CN113045133A - System and method for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled with microalgae organisms - Google Patents
System and method for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled with microalgae organisms Download PDFInfo
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Abstract
The invention discloses a system and a method for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled with microalgae organisms; a system for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled microalgae organisms comprises a primary sedimentation tank, a regulating tank, an upflow anaerobic sludge bed reactor, a secondary sedimentation tank, a raceway pond microalgae reactor, a biofilm microalgae reactor, microalgae harvesting and wastewater post-treatment; the method is characterized in that: the culture wastewater enters a primary sedimentation tank through a switch valve, and the primary sedimentation tank is used for settling solid particles in the wastewater so that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank enters an upflow anaerobic sludge blanket reactor through a valve twelve; the upflow anaerobic sludge blanket reactor is used for anaerobically fermenting the livestock wastewater, reducing the COD of the wastewater and generating biological methane, the biological methane is discharged through an exhaust port, and the wastewater treated by the upflow anaerobic sludge blanket reactor enters a secondary sedimentation tank; the invention can be widely applied to the fields of livestock and poultry breeding industry and the like.
Description
Technical Field
The invention relates to the field of wastewater treatment systems and methods, in particular to a system and method for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled with microalgae organisms.
Background
China is a big livestock and poultry breeding country, with continuous large-scale and intensive development of breeding, a large amount of breeding wastewater is discharged every year, the color is dark, the smell is strong, the contents of suspended matters, organic matters, ammonia nitrogen and the like are very high, and the method becomes one of the most serious problems in agricultural pollution in China. According to statistics, about 100-150 m is generated in ten thousand piggeries with the number of piggeries stored in a fence every day3If the wastewater can not be properly treated, the wastewater poses serious threats to the natural environment, the persistence of pig farms and the human health. In recent years, with the continuous development of science and technology and the increasing attention on environmental problems, the adoption of a reasonable and effective method for treating livestock wastewater becomes a technological research and development hotspot.
The method is limited by natural condition factors such as land, environment and the like, is not sufficient in treatment, and can destroy the ecological balance of a water body, cause soil hardening and influence the growth of crops after long-term use. The anaerobic process, the aerobic process and the mixing process are main industrial mode livestock wastewater treatment processes. The anaerobic treatment process comprises an anaerobic biological filter, an anaerobic baffle plate reactor, a mixed anaerobic reactor, an upflow anaerobic sludge blanket reactor, a composite anaerobic reactor and the like. At present, the anaerobic digestion treatment process is simple, is widely applied to the treatment of aquaculture wastewater, can remove about 80 percent of organic matters dissolved in the wastewater, kill infectious germs in the wastewater, and can recycle methane. However, a large amount of biogas slurry wastewater generated by anaerobic fermentation is complex in components, is comprehensive organic wastewater containing high ammonia nitrogen, phosphate, COD and SS, has imbalance of carbon-nitrogen ratio, high nitrogen and phosphorus content and poor biodegradability, cannot meet the standard requirement of wastewater discharge, and needs to be additionally stored and treated.
Microalgae is a photoautotrophic microorganism with extremely high growth speed, absorbs carbon dioxide through photosynthesis, fixes elements such as carbon, nitrogen, phosphorus, potassium, sodium and the like in a water body, and synthesizes organic matters required for growth and metabolism. The environment adaptability is strong, the photosynthetic efficiency is high, ammonia nitrogen, phosphorus, organic matters and the like in the wastewater can be utilized in the growth process, the efficient treatment of the wastewater and the cyclic utilization of nutrient substances are expected to be realized, and simultaneously, a large amount of microalgae biomass energy is obtained and can be used as organic fertilizer, energy chemical raw materials and the like. The microalgae culture method for treating wastewater is low in cost, green and environment-friendly and has wide applicability. However, the wastewater discharged from livestock and poultry farms has high turbidity, high ammonium salt concentration and large heavy metal ion amount, and can cause strong toxic action on microalgae when the microalgae is directly cultured, so that the growth of the microalgae is slow, and the removal rate of nitrogen, phosphorus and organic matters in the wastewater is reduced.
