CN107010788B - Large-scale pig farm cultivation wastewater treatment system and method - Google Patents

Large-scale pig farm cultivation wastewater treatment system and method Download PDF

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CN107010788B
CN107010788B CN201710346003.4A CN201710346003A CN107010788B CN 107010788 B CN107010788 B CN 107010788B CN 201710346003 A CN201710346003 A CN 201710346003A CN 107010788 B CN107010788 B CN 107010788B
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CN107010788A (en
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黄恺
黄凌波
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Xiamen Shidifu Environmental Protection Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • 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
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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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  • Hydrology & Water Resources (AREA)
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  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses a large-scale pig farm cultivation wastewater treatment system and method, which mainly solve the problems of large occupied area, low treatment efficiency and low automatic control degree in the prior art. The large-scale pig farm cultivation wastewater treatment system comprises a pretreatment system, an anaerobic treatment system, an aerobic treatment system and a deep treatment system which are sequentially connected, wherein the deep treatment system comprises an MBR reaction tank, an electro-oxidation decolorizing device and a clean water tank which are sequentially connected. The method for treating the cultivation wastewater of the large-scale pig farm comprises the following steps: the pig farm wastewater enters a pretreatment system, an anaerobic treatment system and an aerobic treatment system, then enters a deep treatment system, the treated wastewater is discharged after reaching standards, and the manure, the biogas and the sludge generated in the treatment process are recycled.

Description

Large-scale pig farm cultivation wastewater treatment system and method
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a large-scale pig farm cultivation wastewater treatment system and method.
Background
With the rapid development of national economy in recent years, the livestock breeding industry in China is also gradually increased, large-scale intensive farms are built successively, and meanwhile, the relatively concentrated environmental pollution problem is brought. The air at the periphery and the air at the lower air port are polluted by malodorous gases such as methane, hydrogen sulfide, ammonia and the like in the air of the pig farm, and the waste water pollution of the pig farm is serious due to a large amount of liquid metabolites, pig house flushing waste water, partially scattered pig feeds and the like. Research shows that CODcr in the wastewater of large-scale pig farms is up to 4000-20000 mg/L, BOD is up to 1500-6000 mg/L, ammonia nitrogen concentration is 450-1500 mg/L, TP concentration is 50-330 mg/L, and the wastewater is high-nitrogen, high-phosphorus and high-concentration organic wastewater, and contains a large amount of undissolved suspended particles such as pig manure. At present, most of treatment technologies comprise physical filtration, anaerobic reaction tanks, aerobic reaction tanks and natural treatment systems, and the natural treatment systems mainly adopt artificial wetland, land treatment and stabilization pond technologies, and the treatment technologies have large occupied area, low treatment efficiency and low automatic control degree.
Disclosure of Invention
The invention aims to provide a system and a method for treating large-scale pig farm cultivation wastewater, which have the advantages of small occupied area, high treatment efficiency and high automation control degree.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a large-scale pig farm cultivation wastewater treatment system comprises a pretreatment system, an anaerobic treatment system, an aerobic treatment system and a deep treatment system which are connected in sequence;
the pretreatment system comprises a grid canal, a water collecting sedimentation tank, a solid-liquid separator and a uniform mixing hydrolysis tank which are connected in sequence, wherein a gate valve is arranged at the inlet of the water collecting sedimentation tank;
the anaerobic treatment system comprises an IC (integrated circuit) high-efficiency anaerobic reactor or an ACS (advanced sludge system) high-efficiency anaerobic reactor, a desulfurization aeration tank, an anaerobic sedimentation tank, a heat exchanger, a biogas collection and treatment system and a sludge treatment system, wherein a water inlet of the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor is connected with a water outlet of the uniform mixing hydrolysis tank, and a gate valve is arranged at the joint; the water inlet of the heat exchanger is connected with the water outlet of the uniform mixing hydrolysis tank, a gate valve is arranged at the joint, and the water outlet of the heat exchanger is connected with the water inlet of the IC efficient anaerobic reactor or the ACS efficient anaerobic reactor;
the aerobic treatment system comprises a primary A/O pool, a secondary sedimentation pool and a secondary A/O pool which are sequentially connected, wherein a water inlet of the primary A/O pool is connected with a water outlet of the anaerobic sedimentation pool;
the advanced treatment system comprises an MBR reaction tank, an electro-oxidation decolorizing device and a clean water tank which are sequentially connected, wherein a water inlet of the MBR reaction tank is connected with a water outlet of the secondary A/O.
