CN108975614B

CN108975614B - Operation method of biogas slurry ecological treatment culture system

Info

Publication number: CN108975614B
Application number: CN201810860296.2A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Cai Huiping
Priority date: 2016-06-06
Filing date: 2016-06-06
Publication date: 2021-03-26
Anticipated expiration: 2036-06-06
Also published as: CN105859049B; CN108975615A; CN105859049A; CN108975614A; CN108975615B

Abstract

The invention provides an operation method of a biogas slurry ecological treatment breeding system. The biogas slurry ecological treatment and breeding system includes solid-liquid separation ponds, decomposition treatment ponds, aeration treatment ponds, acid-base adjustment ponds, algae cultivation ponds, animal cultivation ponds, solid-liquid separation ponds, and decomposition treatment ponds arranged in the order of the treatment process. , aeration treatment pond, acid-base adjustment pond, algae cultivation pond and animal cultivation pond are connected end to end in sequence through the connecting port; Aerobic catabolism treatment, aeration treatment tank for aeration treatment of biogas slurry, acid-base adjustment tank to supplement and adjust the concentration, pH and nutrient composition of biogas slurry, algae cultivation in algae cultivation tank, and use of biogas slurry and biogas to adjust the concentration of biogas slurry. Algae provide nutrients, algae purify biogas slurry and biogas, and isolate a variety of aquatic products in animal culture ponds, and algae provide the main feed. The invention forms a cyclic ecological breeding industry and improves the environment.

Description

Operation method of biogas slurry ecological treatment culture system

Technical Field

The invention belongs to the technical field of biogas slurry treatment, relates to biogas slurry purification culture, and particularly relates to a biogas slurry ecological treatment culture system and an operation method thereof.

Background

Biogas slurry, also called "anaerobic fermentation broth", is a water-soluble byproduct remaining after anaerobic fermentation of organic matters such as animal waste and straws. With the adjustment of agricultural industrial structure and the construction of new rural areas, the intensive livestock and poultry breeding industry develops rapidly, and as biogas slurry which is a product after anaerobic fermentation of biogas, the waste liquid is used as agricultural fertilizer or directly discharged, and whether the discharge reaches the standard or not and the agricultural safety are rarely considered. In fact, biogas slurry after anaerobic digestion still contains a large amount of nitrogen, phosphorus and metals and is considered as high-concentration sewage.

Biogas generated by anaerobic digestion of organic solid wastes is a clean biomass energy, but the amount of generated anaerobic digestion liquid is large, biogas slurry generated by biogas engineering in China reaches more than 2 hundred million tons every year, and the problem of aftertreatment of the anaerobic digestion liquid becomes one of the main bottlenecks restricting the development of biogas industry. At present, anaerobic digestion liquid is generally used as agricultural fertilizer or directly discharged, and whether the discharge reaches the standard or not and the agricultural safety are seldom considered. In fact, biogas slurry after anaerobic digestion still contains a considerable amount of organic pollutants, wherein the pressure on the environment is still large due to Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), suspended matters (SS), ammonia nitrogen (NH 3-N) and Total Phosphorus (TP). Therefore, it is necessary to develop a harmless and recycling treatment technology for biogas slurry with low investment, low energy consumption and high efficiency to solve the bottleneck problem of biogas fermentation and realize resource recycling.

The method for purifying biogas slurry is mainly researched by continuously using an urban sewage treatment method, and adopts methods such as physical, chemical and biological methods, such as natural biological treatment methods such as a biological pond method and an artificial wetland, and industrial treatment modes adopting reactors such as MBR, SBR and reverse osmosis, but at present, the methods are difficult to popularize in farmers due to the characteristics of high operation cost, high operation technical difficulty and the like, and the method has a not very obvious effect of removing N, P in water, so that the direct discharge of biogas slurry after simple aeration treatment is still the main treatment mode at present. Some biogas slurry is used for farmland irrigation, biogas slurry seed soaking, foliage spraying, soilless culture and the like, but due to the problems of transportation cost, application safety and the like, the usage amount of the biogas slurry is small, a large amount of biogas slurry generated by anaerobic fermentation of the large-scale aquaculture cannot be consumed, and therefore direct discharge is still the main treatment mode of the biogas slurry at present.

The microalgae is an autotrophic plant with wide land and ocean distribution, rich nutrition and high photosynthetic utilization rate, and can utilize a nitrogen source, a carbon source and a phosphorus source in the biogas slurry after anaerobic fermentation to perform photoautotrophic growth and synthesize organic matters such as amino acid, protein, phospholipid and the like, thereby removing nitrogen and phosphorus from the biogas slurry and realizing nutrient recovery and resource utilization. The microalgae-treated biogas slurry wastewater can purify wastewater, and can also obtain environment value-added energy and other high value-added products, thereby having great significance for realizing social sustainable development.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a biogas slurry ecological treatment culture system and an operation method thereof, wherein biogas slurry is firstly subjected to primary treatment and then is used for algae culture to provide nutrients, algae is further used as animal feed, biogas slurry residue is used as farmland fertilizer, poultry are fed by algae, aquatic products and feed, and excrement of the poultry is used as a raw material of the biogas slurry to form recyclable ecological culture.

