Organic sewage treatment system and method for livestock farm

Abstract

The invention provides an organic sewage treatment system and method for a livestock farm, and belongs to the technical field of livestock farm sewage treatment.The organic sewage treatment system comprises a sewage treatment assembly, a heat storage assembly and a solar heat collection assembly.The sewage treatment assembly comprises a three-stage sedimentation tank, and the three-stage sedimentation tank is connected with a fermentation tank through a siphon; the fermentation tank is further connected with a purification assembly through a connecting pipe, the other end of the purification assembly is connected with an exhaust fan, the other end of the exhaust fan is connected with a steam turbine, the steam turbine is further connected with a first heat exchanger, and the first heat exchanger is connected with a heat storage assembly. According to the organic sewage treatment system and method for the livestock farm, through efficient physical and biological treatment methods, harmful substances in breeding wastewater are effectively removed, a natural water body is protected against pollution, meanwhile, resource recycling (heat energy recovery and waste conversion) is achieved, the operation cost is reduced, the breeding quality is improved, and the ecological environment is protected. The sustainable development of the breeding industry is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of farm sewage treatment, and in particular to an organic sewage treatment system and method for farms. Background Art

[0002] In recent years, with the continuous expansion of the global livestock industry, the problem of wastewater treatment in farms has become increasingly prominent. Aquaculture wastewater, as a high-concentration organic wastewater, contains a large amount of organic matter, nitrogen, phosphorus and other nutrients as well as pathogenic microorganisms. If it is directly discharged into the natural environment without effective treatment, it will not only cause serious eutrophication pollution to the water body and destroy the aquatic ecosystem, but may also spread diseases through the food chain, posing a potential threat to human health.

[0003] Existing farm sewage treatment technology, such as the utility model patent with application number 201821866159.1, discloses a livestock and poultry farm sewage treatment system, including livestock and poultry breeding pens, farm sewage collection tanks, first sewage booster pumps, solid-liquid separators, hydrolysis acidification tanks, second sewage booster pumps, several groups of fermentation barrels and Roots blowers; the drainage ditch of the livestock and poultry breeding pens is connected to the farm sewage collection tank; the farm sewage collection tank is connected to the water inlet of the first sewage booster pump, the water outlet of the first sewage booster pump is connected to the solid-liquid separator, the liquid outlet of the solid-liquid separator is connected to the hydrolysis acidification tank, and the hydrolysis acidification tank is connected to the water inlet of the second sewage booster pump; the water outlet of the second sewage booster pump is respectively connected to the first-stage fermentation barrel in each group of fermentation barrels; each group of fermentation barrels also includes several levels of fermentation barrels, and the lower parts of the multi-stage fermentation barrels in each group are connected through pipes; the Roots blower is connected to the top of all fermentation barrels through pipes. Solve the sewage discharge problem of livestock and poultry farms.

[0004] The utility model patent with application number 201920897481.9 discloses a farm sewage treatment system, including three sedimentation tanks, wherein the three sedimentation tanks are provided with a P1 pump, wherein the P1 pump is connected to an anaerobic biochemical enhancer through a pipeline, wherein the anaerobic biochemical enhancer is connected to an aerobic reactor through a pipeline, wherein the aerobic reactor is connected to a secondary sedimentation tank through a pipeline, wherein the secondary sedimentation tank is connected to an intermediate water tank 1, wherein a P2 pump is provided in the intermediate water tank 1. The farm sewage treatment system can effectively remove high-concentration COD, BOD5, SS, NH3-N, total phosphorus, etc. At the same time, the utility model has the advantages of stable and reliable technical performance, high fully automated control system, thorough treatment effect, small footprint, convenient maintenance, and high sewage recycling rate.

[0005] In the above patents, although the farm wastewater was treated and fermented using different methods such as physical and biological methods, we know that a large amount of heat will be generated during the fermentation process, and this heat has not been effectively utilized in the current farm wastewater treatment system. Summary of the invention

[0006] The purpose of the present invention is to provide an organic sewage treatment system and method for a farm. The system utilizes equipment such as a steam turbine and a heat exchanger to recover the heat energy in the wastewater, and stores it through a heat storage component, thereby providing clean energy for heating and cooling of the farm. This heat recovery technology not only reduces energy consumption, but also reduces greenhouse gas emissions; the organic materials in the fermentation tank can be converted into fertilizers or feed additives after treatment, thereby realizing the resource utilization of waste. This not only reduces the waste discharge of the farm, but also reduces the dependence on external resources; by recovering heat energy and converting waste materials, the heat generated is stored in the heat storage component, and a portion of the heat is stored again through the heat storage component, thereby realizing cooling and heating of the farm throughout the year, thereby realizing efficient energy utilization while treating sewage.