The biogas collection and treatment system in the anaerobic treatment system comprises a first gas-water separator, a desulfurization device, a biogas storage cabinet, a second gas-water separator, a biogas booster and a steam boiler which are sequentially connected, the sludge treatment system comprises a sludge concentration tank, a reaction tank and a dehydrator which are sequentially connected, and the steam boiler conveys steam to a steam using point and the heat exchanger through conveying pipelines.
The pretreatment system further comprises an emergency discharge system, the emergency discharge system comprises a totally-enclosed anaerobic pond and a water collecting pond which are sequentially connected, an inlet of the totally-enclosed anaerobic pond is connected with an outlet of the grid canal, a gate valve is arranged at the joint, and a water outlet of the water collecting pond is connected with a water inlet of the water collecting sedimentation pond through a water pump.
The IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor is connected with the first gas-water separator through a pipeline, and the totally-enclosed anaerobic pond is connected with the first gas-water separator through a pipeline.
The device comprises an IC high-efficiency anaerobic reactor or an ACS high-efficiency anaerobic reactor, an anaerobic sedimentation tank, a secondary sedimentation tank and an MBR reaction tank, wherein a sludge discharge port of the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor is connected with an inlet of a sludge concentration tank through a sludge discharge pump, a sludge discharge port of the anaerobic sedimentation tank is connected with a sludge reflux port of the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor through a sludge reflux water pump, a sludge discharge port of the secondary sedimentation tank is connected with a sludge reflux port of a primary A/O tank through a sludge reflux water pump, and a sludge discharge port of the MBR reaction tank is connected with a sludge reflux port of a secondary A/O through a sludge reflux water pump, and a water outlet of the sludge concentration tank is connected with an inlet of a uniform hydrolysis tank.
An MBR filtering membrane component is arranged in the MBR reaction tank, an aeration device is arranged at the lower part of the MBR filtering membrane component, a blower is arranged at the bottom of the MBR reaction tank, and an air inlet of the aeration device is connected with an air outlet of the blower.
The large-scale pig farm cultivation wastewater treatment system is provided with an automatic control system PLC for controlling the operation of the water pump and the blower, and is provided with an on-line monitoring control system for controlling the operation of the biogas collection and treatment system, the water pump and the blower.
The electro-oxidation decolorizing device comprises an electrode plate which can remove organic pollutants in wastewater by utilizing electrode oxidation-reduction reaction and decolorize the wastewater, wherein the electrode plate is made of an alloy plate, a low-carbon plate, an aluminum plate or a combination thereof, the effect is stable, the service life is long, industrial scrap iron and coke filler are arranged in the electro-oxidation equipment, and the wastewater enters the electro-oxidation equipment and then undergoes micro-electrolysis reaction with low-valence iron in the filler, so that Fe is released from the low-valence iron filler 2+ At the same time under the catalysis of high-pressure dissolved oxygen of the equipment, fe 2+ Conversion to Fe 3+ New Fe 2+ And Fe (Fe) 3+ The flocculant is a good flocculant and has a higher adsorption flocculation activity function, most of flocculated ferrous hydroxide and ferric hydroxide floats above the liquid surface under the action of high-pressure dissolved oxygen and is automatically skimmed by a skimming machine, and part of flocculated ferrous hydroxide and ferric hydroxide enters a natural sedimentation area for static sedimentation and then is automatically discharged to a sludge pond of the equipment.