The purpose of the invention can be realized by the following technical scheme: a biogas slurry ecological treatment culture system comprises a solid-liquid separation tank, a decomposition treatment tank, an aeration treatment tank, an acid-base regulation tank, an algae culture tank and an animal culture tank which are arranged according to a treatment process sequence, wherein the solid-liquid separation tank, the decomposition treatment tank, the aeration treatment tank, the acid-base regulation tank, the algae culture tank and the animal culture tank are sequentially connected in series end to end through connectors; a poultry house is arranged above the solid-liquid separation tank, poultry is cultured in the poultry house, a grid floor is arranged at the bottom of the poultry house, and the lower part of the grid floor is connected with the solid-liquid separation tank through a drainage pipe; the solid-liquid separation tank is provided with a liquid inlet end and a liquid outlet end, a liquid inlet is formed in the bottom of the liquid inlet end, a multistage step which is gradually raised is arranged on the inner side of the liquid outlet end, a liquid outlet is formed in the top of the liquid outlet end, the multistage step is provided with a net-shaped step surface, a slag discharge pipe is arranged at the bottom of the liquid outlet end, a valve is arranged on the slag discharge pipe, the slag discharge pipe is connected with an experimental farmland, the experimental farmland is used for planting poultry feed or crops, and the solid-liquid separation tank is connected with a sterilizer through a pipeline; the top of one side of the decomposition treatment tank is provided with a liquid inlet, the top of the other side of the decomposition treatment tank is provided with a liquid outlet, the liquid outlet is higher than the liquid inlet, a biological membrane is arranged in the decomposition treatment tank and sequentially comprises a filter material layer, an anaerobic layer and an aerobic layer from bottom to top, an attachment liquid layer is formed on the upper surface of the aerobic layer, a flowing liquid layer is formed on the upper surface of the attachment liquid layer, and the anaerobic layer and the aerobic layer are gradually raised along the liquid flowing direction; the top of one side of the aeration treatment tank is provided with a liquid inlet, the top of the other side of the aeration treatment tank is provided with a liquid outlet, the bottom of the aeration treatment tank is provided with a plurality of air supply nozzles, the air supply nozzles are connected with an air supply pump through pipelines, a plurality of partition plates which are arranged in parallel are arranged in the aeration treatment tank, and the partition plates are provided with honeycomb hole structures; the acid-base adjusting tank is connected with an adjusting agent box through a medicine supply pipe, a flow valve is arranged on the medicine supply pipe, an acid-base detector is arranged in the acid-base adjusting tank, and a stirring paddle is further arranged in the acid-base adjusting tank; the top of one side of the algae culture pond is a liquid inlet, the top of the other side of the algae culture pond is provided with a liquid outlet, the liquid outlet is higher than the liquid inlet, a culture medium is laid at the bottom of the algae culture pond, a covering layer is arranged on the top surface of the culture medium, the upper part of an inner cavity of the algae culture pond is provided with an algae cutting assembly, the algae cutting assembly comprises a pair of cutting net racks with reverse strokes, each cutting net rack is connected by a driving machine, and the grid edges of the cutting net racks form cutting edges; the top of pond one side is cultivateed to the animal is the inlet, and the opposite side bottom sets up the drain, the pond is cultivateed to the animal is through oxygen supply union coupling pump oxygen machine, the pond is cultivateed to the animal through trading water piping connection and trading the water pump, the top of pond is cultivateed to the animal sets up the sky shade, the sky shade has expansion bracket and collapsible top facing.

In the biogas slurry ecological treatment breeding system, the solid-liquid separation tank, the decomposition treatment tank, the aeration treatment tank, the acid-base regulation tank, the algae culture tank and the animal culture tank can be arranged in a line in sequence, and can also be arranged in multiple lines according to an operation site, so long as the process sequence of liquid flow is ensured to be correct through structures such as pipelines.

The solid-liquid separation tank mainly utilizes the sedimentation characteristic to settle turbid impurities in the biogas slurry, and sends clear liquid flow to the next process tank, and the multistage steps and the mesh-shaped step surfaces thereof prevent overlarge impurities from floating at the liquid outlet in the sedimentation process so as to prevent the impurities from entering the next process tank.

The anaerobic layer and the aerobic layer in the decomposition treatment tank form an inclined slope from thin to thick from the liquid inlet end to the liquid outlet end, so that the liquid flow speed is reduced, the contact time and the contact area of liquid flow and a biological membrane are further increased, and the reaction effect is enhanced.

The aeration treatment tank is additionally provided with a plurality of partition plates, and the circulation of space is formed through honeycomb holes on the partition plates, so that on one hand, the turbulence degree of inflow liquid is increased, and on the other hand, the overflowing speed of oxygen passing through the liquid is slowed down, and the combination action time and the combination degree of gas and liquid are enhanced.

The pH value of the biogas slurry is adjusted in the pH adjusting tank, and the adjustment of specific nutrient components refers to the supplement adjustment of the concentration, the pH value and nutrient salt components of the biogas slurry.

The algae subassembly that cuts in the algae culture pond is bilateral symmetry structure, specifically includes that a left driving machine connects a cutting rack, and a cutting rack is connected to the driving machine on right side, all sets up the net square hole that the specification equals on the cutting rack, and under the normal condition, the ascending growth of algae passes the net square hole, and when needing the cutting, the driving machine stimulates the cutting rack respectively left or right for the net square hole looks alternate of two cutting racks, and then cuts off the top portion of algae through the hank cutting effect of both sides cutting edge.

