CN115304220A - Breeding wastewater treatment system and treatment method thereof - Google Patents
Breeding wastewater treatment system and treatment method thereof Download PDFInfo
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- CN115304220A CN115304220A CN202211002637.5A CN202211002637A CN115304220A CN 115304220 A CN115304220 A CN 115304220A CN 202211002637 A CN202211002637 A CN 202211002637A CN 115304220 A CN115304220 A CN 115304220A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 35
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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
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/52—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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- 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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- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention discloses a culture wastewater treatment system. The aquaculture wastewater treatment system comprises a sewage collection device, a solid-liquid separation device, a first coagulation sedimentation device, a separation liquid collection tank, a CSTR anaerobic reactor, a biogas slurry sedimentation tank, an ion air flotation device, an adjusting tank, an MBBR aerobic tank, a primary sedimentation tank, an AO reaction subsystem, a secondary sedimentation tank, a second coagulation sedimentation device, a clean water tank, an artificial wetland subsystem, a clean water channel and a sludge tank. The invention also discloses a treatment method of the aquaculture wastewater treatment system. The invention provides a system and a method for treating aquaculture wastewater, which can realize effective treatment of aquaculture wastewater, ensure that the treated water quality stably reaches the first comprehensive level of Integrated wastewater discharge Standard 8978-1996, and completely meet the requirements of standard discharge or recycling.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a cultivation wastewater treatment system and a treatment method thereof.
Background
The existing aquaculture wastewater has the typical characteristics of three high, namely high COD (chemical oxygen demand), high ammonia nitrogen, high suspended matters and the like of organic matter concentration, if the wastewater is directly discharged without effective treatment or discharged without reaching the standard, the surface water body is seriously polluted, and a black and odorous water body and a eutrophication water body are formed. For the treatment of the culture wastewater, although the conventional anaerobic biogas digester fermentation treatment can convert organic matters in the culture wastewater into methane for recycling, a large amount of biogas slurry generated after fermentation is difficult to biochemically treat due to insufficient carbon source, and the direct discharge can pollute the water environment; the physical-chemical treatment method needs complex equipment, has high operation and management cost and can generate secondary pollution; according to the traditional treatment method for the oxidation pond and the stabilization pond, raw water of the culture wastewater or biogas slurry after anaerobic fermentation is directly introduced into the oxidation pond, measures such as aeration and the like are assisted, the treatment time is long, the treatment effect is poor, odor is generated to pollute the surrounding environment, the ecological pond can be seriously silted and lose the treatment function after long-time operation, and pollutants permeate underground to pollute the underground water.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a culture wastewater treatment system and a treatment method thereof, which adopt multiple times of coagulating sedimentation treatment, CSTR anaerobic treatment and ion air flotation treatment, and are matched with MBBR aerobic treatment, AO reaction treatment and constructed wetland treatment to realize effective treatment on culture wastewater, so that the treated water quality stably reaches the first comprehensive level of Integrated wastewater discharge Standard 8978-1996, and the requirements of standard discharge or recycling are completely met.