A large-scale pig farm cultivation wastewater treatment method comprises the following steps:
(1) Firstly, the pig farm wastewater enters a pretreatment system for pretreatment, after the wastewater passes through a grid canal to remove massive floaters, a valve gate of an outlet of the grid canal and an inlet of a water collecting sedimentation tank is opened, after the wastewater enters the water collecting sedimentation tank and removes part of solid suspended matters through gravity sedimentation, the solid suspended matters are injected into a solid-liquid separator by a lifting water pump for solid-liquid separation, the obtained solid slag is sent to a manure residue yard for composting and then is sent to an organic fertilizer plant, and the waste liquid is discharged into a uniform hydrolysis tank to regulate water quantity and uniform water quality and perform preliminary hydrolytic acidification;
(2) The pretreated wastewater enters an anaerobic treatment system, a gate valve is opened after the uniform mixing hydrolysis tank is connected with the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor, the wastewater which is not lower than 20 ℃ in the uniform mixing hydrolysis tank is injected into the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor by a lifting water pump, most organic pollutants are removed after high-efficiency anaerobic digestion, biogas and biogas slurry are produced at the same time, the biogas flows into a desulfurization aeration tank for oxidation desulfurization and enter an anaerobic sedimentation tank for mud-water separation, the biogas enters a biogas collection and treatment system for collection and purification and then is supplied to a steam boiler for subsequent use, part of sludge in the anaerobic sedimentation tank is pumped into the anaerobic reactor for recycling by a sludge reflux water pump, and aged sludge in the IC high-efficiency anaerobic reactor or the high-efficiency anaerobic reactor and the anaerobic sedimentation tank is discharged to a sludge concentration tank by a sludge discharge pump at regular intervals;
(3) The wastewater after anaerobic treatment enters an aerobic treatment system for treatment, and the biological actions of a first-stage A/O, a second-stage A/O and a second-stage A/O are sequentially carried out, so that most of organic matters and ammonia nitrogen which are not easy to degrade in the wastewater are removed, the wastewater enters an aerobic pond, a dephosphorizing agent is quantitatively added into the aerobic pond of the second-stage A/O to remove phosphorus-containing substances in the wastewater, part of sludge in the second-stage A/O Chi Huiyong flows back into the first-stage A/O, and aged sludge in the second-stage A/O is periodically discharged to a sludge concentration pond through a sludge discharge pump;
(4) The wastewater after denitrification and dephosphorization of the aerobic treatment system enters an advanced treatment system, firstly, the wastewater is injected into an MBR reaction tank through a lifting water pump, aeration is carried out to an aeration device by utilizing a blower, on one hand, sufficient oxygen is provided for a biological membrane, on the other hand, the biological membrane is promoted to continuously shake, an excessively thick sludge layer is shaken off, organic pollutants are further removed through the choked flow and the microbial degradation effect of the membrane, the wastewater after the treatment of the MBR reaction tank is injected into an electro-oxidation decolorizing device through the lifting water pump, the undegraded organic pollutants, suspended matters and chromaticity are finally removed through the oxidation-reduction effect of an electrode plate and are discharged to a clean water tank to reach the standard for discharge or recycling, wherein the sludge of the MBR reaction tank is returned to a second-level A/O Chi Huiyong through the lifting water pump, and the aged sludge of the MBR reaction tank is discharged to a sludge concentrating tank through a sludge pump at regular time;
(5) And (3) pumping the sludge discharged in the steps (2) - (4) into a reaction tank through a lifting water pump, adding cationic PAM into the reaction tank, and dehydrating by using a dehydrator after flocculation separation to obtain dry sludge, wherein the dry sludge is transported to the outside for recycling, and the supernatant of the sludge concentration tank flows back to the blending hydrolysis tank for subsequent treatment.
(6) And (3) when the temperature of the wastewater discharged from the blending hydrolysis tank in the step (2) is lower than 20 ℃, opening a gate valve at the joint of the blending hydrolysis tank and the heat exchanger, discharging the wastewater into the heat exchanger, heating and preserving the heat of the wastewater in the heat exchanger by utilizing steam generated by a steam boiler in a methane collecting and disposing system, and discharging the wastewater into an IC (integrated circuit) high-efficiency anaerobic reactor or an ACS (anaerobic reactor) high-efficiency anaerobic reactor for anaerobic digestion after the temperature reaches 20 ℃.