Generally speaking, the traditional multi-stage sewage treatment process is required for treating the wastewater of the livestock and poultry farm at present, the process is complex, the cost is high, and the development of the livestock and poultry breeding industry and the implementation of environmental protection are influenced. In order to solve the existing problems, the design and development of a more effective livestock and poultry wastewater comprehensive treatment process suitable for practical application are urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a system and a method for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled with microalgae organisms.
The technical scheme of the invention is that the system for treating livestock and poultry breeding wastewater by anaerobic fermentation coupling microalgae organisms comprises a primary sedimentation tank, a regulating tank, an upflow anaerobic sludge bed reactor, a secondary sedimentation tank, a raceway pond microalgae reactor, a biomembrane microalgae reactor, microalgae harvesting and wastewater post-treatment; the method is characterized in that:
the culture wastewater enters a primary sedimentation tank through a switch valve, and the primary sedimentation tank is used for settling solid particles in the wastewater so that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank enters an upflow anaerobic sludge blanket reactor through a valve twelve;
the upflow anaerobic sludge blanket reactor is used for anaerobic fermentation of livestock wastewater, reduces COD of the wastewater, generates biological methane and reasonably utilizes the chemical energy of pollutants in the wastewater; discharging the biological methane through an exhaust port, and feeding the wastewater treated by the upflow anaerobic sludge bed reactor into a secondary sedimentation tank;
the secondary sedimentation tank is used for storing wastewater and reducing the content of suspended solid in the wastewater; the wastewater treated by the secondary sedimentation tank enters a raceway tank microalgae reactor through a thirteen valve for microalgae culture or enters a biomembrane microalgae reactor through a fourteen valve for microalgae culture;
the raceway pond microalgae reactor is used for culturing microalgae by utilizing a fermentation biogas slurry suspension method, and reducing the content of ammonia nitrogen, phosphorus and COD in wastewater to obtain high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the raceway pond microalgae reactor and the treated wastewater into microalgae for harvesting;
the biomembrane microalgae reactor is used for culturing microalgae by utilizing a fermentation biogas slurry biomembrane method, reducing the content of ammonia nitrogen, phosphorus and COD in wastewater and obtaining high-concentration algae slurry; discharging the high-concentration algae slurry obtained by the biomembrane microalgae reactor and the treated wastewater into microalgae for harvesting;
the microalgae harvesting is used for separating microalgae biomass from the treated wastewater to obtain microalgae biomass byproducts; discharging the wastewater obtained by harvesting and separating the microalgae into wastewater for post-treatment;
the post-treatment of the wastewater is used for adjusting the chromaticity of the wastewater and sterilizing the wastewater so as to ensure that the wastewater reaches the discharge standard.
According to the preferable scheme of the system for treating the livestock and poultry breeding wastewater by anaerobic fermentation coupled microalgae organisms, the breeding wastewater enters the regulating tank through the switch valve nine; the regulating tank is used for storing and regulating the water inflow of wastewater treatment, reducing the dissolved oxygen of the wastewater or reducing the toxicity of the wastewater to anaerobic fermentation bacteria; and the wastewater treated by the regulating tank enters a primary sedimentation tank.