The animal culture pond can be divided into a plurality of isolated culture areas, and each isolated culture area can be used for feeding aquatic products of the same kind, so that different species can be separated to avoid factors such as mutual casualties. The foldable cover of the sunshade can be set to be light-tight or semi-light-tight, and can be shielded or not shielded according to weather conditions and aquatic characteristics.

In the biogas slurry ecological treatment culture system, the top of the decomposition treatment tank is provided with a biogas collection cover which is communicated with the middle part of the algae culture tank through an air pipeline, and the air pipeline is connected in series with a deodorization filter and a methane absorber. The main component of the methane subjected to deodorization and methane removal is carbon dioxide, and gas containing a large amount of carbon dioxide is introduced into the algae culture pond to contribute to efficient propagation and growth of algae.

In foretell natural pond liquid ecological treatment farming systems, the inside of decomposition treatment pond has the U type to lead to the chamber, the inlet that decomposes treatment pond is connected to one side port in the U type to lead to the chamber, and the liquid outlet that decomposes treatment pond is connected to another side port. The biomembrane is located the bottom that the cavity was led to the U type, and the liquid stream that gets into the decomposition processing pond from the inlet need lead to the cavity through the U type and just can reach the liquid outlet, must carry out aerobic treatment through the biomembrane from this, and then effectively ensure the contact reaction of natural pond liquid and biomembrane, improve aerobic treatment effect, the turbidity of better adjustment natural pond liquid and the concentration of nutrients such as nitrogen, phosphorus to adapt to follow-up algae growth.

In the biogas slurry ecological treatment culture system, the thickness of the culture medium is 30-60 cm; the covering layer is provided with a plurality of ceramic particles, the diameter of each ceramic particle is 10-30 mm, a plurality of holes are formed in the ceramic particles, and the thickness of the covering layer is 6-15 cm. The porous characteristic of the ceramic particles can be utilized to carry and store more oxygen in water, and meanwhile, nutrients in the water can be attached, so that beneficial growth assistance to the algae is provided.

In the biogas slurry ecological treatment culture system, a water level measurer is arranged in the algae culture pond, a lifting dam is arranged at the liquid outlet of the algae culture pond, a filter screen is arranged at the top of the lifting dam, and the diameter of a mesh of the filter screen is 10 cm-15 cm. The actual water level height is measured by the water level measurer, and then the lifting height of the lifting dam is operated according to the measured value, so that the water flow can enter the next process pool at a certain speed and quantity, and meanwhile, the operation effect of instantaneous water supplement or instantaneous closure can be performed on the next process pool. The oversize algae leaves are retained in the algae culture pond through the filter screen, so that the water quality is prevented from being polluted due to the fact that the oversize algae leaves cannot be eaten by the raised animals.

The operation method of the biogas slurry ecological treatment breeding system comprises the following steps:

1) firstly, untreated biogas slurry enters a solid-liquid separation tank through a liquid inlet, the flow rate of the biogas slurry is not more than 50m/h, the biogas slurry is gradually accumulated and ascends in the solid-liquid separation tank, meanwhile, a proper amount of disinfectant is added into the solid-liquid separation tank by using a disinfector, turbid impurities in the biogas slurry sink to the bottom of the tank, relatively clear liquid is positioned at the upper part until the solid-liquid separation tank is full, the clear liquid slowly flows out from the liquid outlet, a valve on a slag discharge pipe is opened at intervals, and the impurities deposited at the bottom of the tank are discharged;

2) the settled biogas slurry sequentially enters a decomposition treatment tank, the flow rate of the biogas slurry does not exceed 40m/h, the biogas slurry and an anaerobic layer and an aerobic layer of a biological membrane at the bottom of the tank respectively perform anaerobic and aerobic actions, organic matters in the biogas slurry are decomposed and metabolized through anaerobic reaction to promote formation of biogas, and the organic matters in the biogas slurry are subjected to oxidative decomposition through aerobic reaction;

3) further precipitating impurities in the decomposed biogas slurry in a decomposition treatment tank, then sequentially introducing clarified liquid into an aeration treatment tank, starting an air supply pump, adding a large amount of air into the biogas slurry through a plurality of air supply nozzles, and enhancing the turbulence degree, contact area and time of the gas and the liquid due to the blocking of the structure of a plurality of partition plates so as to dissolve more air in the biogas slurry;

4) the aerated biogas slurry is further precipitated with impurities in an aeration treatment tank, then the clarified liquid of the aerated biogas slurry sequentially enters an acid-base regulation tank, the pH value of the biogas slurry is monitored by an acid-base detector, then the flow valve is controlled to be opened according to the required pH value standard, a proper amount of medicament is injected into the biogas slurry by regulating a medicament box, the stirring paddle is started to stir so that the concentration of the biogas slurry is consistent, and the concentration, the pH value and the nutrient content of the biogas slurry can be regulated in the acid-base regulation tank;