The invention provides a culture wastewater treatment system, which comprises a sewage collection device, a solid-liquid separation device, a first coagulation sedimentation device, a separation liquid collection tank, a CSTR anaerobic reactor, a biogas slurry sedimentation tank, an ion floatation device, an adjusting tank, an MBBR aerobic tank, a primary sedimentation tank, an AO reaction subsystem, a secondary sedimentation tank, a second coagulation sedimentation device, a clean water tank, an artificial wetland subsystem, a clean water channel and a sludge tank, wherein the sewage collection device, the solid-liquid separation device, the first coagulation sedimentation device, the separation liquid collection tank, the CSTR anaerobic reactor, the biogas slurry sedimentation tank, the ion floatation device, the adjusting tank, the MBBR aerobic tank, the primary sedimentation tank, the AO reaction subsystem, the secondary sedimentation tank, the second coagulation sedimentation device, the clean water tank, the artificial wetland subsystem and the clean water channel are sequentially connected; the AO reaction subsystem comprises an anoxic tank, a first aerobic tank, a second aerobic tank and a third aerobic tank which are sequentially connected, the anoxic tank is connected with the primary sedimentation tank, the third aerobic tank is connected with the secondary sedimentation tank, and part of nitrified liquid in the third aerobic tank flows back to the anoxic tank; the first coagulation sedimentation device, the biogas slurry sedimentation tank, the primary sedimentation tank, the secondary sedimentation tank, the second coagulation sedimentation device and the clean water tank are respectively connected with the sludge tank, part of sludge in the primary sedimentation tank flows back to the MBBR aerobic tank, and part of sludge in the secondary sedimentation tank flows back to the anoxic tank; oxidation-reduction potentiometers are arranged in the CSTR anaerobic reactor, the MBBR aerobic tank, the anoxic tank and the first aerobic tank, and dissolved oxygen measuring instruments are also arranged in the anoxic tank and the first aerobic tank; and a PH meter, a COD (chemical oxygen demand) online monitor, an ammonia nitrogen online monitor and a total phosphorus online monitor are arranged in the clear water channel.
In a preferred embodiment of the aquaculture wastewater treatment system provided by the invention, the sewage collection device comprises a grid well and a water collection tank, sewage collected by a collection pipe network in the aquaculture farm enters the grid well for deslagging and then enters the water collection tank, and the water collection tank is connected with the solid-liquid separation device.
In a preferred embodiment of the aquaculture wastewater treatment system provided by the invention, the solid-liquid separation device comprises a vibrating screen solid-liquid separator and a rotating screen filter which are connected in sequence, the vibrating screen solid-liquid separator is connected with the wastewater collection device, and the rotating screen filter is connected with the first coagulating sedimentation device.
In a preferred embodiment of the aquaculture wastewater treatment system provided by the invention, the first coagulating sedimentation device and the second coagulating sedimentation device have the same structure, and comprise a dosing mixing tank and a dosing sedimentation tank, wherein the bottom of the dosing sedimentation tank is provided with an inclined plate.
In a preferred embodiment of the cultivation wastewater treatment system provided by the invention, aeration pipes are arranged in the MBBR aerobic tank, the first aerobic tank, the second aerobic tank and the third aerobic tank.
In a preferred embodiment of the cultivation wastewater treatment system provided by the invention, the water inlet of the CSTR anaerobic reactor is provided with an alkalinity meter.
In a preferred embodiment of the aquaculture wastewater treatment system provided by the invention, the aquaculture wastewater treatment system further comprises a black film pond, and the black film pond is respectively connected with the sewage collection device, the separation liquid collection pond and the AO reaction subsystem.