The second technical scheme of the invention is that the method of the system for treating the livestock and poultry breeding wastewater by anaerobic fermentation and microalgae biological coupling is characterized in that: the method comprises the following steps:
step one, feeding the culture wastewater into a primary sedimentation tank through a switch valve, wherein the primary sedimentation tank is used for settling solid particles in the wastewater so as to ensure that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank enters an upflow anaerobic sludge blanket reactor through a valve twelve;
secondly, the upflow anaerobic sludge blanket reactor carries out anaerobic fermentation on the influent livestock wastewater, reduces the COD of the wastewater, generates biological methane and reasonably utilizes the chemical energy of pollutants in the wastewater; discharging the biological biogas through an exhaust port, and discharging the wastewater treated by the upflow anaerobic sludge bed reactor into a secondary sedimentation tank;
step three, the secondary sedimentation tank stores the wastewater, so that the content of suspended solid in the wastewater is reduced; when the COD concentration of the wastewater treated by the secondary sedimentation tank is lower than a set value, discharging the treated wastewater into a raceway pond microalgae reactor through a valve thirteen for microalgae culture, and entering a step four; when the COD concentration of the wastewater treated by the secondary sedimentation tank is higher than a set value, discharging the treated wastewater into a biofilm microalgae reactor through a valve fourteen for microalgae culture; entering the step five;
step four, culturing microalgae by the raceway pond microalgae reactor by using a fermentation biogas slurry suspension method, and reducing the content of ammonia nitrogen, phosphorus and COD in the wastewater to obtain high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the raceway pond microalgae reactor and the treated wastewater into microalgae for harvesting, and entering a sixth step;
step five, the biomembrane microalgae reactor is used for culturing microalgae by utilizing a fermentation biogas slurry biomembrane method, reducing the content of ammonia nitrogen, phosphorus and COD in wastewater and obtaining high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the biomembrane microalgae reactor and the treated wastewater into microalgae for harvesting;
step six, collecting and separating microalgae biomass and treated wastewater by the microalgae to obtain microalgae biomass byproducts; discharging the wastewater obtained by harvesting and separating the microalgae into wastewater for post-treatment;
and seventhly, adjusting the chromaticity of the wastewater through the wastewater post-treatment, and sterilizing to enable the wastewater to reach the discharge standard.
According to the preferable scheme of the method for treating the livestock and poultry breeding wastewater by anaerobic fermentation coupled microalgae organisms, when the livestock and poultry breeding wastewater has strong toxicity to anaerobic fermentation bacteria, the breeding wastewater enters the regulating tank through the switch valve nine; the adjusting tank stores and adjusts the water inflow of wastewater treatment, reduces the dissolved oxygen of the wastewater and reduces the toxicity of the wastewater to anaerobic fermentation bacteria; and discharging the wastewater treated by the regulating tank into a primary settling tank.
The system and the method for treating the livestock and poultry breeding wastewater by anaerobic fermentation coupled microalgae organisms have the beneficial effects that: according to the invention, the working condition is flexibly adjusted according to the floating condition of the wastewater quality of the livestock and poultry farm, the wastewater is deeply purified, the structure is reasonable, the design is comprehensive, the environmental benefit is good, and the microalgae material obtained by fermenting in the wastewater treatment process can be used for power generation and production and can be made into the algae organic fertilizer, so that certain economic benefit is brought; the invention can be widely applied to the fields of livestock and poultry breeding industry and the like.
Drawings
FIG. 1 is a schematic structural diagram of a system for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled with microalgae organisms.
FIG. 2 is a process scheme of the flow chart of example 1.
FIG. 3 is a scheme showing the second process in example 1.
FIG. 4 is a three-process scheme for the flow chart of example 1.
FIG. 5 is a four-pass process scheme for example 1.
FIG. 6 is a schematic diagram of a process scheme five in the flow chart of example 1.
Detailed Description
The culture wastewater enters a primary sedimentation tank 1 through a switch valve ten 10, and the primary sedimentation tank 1 is used for settling solid particles in the wastewater so that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank 1 enters an upflow anaerobic sludge blanket reactor 3 through a valve twelve 12;
the upflow anaerobic sludge blanket reactor 3 is used for anaerobic fermentation of livestock wastewater, reduces COD of the wastewater, generates biological methane and reasonably utilizes the chemical energy of pollutants in the wastewater; the biological methane is discharged through an exhaust port, and the wastewater treated by the upflow anaerobic sludge blanket reactor 3 enters a secondary sedimentation tank 4;
the secondary sedimentation tank 4 is used for storing wastewater, reducing the content of solid suspended matters in the wastewater and adjusting the water inflow of subsequent microalgae culture; the wastewater treated by the secondary sedimentation tank 4 enters a raceway pond microalgae reactor 5 through a valve thirteen 13 for microalgae culture or enters a biological membrane microalgae reactor 6 through a valve fourteen 14 for microalgae culture;
the raceway pond microalgae reactor 5 is used for culturing microalgae by utilizing a fermentation biogas slurry suspension method, reducing the content of ammonia nitrogen, phosphorus and COD in wastewater and obtaining high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the raceway pond microalgae reactor 5 and the treated wastewater into microalgae harvesting 7;
the biomembrane microalgae reactor 6 is used for culturing microalgae by utilizing a fermentation biogas slurry biomembrane method, reducing the content of ammonia nitrogen, phosphorus and Chemical Oxygen Demand (COD) in wastewater and obtaining high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the biomembrane microalgae reactor 6 and the treated wastewater into microalgae harvesting 7;
the microalgae harvesting 7 is used for separating microalgae biomass from the treated wastewater to obtain microalgae biomass byproducts; and (3) discharging the wastewater separated by the microalgae harvesting 7 into wastewater post-treatment 8.