5) further precipitating impurities in the adjusted biogas slurry in an acid-base adjusting tank, then sequentially feeding clarified liquid into an algae culture tank, planting the roots of algae growing in the algae culture tank into a culture medium, fixing the algae through an upper covering layer, fixing carbon dioxide in the biogas by the algae under the photosynthesis, growing and propagating by using inorganic salts such as inorganic nitrogen, phosphorus and the like in the biogas slurry as nutrient sources, and simultaneously realizing water body purification of the biogas slurry; the tops of the algae are periodically cut by using the algae cutting assembly, and the cut algae leaves enter the next process pool along with the purified water body to be used as feed;

6) purifying and finally precipitating the biogas slurry in an algae culture pond, then sequentially introducing clarified liquid into an animal culture pond, starting a water exchange pump, pumping water into the animal culture pond through a water exchange pipe, supplementing required water, properly diluting the concentration of the biogas slurry, simultaneously starting an oxygen pumping machine to provide oxygen into the animal culture pond through an oxygen supply pipe, taking algae leaves as main feed in the animal culture pond, matching with proper auxiliary feed, and regularly opening a drain outlet to discharge residues and excrement impurities deposited at the bottom of the pond;

7) the deposited impurities at the bottom of the solid-liquid separation tank are periodically discharged to an experimental cultivated land and are used as poultry feed or fertilizer for crops to promote the growth of the poultry feed or the fertilizer; the poultry obtains food sources through the algae in the algae culture pond and/or the aquatic products in the animal culture pond and/or the poultry feed in the experimental cultivated land; excrement produced by the poultry raised in the poultry house falls into the drainage pipe through the grid floor and then enters the solid-liquid separation tank to be used as a raw material of biogas slurry.

In the operation method, in the step 1), the disinfectant is a sodium hypochlorite solution with the concentration of 8-10%, the addition amount of the disinfectant is 1-3 mL/L, and then the disinfectant is neutralized by sodium thiosulfate with the same concentration, wherein the mass fraction% of effective chlorine of the sodium hypochlorite solution is more than or equal to 10.0.

In the operation method, in the step 2), biogas formed by metabolizing biogas slurry in the decomposition treatment pool is collected, then methane components in the biogas are absorbed and odor is removed, and the biogas is conveyed to the algae culture pool through a pipeline, so that residual carbon dioxide gas in the biogas contributes to the propagation and growth of algae.

In the operation method, in the step 3), quicklime with the water volume of 0.3-0.5 per mill is added in the aeration process, and after 24 hours of continuous aeration, the continuous aeration is carried out for 24 hours at intervals of 3 hours, and then the precipitation is carried out for 2 hours.

In the operation method, in the step 6), the animal culture pond is divided into a plurality of independent isolated culture areas, and the fairy shrimp, the tubificidae, the snail and the ornamental fish are respectively cultured.

Compared with the prior art, the biogas slurry ecological treatment culture system and the operation method thereof utilize high-content nitrogen and phosphorus inorganic salt in the biogas slurry, so that the biogas slurry is treated to be used as nutrition of algae to provide energy, and simultaneously, carbon dioxide in the biogas is used as algae culture raw materials, thereby not only solving the problem of the cost of algae culture, but also purifying and utilizing the biogas and the biogas slurry, reducing the environmental pollution of the biogas slurry, further carrying out animal breeding through algae propagation, optimizing the water quality of animal breeding, improving the environment and increasing the economic, social and ecological benefits; in addition, the biogas slurry is subjected to primary treatment, then is used for providing nutrients for algae cultivation, further algae is used as feed for animal feeding, biogas slurry residues are used as farmland fertilizer, the poultry are fed by the algae, aquatic products and the feed, and excrement of the poultry is used as raw materials of the biogas slurry to form recyclable ecological cultivation.

Drawings

FIG. 1 is an overall schematic diagram of the biogas slurry ecological treatment culture system.