The invention also provides a treatment method of the aquaculture wastewater treatment system, which comprises the following steps:
step one, pretreatment: sewage collected by a collecting pipe network in the farm passes through the sewage collecting device and the solid-liquid separating device in sequence to remove suspended matters;
step two, carrying out primary coagulating sedimentation treatment: the pretreated sewage enters the first coagulating sedimentation device, is fully mixed with the added coagulation aiding substances in the first coagulating sedimentation device and then is subjected to precipitation separation, then the sewage after the first coagulating sedimentation treatment is discharged into the separation liquid collecting tank, and the precipitate enters the sludge tank;
step three, CSTR anaerobic treatment: pumping the sewage in the separation liquid collecting tank into the CSTR anaerobic reactor for anaerobic treatment, then discharging the sewage after the CSTR anaerobic treatment into the biogas slurry sedimentation tank for sedimentation, and feeding the sediment into the sludge tank;
step four, ion air flotation treatment: pumping the sewage in the biogas slurry sedimentation tank into the ion air floatation device for air floatation treatment, and then discharging the sewage subjected to the ion air floatation treatment into the adjusting tank;
step five, MBBR aerobic treatment: firstly, regulating the sewage in the regulating tank, then pumping the sewage into the MBBR aerobic tank for aerobic treatment, discharging the sewage subjected to the MBBR aerobic treatment into the primary sedimentation tank for sedimentation, returning part of sediment to the MBBR aerobic tank, and feeding the rest sediment into the sludge tank;
step six: AO reaction treatment: the AO reaction subsystem comprises an anoxic tank, a first aerobic tank, a second aerobic tank and a third aerobic tank which are connected in sequence, sewage in the primary sedimentation tank sequentially enters the anoxic tank, the first aerobic tank, the second aerobic tank and the third aerobic tank for treatment, part of nitrified liquid in the third aerobic tank flows back to the anoxic tank, then the sewage after AO reaction treatment enters the secondary sedimentation tank for sedimentation, part of sediment flows back to the anoxic tank, and the rest sediment enters the sludge tank;
step seven, carrying out second coagulating sedimentation treatment: pumping the sewage in the secondary sedimentation tank into the second coagulating sedimentation device, fully mixing the sewage with the added coagulation aiding substances in the second coagulating sedimentation device, carrying out sedimentation separation, then discharging the sewage after the secondary coagulating sedimentation treatment into the clean water tank, and enabling the sediment to enter the sludge tank; carrying out precipitation separation on the sewage in the clean water tank again, and enabling the precipitate to enter the sludge tank;
step eight, artificial wetland treatment: pumping the sewage in the clean water tank into the artificial wetland subsystem for treatment, and then discharging the sewage after the artificial wetland treatment into the clean water channel; and carrying out online monitoring on the sewage in the clear water channel, and discharging or recycling the sewage after reaching the standard.
In a preferred embodiment of the treatment method of the culture wastewater treatment system, the water inlet alkalinity of the CSTR anaerobic reactor is more than 100mg/l, the oxidation-reduction potential in the reactor is controlled to be-300 to-400 mV, the pH is controlled to be 6.8 to 7.2, and the feeding mode of the reactor adopts constant-temperature continuous feeding or semi-continuous feeding operation.
In a preferred embodiment of the treatment method of the culture wastewater treatment system provided by the invention, the oxidation-reduction potential in the MBBR aerobic tank is more than +200mV; the oxidation-reduction potential in the anoxic pond is controlled to be between-60 mV and-100 mV, and the oxidation-reduction potential in the first aerobic pond is controlled to be more than +250mV.
Compared with the prior art, the aquaculture wastewater treatment system and the treatment method thereof provided by the invention have the following beneficial effects:
1. multiple times of coagulating sedimentation treatment, CSTR anaerobic treatment and ion air floatation treatment are adopted, MBBR aerobic treatment, AO reaction treatment and artificial wetland treatment are matched, the effective treatment of the culture wastewater is realized, the treated water quality stably reaches the first level of integrated wastewater discharge standard 8978-1996, and the standard discharge or recycling requirements are completely met.
2. And oxidation-reduction potentiometers are respectively arranged in the CSTR anaerobic reactor, the MBBR aerobic tank, the anoxic tank and the first aerobic tank and used for monitoring the sewage nitrification and denitrification reaction condition in the system, and the oxidation-reduction potentiometers are used for accurately controlling each stage to ensure that pollutants in each stage are removed.
3. And a dissolved oxygen measuring instrument is additionally arranged in the anoxic tank and the first aerobic tank and used for accurately controlling the operation environment in the biochemical tank.
4. A PH meter, a COD online monitor, an ammonia nitrogen online monitor and a total phosphorus online monitor are arranged in the clear water channel, measurement data are fed back to a front-end system to be controlled, and the front-end system timely makes corresponding adjustment according to the change condition of the water quality of the outlet water.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a process flow diagram of a cultivation wastewater treatment system provided by the 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 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.
