CN111003888A - Treatment method of chemical wastewater of dead pigs - Google Patents
Treatment method of chemical wastewater of dead pigs Download PDFInfo
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- CN111003888A CN111003888A CN201911321503.8A CN201911321503A CN111003888A CN 111003888 A CN111003888 A CN 111003888A CN 201911321503 A CN201911321503 A CN 201911321503A CN 111003888 A CN111003888 A CN 111003888A
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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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- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/44—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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
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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
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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
- C02F3/02—Aerobic 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
- C02F3/28—Anaerobic digestion 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
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention relates to the technical field of sewage treatment, in particular to a method for treating chemical wastewater of pigs died of diseases, which comprises a water collecting tank, an adjusting tank, an anaerobic tank, a facultative tank, an aerobic tank, an MBR (membrane bioreactor) membrane tank, a DTRO (digital terrestrial ro) reverse osmosis membrane group and a multi-effect evaporator, and comprises the following specific steps: s1, collecting waste water; firstly, physically filtering wastewater generated in the whole process of the chemical production of pigs died of diseases, then injecting the filtered wastewater into an oil-water separator for oil-water separation, injecting the wastewater subjected to oil-water separation into a water collecting tank through a sewage pump, and collecting the wastewater; s2, primary processing: after the wastewater in the S1 is collected in the water collecting tank, the inside of the water collecting tank is pumped into the regulating tank through the sewage pump to obtain stable neutralized wastewater, the invention overcomes the difficult problem that the traditional biochemical method and A2O-MBR equipment are difficult to treat due to the characteristics of high ammonia nitrogen and high salt of the wastewater of pigs died of diseases through design, combines the DTRO reverse osmosis process, has relatively simple flow and achieves the purpose of treating the wastewater up to the standard.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating chemical wastewater of pigs died of diseases.
Background
In recent years, along with the large-scale and standardized development of live pig breeding, the harmless treatment of pigs died of diseases is increasingly concerned by governments and the public due to the sustainable development of agriculture and the microbial safety of public environments, and at present, the harmless treatment process of pigs died of diseases is mainly divided into incineration, chemical treatment, chemical hydrolysis, high-temperature biological degradation and the like. The chemical preparation method is simple to operate, high in treatment speed and high in efficiency, is a common treatment process for pigs died of diseases, and specifically comprises the steps of mechanically crushing the pigs died of diseases, cooking at high temperature and high pressure, and carrying out solid-liquid separation and oil-water separation to obtain meat and bone meal, grease and wastewater.
The content of organic matters, ammonia nitrogen and salt in the chemical wastewater of pigs dead of diseases is high, the wastewater is not easy to treat, the traditional biological treatment is difficult to discharge up to the standard, a membrane bioreactor, abbreviated as MBR technology, utilizes a membrane component to replace a secondary sedimentation tank in the traditional activated sludge process, improves the solid-liquid separation efficiency, increases the sludge retention time, can enhance the sewage treatment effect, but the ammonia nitrogen in the effluent still greatly exceeds the discharge standard aiming at the chemical wastewater of pigs dead of diseases. The reverse osmosis membrane can intercept almost all dissolved matters except water molecules, can effectively remove pollutants such as ammonia nitrogen, COD (chemical oxygen demand), salt and the like in the wastewater, but the high-concentration organic wastewater can cause serious membrane pollution; an ultrafiltration membrane in the MBR system can be used as a pretreatment working section, so that a reverse osmosis membrane is protected, and membrane pollution is reduced. Therefore, MBR and DTRO technology can reach the standard to treat the chemical wastewater of pigs died of illness, and because the salinity in the wastewater is higher, the full-return reverse osmosis concentrated solution can inhibit the biochemical reaction of microorganisms, and the energy consumption for evaporating and crystallizing the concentrated solution is high.
In conclusion, the invention provides a method for treating chemical wastewater of pigs died of diseases to solve the existing problems.
Disclosure of Invention
The invention aims to provide a method for treating chemical wastewater of dead pigs, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a chemical wastewater treatment method for pigs died of diseases comprises a water collecting tank, an adjusting tank, an anaerobic tank, a facultative tank, an aerobic tank, an MBR (membrane bioreactor), a DTRO (digital terrestrial ro reverse osmosis) membrane group and a multi-effect evaporator, and comprises the following specific steps:
s1, collecting waste water; firstly, physically filtering wastewater generated in the whole process of the chemical production of pigs died of diseases, then injecting the filtered wastewater into an oil-water separator for oil-water separation, injecting the wastewater subjected to oil-water separation into a water collecting tank through a sewage pump, and collecting the wastewater;
s2, primary processing: after the wastewater in the S1 is collected in the water collecting tank, the inside of the water collecting tank is pumped into a regulating tank through a sewage pump, and stable neutral wastewater is obtained;
s3, biochemical treatment: the method comprises the following steps of (1) sequentially feeding neutralized wastewater S2 into an anaerobic tank, a facultative tank and an aerobic tank, and finally introducing into an MBR membrane tank;
s4, sludge treatment: returning partial sludge in the MBR membrane tank to the anaerobic biochemical tank through a sludge reflux pump, simultaneously discharging partial sludge into a sludge tank, and transporting the partial sludge to a sludge treatment unit for centralized treatment;
s5, injecting water generated by the MBR membrane tank into the DTRO reverse osmosis membrane group, and concentrating under a certain pressure to obtain reverse osmosis water and concentrated solution;
s6, partially refluxing the concentrated solution obtained in the step S5 to an anaerobic biochemical pool, partially evaporating and crystallizing by a multi-effect evaporator, and refluxing according to a reflux ratio, so that the chemical wastewater of pigs died of diseases can be completely treated until the chemical wastewater reaches the standard and is discharged, and the generated sludge and crystal salt are entrusted to qualified units for treatment.