In the figure, 1, a solid-liquid separation tank; 101. a plurality of steps; 102. a slag discharge pipe; 2. a decomposition treatment tank; 201. a biogas collection cover; 202. a biofilm; 3. an aeration treatment tank; 301. a gas supply nozzle; 302. a partition plate; 4. an acid-base adjusting tank; 401. a stirring paddle; 5. an algae culture pond; 501. a culture medium; 502. a cover layer; 503. lifting the dam; 504. cutting the net rack; 6. an animal culture pond; 601. a sewage draining outlet; 602. a sun shade.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the biogas slurry ecological treatment culture system comprises a solid-liquid separation tank 1, a decomposition treatment tank 2, an aeration treatment tank 3, an acid-base regulation tank 4, an algae culture tank 5 and an animal culture tank 6 which are arranged according to a treatment process sequence, wherein the solid-liquid separation tank 1, the decomposition treatment tank 2, the aeration treatment tank 3, the acid-base regulation tank 4, the algae culture tank 5 and the animal culture tank 6 are sequentially connected in series end to end through connectors; a poultry house is arranged above the solid-liquid separation tank 1, poultry is cultured in the poultry house, a grid floor is arranged at the bottom of the poultry house, and the lower part of the grid floor is connected with the solid-liquid separation tank 1 through a drainage pipe; the solid-liquid separation tank 1 is provided with a liquid inlet end and a liquid outlet end, a liquid inlet is arranged at the bottom of the liquid inlet end, a multistage step 101 which is gradually raised is arranged at the inner side of the liquid outlet end, a liquid outlet is arranged at the top of the liquid outlet end, the multistage step 101 is provided with a net-shaped step surface, a slag discharge pipe 102 is arranged at the bottom of the liquid outlet end, a valve is arranged on the slag discharge pipe 102, the slag discharge pipe 102 is connected with an experimental farmland for planting poultry feed or crops, and the solid-liquid separation tank 1 is connected with a sterilizer through a pipeline; a liquid inlet is formed in the top of one side of the decomposition treatment tank 2, a liquid outlet is formed in the top of the other side of the decomposition treatment tank 2, the liquid outlet is higher than the liquid inlet, a biological membrane 202 is arranged in the decomposition treatment tank 2, the biological membrane 202 sequentially comprises a filter material layer, an anaerobic layer and an aerobic layer from bottom to top, an attachment liquid layer is formed on the upper surface of the aerobic layer, a flowing liquid layer is formed on the upper surface of the attachment liquid layer, and the anaerobic layer and the aerobic layer are gradually lifted along the liquid flowing direction; the top of one side of the aeration treatment tank 3 is a liquid inlet, the top of the other side is provided with a liquid outlet, the bottom of the aeration treatment tank 3 is provided with a plurality of air supply nozzles 301, the air supply nozzles 301 are connected with an air supply pump through pipelines, a plurality of partition plates 302 which are arranged in parallel are arranged in the aeration treatment tank 3, and the partition plates 302 are provided with honeycomb hole structures; the acid-base adjusting tank 4 is connected with an adjusting chemical box through a chemical supply pipe, a flow valve is arranged on the chemical supply pipe, an acid-base detector is arranged in the acid-base adjusting tank 4, and a stirring paddle 401 is also arranged in the acid-base adjusting tank 4; the top of one side of the algae cultivation pool 5 is a liquid inlet, the top of the other side of the algae cultivation pool is provided with a liquid outlet, the liquid outlet is higher than the position of the liquid inlet, a culture medium 501 is laid at the bottom of the algae cultivation pool 5, a covering layer 502 is arranged on the top surface of the culture medium 501, an algae cutting assembly is arranged at the upper part of an inner cavity of the algae cultivation pool 5, the algae cutting assembly comprises a pair of cutting net racks 504 with reverse strokes, each cutting net rack 504 is connected by a driving machine, and the grid edges of the cutting net; the top of 6 one sides in pond is cultivateed to the animal is the inlet, and the opposite side bottom sets up drain 601, and animal cultivation pond 6 is through oxygen supply pipe connection pump oxygen machine, and animal cultivation pond 6 is through trading water piping connection and trading the water pump, and the top in pond 6 is cultivateed to the animal sets up sunshade 602, and sunshade 602 has expansion bracket and collapsible top facing.

In the biogas slurry ecological treatment breeding system, the solid-liquid separation tank 1, the decomposition treatment tank 2, the aeration treatment tank 3, the acid-base regulation tank 4, the algae culture tank 5 and the animal culture tank 6 can be arranged in a line in sequence, or arranged in multiple lines according to an operation site, and the process sequence of liquid flow is ensured to be correct by structures such as pipelines.

The solid-liquid separation tank 1 mainly utilizes the sedimentation characteristic to settle turbid impurities in the biogas slurry, and sends a relatively clear liquid flow to the next process tank, and the multistage step 101 and the mesh-shaped step surface thereof block overlarge impurities from floating at the liquid outlet in the sedimentation process so as to prevent the impurities from entering the next process tank.

The anaerobic layer and the aerobic layer in the decomposition treatment tank 2 form an inclined slope from thin to thick from the liquid inlet end to the liquid outlet end, so that the liquid flow speed is reduced, the contact time and the contact area of liquid flow and the biological membrane 202 are further increased, and the reaction effect is enhanced.

A plurality of partition plates 302 are additionally arranged in the aeration treatment tank 3, and the circulation of space is formed through honeycomb holes on the partition plates 302, so that the turbulence degree of inflow liquid is increased, and the overflowing speed of oxygen passing through the liquid is slowed down, thereby enhancing the combination action time and the combination degree of gas and liquid.

The pH value of the biogas slurry is adjusted in the pH adjusting tank 4, and the adjustment of specific nutrient components refers to the supplement adjustment of the concentration, the pH value and nutrient salt components of the biogas slurry.

The algae cutting assembly in the algae culture pond 5 is of a bilateral symmetry structure, and specifically comprises a left driving machine connected with a cutting net rack 504, a right driving machine connected with the cutting net rack 504, and grid square holes with the same specification are formed in the cutting net rack 504, and under a normal state, algae grows upwards to pass through the grid square holes, and when the algae needs to be cut, the driving machines respectively pull the cutting net rack 504 leftwards or rightwards, so that the grid square holes of the two cutting net racks 504 are staggered, and then the top end parts of the algae are cut through the twisting and cutting action of the blades on two sides.

The animal culture pond 6 can be divided into a plurality of isolated culture areas, and each isolated culture area can be used for feeding aquatic products of the same kind, so that different species can be separated to avoid factors such as mutual casualties and the like. The foldable cover of the sunshade 602 can be configured to be opaque or translucent and can be shielded or unshielded depending on weather conditions, aquatic characteristics.

