAC and anionic polyacrylamide PAM medicines are sequentially added into the pretreatment coagulation tank 4 to perform pretreatment coagulation reaction, and the specific operation steps are as follows:
the method comprises the following steps: the stirrer 22 at the upper part in the pretreatment coagulation tank 4 is started, so that the subsequent wastewater and the medicines can be fully mixed;
step two: adding a sodium hydroxide NaOH drug with the concentration of 10% into the pretreatment coagulation tank 4, and adjusting the pH value of the mixed wastewater in the pretreatment coagulation tank 4 to be within the range of 8-9;
step three: adding a polyaluminium chloride PAC medicine with the concentration of 5% into the mixed wastewater in the pretreatment coagulation tank 4, wherein the adding amount of the polyaluminium chloride PAC medicine is controlled within the range of 20-50 mg/L, and the polyaluminium chloride PAC medicine can be used as a coagulant to remove most of suspended pollutants (such as paint colloid and the like) in the mixed wastewater in the pretreatment coagulation tank 4;
step four: adding 0.5% of anionic polyacrylamide PAM (polyacrylamide) medicine into the mixed wastewater in the pretreatment coagulation basin 4, controlling the adding amount of the anionic polyacrylamide PAM medicine within the range of 2-5 mg/L, wherein the anionic polyacrylamide PAM medicine can be used as a coagulant aid to form a large-size flocculent substance through a bridge frame and adsorption action, the anionic polyacrylamide PAM medicine can increase the precipitation rate of pollutants in the mixed wastewater in the pretreatment coagulation basin 4, and the anionic polyacrylamide PAM medicine can improve the removal effect of the pollutants in the mixed wastewater in the pretreatment coagulation basin 4;
step five: after the mixed wastewater in the pretreatment coagulation tank 4 is sequentially treated in the first step to the fourth step and the subsequent time lasts for 1-2 hours, opening a sludge discharge valve 24 on a sludge discharge pipeline 23 at the lower part of the pretreatment coagulation tank 4 to discharge solid precipitates such as sludge, paint slag and the like in the pretreatment coagulation tank 4 into a sludge drying tank 25 below the pretreatment coagulation tank 4 through the sludge discharge pipeline 23, wherein the solid precipitates such as the sludge, the paint slag and the like can be naturally concentrated and dehydrated in the sludge drying tank 25, so that the water content and the volume of the solid precipitates are reduced, and the post-treatment cost of the solid precipitates such as sludge is reduced;
step six: the supernatant in the pretreatment coagulation tank 4 flows into the pretreatment water collecting tank 3 through a pipeline, the supernatant flows through a clean water valve 20 on the pipeline after being opened, and then the supernatant in the pretreatment coagulation tank 4 enters the pretreatment water collecting tank 3 through the clean water valve 20.
Further, a sludge natural drying dehydration device 26 is arranged in the sludge drying tank 25 below the pretreatment coagulation tank 4, the water content of solid precipitates such as sludge and paint slag in the device can be reduced to 60% by the sludge natural drying dehydration device 26, a dehydration medicament does not need to be added in the sludge natural drying dehydration device 26, and the sludge natural drying dehydration device 26 does not need to be added with electric energy when in use, and compared with the traditional mechanical dehydration, the sludge natural drying dehydration device 26 can reduce the energy consumption and reduce the treatment cost of wastewater.