The pretreatment system further comprises an emergency treatment method, a valve gate at the joint of the grid canal outlet and the inlet of the totally-enclosed anaerobic pond is opened, wastewater is discharged in an emergency mode, enters the totally-enclosed anaerobic pond, flows into the water collecting tank after anaerobic fermentation, then enters the water collecting sedimentation tank for subsequent treatment under the action of the lifting water pump, and biogas generated by anaerobic fermentation is sent to the first gas-water separator for treatment.
Compared with the prior art, the invention has the following beneficial effects:
(1) The treated effluent water quality of the invention stably reaches the pollutant emission limit value in the pollutant emission standard of livestock and poultry farming (GB 18596-2001), and can be used for breeding three water bodies of hurdle, aquaculture or surface water discharge;
(2) The invention has no secondary pollution, the manure, the marsh gas and the sludge are all collected and recycled, and the generated marsh gas supplies heat to the heat exchanger through the steam boiler, so that the anaerobic digestion reaction is not limited by low-temperature environment, and the economic and ecological environmental benefits are outstanding;
(3) The wastewater treatment system disclosed by the invention has the advantages of small occupied area, high automation degree, high treatment efficiency and wide adaptability.
Drawings
FIG. 1 is a schematic diagram of an MBR reaction tank of the advanced treatment system of the present invention;
fig. 2 is a flow chart of a processing method.
Reference numerals: MBR filtration membrane component, aeration device, blower and air blower
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples: as shown in fig. 2, a large-scale pig farm cultivation wastewater treatment system comprises a pretreatment system, an anaerobic treatment system, an aerobic treatment system and a deep treatment system which are connected in sequence;
as shown in fig. 2, the pretreatment system comprises a grid canal, a water collecting sedimentation tank, a solid-liquid separator and a uniform mixing hydrolysis tank which are connected in sequence, wherein a gate valve is arranged at the inlet of the water collecting sedimentation tank;
as shown in fig. 2, the anaerobic treatment system comprises an IC efficient anaerobic reactor or an ACS efficient anaerobic reactor, a desulfurization aeration tank, an anaerobic sedimentation tank, a heat exchanger, a biogas collection and disposal system and a sludge disposal system, wherein the water inlet of the IC efficient anaerobic reactor or the ACS efficient anaerobic reactor is connected with the water outlet of the blending hydrolysis tank, and the connection part is provided with a gate valve; the water inlet of the heat exchanger is connected with the water outlet of the uniform mixing hydrolysis tank, a gate valve is arranged at the joint, and the water outlet of the heat exchanger is connected with the water inlet of the IC efficient anaerobic reactor or the ACS efficient anaerobic reactor;
as shown in fig. 2, the aerobic treatment system comprises a primary A/O pool, a secondary sedimentation pool and a secondary A/O pool which are sequentially connected, wherein a water inlet of the primary A/O pool is connected with a water outlet of the anaerobic sedimentation pool;
as shown in FIG. 2, the advanced treatment system comprises an MBR reaction tank, an electro-oxidation decolorizing device and a clean water tank which are sequentially connected, wherein a water inlet of the MBR reaction tank is connected with a water outlet of the secondary A/O.
As shown in fig. 2, the biogas collection and treatment system in the anaerobic treatment system comprises a first gas-water separator, a desulfurization device, a biogas storage cabinet, a second gas-water separator, a biogas booster and a steam boiler which are sequentially connected, the sludge treatment system comprises a sludge concentration tank, a reaction tank and a dehydrator which are sequentially connected, and the steam boiler is used for conveying steam to a steam using point and the heat exchanger through a conveying pipeline.
As shown in fig. 2, the pretreatment system further comprises an emergency discharge system, the emergency discharge system comprises a totally-enclosed anaerobic pond and a water collecting pond which are sequentially connected, an inlet of the totally-enclosed anaerobic pond is connected with an outlet of the grid canal, a gate valve is arranged at the joint, and a water outlet of the water collecting pond is connected with a water inlet of the water collecting sedimentation pond through a water pump.