[0007] To achieve the above-mentioned object, the present invention provides an organic sewage treatment system for a farm, comprising a sewage treatment component, a heat storage component and a solar heat collection component, wherein the sewage treatment component comprises a three-stage sedimentation tank, wherein the three-stage sedimentation tank is connected to a fermentation tank via a siphon, wherein the fermentation tank is further connected to a purification component via a connecting pipe, wherein the other end of the purification component is connected to an exhaust fan, wherein the other end of the exhaust fan is connected to a steam turbine, wherein the steam turbine is further connected to a heat exchanger 1, wherein the heat exchanger 1 is connected to the heat storage component; The purification assembly includes purification box 1 and purification box 2; The solar heat collection assembly includes a trough collector, the trough collector is connected to a heat transfer oil pump, the other end of the heat transfer oil pump is connected to a second heat exchanger, and the second heat exchanger is connected to a heat storage assembly; The thermal storage assembly consists of an array of vertical buried pipes arranged in the soil.

[0008] Preferably, three activated carbon layers are arranged in the purification box 1, and a microbial deodorant is arranged in the purification box 2, wherein the microbial deodorant is Pseudomonas putida and Salinosporum nitrifyingum.

[0009] Preferably, there are three fermentation tanks, namely fermentation tank one, fermentation tank two and fermentation tank three.

[0010] Preferably, the fermentation tank one, the fermentation tank two and the fermentation tank three are also connected to a waste recovery box through a hard pipe, and the waste recovery box is used to store feed residues in the farm.

[0011] Preferably, one end of the connecting pipe connected to the fermentation tank is provided with a three-way joint, and the other end of the three-way joint is connected to the purification box 1 through a hose.

[0012] Preferably, the heat storage component is also connected to a high-temperature ground-source heat pump unit, the high-temperature ground-source heat pump unit is also connected to a heating circulation pump, and the heating circulation pump is also connected to a heating system inside the farm.

[0013] Preferably, the steam turbine is also connected to a steam extraction pipeline, the other end of the steam extraction pipeline is connected to a lithium bromide unit, the lithium bromide unit is also connected to a refrigeration circulation pump, and the refrigeration circulation pump is also connected to a refrigeration system inside the farm.

[0014] Preferably, each of the fermentation tanks 1, 2 and 3 is provided with a stirring assembly, and the stirring assembly includes a stirring shaft, and the stirring shaft is provided with stirring blades, and the stirring shaft is connected to a stirring motor.

[0015] Based on the above-mentioned organic wastewater treatment system for farms, the present invention also provides a method for treating organic wastewater for farms, comprising the following steps: Step S1, introducing the sewage from the farm into the tertiary sedimentation tank through a pipeline for physical sedimentation; Step S2, then the sediment in the tertiary sedimentation tank is sucked into the fermentation tank one through a siphon, and the fermentation tank two and the fermentation tank three are used as standby fermentation tanks. When the fermentation tank starts to ferment but the fermentation is not completed, the standby fermentation tank is activated and the process is circulated in sequence; Step S3, introducing the feed residue in the waste recovery box into the fermentation tank 1; Step S4, fermentation; Step S5: After fermentation is completed, the exhaust fan is turned on to extract heat from the fermentation tank. The hot gas passes through the purification component to remove odor, and then passes through the turbine and heat exchanger 1 in sequence, and finally enters the heat storage component for heat storage; Step S6: While the sewage is being treated, the trough collector of the solar thermal collection assembly absorbs solar energy and stores the heat in the thermal storage assembly through the thermal oil pump and the heat exchanger 2; Step S7: energy utilization; Step S71: When the farm needs heating, the stored heat is transported to the heating mechanism of the farm through the high-temperature ground source heat pump unit and the heating circulating water pump; Step S72: When the farm needs cooling, steam is extracted from the steam turbine through the steam extraction pipeline to drive the lithium bromide unit for refrigeration, and finally transported to the refrigeration mechanism of the farm through the refrigeration circulation pump.