Furthermore, after the supernatant of the pretreatment coagulation tank 4 conveyed by the wastewater lift pump II 5 and the domestic sewage of the enterprise workshop are subjected to flow regulation and homogeneous mixing in the mixing tank 7, the mixed water body is conveyed to the bottom of the hydrolysis acidification tank 8 in the combined biochemical tank through the wastewater lift pump III 18, and then is sequentially treated by the hydrolysis acidification tank 8, the anaerobic tank 10, the anoxic tank 9, the aerobic tank 11 and the sedimentation tank 12, and the clear water in the sedimentation tank 12 can be discharged outwards after reaching the standard;
the concrete steps of treating the mixed water body by a hydrolysis acidification tank 8, an anaerobic tank 10, an anoxic tank 9, an aerobic tank 11 and a sedimentation tank 12 are as follows:
the method comprises the following steps: the mixed water body is subjected to anaerobic hydrolysis reaction in the hydrolysis acidification tank 8, macromolecular organic matters in the water body are decomposed into small molecular organic matters under the action of anaerobic bacteria such as hydrolytic bacteria, hydrogen-producing acetogenic bacteria and the like, the hydrolysis acidification tank 8 can improve the overall biochemical performance of the mixed water body and remove 10-30% of the amount of pollutants needing to be oxidized and reduced in the water body, and the hydraulic retention time HRT of the mixed water body in the hydrolysis acidification tank 8 is 10 hours;
step two: the water body after the reaction in the hydrolysis acidification tank 8 enters an anaerobic tank 10, the water body performs biological phosphorus removal reaction in the anaerobic tank 10, phosphorus-accumulating bacteria in the anaerobic tank 10 can release phosphorus under the conditions of anaerobism and nutrient substances, the hydraulic retention time HRT of the water body in the anaerobic tank 10 is 3 hours, and the dissolved oxygen in the anaerobic tank 10 is controlled to be below 0.2 mg/L;
step three: the water body enters the anoxic tank 9 after being subjected to biological phosphorus removal reaction in the anaerobic tank 10, the water body is subjected to denitrification reaction in the anoxic tank 9, denitrifying bacteria in the anoxic tank 9 can convert nitrate nitrogen and nitrite nitrogen into nitrogen, nitrogen-containing pollutants in the water body in the anoxic tank 9 are removed, the hydraulic retention time HRT of the water body in the anoxic tank 9 is 4 hours, and dissolved oxygen in the anoxic tank 9 is controlled to be below 0.5 mg/L;
step four: the water body after the denitrification reaction in the anoxic tank 9 enters the aerobic tank 11, the nitrification reaction and the aerobic oxidation reaction are carried out in the aerobic tank 11, ammonia nitrogen in the water body in the aerobic tank 11 is oxidized into nitrate nitrogen and nitrite nitrogen, organic matters in the water body in the aerobic tank 11 are oxidized into carbon dioxide and water, the hydraulic retention time HRT of the water body in the aerobic tank 11 is 20 hours, the dissolved oxygen in the aerobic tank 11 is controlled within the range of 2-4 mg/L, and the MBBR filler filling rate in the middle part of the aerobic tank 11 is 30%;
step five: the water body treated by the aerobic tank 11 enters the sedimentation tank 12 through a water outlet of the aerobic tank 11, activated sludge in the water body in the sedimentation tank 12 is separated from treated clean water, a part of activated sludge in the sedimentation tank 12 can flow back into the anaerobic tank 10, the other part of residual sludge in the sedimentation tank 12 can be discharged into the sludge drying tank 25 through the sludge discharge pipeline 23 component for drying and disposal, the clean water in the sedimentation tank 12 can be discharged outwards after reaching the standard, and the force retention time HRT of the water body in the sedimentation tank 12 is 5 hours.
When the invention is actually used, the invention can solve the following problems when treating the paint spraying wastewater and the cleaning agent wastewater: 1) the paint spraying wastewater and the cleaning agent wastewater are treated by a single physical and chemical method, the treated effluent cannot reach the standard, and the whole operation treatment cost is high; 2) the paint spraying wastewater and the cleaning agent wastewater lack enough nutrient substances, have poor biodegradability and are difficult to be further treated by a biochemical method. The method can also solve the problems that the paint spraying wastewater and the cleaning agent wastewater are difficult to treat, high in cost and poor in biodegradability, C, N, P and other nutrients in domestic wastewater generated in the production and life processes of industrial workshop workers are sufficient, the B/C value (biodegradability) is high, and the biodegradability is good.