As shown in fig. 2, the IC or ACS high-efficiency anaerobic reactor is connected to the first gas-water separator through a pipe, and the totally-enclosed anaerobic pond is connected to the first gas-water separator through a pipe.
As shown in FIG. 2, the sludge discharge port of the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor, the anaerobic sedimentation tank, the secondary sedimentation tank and the MBR reaction tank are connected with the inlet of the sludge concentration tank through a sludge discharge pump, the sludge discharge port of the anaerobic sedimentation tank is connected with the sludge reflux port of the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor through a sludge reflux water pump, the sludge discharge port of the secondary sedimentation tank is connected with the sludge reflux port of the primary A/O tank through a sludge reflux water pump, the sludge discharge port of the MBR reaction tank is connected with the sludge reflux port of the secondary A/O tank through a sludge reflux water pump, and the water outlet of the sludge concentration tank is connected with the inlet of the uniform hydrolysis tank.
As shown in fig. 1 and 2, an MBR filtering membrane module 11 is disposed in the MBR reaction tank, an aeration device 12 is mounted at the lower part of the MBR filtering membrane module, a blower 13 is disposed at the bottom of the MBR reaction tank, and an air inlet of the aeration device 12 is connected with an air outlet of the blower 13.
In the embodiment, an automatic control system PLC is arranged to control the operation of the water pump and the blower, and on-line monitoring is arranged to control the operation of the biogas collection and treatment system, the water pump and the blower.
In this example, the anaerobic reactor was chosen to be an ACS high efficiency reactor.
In this example, the MBR membrane module in the MBR reaction tank was selected to be a microporous filter membrane of 0.04. Mu.m.
A large-scale pig farm cultivation wastewater treatment method comprises the following steps:
(1) Firstly, the pig farm wastewater enters a pretreatment system for pretreatment, after the wastewater passes through a grid canal to remove massive floaters, a valve gate of an outlet of the grid canal and an inlet of a water collecting sedimentation tank is opened, after the wastewater enters the water collecting sedimentation tank and removes part of solid suspended matters through gravity sedimentation, the solid suspended matters are injected into a solid-liquid separator by a lifting water pump for solid-liquid separation, the obtained solid slag is sent to a manure residue yard for composting and then is sent to an organic fertilizer plant, and the waste liquid is discharged into a uniform hydrolysis tank to regulate water quantity and uniform water quality and perform preliminary hydrolytic acidification;
(2) The pretreated wastewater enters an anaerobic treatment system, a gate valve is opened after the uniform mixing hydrolysis tank is connected with the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor, the wastewater which is not lower than 20 ℃ in the uniform mixing hydrolysis tank is injected into the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor by a lifting water pump, most organic pollutants are removed after high-efficiency anaerobic digestion, biogas and biogas slurry are produced at the same time, the biogas flows into a desulfurization aeration tank for oxidation desulfurization and enter an anaerobic sedimentation tank for mud-water separation, the biogas enters a biogas collection and treatment system for collection and purification and then is supplied to a steam boiler for subsequent use, part of sludge in the anaerobic sedimentation tank is pumped into the anaerobic reactor for recycling by a sludge reflux water pump, and aged sludge in the IC high-efficiency anaerobic reactor or the high-efficiency anaerobic reactor and the anaerobic sedimentation tank is discharged to a sludge concentration tank by a sludge discharge pump at regular intervals;