Referring to fig. 1, fig. 1 is a process flow diagram of a cultivation wastewater treatment system according to the present invention. The aquaculture wastewater treatment system 1 comprises a sewage collection device 11, a solid-liquid separation device 12, a first coagulation sedimentation device 13, a separation liquid collection tank 14, a CSTR anaerobic reactor 15, a biogas slurry sedimentation tank 16, an ion floatation device 17, an adjusting tank 18, an MBBR aerobic tank 19, a primary sedimentation tank 20, an AO reaction subsystem 21, a secondary sedimentation tank 22, a second coagulation sedimentation device 23, a clean water tank 24, an artificial wetland subsystem 25, a clear water channel 26 and a sludge tank, wherein the sewage collection device 11, the solid-liquid separation device 12, the first coagulation sedimentation device 13, the separation liquid collection tank 14, the CSTR anaerobic reactor 15, the biogas slurry sedimentation tank 16, the ion floatation device 17, the adjusting tank 18, the MBBR aerobic tank 19, the primary sedimentation tank 20, the AO reaction subsystem 21, the secondary sedimentation tank 22, the second coagulation sedimentation device 23, the clean water tank 24, the artificial wetland subsystem 25 and the clear water channel 26 are sequentially connected; the first coagulation sedimentation device 13, the biogas slurry sedimentation tank 16, the primary sedimentation tank 20, the secondary sedimentation tank 22, the second coagulation sedimentation device 23 and the clean water tank 24 are respectively connected with the sludge tank, and part of sludge in the primary sedimentation tank 20 flows back to the MBBR aerobic tank 19.
The sewage collecting device 11 comprises a grid well 111 and a collecting tank 112, sewage collected by a collecting pipe network in a farm enters the grid well 111 for deslagging and then enters the collecting tank 112, and the collecting tank 112 is connected with the solid-liquid separation device 12.
The solid-liquid separation device 12 comprises a vibration screen solid-liquid separator 121 and a rotary screen filter 122 which are sequentially connected, the vibration screen solid-liquid separator 121 is connected with the water collecting tank 112, and the rotary screen filter 122 is connected with the first coagulating sedimentation device 13.
The first coagulating sedimentation device 13 and the second coagulating sedimentation device 23 have the same structure, and comprise a drug adding mixing tank 131 and a drug adding sedimentation tank 132, and the bottom of the drug adding sedimentation tank 132 is provided with an inclined plate 1321; the sewage is fully stirred and mixed with the added coagulation-aiding substances (such as PAM, PAC and the like) in the dosing mixing tank 131, then automatically flows into the dosing sedimentation tank 132, the sedimentation hydraulic retention time is prolonged through the inclined plate 1321, and suspended matters with smaller particle sizes in the treated water are further intercepted.
The AO reaction subsystem 21 comprises an anoxic tank 211, a first aerobic tank 212, a second aerobic tank 213 and a third aerobic tank 214 which are connected in sequence, the anoxic tank 211 is connected with the primary sedimentation tank 20, the third aerobic tank 214 is connected with the secondary sedimentation tank 22, part of nitrified liquid in the third aerobic tank 214 flows back to the anoxic tank 211, and part of sludge in the secondary sedimentation tank 22 flows back to the anoxic tank 211.
The constructed wetland subsystem 25 comprises a constructed wetland 251 and a disinfection pond 252, wherein the constructed wetland 251 is connected with the clean water tank 24, and the disinfection pond 252 is connected with the clean water channel 26. After the artificial wetland subsystem 25 is mature, a biofilm is formed on the surface of the filler and plant roots due to the growth of a large number of microorganisms, a large number of suspended matters are blocked and intercepted by the filler and the plant roots when wastewater flows through the biofilm, organic pollutants are removed through the absorption, assimilation and dissimilation of the biofilm, and the aerobic, anoxic and anaerobic states sequentially appear in the surrounding environment due to the transfer and release of the plant roots to oxygen in the wetland system, so that nitrogen and phosphorus in the wastewater can be absorbed as nutrients through plants and microorganisms, and can be removed through nitrification and denitrification, and finally the pollutants are removed by replacing the filler or harvesting the planted plants in the wetland system.