Meanwhile, the system disclosed by the invention is compact in structure, small in occupied area, low in energy consumption, low in medicament use cost, low in overall comprehensive treatment cost, strong in flexibility, good in operation stability, capable of solving the problems that the paint spraying wastewater and the cleaning agent wastewater are difficult to treat, the biodegradability of the paint spraying wastewater and the cleaning agent wastewater is poor in treatment process, the effluent is not up to standard and the treatment cost is high, and suitable for being popularized and used in mixed treatment of the paint spraying wastewater, the cleaning agent wastewater and domestic sewage.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (5)
1. A mixed wastewater integrated sewage treatment system is characterized by comprising a wastewater collecting tank, a pretreatment coagulation tank, a sludge drying tank, a pretreatment collecting tank, a mixing tank and a combined biochemical tank, wherein the combined biochemical tank comprises a hydrolysis acidification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, paint spraying wastewater and cleaning agent wastewater are conveyed into the wastewater collecting tank through a wastewater pipe network, after flow regulation and homogenization treatment are carried out in the wastewater collecting tank, the paint spraying wastewater and the cleaning agent wastewater are conveyed into the pretreatment coagulation tank through a wastewater lifting pump I, after coagulation and sedimentation pretreatment in the pretreatment coagulation tank, most organic matters and suspended matters in the wastewater are removed, sludge in the pretreatment coagulation tank is discharged into the sludge drying tank for drying and dehydration treatment, supernatant in the pretreatment coagulation tank flows into the pretreatment collecting tank through a pipeline, after the pretreatment collecting tank is treated, the supernatant in the pretreatment collecting tank is conveyed into the mixing tank through a wastewater lifting pump II to be mixed with domestic sewage, the water after mixing is carried to the combination biochemical pond through waste water elevator pump three in proper order, and finally after handling through hydrolysis acidification pool, anaerobism pond, oxygen deficiency pond, good oxygen pond and sedimentation tank up to standard, outwards discharge after reaching standard, there is the agitator upper portion in the preliminary treatment coagulating basin, preliminary treatment coagulating basin lower part is hourglass hopper-shaped, there is a mud pipe in the bottom of preliminary treatment coagulating basin hourglass hopper-shaped lower part, is equipped with the mud valve above the mud pipe, there is sludge drying tank below the mud pipe, and preliminary treatment coagulating basin wholly is located sludge drying tank top, the supernatant of preliminary treatment coagulating basin is in the pipeline inflow preliminary treatment catchment pond of flowing through, is equipped with the clear water valve on the pipeline that the supernatant flows through, mixing tank upper portion is equipped with domestic sewage inlet pipe assembly, and domestic sewage gets into mixing tank through domestic sewage inlet pipe assembly, and domestic sewage mix in mixing tank with the preliminary treatment coagulating basin supernatant through waste water elevator pump two transport, the mixed water body is conveyed to the bottom of a hydrolysis acidification pool in a combined biochemical pool through a wastewater lifting pump III, a water distribution pipe is arranged at the bottom of the hydrolysis acidification pool, a suspended filler is arranged in the middle of the hydrolysis acidification pool, the mixed water body enters the hydrolysis acidification pool after being distributed through the water distribution pipe at the bottom of the hydrolysis acidification pool, the water body enters an anaerobic pool after undergoing anaerobic hydrolysis reaction in the hydrolysis acidification pool, a submersible stirrer is arranged in the anaerobic pool, phosphorus accumulating bacteria are arranged in the anaerobic pool, the phosphorus accumulating bacteria can release phosphorus to the water body in the anaerobic pool under the conditions of anaerobism and nutrient substances, the water body enters an anoxic pool after undergoing biological phosphorus removal reaction in the anaerobic pool, a submersible stirrer is arranged in the anoxic pool, denitrifying bacteria are arranged in the anoxic pool, the water body can be subjected to denitrification reaction in the anoxic pool so as to remove nitrogen pollutants in the water body, and the water body after undergoing denitrification reaction in the anoxic pool enters an aerobic pool, the bottom of the aerobic tank is provided with an aerator pipe, the middle part of the aerobic tank is provided with an MBBR filler, one side of the aerobic tank is provided with a water outlet, a filter screen is arranged at the water outlet of the aerobic tank and can intercept the MBBR filler in the aerobic tank, a water body generates nitration reaction and aerobic oxidation reaction in the aerobic tank, ammonia nitrogen in the water body is oxidized into nitrate nitrogen and nitrite nitrogen, organic matters in the water body are oxidized into carbon dioxide and water, the water body treated by the aerobic tank enters a sedimentation tank through the water outlet of the aerobic tank, activated sludge in the water in the sedimentation tank can be separated from clear water after sedimentation treatment, and a part of activated sludge in the sedimentation tank can flow back to the anaerobism pond, and another part of excess sludge in the sedimentation tank can be arranged to the sludge drying pond through arranging mud pipe assembly and handle after drying, and the clear water in the sedimentation tank can be discharged outside after reaching standard.