(3) The wastewater after anaerobic treatment enters an aerobic treatment system for treatment, and the biological actions of a first-stage A/O, a second-stage A/O and a second-stage A/O are sequentially carried out, so that most of organic matters and ammonia nitrogen which are not easy to degrade in the wastewater are removed, the wastewater enters an aerobic pond, a dephosphorizing agent is quantitatively added into the aerobic pond of the second-stage A/O to remove phosphorus-containing substances in the wastewater, part of sludge in the second-stage A/O Chi Huiyong flows back into the first-stage A/O, and aged sludge in the second-stage A/O is periodically discharged to a sludge concentration pond through a sludge discharge pump;
(4) The wastewater after denitrification and dephosphorization of the aerobic treatment system enters an advanced treatment system, firstly, the wastewater is injected into an MBR reaction tank through a lifting water pump, aeration is carried out to an aeration device by utilizing a blower, on one hand, sufficient oxygen is provided for a biological membrane, on the other hand, the biological membrane is promoted to continuously shake, an excessively thick sludge layer is shaken off, organic pollutants are further removed through the choked flow and the microbial degradation effect of the membrane, the wastewater after the treatment of the MBR reaction tank is injected into an electro-oxidation decolorizing device through the lifting water pump, the undegraded organic pollutants, suspended matters and chromaticity are finally removed through the oxidation-reduction effect of an electrode plate and are discharged to a clean water tank to reach the standard for discharge or recycling, wherein the sludge of the MBR reaction tank is returned to a second-level A/O Chi Huiyong through the lifting water pump, and the aged sludge of the MBR reaction tank is discharged to a sludge concentrating tank through a sludge pump at regular time;
(5) And (3) pumping the sludge discharged in the steps (2) - (4) into a reaction tank through a lifting water pump, adding cationic PAM into the reaction tank, and dehydrating by using a dehydrator after flocculation separation to obtain dry sludge, wherein the dry sludge is transported to the outside for recycling, and the supernatant of the sludge concentration tank flows back to the blending hydrolysis tank for subsequent treatment.
(6) And (3) when the temperature of the wastewater discharged from the blending hydrolysis tank in the step (2) is lower than 20 ℃, opening a gate valve at the joint of the blending hydrolysis tank and the heat exchanger, discharging the wastewater into the heat exchanger, heating and preserving the heat of the wastewater in the heat exchanger by utilizing steam generated by a steam boiler in a methane collecting and disposing system, and discharging the wastewater into an IC (integrated circuit) high-efficiency anaerobic reactor or an ACS (anaerobic reactor) high-efficiency anaerobic reactor for anaerobic digestion after the temperature reaches 20 ℃.
The pretreatment system further comprises an emergency treatment method, a valve gate at the joint of the grid canal outlet and the inlet of the totally-enclosed anaerobic pond is opened, wastewater is discharged in an emergency mode, enters the totally-enclosed anaerobic pond, flows into the water collecting tank after anaerobic fermentation, then enters the water collecting sedimentation tank for subsequent treatment under the action of the lifting water pump, and biogas generated by anaerobic fermentation is sent to the first gas-water separator for treatment.
In this embodiment, no pretreatment is performed by an emergency treatment method.
In this example, the temperature of the wastewater entering the ACS high-efficiency anaerobic reactor is controlled at 20-35 ℃. In this embodiment: the sewage treatment effect of each stage is as follows, and the final discharge meets the national standard.
Figure BDA0001296458200000091
The above-mentioned embodiments are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (7)

1. A large-scale pig farm cultivation wastewater treatment system is characterized by comprising a pretreatment system, an anaerobic treatment system, an aerobic treatment system and a deep treatment system which are connected in sequence;
the pretreatment system comprises a grid canal, a water collecting sedimentation tank, a solid-liquid separator and a uniform mixing hydrolysis tank which are connected in sequence, wherein a gate valve is arranged at the inlet of the water collecting sedimentation tank;