The MBBR aerobic tank 19, the first aerobic tank 212, the second aerobic tank 213 and the third aerobic tank 214 are all provided with aeration pipes 215.
An alkalinity meter is arranged at the water inlet of the CSTR anaerobic reactor 15 to ensure that the alkalinity of the inlet water of the CSTR anaerobic reactor 15 is more than 100mg/l.
Oxidation-reduction potentiometers are installed in the CSTR anaerobic reactor 15, the MBBR aerobic tank 19, the anoxic tank 211 and the first aerobic tank 212 and used for monitoring the nitrification and denitrification reaction condition of sewage, and each stage is accurately controlled by the oxidation-reduction potentiometers to ensure that pollutants in each stage are removed.
Dissolved oxygen measuring instruments are further arranged in the anoxic tank 211 and the first aerobic tank 212 and are used for accurately controlling the operation environment in the biochemical tank; a PH meter, a COD online monitor, an ammonia nitrogen online monitor and a total phosphorus online monitor are installed in the clear water channel 26, measurement data are fed back to a front-end system to be controlled, and the front-end system timely makes corresponding adjustment according to the change condition of the water quality of the discharged water.
In addition, the aquaculture wastewater treatment system 1 further comprises a black film pond 28, and the black film pond 28 is respectively connected with the water collecting pond 112, the separation liquid collecting pond 14 and the anoxic pond 211.
The invention also provides a treatment method of the culture wastewater treatment system, which comprises the following steps:
step one, pretreatment: sewage collected by a collecting pipe network in the farm passes through the sewage collecting device 11 and the solid-liquid separation device 12 in sequence to remove suspended matters;
specifically, the sewage collected by the collecting pipe network in the farm first enters the grid well 111, and then enters the water collecting tank 112 after the larger strip-shaped and irregular particles in the sewage are removed by the rake tooth type mechanical grid; after being stirred and lifted, the sewage in the water collecting tank 112 enters the solid-liquid separator 121 of the vibrating screen to further remove small particulate matters (such as excrement residues), the separated sewage passes through the rotary screen filter 122, the filtering precision of the rotary screen is 0.1mm, the removal rate of suspended matters can reach 95%, and the removal rate is improved by more than 80% compared with that of a common solid-liquid separation process;
step two, carrying out primary coagulating sedimentation treatment: the pretreated sewage enters the first coagulation sedimentation device 13, is fully mixed with added coagulation-aiding substances (such as PAM, PAC and the like) in the first coagulation sedimentation device 13 and then is subjected to sedimentation separation, then the sewage after the first coagulation sedimentation treatment is discharged into the separation liquid collecting tank 14, and sediments enter the sludge tank;
step three, CSTR anaerobic treatment: pumping the sewage in the separation liquid collecting tank into the CSTR anaerobic reactor 15 for anaerobic treatment, then discharging the sewage after the CSTR anaerobic treatment into the biogas slurry sedimentation tank 16 for sedimentation, and enabling sediment to enter the sludge tank;
specifically, the water inlet alkalinity of the CSTR anaerobic reactor 15 is more than 100mg/l, the oxidation-reduction potential in the reactor is controlled to be between-300 mV and-400 mV, the pH is controlled to be between 6.8 and 7.2, and the feeding mode of the reactor adopts constant-temperature continuous feeding or semi-continuous feeding operation; in the CSTR anaerobic reactor 15, the newly-fed raw materials are quickly mixed with all fermentation liquid strains in the fermentor due to the stirring effect, so that the concentration of the fermentation substrate is always kept in a relatively low state;
step four, ion air flotation treatment: pumping the sewage in the biogas slurry sedimentation tank into the ion air floatation device 17 for air floatation treatment, and then discharging the sewage subjected to the ion air floatation treatment into the adjusting tank 18;