And the wastewater post-treatment 8 is used for adjusting the chromaticity of the wastewater and sterilizing the wastewater so as to enable the wastewater to reach the discharge standard.
Wherein the upflow anaerobic sludge blanket reactor 3 and the secondary sedimentation tank 4 form an anaerobic fermentation treatment system, and the raceway pond microalgae reactor 5, the biomembrane microalgae reactor 6 and the microalgae harvesting 7 form a microalgae culture treatment system.
In the specific embodiment, the aquaculture wastewater enters the adjusting tank 2 through the switch valve nine 9; the adjusting tank 2 is used for storing and adjusting the water inflow of wastewater treatment, reducing the dissolved oxygen of the wastewater or reducing the toxicity of the wastewater to anaerobic fermentation bacteria; the wastewater treated by the adjusting tank 2 enters the primary sedimentation tank 1. The primary sedimentation tank 1 and the adjusting tank 2 form a raw water pretreatment system.
Wherein, the primary sedimentation tank is provided with a water inlet and a water outlet, the interior of the primary sedimentation tank is provided with a sludge pump, and the front of the water inlet of the primary sedimentation tank is provided with a switch valve ten 10; the regulating reservoir is provided with a water inlet and a water outlet, and a switch valve nine 9 is arranged between the raw water and the water inlet of the regulating reservoir. When the quality of the raw wastewater is strong in toxicity to the subsequent anaerobic fermentation sludge, the regulating tank is started, and the water outlet of the regulating tank is connected with the water inlet of the primary sedimentation tank. When the raw water quality of the wastewater is suitable for fermentation or microalgae culture, the switch valve ten 10 is opened, and the switch valve nine 9 is closed. The wastewater directly enters a sedimentation tank for treatment.
The upflow anaerobic sludge bed reactor is provided with a water inlet, a water outlet, a sludge discharge port, a methane outlet and a methane heat supply and heat preservation anaerobic fermentation reactor device; a valve twelve 12 is arranged between the primary sedimentation tank and the water inlet of the upflow anaerobic sludge blanket reactor; the secondary sedimentation tank is provided with a water inlet and a water outlet, and a sludge pump is arranged inside the secondary sedimentation tank; the water outlet of the upflow anaerobic sludge blanket reactor is connected with the water inlet of the secondary sedimentation tank.
The raceway pond microalgae reactor and the biomembrane microalgae reactor are respectively provided with a water inlet, a water outlet, a paddle wheel and an air supplementing device; eleven valves 11 are arranged at the water outlet of the primary sedimentation tank and the water inlet of the microalgae bioreactor; a valve thirteen 13 and a valve fourteen 14 are respectively arranged at the water inlets of the raceway pond microalgae reactor and the biomembrane microalgae reactor; the microalgae harvesting 7 is provided with a water inlet, a water outlet and a microalgae slurry discharge hole. The water outlet of the microalgae harvesting unit 7 is communicated with the wastewater post-treatment water inlet.
The livestock and poultry breeding wastewater is subjected to a raw water pretreatment system to remove suspended matters in the wastewater, and the toxicity of the wastewater on the growth of microorganisms is adjusted and reduced; the pretreated effluent is degraded by a large amount of harmful substances in the wastewater through an anaerobic fermentation treatment system, and especially the COD of the wastewater is greatly reduced; the fermented biogas slurry is subjected to microalgae culture treatment by using organic matters, ammonia nitrogen, phosphorus and the like in the wastewater to synthesize microalgae self-constituent components, reduce COD (chemical oxygen demand) of the wastewater and remove most of ammonia nitrogen and phosphorus; and (4) after the microalgae cells are collected and removed, the wastewater is subjected to wastewater post-treatment to remove part of pollutants, and then enters a clean water tank to reach the discharge standard and be discharged.