the anaerobic treatment system comprises an IC (integrated circuit) high-efficiency anaerobic reactor or an ACS (advanced sludge system) high-efficiency anaerobic reactor, a desulfurization aeration tank, an anaerobic sedimentation tank, a heat exchanger, a biogas collection and treatment system and a sludge treatment system, wherein a water inlet of the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor is connected with a water outlet of the uniform mixing hydrolysis tank, and a gate valve is arranged at the joint; the water inlet of the heat exchanger is connected with the water outlet of the uniform mixing hydrolysis tank, a gate valve is arranged at the joint, and the water outlet of the heat exchanger is connected with the water inlet of the IC efficient anaerobic reactor or the ACS efficient anaerobic reactor;
the aerobic treatment system comprises a primary A/O pool, a secondary sedimentation pool and a secondary A/O pool which are sequentially connected, wherein a water inlet of the primary A/O pool is connected with a water outlet of the anaerobic sedimentation pool;
the advanced treatment system comprises an MBR reaction tank, an electro-oxidation decolorizing device and a clean water tank which are sequentially connected, wherein a water inlet of the MBR reaction tank is connected with a water outlet of the secondary A/O;
the biogas collection and treatment system in the anaerobic treatment system comprises a first gas-water separator, a desulfurization device, a biogas storage cabinet, a second gas-water separator, a biogas booster and a steam boiler which are sequentially connected, the sludge treatment system comprises a sludge concentration tank, a reaction tank and a dehydrator which are sequentially connected, and the steam boiler is used for conveying steam to a steam use point and the heat exchanger through a conveying pipeline;
the sludge discharge ports of the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor, the anaerobic sedimentation tank, the secondary sedimentation tank and the MBR reaction tank are connected with the inlet of the sludge concentration tank through a sludge discharge pump,
the pretreatment system further comprises an emergency discharge system, the emergency discharge system comprises a totally-enclosed anaerobic pond and a water collecting pond which are sequentially connected, an inlet of the totally-enclosed anaerobic pond is connected with an outlet of the grid canal, a gate valve is arranged at the joint, and a water outlet of the water collecting pond is connected with a water inlet of the water collecting sedimentation pond through a water pump;
the electro-oxidation decoloring device comprises an electrode plate for removing organic pollutants in the wastewater and decoloring the wastewater by utilizing electrode oxidation-reduction reaction.
2. The large scale pig farm wastewater treatment system of claim 1, wherein: the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor is connected with the first gas-water separator through a pipeline, and the totally-enclosed anaerobic pond is connected with the first gas-water separator through a pipeline.
3. The large scale pig farm wastewater treatment system of claim 2, wherein: the sludge discharge port of the anaerobic sedimentation tank is connected with the sludge reflux port of the IC efficient anaerobic reactor or the ACS efficient anaerobic reactor through a sludge reflux water pump, the sludge discharge port of the secondary sedimentation tank is connected with the sludge reflux port of the primary A/O tank through a sludge reflux water pump, the sludge discharge port of the MBR reaction tank is connected with the sludge reflux port of the secondary A/O tank through a sludge reflux water pump, and the water outlet of the sludge concentration tank is connected with the inlet of the blending hydrolysis tank.
4. The large scale pig farm wastewater treatment system of claim 1, wherein: an MBR filtering membrane component is arranged in the MBR reaction tank, an aeration device is arranged at the lower part of the MBR filtering membrane component, a blower is arranged at the bottom of the MBR reaction tank, and an air inlet of the aeration device is connected with an air outlet of the blower.
5. The large scale pig farm cultivation wastewater treatment system according to claim 4, wherein: the operation of the water pump and the blower is controlled by the PLC of the automatic control system, and the operation of the biogas collection and treatment system, the water pump and the blower is controlled by the PLC of the automatic control system.