Preferably, the anaerobic tank, the facultative tank, the aerobic tank, the MBR membrane tank, the reverse osmosis membrane module and the multi-effect evaporator are all arranged in an integrated device.
Preferably, the physical filtration in S1 is a vibrating screen.
Preferably, the reverse osmosis membrane module is a DTRO disc tube type reverse osmosis membrane.
Preferably, the concentration in S5 is 6-10 times under the pressure of 4-6 MPa.
Preferably, the reflux ratio in S6 is 0.5: 2.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with a biochemical treatment method, the method solves the problem that the chemical wastewater from pigs suffering from diseases is difficult to treat up to the standard, the produced water can reach the standard and be discharged, the advantages of all units (MBR, DTRO and multi-effect evaporation) in the process are combined, the defects of all units are avoided, the problem that the traditional biochemical method and A2O-MBR equipment are difficult to treat due to the characteristics of high ammonia nitrogen and high salt of the wastewater from pigs suffering from diseases is solved, the DTRO reverse osmosis process is combined, the process is relatively simple, and the wastewater can reach the standard and be treated.
Drawings
FIG. 1 is a schematic view of the process flow structure of the present invention.
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 embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
a chemical wastewater treatment method for pigs died of diseases comprises a water collecting tank, an adjusting tank, an anaerobic tank, a facultative tank, an aerobic tank, an MBR (membrane bioreactor), a DTRO (digital terrestrial ro reverse osmosis) membrane group and a multi-effect evaporator, and comprises the following specific steps:
s1, collecting waste water; firstly, physically filtering wastewater generated in the whole process of the chemical production of pigs died of diseases, then injecting the filtered wastewater into an oil-water separator for oil-water separation, injecting the wastewater subjected to oil-water separation into a water collecting tank through a sewage pump, and collecting the wastewater;
s2, primary processing: after the wastewater in the S1 is collected in the collecting tank, the inside of the collecting tank is pumped into an adjusting tank through a sewage pump to obtain stable neutralized wastewater, and the adjusting tank is used for adjusting the quality and quantity of water and ensuring the preliminary treatment of the subsequent working procedures;
s3, biochemical treatment: the method comprises the following steps of sequentially enabling neutralized wastewater S2 to enter an anaerobic tank, a facultative tank and an aerobic tank, and finally introducing into an MBR membrane tank, wherein the anaerobic tank is used for removing high-concentration organic wastewater and providing an aerobic treatment environment, the facultative tank is used for inhibiting growth of filamentous bacteria and preventing sludge from swelling and denitrifying, the aerobic tank is used for removing impurities in water through microbial metabolism, the MBR membrane tank is used for replacing a secondary sedimentation tank in the traditional activated sludge process by utilizing a membrane component, so that solid-liquid separation efficiency is improved, sludge retention time is prolonged, sewage treatment effect can be enhanced, an ultrafiltration membrane in an MBR system can be used as a pretreatment working section, a reverse osmosis membrane is protected, and membrane pollution is reduced;
s4, sludge treatment: returning partial sludge in the MBR membrane tank to the anaerobic biochemical tank through a sludge reflux pump, simultaneously discharging partial sludge into a sludge tank, and transporting the partial sludge to a sludge treatment unit for centralized treatment;
s5, injecting water generated by the MBR membrane tank into the DTRO reverse osmosis membrane group, and concentrating under a certain pressure to obtain reverse osmosis water and concentrated solution;
s6, partially refluxing the concentrated solution obtained in the step S5 to an anaerobic biochemical pool, partially evaporating and crystallizing by a multi-effect evaporator, and refluxing according to a reflux ratio, so that the chemical wastewater of pigs died of diseases can be completely treated until the chemical wastewater reaches the standard and is discharged, and the generated sludge and crystal salt are entrusted to qualified units for treatment.