When the initial COD of the raw water of the culture wastewater is lower than 3000mg/L, the culture wastewater can be directly subjected to microalgae culture treatment without anaerobic fermentation treatment after passing through a raw water pretreatment system; when the water quality of the wastewater after the microalgae culture treatment basically meets the discharge standard, the wastewater can directly enter a disinfection tank for disinfection and then enters a clean water tank for discharge.
The system comprises the following specific processes: when the water quality of the raw water of the wastewater is strong in toxicity to anaerobic fermentation bacteria, opening a switch valve 9 and closing a switch valve ten 10, wherein the raw water firstly enters a regulating tank 2 and then enters a primary sedimentation tank 1 after being regulated, and the raw water of the aquaculture wastewater is subjected to solid suspension sedimentation in the primary sedimentation tank 1; closing the eleven valve 11, opening the twelve valve 12, and allowing the biogas to enter the upflow anaerobic sludge bed reactor 3 for anaerobic fermentation, wherein the generated biogas can be used for power generation and heat supply and heat preservation for the fermentation reactor; the fermentation tail liquid enters a secondary sedimentation tank 4, after the residual sludge is removed through sedimentation, the fermentation tail liquid is selectively introduced into a microalgae raceway tank reactor 5 or a microalgae biomembrane reactor 6 for microalgae culture according to the water quality condition of biogas slurry wastewater, and the selective use of the microalgae bioreactor is controlled by a valve thirteen 13 and a valve fourteen 14; when the COD of the raw wastewater is lower than 3000mg/L, after the raw wastewater is treated by the primary sedimentation tank 1, the valve eleven 11 is opened, the valve twelve 12 is closed, and the wastewater is directly introduced into the microalgae runway pool reactor 5 or the microalgae biofilm reactor 6 for microalgae culture; after the contents of COD, ammonia nitrogen, phosphorus and metal ions in the wastewater are reduced through the growth of microalgae, the microalgae are collected, and the obtained high-concentration algae slurry can be used as an algae organic fertilizer raw material for utilization; the liquid without the microalgae enters a wastewater post-treatment link and is treated and discharged.
In specific implementation, the method can be implemented according to the following process flows according to different wastewater qualities:
in the first process, as shown in fig. 2, a switch valve nine 9 is opened, and raw water of livestock and poultry breeding wastewater is pretreated by a regulating tank 2 and a primary sedimentation tank 1; opening a switch valve twelve 12, after the wastewater is fermented by the upflow anaerobic sludge bed reactor 3, settling biogas slurry in a secondary sedimentation tank 4 to remove residual sludge, wherein the biogas can be used for heat supply, heat preservation and power generation of the fermentation reactor; opening a valve thirteen 13, introducing the fermented biogas slurry into a raceway pond microalgae reactor 5, and harvesting microalgae 7 after a growth culture period of a certain period to obtain high-concentration algae slurry serving as an algae organic fertilizer; and (3) after the wastewater from which the microalgae cells are removed reaches the wastewater discharge standard through the post-treatment 8, introducing the wastewater into a clean water tank for discharging. The waste water in the clean water tank can also be used as a water source of the regulating tank. When the dissolved oxygen/antibiotic content of raw water of the culture wastewater is too high, COD is too high, and daily discharge is small, the process route is preferentially selected for wastewater treatment.