6. A method for treating large-scale pig farm cultivation wastewater, which is characterized by adopting the large-scale pig farm cultivation wastewater treatment system as claimed in any one of claims 1-5 for treatment, comprising the following steps:
(1) Firstly, the pig farm wastewater enters a pretreatment system for pretreatment, after the wastewater passes through a grid canal to remove massive floaters, a valve gate of an outlet of the grid canal and an inlet of a water collecting sedimentation tank is opened, after the wastewater enters the water collecting sedimentation tank and removes part of solid suspended matters through gravity sedimentation, the solid suspended matters are injected into a solid-liquid separator by a lifting water pump for solid-liquid separation, the obtained solid slag is sent to a manure residue yard for composting and then is sent to an organic fertilizer plant, and the waste liquid is discharged into a uniform hydrolysis tank to regulate water quantity and uniform water quality and perform preliminary hydrolytic acidification;
(2) The pretreated wastewater enters an anaerobic treatment system, a gate valve is opened after the uniform mixing hydrolysis tank is connected with the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor, the wastewater which is not lower than 20 ℃ in the uniform mixing hydrolysis tank is injected into the IC high-efficiency anaerobic reactor or the ACS high-efficiency anaerobic reactor by a lifting water pump, most organic pollutants are removed after high-efficiency anaerobic digestion, biogas and biogas slurry are produced at the same time, the biogas flows into a desulfurization aeration tank for oxidation desulfurization and enter an anaerobic sedimentation tank for mud-water separation, the biogas enters a biogas collection and treatment system for collection and purification and then is supplied to a steam boiler for subsequent use, part of sludge in the anaerobic sedimentation tank is pumped into the anaerobic reactor for recycling by a sludge reflux water pump, and aged sludge in the IC high-efficiency anaerobic reactor or the high-efficiency anaerobic reactor and the anaerobic sedimentation tank is discharged to a sludge concentration tank by a sludge discharge pump at regular intervals;
(3) The wastewater after anaerobic treatment enters an aerobic treatment system for treatment, and the biological actions of a first-stage A/O, a second-stage A/O and a second-stage A/O are sequentially carried out, so that most of organic matters and ammonia nitrogen which are not easy to degrade in the wastewater are removed, the wastewater enters an aerobic pond, a dephosphorizing agent is quantitatively added into the aerobic pond of the second-stage A/O to remove phosphorus-containing substances in the wastewater, part of sludge in the second-stage A/O Chi Huiyong flows back into the first-stage A/O, and aged sludge in the second-stage A/O is periodically discharged to a sludge concentration pond through a sludge discharge pump;
(4) The wastewater after denitrification and dephosphorization of the aerobic treatment system enters an advanced treatment system, firstly, the wastewater is injected into an MBR reaction tank through a lifting water pump, aeration is carried out to an aeration device by utilizing a blower, on one hand, sufficient oxygen is provided for a biological membrane, on the other hand, the biological membrane is promoted to continuously shake off, an excessively thick sludge layer is shaken off, organic pollutants are removed through the choked flow and the microbial degradation effect of the membrane, the wastewater after the treatment of the MBR reaction tank is injected into an electro-oxidation decolorizing device through the lifting water pump, the undegraded organic pollutants, suspended matters and chromaticity are finally removed through the oxidation-reduction effect of an electrode plate and are discharged to a clean water tank to reach the standard for discharge or recycling, wherein the sludge of the MBR reaction tank is returned to a secondary A/O Chi Huiyong through the lifting water pump, and the aged sludge of the MBR reaction tank is discharged to a sludge concentrating tank through a sludge pump at regular time;
(5) Pumping the sludge discharged in the steps (2) - (4) into a reaction tank through a lifting water pump, adding cationic PAM into the reaction tank, and dehydrating by using a dehydrator after flocculation separation to obtain dry sludge, wherein the dry sludge is transported to the outside for recycling, and the supernatant of the sludge concentration tank is returned to the blending hydrolysis tank for subsequent treatment;
(6) And (3) when the temperature of the wastewater discharged from the blending hydrolysis tank in the step (2) is lower than 20 ℃, opening a gate valve at the joint of the blending hydrolysis tank and the heat exchanger, discharging the wastewater into the heat exchanger, heating and preserving the heat of the wastewater in the heat exchanger by utilizing steam generated by a steam boiler in a methane collecting and disposing system, and discharging the wastewater into an IC (integrated circuit) high-efficiency anaerobic reactor or an ACS (anaerobic reactor) high-efficiency anaerobic reactor for anaerobic digestion after the temperature reaches 20 ℃.
7. The method for treating large-scale pig farm cultivation wastewater according to claim 6, wherein: the pretreatment system further comprises an emergency treatment method, a valve gate at the joint of the grid canal outlet and the inlet of the totally-enclosed anaerobic pond is opened, wastewater is discharged in an emergency mode, enters the totally-enclosed anaerobic pond, flows into the water collecting tank after anaerobic fermentation, then enters the water collecting sedimentation tank for subsequent treatment under the action of the lifting water pump, and biogas generated by anaerobic fermentation is sent to the first gas-water separator for treatment.
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