2. The integrated sewage treatment system of claim 1, wherein the upper part of the aerobic tank is provided with a gas stripping nitrification liquid reflux device, the gas stripping nitrification liquid reflux device can reflux nitrification liquid after nitrification reaction in the aerobic tank to the anoxic tank, and the nitrification liquid is a water body containing nitrate nitrogen and nitrite nitrogen;
the upper part in the sedimentation tank is provided with a gas stripping sludge reflux device which can reflux the activated sludge in the sedimentation tank into the anaerobic tank;
and escalators are arranged on the side surfaces of the wastewater collecting tank, the pretreatment coagulation tank and the pretreatment collecting tank.
3. The integrated mixed wastewater sewage treatment system according to claim 1 or 2, wherein the paint spraying wastewater and the cleaning agent wastewater are conveyed into a pretreatment coagulation tank through a first wastewater lift pump after being subjected to flow regulation and homogenization treatment in a wastewater collection tank, and sodium hydroxide (NaOH), polyaluminium chloride (PAC) and anionic Polyacrylamide (PAM) medicines are sequentially added into the pretreatment coagulation tank for pretreatment coagulation reaction, and the specific operation steps are as follows:
the method comprises the following steps: starting a stirrer at the upper part in the pretreatment coagulation tank, so that the subsequent wastewater and the medicines can be fully mixed;
step two: adding a sodium hydroxide NaOH drug with the concentration of 10% into the pretreatment coagulation tank, and adjusting the pH value of the mixed wastewater in the pretreatment coagulation tank to be within the range of 8-9;
step three: adding a polyaluminum chloride PAC medicine with the concentration of 5% into the mixed wastewater in the pretreatment coagulation tank, wherein the adding amount of the polyaluminum chloride PAC medicine is controlled within the range of 20-50 mg/L, and the polyaluminum chloride PAC medicine can be used as a coagulant to remove most suspended pollutants in the mixed wastewater in the pretreatment coagulation tank;
step four: adding 0.5% of anionic polyacrylamide PAM (polyacrylamide) medicine into the mixed wastewater in the pretreatment coagulation tank, wherein the adding amount of the anionic polyacrylamide PAM medicine is controlled within the range of 2-5 mg/L, and the anionic polyacrylamide PAM medicine can be used as a coagulant aid to form a large-size flocculent substance through bridge and adsorption;
step five: after the mixed wastewater in the pretreatment coagulation tank is sequentially treated in the first step to the fourth step and the subsequent time lasts for 1-2 hours, opening a sludge discharge valve on a sludge discharge pipeline at the lower part of the pretreatment coagulation tank, so that solid precipitates such as sludge, paint slag and the like in the pretreatment coagulation tank are discharged into a sludge drying tank below the pretreatment coagulation tank through the sludge discharge pipeline, and the solid precipitates such as the sludge, the paint slag and the like can be naturally concentrated and dehydrated in the sludge drying tank;
step six: and the supernatant in the pretreatment coagulation tank flows into the pretreatment water collecting tank through a pipeline, the supernatant flows through a clean water valve on the pipeline after being opened, and then the supernatant in the pretreatment coagulation tank enters the pretreatment water collecting tank through the clean water valve.
4. The integrated sewage treatment system of claim 3, wherein a sludge natural drying dehydration device is installed in the sludge drying tank below the pretreatment coagulation tank, and the water content of solid precipitates such as sludge and paint slag entering the sludge natural drying dehydration device can be reduced to 60%.