Step two, as shown in fig. 3, a switch valve 9 is opened, and the raw water of the livestock and poultry breeding wastewater is pretreated by a regulating tank 2 and a primary sedimentation tank 1; opening a valve twelve 12, after the wastewater is fermented by the upflow anaerobic sludge bed reactor 3, settling biogas slurry in a secondary sedimentation tank 4 to remove residual sludge, wherein the biogas can be used for heat supply, heat preservation and power generation of the fermentation reactor; opening a valve fourteen 14, introducing the fermented biogas slurry into a biomembrane microalgae reactor 6, and periodically harvesting microalgae 7 after the growth culture of the microalgae to obtain high-concentration microalgae slurry which is used as an algae organic fertilizer; and (3) after the wastewater from which the microalgae cells are removed reaches the wastewater discharge standard through the post-treatment 8, introducing the wastewater into a clean water tank for discharging. The waste water in the clean water tank can also be used as a water source of the regulating tank. When the dissolved oxygen/antibiotic content of the raw water of the aquaculture wastewater is too high, the COD is high, and the daily discharge amount is large, the process route is preferentially selected for wastewater treatment.
In the third process, as shown in fig. 4, a switch valve ten 10 is opened, and the raw water of the livestock and poultry breeding wastewater is pretreated by a primary sedimentation tank 1; opening a valve twelve 12, after the wastewater is fermented by the upflow anaerobic sludge bed reactor 3, settling biogas slurry in a secondary sedimentation tank 4 to remove residual sludge, wherein the biogas can be used for heat supply, heat preservation and power generation of the fermentation reactor; opening a valve thirteen 13, introducing the fermented biogas slurry into a raceway pond microalgae reactor 5, and harvesting microalgae 7 after a growth culture period of a certain period to obtain high-concentration algae slurry serving as an algae organic fertilizer; and (3) after the wastewater from which the microalgae cells are removed reaches the wastewater discharge standard through the post-treatment 8, introducing the wastewater into a clean water tank for discharging. When the COD of the raw water of the culture wastewater is moderate and the daily discharge amount is small, the process route is preferentially selected for wastewater treatment.
Step four, as shown in fig. 5, a switch valve 10 is opened, and the raw water of the livestock and poultry breeding wastewater is pretreated by a primary sedimentation tank 1; opening a valve twelve 12, after the wastewater is fermented by the upflow anaerobic sludge bed reactor 3, settling biogas slurry in a secondary sedimentation tank 4 to remove residual sludge, wherein the biogas can be used for heat supply, heat preservation and power generation of the fermentation reactor; opening a valve fourteen 14, introducing the fermented biogas slurry into a biomembrane microalgae reactor 6, and periodically harvesting microalgae 7 after the growth culture of the microalgae to obtain high-concentration microalgae slurry which is used as an algae organic fertilizer; and (3) after the wastewater from which the microalgae cells are removed reaches the wastewater discharge standard through the post-treatment 8, introducing the wastewater into a clean water tank for discharging. When the COD of the raw water of the culture wastewater is moderate and the daily discharge amount is large, the process route is preferentially selected for wastewater treatment.
Step five, as shown in fig. 6, the raw water of the livestock and poultry breeding wastewater is pretreated by a primary sedimentation tank 1; opening a switch valve ten 10 and a valve fourteen 14, introducing the wastewater into a biomembrane microalgae reactor 6, and periodically harvesting microalgae 7 after the growth culture of the microalgae to obtain high-concentration algae slurry serving as an algae organic fertilizer; and (3) after the wastewater from which the microalgae cells are removed reaches the wastewater discharge standard through the post-treatment 8, introducing the wastewater into a clean water tank for discharging. When the COD of the raw water of the aquaculture wastewater is low and the daily discharge is large, the process route is preferentially selected for wastewater treatment.