[0016] Preferably, in step S4, 0.1% of a composting agent is added to the fermentation tank one.

[0017] Therefore, the present invention adopts the above-mentioned organic wastewater treatment system and method for farms, and the beneficial technical effects are as follows: (1) Highly efficient water purification capability; Multi-stage sedimentation tank: Through the setting of three-stage sedimentation tank, the initial physical treatment of aquaculture wastewater is achieved, large suspended particles are effectively removed, and the load for subsequent biological treatment is reduced; Fermentation tank and purification components: The organic matter in the fermentation tank is hydrolyzed and fermented under anaerobic conditions, converting large molecular organic matter into small molecules, improving the biodegradability of the wastewater. The activated carbon layer and microbial deodorizer in the purification component further remove odors and harmful substances in the wastewater.

[0018] (2) Resource recycling; Heat recovery: The system uses steam turbines, heat exchangers and other equipment to recover the heat energy in wastewater and stores it through heat storage components, providing clean energy for heating and cooling of the farm. This heat recovery technology not only reduces energy consumption, but also reduces greenhouse gas emissions; Waste conversion: After being processed, the organic materials in the fermentation tank can be converted into fertilizer or feed additives, realizing the resource utilization of waste. This not only reduces the waste discharge of the farm, but also reduces the dependence on external resources; Thermal energy storage: The heat generated by heat recovery and waste conversion is stored in the thermal storage component, and part of the heat is stored in the thermal storage component, which can realize cooling and heating for the farm throughout the year, realizing efficient use of energy while treating sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an organic sewage treatment system for a breeding farm according to the present invention; Figure 2 This is a schematic diagram of a stirring component of an organic sewage treatment system for a farm according to the present invention; Figure 3 The present invention is a flow chart of a method for treating organic wastewater used in a breeding farm.

[0020] Reference numerals 1. Tertiary sedimentation tank; 2. Fermentation tank; 3. Siphon; 4. Purification box one; 5. Purification box two; 6. Exhaust fan; 7. Steam turbine; 8. Heat exchanger one; 9. Heat storage component; 901. Buried pipe; 10. Waste recovery box; 11. Trough collector; 12. Thermal oil pump; 13. Heat exchanger two; 14. High-temperature ground source heat pump unit; 15. Heating circulation pump; 16. Lithium bromide unit; 17. Refrigeration circulation pump; 18. Farm; 19. Stirring motor; 20. Stirring shaft; 21. Stirring blades. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0022] It should be noted that the terms "include", "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or devices.

[0023] Like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1 like Figure 1-Figure 2 As shown, an organic sewage treatment system for a farm of the present invention comprises a sewage treatment component, a heat storage component and a solar heat collection component.

[0027] The sewage treatment component comprises a tertiary sedimentation tank 1, which is connected to a fermentation tank 2 via a siphon 3, and the fermentation tank 2 is also connected to a purification component via a connecting pipe.

[0028] One end of the connecting pipe connected to the fermentation tank 2 is provided with a three-way joint, and the other end of the three-way joint is connected to the purification box 4 through a hose.

[0029] The tertiary sedimentation tank 1 can naturally settle large suspended particles and other impurities in the sewage to the bottom of the tank under the action of gravity to form a dirt layer. The siphon 3 sucks the dirt layer and part of the supernatant into the fermentation tank 2 for fermentation.

[0030] The fermentation tank 2 includes a fermentation tank 1, a fermentation tank 2 and a fermentation tank 3, and a stirring assembly is provided in each of the three fermentation tanks. The stirring assembly includes a stirring shaft 20, and a stirring blade 21 is provided on the stirring shaft 20. The stirring shaft 20 is connected to the stirring motor 19. A plurality of stirring assemblies can be provided, depending on the actual situation of the fermentation tank 2.

[0031] Fermentation tank 1, fermentation tank 2 and fermentation tank 3 are also connected to a waste recovery box 10 through a hard pipe. The waste recovery box 10 is used to store feed residues in the farm. Before the feed residues enter the waste recovery box 10, if the volume is too large, they need to be crushed, and the length of the feed entering the waste recovery box 10 is controlled to be less than 2 cm, which is convenient for subsequent fermentation processing.

[0032] A solenoid valve is provided at the connection between the fermentation tank 2 and the siphon pipe 3, and a solenoid valve is also provided at the connection between the fermentation tank and the hard pipe.