The top of the decomposition treatment pool 2 is provided with a methane collection cover 201, the methane collection cover 201 is communicated with the middle part of the algae culture pool 5 through an air pipeline, and a deodorization filter and a methane absorber are connected on the air pipeline in series. The main component of the methane subjected to deodorization and methane removal is carbon dioxide, and gas containing a large amount of carbon dioxide is introduced into the algae culture pond 5 to contribute to efficient propagation and growth of algae.

The inside of the decomposition treatment pool 2 is provided with a U-shaped through cavity, one side port of the U-shaped through cavity is connected with the liquid inlet of the decomposition treatment pool 2, and the other side port of the U-shaped through cavity is connected with the liquid outlet of the decomposition treatment pool 2. Biomembrane 202 is located the bottom that the U type leads to the chamber, and the liquid stream that gets into decomposition treatment pond 2 need lead to the chamber through the U type from the inlet and just can reach the liquid outlet, must carry out aerobic treatment through biomembrane 202 from this, and then effectively ensure the contact reaction of natural pond liquid and biomembrane 202, improves aerobic treatment effect, and the concentration of nutrients such as the turbidity of better adjustment natural pond liquid and nitrogen, phosphorus to adapt to follow-up algae growth.

The thickness of the culture medium 501 is 30 cm-60 cm; the covering layer 502 is provided with a plurality of ceramic particles, the diameter of each ceramic particle is 10-30 mm, a plurality of holes are formed in the ceramic particles, and the thickness of the covering layer 502 is 6-15 cm. The porous characteristic of the ceramic particles can be utilized to carry and store more oxygen in water, and meanwhile, nutrients in the water can be attached, so that beneficial growth assistance to the algae is provided.

A water level measurer is arranged in the algae culture pond 5, a lifting dam 503 is arranged at the liquid outlet of the algae culture pond 5, a filter screen is arranged at the top of the lifting dam 503, and the diameter of a mesh of the filter screen is 10 cm-15 cm. The actual water level height is measured by the water level measurer, and then the lifting height of the lifting dam 503 is operated according to the measured value, so that the water flow can enter the next process pool at a certain speed and quantity, and meanwhile, the operation effect of instantaneous water supplement or instantaneous closure can be performed on the next process pool. The oversize algae leaves are retained in the algae culture pond 5 through the filter screen, so that the water quality is prevented from being polluted due to the fact that the oversize algae leaves cannot be eaten by the raised animals.

1) firstly, untreated biogas slurry enters a solid-liquid separation tank 1 through a liquid inlet, the flow rate of the biogas slurry is not more than 50m/h, the biogas slurry is gradually accumulated and ascends in the solid-liquid separation tank 1, meanwhile, a proper amount of disinfectant is added into the solid-liquid separation tank 1 by using a disinfector, turbid impurities in the biogas slurry sink to the bottom of the tank, relatively clear liquid is positioned at the upper part until the solid-liquid separation tank 1 is full, the clear liquid slowly flows out from the liquid outlet, a valve on a slag discharge pipe 102 is opened at intervals, and the impurities deposited at the bottom of the tank are discharged;

2) the settled biogas slurry sequentially enters a decomposition treatment tank 2, the flow rate of the biogas slurry does not exceed 40m/h, the biogas slurry and an anaerobic layer and an aerobic layer of a biological membrane 202 at the bottom of the tank respectively perform anaerobic and aerobic actions, organic matters in the biogas slurry are decomposed and metabolized through anaerobic reaction to promote formation of biogas, and the organic matters in the biogas slurry are subjected to oxidative decomposition through aerobic reaction;

3) further precipitating impurities in the decomposed biogas slurry in the decomposition treatment tank 2, then sequentially introducing clarified liquid into the aeration treatment tank 3, starting the air supply pump, adding a large amount of air into the biogas slurry through the plurality of air supply nozzles 301, and enhancing the turbulence degree, contact area and time of the gas and the liquid due to the structural blocking of the plurality of partition plates 302 so as to dissolve more air in the biogas slurry;

4) further precipitating impurities in the aerated biogas slurry in an aeration treatment tank 3, then sequentially introducing clarified liquid into an acid-base regulation tank 4, monitoring the pH value of the biogas slurry according to a pH value detector, controlling the opening of a flow valve according to a required pH value standard, injecting a proper amount of medicament into the biogas slurry by regulating a medicament box, simultaneously starting a stirring paddle 401 to stir so that the concentration of the biogas slurry is consistent, and regulating the concentration, the pH value and nutritional ingredients of the biogas slurry in the pH value regulation tank 4;

5) further precipitating impurities in the adjusted biogas slurry in an acid-base adjusting tank 4, then sequentially feeding clarified liquid into an algae culture tank 5, planting the roots of algae growing in the algae culture tank 5 into a culture medium 501, fixing the algae through an upper covering layer 502, fixing carbon dioxide in the biogas by the algae under photosynthesis, growing and propagating by using inorganic salts such as inorganic nitrogen, phosphorus and the like in the biogas slurry as nutrient sources, and simultaneously realizing water body purification of the biogas slurry; the tops of the algae are periodically cut by using the algae cutting assembly, and the cut algae leaves enter the next process pool along with the purified water body to be used as feed;