step one, feeding the culture wastewater into a primary sedimentation tank 1 through a switch valve ten 10, wherein the primary sedimentation tank 1 is used for settling solid particles in the wastewater, so that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank 1 enters an upflow anaerobic sludge blanket reactor 3 through a valve twelve 12;
when the livestock and poultry breeding wastewater has strong toxicity to anaerobic fermentation bacteria, for example, when the concentration of antibiotics such as tetracycline is higher than 8.5mg/kg or the dissolved oxygen in the wastewater is higher than 0.3mg/L, the breeding wastewater enters the regulating tank 2 through the switch valve nine 9; the adjusting tank 2 stores and adjusts the water inflow of wastewater treatment, reduces the dissolved oxygen of the wastewater and reduces the toxicity of the wastewater to anaerobic fermentation bacteria; and then the wastewater treated by the adjusting tank 2 is discharged into a primary sedimentation tank 1. The primary sedimentation tank 1 is used for settling solid particles in the wastewater to ensure that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank 1 enters an upflow anaerobic sludge blanket reactor 3 through a valve twelve 12;
secondly, the upflow anaerobic sludge blanket reactor 3 carries out anaerobic fermentation on the influent livestock wastewater, reduces the COD of the wastewater, generates biological methane and reasonably utilizes the chemical energy of pollutants in the wastewater; the biological methane is discharged through an exhaust port, and the wastewater treated by the upflow anaerobic sludge blanket reactor 3 is discharged into a secondary sedimentation tank 4;
step three, the secondary sedimentation tank 4 stores the wastewater, reduces the content of solid suspended matters in the wastewater, and adjusts the water inflow of the subsequent microalgae culture; when the COD concentration of the wastewater treated by the secondary sedimentation tank 4 is lower than a set value, discharging the treated wastewater into a raceway pond microalgae reactor 5 through a valve thirteen 13 for microalgae culture, and entering a step four; when the COD concentration of the wastewater treated by the secondary sedimentation tank 4 is higher than a set value, the treated wastewater is discharged into a biofilm microalgae reactor 6 through a valve fourteen 14 for microalgae culture; step five is entered
Step four, the raceway pond microalgae reactor 5 utilizes a fermentation biogas slurry suspension method to culture microalgae, reduces the content of ammonia nitrogen, phosphorus and COD in the wastewater, and obtains high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the raceway pond microalgae reactor 5 and the treated wastewater into a microalgae harvesting unit 7, and entering a sixth step;
step five, the biomembrane microalgae reactor 6 is used for culturing microalgae by utilizing a fermentation biogas slurry biomembrane method, reducing the content of ammonia nitrogen, phosphorus and COD in the wastewater and obtaining high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the biomembrane microalgae reactor 6 and the treated wastewater into microalgae harvesting 7;
step six, the microalgae harvesting 7 separates microalgae biomass from the treated wastewater to obtain microalgae biomass byproducts; the wastewater separated by the microalgae harvesting 7 is discharged into a wastewater post-treatment 8;
and step seven, the wastewater post-treatment 8 adjusts the chromaticity of the wastewater and carries out sterilization, so that the wastewater reaches the discharge standard.
Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the claims.
Claims (4)
1. A system for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled microalgae organisms comprises a primary sedimentation tank (1), a regulating tank (2), an upflow anaerobic sludge bed reactor (3), a secondary sedimentation tank (4), a runway pool microalgae reactor (5), a biomembrane microalgae reactor (6), microalgae harvesting (7) and wastewater post-treatment (8); the method is characterized in that:
the culture wastewater enters a primary sedimentation tank (1) through a switch valve (10), and the primary sedimentation tank (1) is used for settling solid particles in the wastewater to ensure that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank (1) enters an upflow anaerobic sludge blanket reactor (3) through a valve twelve (12);
the upflow anaerobic sludge blanket reactor (3) is used for anaerobic fermentation of livestock wastewater, reduces COD of the wastewater and generates biogas; the biological methane is discharged through an exhaust port, and the wastewater treated by the upflow anaerobic sludge blanket reactor (3) enters a secondary sedimentation tank (4);
the secondary sedimentation tank (4) is used for storing wastewater and reducing the content of solid suspended matters in the wastewater, the wastewater treated by the secondary sedimentation tank (4) enters the raceway pond microalgae reactor (5) through a valve thirteen (13) for microalgae culture or enters the biomembrane microalgae reactor (6) through a valve fourteen (14) for microalgae culture;
the raceway pond microalgae reactor (5) is used for culturing microalgae by utilizing a fermentation biogas slurry suspension method, reducing the content of ammonia nitrogen, phosphorus and COD in wastewater and obtaining high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the raceway pond microalgae reactor (5) and the treated wastewater into microalgae harvesting (7); the biomembrane microalgae reactor (6) is used for culturing microalgae by utilizing a fermentation biogas slurry biomembrane method, reducing the content of ammonia nitrogen, phosphorus and COD in wastewater and obtaining high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the biomembrane microalgae reactor (6) and the treated wastewater into microalgae harvesting (7);
the microalgae harvesting (7) is used for separating microalgae biomass from the treated wastewater to obtain microalgae biomass byproducts; the wastewater separated by the microalgae harvesting (7) is discharged into a wastewater post-treatment (8);
and the wastewater post-treatment (8) is used for adjusting the chromaticity of the wastewater and sterilizing the wastewater so as to ensure that the wastewater reaches the discharge standard.