The working process of the invention is as follows: as shown in figure 1, firstly, the wastewater generated in the whole process of the pig chemical production of dead pigs is physically filtered, then the filtered wastewater is injected into an oil-water separator for oil-water separation, the wastewater after oil-water separation is injected into a water collecting tank through a sewage pump and collected, after the wastewater is collected in the water collecting tank, the inside of the water collecting tank is pumped into the regulating tank through a sewage pump, the stable and neutral wastewater is obtained after being collected in the water collecting tank, enters a regulating tank 2, then sequentially enters an anaerobic tank, a facultative tank, an aerobic tank and an MBR membrane tank in the integrated equipment for solid-liquid separation, part of sludge returns to the anaerobic biochemical tank through a sludge reflux pump, part of sludge is discharged into the sludge tank and transported to a sludge treatment unit for centralized treatment, water produced by the MBR membrane tank continuously passes through a DTRO reverse osmosis membrane group, concentrating by 6-10 times under the pressure of 4-6MPa, and the reverse osmosis water production can meet the first-level discharge standard; part of concentrated solution flows back to an anaerobic biochemical tank, part of the concentrated solution is evaporated and crystallized by a multi-effect evaporator, the reflux ratio is 0.5-2, so that the waste water produced by the pig chemical processing of the dead pigs can be completely treated to reach the standard and discharged, the produced sludge and crystallized salt can be entrusted with qualified unit treatment, no secondary pollution risk exists, in the process, the adjusting tank is used for adjusting the water quality and water quantity and ensuring the initial treatment of the subsequent working procedure, the anaerobic tank is used for removing high-concentration organic waste water and providing an aerobic treatment environment, the facultative tank is used for inhibiting the growth of filamentous bacteria and preventing the sludge from expanding and denitrifying, the aerobic tank is used for removing impurities in water through the metabolism of microorganisms, the MBR membrane tank is used for replacing a secondary sedimentation tank in the traditional activated sludge method by utilizing a membrane component, the solid-liquid separation efficiency is improved, the sludge retention time is prolonged, the sewage treatment effect can be enhanced, and an ultrafiltration membrane in, the method has the advantages that the reverse osmosis membrane is protected, membrane pollution is reduced, so that the advantages of all units (MBR, DTRO and multi-effect evaporation) in the process are avoided, the defects of all units are overcome, the problem that the conventional biochemical method and A2O-MBR equipment are difficult to treat due to the characteristics of high ammonia nitrogen and high salt of the pig wastewater died of diseases is solved, the DTRO reverse osmosis process is combined, the process is relatively simple, and the sewage can reach the standard to be treated.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A chemical wastewater treatment method for pigs died of diseases comprises a water collecting tank, an adjusting tank, an anaerobic tank, a facultative tank, an aerobic tank, an MBR (membrane bioreactor), a DTRO (digital terrestrial ro reverse osmosis) membrane group and a multi-effect evaporator, and comprises the following specific steps:
s1, collecting waste water; firstly, physically filtering wastewater generated in the whole process of the chemical production of pigs died of diseases, then injecting the filtered wastewater into an oil-water separator for oil-water separation, injecting the wastewater subjected to oil-water separation into a water collecting tank through a sewage pump, and collecting the wastewater;
s2, primary processing: after the wastewater in the S1 is collected in the water collecting tank, the inside of the water collecting tank is pumped into a regulating tank through a sewage pump, and stable neutral wastewater is obtained;
s3, biochemical treatment: the method comprises the following steps of (1) sequentially feeding neutralized wastewater S2 into an anaerobic tank, a facultative tank and an aerobic tank, and finally introducing into an MBR membrane tank;
s4, sludge treatment: returning partial sludge in the MBR membrane tank to the anaerobic biochemical tank through a sludge reflux pump, simultaneously discharging partial sludge into a sludge tank, and transporting the partial sludge to a sludge treatment unit for centralized treatment;
s5, injecting water generated by the MBR membrane tank into the DTRO reverse osmosis membrane group, and concentrating under a certain pressure to obtain reverse osmosis water and concentrated solution;
s6, partially refluxing the concentrated solution obtained in the step S5 to an anaerobic biochemical pool, partially evaporating and crystallizing by a multi-effect evaporator, and refluxing according to a reflux ratio, so that the chemical wastewater of pigs died of diseases can be completely treated until the chemical wastewater reaches the standard and is discharged, and the generated sludge and crystal salt are entrusted to qualified units for treatment.
2. The method for treating the chemical wastewater from the pigs died of diseases according to claim 1, which is characterized in that: the anaerobic tank, the facultative tank, the aerobic tank, the MBR membrane tank, the reverse osmosis membrane module and the multi-effect evaporator are all installed in the integrated equipment.
3. The method for treating the chemical wastewater from the pigs died of diseases according to claim 1, which is characterized in that: and in the S1, the physical filtration is vibration screen screening.
4. The method for treating the chemical wastewater from the pigs died of diseases according to claim 1, which is characterized in that: the reverse osmosis membrane component is a DTRO disc tube type reverse osmosis membrane.
5. The method for treating the chemical wastewater from the pigs died of diseases according to claim 1, which is characterized in that: concentrating at 4-6MPa for 6-10 times in S5.
6. The method for treating the chemical wastewater from the pigs died of diseases according to claim 1, which is characterized in that: the reflux ratio in S6 was 0.5: 2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111470732A (en) * | 2020-05-12 | 2020-07-31 | 普洱致诚环保设备有限公司 | Rosin sewage treatment process |
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| CN111470732A (en) * | 2020-05-12 | 2020-07-31 | 普洱致诚环保设备有限公司 | Rosin sewage treatment process |
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