specifically, the ion air floatation device 17 is an air floatation device integrating flocculation, air floatation, skimming and mud scraping, the hydraulic retention time is 3~5 minutes, forced water distribution and static separation are adopted, the adhesion of micro bubbles and flocs occurs in the whole air floatation separation process including a contact area, scum is discharged instantly, the water disturbance is small, the effluent suspended matter is low, the slag solid content is high, and the suspended matter removal rate can reach more than 99.5%;
step five, MBBR aerobic treatment: firstly, adjusting the sewage in the adjusting tank 18, then pumping the sewage into the MBBR aerobic tank 19 for aerobic treatment, discharging the sewage subjected to the MBBR aerobic treatment into the primary sedimentation tank 20 for sedimentation, refluxing a part of sediment into the MBBR aerobic tank 19, and feeding the rest sediment into the sludge tank;
specifically, the sewage in the regulating tank 18 is regulated by supplementing a carbon source (flour or sodium acetate), adding a cross-flow Kong Baoqi and pushing flow, so that the normal and effective operation of a biochemical system can be realized while the alkalinity of the effluent is ensured; the oxidation-reduction potential in the MBBR aerobic pool 19 is more than +200mV;
step six: AO reaction treatment: the AO reaction subsystem 21 comprises an anoxic tank 211, a first aerobic tank 212, a second aerobic tank and a 213 third aerobic tank 214 which are connected in sequence, the sewage in the primary sedimentation tank 20 sequentially enters the anoxic tank 211, the first aerobic tank 212, the second aerobic tank 213 and the third aerobic tank 214 for treatment, part of nitrified liquid in the third aerobic tank 214 flows back to the anoxic tank 211, then the sewage after AO reaction treatment enters the secondary sedimentation tank 22 for sedimentation, part of sediment flows back to the anoxic tank 211, and the rest of sediment enters the sludge tank;
specifically, the oxidation-reduction potential in the anoxic pond 211 is controlled to be-60 mV to-100 mV, and the oxidation-reduction potential in the first aerobic pond 212 is controlled to be more than +250mV;
step seven, carrying out second coagulating sedimentation treatment: pumping the sewage in the secondary sedimentation tank into the second coagulating sedimentation device, fully mixing the sewage with added coagulation-aiding substances (such as PAM, PAC and the like) in the second coagulating sedimentation device, then carrying out sedimentation separation, discharging the sewage subjected to secondary coagulating sedimentation treatment into the clean water tank, and enabling sediments to enter the sludge tank; carrying out precipitation separation on the sewage in the clean water tank again, and enabling the precipitate to enter the sludge tank;
step eight, artificial wetland treatment: pumping the sewage in the clean water tank into the artificial wetland subsystem for treatment, and then discharging the sewage after the artificial wetland treatment into the clean water channel; the sewage in the clear water channel is monitored on line, and when the water quality is stable and reaches the first level of integrated sewage discharge standard 8978-1996, the sewage is discharged or recycled.
The cultivation wastewater treatment system 1 and the treatment method thereof provided by the invention have the following beneficial effects:
1. multiple times of coagulating sedimentation treatment, CSTR anaerobic treatment and ion air floatation treatment are adopted, MBBR aerobic treatment, AO reaction treatment and artificial wetland treatment are matched, the effective treatment of the culture wastewater is realized, the treated water quality stably reaches the first level of integrated wastewater discharge standard 8978-1996, and the standard discharge or recycling requirements are completely met.
2. Oxidation-reduction potentiometers are respectively installed in the CSTR anaerobic reactor 15, the MBBR aerobic tank 19, the anoxic tank 211 and the first aerobic tank 212 and used for monitoring the sewage nitrification and denitrification reaction condition in the system, and the oxidation-reduction potentiometers are used for accurately controlling each stage to ensure that pollutants in each stage are removed.