6) purifying and finally precipitating the biogas slurry in an algae culture pond 5, then sequentially introducing clarified liquid into an animal culture pond 6, starting a water exchange pump, pumping water into the animal culture pond 6 through a water exchange pipe, supplementing required water, properly diluting the concentration of the biogas slurry, simultaneously starting an oxygen pump to provide oxygen into the animal culture pond 6 through an oxygen supply pipe, adopting algae leaves as main feed in the animal culture pond 6, matching with proper auxiliary feed, and periodically starting a sewage discharge outlet 601 to discharge residues and excrement impurities deposited at the bottom of the pond;

7) the deposited impurities at the bottom of the solid-liquid separation tank 1 are periodically discharged to an experimental cultivated land and are used as poultry feed or fertilizer of crops to promote the growth of the poultry feed or the crops; the poultry obtains food sources through the algae in the algae culture pond 5 and/or the aquatic products in the animal culture pond 6 and/or the poultry feed in the experimental cultivated land; excrement produced by the poultry raised in the poultry house falls into the drainage pipe through the grid floor and further enters the solid-liquid separation tank 1 to be used as a raw material of biogas slurry.

In the step 1), the disinfectant is a sodium hypochlorite solution with the concentration of 8-10%, the addition amount of the disinfectant is 1-3 mL/L, sodium thiosulfate with the same concentration is used for neutralization, and the mass fraction% of effective chlorine in the sodium hypochlorite solution is more than or equal to 10.0.

In the step 2), biogas generated by metabolizing the biogas slurry in the decomposition treatment tank 2 is collected, then methane components in the biogas are absorbed and odor is removed, and the biogas is conveyed to the algae culture tank 5 through a pipeline, so that residual carbon dioxide gas in the biogas contributes to the propagation and growth of algae.

In the step 3), adding quicklime with the water volume of 0.3-0.5 per mill in the aeration process, continuously aerating for 24 hours, then continuously aerating for 24 hours at intervals of 3 hours, and precipitating for 2 hours.

In the step 6), the animal culture pond 6 is divided into a plurality of independent isolated culture areas to respectively culture the fairy shrimp, the tubificidae, the snails and the ornamental fish.

The biogas slurry ecological treatment culture system and the operation method thereof utilize high-content nitrogen and phosphorus inorganic salt in the biogas slurry, so that the biogas slurry is treated to be used as nutrition of algae to provide energy, and simultaneously, carbon dioxide in the biogas is used as algae culture raw material, thereby not only solving the problem of the cost of algae culture, but also purifying and utilizing the biogas and the biogas slurry, reducing the environmental pollution of the biogas slurry, further carrying out animal breeding through algae propagation, optimizing the water quality of animal breeding, improving the environment and increasing the economic, social and ecological benefits; in addition, the biogas slurry is subjected to primary treatment, then is used for providing nutrients for algae cultivation, further algae is used as feed for animal feeding, biogas slurry residues are used as farmland fertilizer, the poultry are fed by the algae, aquatic products and the feed, and excrement of the poultry is used as raw materials of the biogas slurry to form recyclable ecological cultivation.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the solid-liquid separation tank 1 is used more herein; a multistage step 101; a slag discharge pipe 102; a decomposition treatment tank 2; a biogas collection cover 201; a biofilm 202; an aeration treatment tank 3; an air supply shower 301; a partition 302; an acid-base adjusting tank 4; a stirring paddle 401; an algae culture pond 5; a culture medium 501; a cover layer 502; a lifting dam 503; cutting the wire frame 504; an animal culture pond 6; a sewage drain 601; sun shade 602, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The biogas slurry ecological treatment culture system comprises a solid-liquid separation tank, a decomposition treatment tank, an aeration treatment tank, an acid-base regulation tank, an algae culture tank and an animal culture tank which are arranged according to a treatment process sequence, wherein the solid-liquid separation tank, the decomposition treatment tank, the aeration treatment tank, the acid-base regulation tank, the algae culture tank and the animal culture tank are sequentially connected in series end to end through connectors; a poultry house is arranged above the solid-liquid separation tank, poultry is cultured in the poultry house, a grid floor is arranged at the bottom of the poultry house, and the lower part of the grid floor is connected with the solid-liquid separation tank through a drainage pipe; the solid-liquid separation tank is provided with a liquid inlet end and a liquid outlet end, a liquid inlet is formed in the bottom of the liquid inlet end, a multistage step which is gradually raised is arranged on the inner side of the liquid outlet end, a liquid outlet is formed in the top of the liquid outlet end, the multistage step is provided with a net-shaped step surface, a slag discharge pipe is arranged at the bottom of the liquid outlet end, a valve is arranged on the slag discharge pipe, the slag discharge pipe is connected with an experimental farmland, the experimental farmland is used for planting poultry feed or crops, and the solid-liquid separation tank is connected with a sterilizer through a pipeline; the top of one side of the decomposition treatment tank is provided with a liquid inlet, the top of the other side of the decomposition treatment tank is provided with a liquid outlet, the liquid outlet is higher than the liquid inlet, a biological membrane is arranged in the decomposition treatment tank and sequentially comprises a filter material layer, an anaerobic layer and an aerobic layer from bottom to top, an attachment liquid layer is formed on the upper surface of the aerobic layer, a flowing liquid layer is formed on the upper surface of the attachment liquid layer, and the anaerobic layer and the aerobic layer are gradually raised along the liquid flowing direction; the top of one side of the aeration treatment tank is provided with a liquid inlet, the top of the other side of the aeration treatment tank is provided with a liquid outlet, the bottom of the aeration treatment tank is provided with a plurality of air supply nozzles, the air supply nozzles are connected with an air supply pump through pipelines, a plurality of partition plates which are arranged in parallel are arranged in the aeration treatment tank, and the partition plates are provided with honeycomb hole structures; the acid-base adjusting tank is connected with an adjusting agent box through a medicine supply pipe, a flow valve is arranged on the medicine supply pipe, an acid-base detector is arranged in the acid-base adjusting tank, and a stirring paddle is further arranged in the acid-base adjusting tank; the top of one side of the algae culture pond is a liquid inlet, the top of the other side of the algae culture pond is provided with a liquid outlet, the liquid outlet is higher than the position of the liquid inlet, a culture medium is laid at the bottom of the algae culture pond, a covering layer is arranged on the top surface of the culture medium, an algae cutting assembly is arranged at the upper part of an inner cavity of the algae culture pond and comprises a pair of cutting net racks with reverse strokes, each cutting net rack is connected by a driving machine, the algae cutting assemblies in the algae culture pond are in a bilateral symmetry structure, the left driving machine is connected with one cutting net rack, the driving machine on the right side is connected with one cutting net rack, grid square holes with equal specifications are arranged on the cutting net racks; the device comprises an animal culture pond, a decomposition treatment pond, a deodorization filter, a methane absorber, a U-shaped through cavity, a sewage outlet, an oxygen pump, an oxygen exchange pipe, a water exchange pump, a water exchange pipe, a sunshade cover, a biogas collection cover, a deodorization filter, a methane absorber, a decomposition treatment pond and a sewage treatment pond, wherein the top of one side of the animal culture pond is a liquid inlet, the bottom of the other side of the animal culture pond is provided with a sewage outlet, the animal culture pond is connected with the oxygen pump through the oxygen supply pipe, the water exchange pump is connected with the animal culture pond through the water exchange pipe, the sunshade cover is arranged above the animal culture pond and provided with a telescopic frame and a foldable cover surface, the top of the; the method is characterized by comprising the following steps:

4) further precipitating impurities in the aerated biogas slurry in an aeration treatment tank, sequentially introducing clarified liquid into an acid-base regulation tank, monitoring the pH value of the biogas slurry according to a pH value detector, controlling the opening of a flow valve according to a required pH value standard, injecting a proper amount of medicament into the biogas slurry by regulating a medicament box, starting a stirring paddle to stir so that the concentration of the biogas slurry is consistent, and regulating the concentration, the pH value and the nutrient content of the biogas slurry in the acid-base regulation tank;

5) further precipitating impurities in the adjusted biogas slurry in an acid-base adjusting tank, then sequentially feeding clarified liquid into an algae culture tank, planting the roots of algae growing in the algae culture tank into a culture medium, fixing the algae through an upper covering layer, fixing carbon dioxide in the biogas by the algae under the photosynthesis, growing and propagating by using inorganic nitrogen and phosphorus inorganic salts in the biogas slurry as nutrient sources, and simultaneously realizing water body purification of the biogas slurry; the algae cutting assembly is used for regularly cutting the tops of algae, the algae grow upwards to penetrate through the grid square holes in a normal state, when the algae need to be cut, the driving machine respectively pulls the cutting net racks leftwards or rightwards to enable the grid square holes of the two cutting net racks to be staggered, the top parts of the algae are cut off through the twisting and cutting action of the cutting edges on the two sides, and the cut algae leaves enter the next process pool along with the purified water body to serve as feed;

7) the deposited impurities at the bottom of the solid-liquid separation tank are periodically discharged to an experimental cultivated land and are used as poultry feed or fertilizer for crops to promote the growth of the poultry feed or the fertilizer; the poultry obtains food source through algae in the algae culture pond and/or aquatic products in the animal culture pond and/or poultry feed in experimental cultivated land; the excrement produced by the poultry raised in the poultry house falls into the excrement pipe through the grid floor and then enters the solid-liquid separation tank, as a raw material of biogas slurry; in the step 1), the disinfectant is a sodium hypochlorite solution with the concentration of 8-10%, the addition amount is 1-3 mL/L, then the sodium thiosulfate with the same concentration is used for neutralization, the mass fraction of the available chlorine in the sodium hypochlorite solution is more than or equal to 10.0 percent; in the step 2), collecting the biogas generated by the metabolism of the biogas slurry in the decomposition treatment pool, then absorbing methane component in the methane and removing odor, then conveying to an algae culture pond through a pipeline, so that the residual carbon dioxide gas in the biogas can help the algae to breed and grow; in the step 3), adding quicklime with the water volume of 0.3-0.5 per mill in the aeration process, continuously aerating for 24 hours, then continuously aerating for 24 hours at intervals of 3 hours, and precipitating for 2 hours.

2. The operation method of the biogas slurry ecological treatment cultivation system according to claim 1, wherein in the step 6), the animal cultivation pond is divided into a plurality of independent isolated cultivation areas to respectively cultivate fairy shrimp, tubificidae, snails and ornamental fish.