2. The system for treating livestock breeding wastewater by anaerobic fermentation coupled with microalgae organisms according to claim 1, is characterized in that: the breeding wastewater enters the adjusting tank (2) through a switch valve nine (9); the adjusting tank (2) is used for storing and adjusting the water inflow of wastewater treatment, reducing the dissolved oxygen of the wastewater or reducing the toxicity of the wastewater to anaerobic fermentation bacteria; the wastewater treated by the adjusting tank (2) enters the primary sedimentation tank (1).
3. A method for a system for treating livestock and poultry breeding wastewater by anaerobic fermentation coupled with microalgae organisms is characterized by comprising the following steps: the method comprises the following steps:
step one, feeding the culture wastewater into a primary sedimentation tank (1) through a switch valve (10), wherein the primary sedimentation tank (1) is used for settling solid particles in the wastewater, so that the wastewater is suitable for fermentation or microalgae culture; the wastewater treated by the primary sedimentation tank (1) enters an upflow anaerobic sludge blanket reactor (3) through a valve twelve (12);
secondly, the upflow anaerobic sludge blanket reactor (3) carries out anaerobic fermentation on the influent livestock wastewater, reduces the COD of the wastewater and generates biological methane; the biological methane is discharged through an exhaust port, and the wastewater treated by the upflow anaerobic sludge blanket reactor (3) is discharged into a secondary sedimentation tank (4);
step three, the secondary sedimentation tank (4) stores the wastewater to reduce the content of suspended solid in the wastewater; when the COD concentration of the wastewater treated by the secondary sedimentation tank (4) is lower than a set value, discharging the treated wastewater into a raceway pond microalgae reactor (5) through a valve thirteen (13) for microalgae culture, and entering a step four; when the COD concentration of the wastewater treated by the secondary sedimentation tank (4) is higher than a set value, the treated wastewater is discharged into a biofilm microalgae reactor (6) through a valve fourteen (14) for microalgae culture; entering the step five;
step four, the raceway pond microalgae reactor (5) utilizes a fermentation biogas slurry suspension method to culture microalgae, reduces the content of ammonia nitrogen, phosphorus and COD in wastewater, and obtains high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the raceway pond microalgae reactor (5) and the treated wastewater into a microalgae harvesting step (7), and entering a sixth step;
fifthly, the biomembrane microalgae reactor (6) is used for culturing microalgae by utilizing a fermentation biogas slurry biomembrane method, reducing the content of ammonia nitrogen, phosphorus and COD in the wastewater and obtaining high-concentration microalgae slurry; discharging the high-concentration algae slurry obtained by the biomembrane microalgae reactor (6) and the treated wastewater into microalgae harvesting (7);
step six, the microalgae harvesting (7) separates microalgae biomass from the treated wastewater to obtain microalgae biomass byproducts; the wastewater separated by the microalgae harvesting (7) is discharged into a wastewater post-treatment (8);
and step seven, adjusting the chromaticity of the wastewater and sterilizing the wastewater after the wastewater is treated (8) so that the wastewater reaches the discharge standard.
4. The method for treating livestock and poultry breeding wastewater system by anaerobic fermentation coupled with microalgae organism as claimed in claim 3, wherein: when the livestock and poultry breeding wastewater has strong toxicity to anaerobic fermentation bacteria, the breeding wastewater enters the regulating tank (2) through the switch valve nine (9); the adjusting tank (2) stores and adjusts the water inflow of wastewater treatment, reduces the dissolved oxygen of the wastewater and reduces the toxicity of the wastewater to anaerobic fermentation bacteria; and then the wastewater treated by the regulating tank (2) is discharged into the primary sedimentation tank (1).
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