3. The dissolved oxygen measuring instrument is additionally arranged in the anoxic tank 211 and the first aerobic tank 212 and is used for accurately controlling the operating environment in the biochemical tank.
4. The PH meter, the COD on-line monitor, the ammonia nitrogen on-line monitor and the total phosphorus on-line monitor are arranged in the clear water channel 26, measurement data are fed back to a front-end system to be controlled, and the front-end system timely makes corresponding adjustment according to the change condition of the effluent quality.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A culture wastewater treatment system is characterized by comprising a sewage collection device, a solid-liquid separation device, a first coagulation sedimentation device, a separation liquid collection tank, a CSTR anaerobic reactor, a biogas slurry sedimentation tank, an ion floatation device, an adjusting tank, an MBBR aerobic tank, a primary sedimentation tank, an AO reaction subsystem, a secondary sedimentation tank, a second coagulation sedimentation device, a clean water tank, an artificial wetland subsystem, a clean water channel and a sludge tank, wherein the sewage collection device, the solid-liquid separation device, the first coagulation sedimentation device, the separation liquid collection tank, the CSTR anaerobic reactor, the biogas slurry sedimentation tank, the ion floatation device, the adjusting tank, the MBBR aerobic tank, the primary sedimentation tank, the AO reaction subsystem, the secondary sedimentation tank, the second coagulation sedimentation device, the clean water tank, the artificial wetland subsystem and the clean water channel are sequentially connected; the AO reaction subsystem comprises an anoxic tank, a first aerobic tank, a second aerobic tank and a third aerobic tank which are sequentially connected, the anoxic tank is connected with the primary sedimentation tank, the third aerobic tank is connected with the secondary sedimentation tank, and part of nitrified liquid in the third aerobic tank flows back to the anoxic tank; the first coagulation sedimentation device, the biogas slurry sedimentation tank, the primary sedimentation tank, the secondary sedimentation tank, the second coagulation sedimentation device and the clean water tank are respectively connected with the sludge tank, part of sludge in the primary sedimentation tank flows back to the MBBR aerobic tank, and part of sludge in the secondary sedimentation tank flows back to the anoxic tank; oxidation-reduction potentiometers are arranged in the CSTR anaerobic reactor, the MBBR aerobic tank, the anoxic tank and the first aerobic tank, and dissolved oxygen measuring instruments are also arranged in the anoxic tank and the first aerobic tank; and a PH meter, a COD (chemical oxygen demand) online monitor, an ammonia nitrogen online monitor and a total phosphorus online monitor are arranged in the clear water channel.
2. The aquaculture wastewater treatment system of claim 1, wherein the wastewater collection device comprises a grid well and a water collection tank, wastewater collected by a collection pipe network in the aquaculture farm enters the grid well for deslagging and then enters the water collection tank, and the water collection tank is connected with the solid-liquid separation device.
3. The aquaculture wastewater treatment system according to claim 1, wherein the solid-liquid separation device comprises a vibrating screen solid-liquid separator and a rotating screen filter which are connected in sequence, the vibrating screen solid-liquid separator is connected with the wastewater collection device, and the rotating screen filter is connected with the first coagulating sedimentation device.
4. The aquaculture wastewater treatment system according to claim 1, wherein the first coagulation sedimentation device and the second coagulation sedimentation device have the same structure and comprise a dosing mixing tank and a dosing sedimentation tank, and the bottom of the dosing sedimentation tank is provided with an inclined plate.
5. The aquaculture wastewater treatment system of claim 1 wherein the MBBR aerobic tank, the first aerobic tank, the second aerobic tank and the third aerobic tank are provided with aeration pipes.