5. The integrated mixed wastewater treatment system according to any one of claims 1 to 4, wherein after the supernatant of the pre-treatment coagulation tank conveyed by the wastewater lift pump II and the domestic wastewater of the enterprise workshop are subjected to flow regulation and homogeneous mixing in the mixing tank, the mixed water body is conveyed to the bottom of the hydrolysis acidification tank in the combined biochemical tank by the wastewater lift pump III, and then is sequentially treated by the hydrolysis acidification tank, the anaerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank, and the clear water in the sedimentation tank can be discharged outwards after reaching the standard;
the specific steps of treating the mixed water body by a hydrolysis acidification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank are as follows:
the method comprises the following steps: the mixed water body is subjected to anaerobic hydrolysis reaction in a hydrolysis acidification tank, macromolecular organic matters in the water body are decomposed into micromolecular organic matters under the action of anaerobic bacteria such as hydrolytic bacteria, hydrogen-producing acetogenic bacteria and the like, the hydrolysis acidification tank can improve the overall biodegradability of the mixed water body and remove 10-30% of the amount of pollutants needing to be oxidized and reduced in the water body, and the hydraulic retention time HRT of the mixed water body in the hydrolysis acidification tank is 10 hours;
step two: the water body after the reaction in the hydrolytic acidification tank enters an anaerobic tank, the water body carries out biological phosphorus removal reaction in the anaerobic tank, phosphorus-accumulating bacteria in the anaerobic tank can release phosphorus under the conditions of anaerobism and nutrient substances, the hydraulic retention time HRT of the water body in the anaerobic tank is 3 hours, and the dissolved oxygen in the anaerobic tank is controlled to be below 0.2 mg/L;
step three: the water body enters the anoxic tank after being subjected to biological phosphorus removal reaction in the anaerobic tank, denitrification reaction is carried out on the water body in the anoxic tank, denitrifying bacteria in the anoxic tank can convert nitrate nitrogen and nitrite nitrogen into nitrogen, nitrogen-containing pollutants in the water body in the anoxic tank are further removed, the hydraulic retention time HRT of the water body in the anoxic tank is 4 hours, and dissolved oxygen in the anoxic tank is controlled to be below 0.5 mg/L;
step four: the water body after denitrification reaction in the anoxic tank enters an aerobic tank, nitrification reaction and aerobic oxidation reaction are carried out in the aerobic tank, ammonia nitrogen in the water body in the aerobic tank is oxidized into nitrate nitrogen and nitrite nitrogen, organic matters in the water body in the aerobic tank are oxidized into carbon dioxide and water, the hydraulic retention time HRT of the water body in the aerobic tank is 20 hours, the dissolved oxygen in the aerobic tank is controlled within the range of 2-4 mg/L, and the MBBR filler filling rate in the middle part of the aerobic tank is 30%;
step five: the water body treated by the aerobic tank enters the sedimentation tank through the aerobic tank water outlet, activated sludge in the water body in the sedimentation tank is separated from treated clean water, part of activated sludge in the sedimentation tank can flow back into the anaerobic tank, the other part of residual sludge in the sedimentation tank can be discharged into the sludge drying tank through the sludge discharge pipeline assembly to be dried and then treated, the clean water in the sedimentation tank can be discharged outwards after reaching the standard, and the force retention time HRT of the water body in the sedimentation tank is 5 hours.
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| CN202011494584.4A CN112551817A (en) | 2020-12-17 | 2020-12-17 | Mixed wastewater integrated sewage treatment system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735383A (en) * | 2021-09-24 | 2021-12-03 | 江苏徐工工程机械研究院有限公司 | Multifunctional integrated sewage treatment system and method |
| CN114538706A (en) * | 2022-02-23 | 2022-05-27 | 江苏新裕泰华环保集团有限公司 | Wastewater treatment device for polycrystalline silicon production and use method thereof |
| CN116282771A (en) * | 2023-05-16 | 2023-06-23 | 中国市政工程华北设计研究总院有限公司 | Village sewage treatment system and treatment process with suspended filler as core |
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2020
- 2020-12-17 CN CN202011494584.4A patent/CN112551817A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735383A (en) * | 2021-09-24 | 2021-12-03 | 江苏徐工工程机械研究院有限公司 | Multifunctional integrated sewage treatment system and method |
| CN114538706A (en) * | 2022-02-23 | 2022-05-27 | 江苏新裕泰华环保集团有限公司 | Wastewater treatment device for polycrystalline silicon production and use method thereof |
| CN116282771A (en) * | 2023-05-16 | 2023-06-23 | 中国市政工程华北设计研究总院有限公司 | Village sewage treatment system and treatment process with suspended filler as core |
| CN116282771B (en) * | 2023-05-16 | 2023-08-08 | 中国市政工程华北设计研究总院有限公司 | Village sewage treatment system and treatment process with suspended filler as core |
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