6. The aquaculture wastewater treatment system of claim 1 wherein the water inlet of the CSTR anaerobic reactor is provided with an alkalinity meter.
7. The aquaculture wastewater treatment system of claim 1 further comprising a black membrane tank, said black membrane tank being connected to said wastewater collection device, said separated fluid collection tank, and said AO reaction subsystem, respectively.
8. A treatment method for a aquaculture wastewater treatment system according to any one of claims 1~7, comprising the steps of:
step one, pretreatment: sewage collected by a collecting pipe network in the farm passes through the sewage collecting device and the solid-liquid separation device in sequence to remove suspended matters;
step two, carrying out primary coagulating sedimentation treatment: the pretreated sewage enters the first coagulating sedimentation device, is fully mixed with the added coagulation aiding substances in the first coagulating sedimentation device and then is subjected to precipitation separation, then the sewage after the first coagulating sedimentation treatment is discharged into the separation liquid collecting tank, and the precipitate enters the sludge tank;
step three, CSTR anaerobic treatment: pumping the sewage in the separation liquid collecting tank into the CSTR anaerobic reactor for anaerobic treatment, then discharging the sewage after the CSTR anaerobic treatment into the biogas slurry sedimentation tank for sedimentation, and feeding the sediment into the sludge tank;
step four, ion air flotation treatment: pumping the sewage in the biogas slurry sedimentation tank into the ion air floatation device for air floatation treatment, and then discharging the sewage subjected to the ion air floatation treatment into the adjusting tank;
step five, MBBR aerobic treatment: firstly, regulating the sewage in the regulating tank, then pumping the sewage into the MBBR aerobic tank for aerobic treatment, discharging the sewage subjected to the MBBR aerobic treatment into the primary sedimentation tank for sedimentation, returning part of sediment to the MBBR aerobic tank, and feeding the rest sediment into the sludge tank;
step six: AO reaction treatment: the AO reaction subsystem comprises an anoxic tank, a first aerobic tank, a second aerobic tank and a third aerobic tank which are connected in sequence, sewage in the primary sedimentation tank sequentially enters the anoxic tank, the first aerobic tank, the second aerobic tank and the third aerobic tank for treatment, part of nitrified liquid in the third aerobic tank flows back to the anoxic tank, then the sewage after AO reaction treatment enters the secondary sedimentation tank for sedimentation, part of sediment flows back to the anoxic tank, and the rest sediment enters the sludge tank;
step seven, carrying out secondary coagulating sedimentation treatment: pumping the sewage in the secondary sedimentation tank into the second coagulating sedimentation device, fully mixing the sewage with the added coagulation aiding substances in the second coagulating sedimentation device, carrying out sedimentation separation, then discharging the sewage after the secondary coagulating sedimentation treatment into the clean water tank, and enabling the sediment to enter the sludge tank; carrying out precipitation separation on the sewage in the clean water tank again, and enabling the precipitate to enter the sludge tank;
step eight, artificial wetland treatment: pumping the sewage in the clean water tank into the artificial wetland subsystem for treatment, and then discharging the sewage after the artificial wetland treatment into the clean water channel; and carrying out online monitoring on the sewage in the clear water channel, and discharging or recycling the sewage after reaching the standard.
9. The aquaculture wastewater treatment system of claim 8, wherein the water inlet alkalinity of the CSTR anaerobic reactor is more than 100mg/l, the oxidation-reduction potential in the reactor is controlled to be-300 to-400 mV, the pH is controlled to be 6.8 to 7.2, and the feeding mode of the reactor adopts constant-temperature continuous feeding or semi-continuous feeding operation.
10. The aquaculture wastewater treatment system of claim 8 wherein the oxidation-reduction potential in the MBBR aerobic pond is greater than +200mV; the oxidation-reduction potential in the anoxic pond is controlled to be between-60 mV and-100 mV, and the oxidation-reduction potential in the first aerobic pond is controlled to be more than +250mV.
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