[0033] The purification assembly includes a purification box 1 4 and a purification box 2 5 .

[0034] The purification box 1 4 is provided with three layers of activated carbon, and the purification box 2 5 is provided with a microbial deodorant, which is Pseudomonas putida and Nitrosomonas.

[0035] By providing purification box 1 4 and purification box 2 5, the odor contained in the heat is removed.

[0036] The other end of the purification component is connected to an exhaust fan 6, and the other end of the exhaust fan 6 is connected to a steam turbine 7. The steam turbine 7 is also connected to a heat exchanger 8, and the heat exchanger 8 is connected to a heat storage component 9.

[0037] The solar heat collection component includes a trough collector 11 , which is connected to a heat transfer oil pump 12 , and the other end of the heat transfer oil pump 12 is connected to a second heat exchanger 13 , which is connected to a heat storage component 9 .

[0038] The heat storage assembly 9 is composed of an array of vertical buried pipes 901 arranged in the soil.

[0039] The heat storage component 9 is also connected to a high-temperature ground source heat pump unit 14 , and the high-temperature ground source heat pump unit 14 is also connected to a heating circulation pump 15 , and the heating circulation pump 15 is also connected to a heating system inside the breeding farm 18 .

[0040] When the farm 18 needs heating, the high-temperature ground source pump unit 14 and the heating circulation pump 15 are started to provide heating service.

[0041] The steam turbine 7 is also connected to a steam extraction pipeline, the other end of which is connected to a lithium bromide unit 16 , and the lithium bromide unit 16 is also connected to a refrigeration circulation pump 17 , which is also connected to a refrigeration system inside a breeding farm 18 .

[0042] When the farm 18 needs to be cooled, the lithium bromide unit 16 and the refrigeration circulation pump 17 are started to provide refrigeration service.

[0043] like Figure 3 As shown, based on the above-mentioned organic wastewater treatment system for farms, the present invention also provides a method for treating organic wastewater for farms, comprising the following steps: Step S1, introducing the sewage from the farm 18 into the tertiary sedimentation tank 1 through a pipeline for physical sedimentation; Step S2, then the sediment in the tertiary sedimentation tank 1 is sucked into the fermentation tank 1 through the siphon 3, and the fermentation tanks 2 and 3 are used as standby fermentation tanks. When the fermentation tank starts to ferment but the fermentation is not completed, the standby fermentation tank is activated and the process is circulated in sequence; Step S3, introducing the feed residue in the waste recovery box 10 into the fermentation tank 1; Step S4, fermentation; adding 0.1% of a composting agent into the fermentation tank 1 to promote the reproduction and activity of microorganisms, decompose organic matter into more stable substances, and generate a large amount of heat energy; the stirring assembly (including the stirring shaft 201, the stirring blade 21 and the stirring motor 19) provided in the fermentation tank will be operated regularly to ensure that the sediment and the feed are fully mixed and the fermentation efficiency is improved; Step S5, after fermentation is completed, the exhaust fan 6 is turned on to extract the heat in the fermentation tank, and the hot gas passes through the purification component to remove the odor. The purified hot air carries a large amount of heat energy, which is first converted by the turbine 7, and then transferred to the heat storage component 9 (vertical buried pipe array in the soil) through the heat exchanger 8 to achieve heat energy storage; Step S6: The energy generated by fermenting sewage and feed residues is limited, so a solar heat collection component is introduced while treating sewage. The trough collector 11 of the solar heat collection component absorbs solar energy and stores the heat in the heat storage component 9 through the heat transfer oil pump 12 and the heat exchanger 13; Step S7: energy utilization; Step S71: When the farm 18 needs heating, the stored heat is transported to the heating mechanism of the farm 18 through the high-temperature ground source heat pump unit 14 and the heating circulating water pump 15; Step S72: When the farm 18 needs cooling, steam is extracted from the steam turbine through the steam extraction pipeline to drive the lithium bromide unit 16 for refrigeration, and finally transported to the refrigeration mechanism of the farm 18 through the refrigeration circulation pump 17.

[0044] It is worth noting that the contents not elaborated in detail in the present invention are all prior art and are well known to those skilled in the art.

[0045] Therefore, the present invention adopts the above-mentioned organic sewage treatment system and method for farms. The system uses equipment such as steam turbines and heat exchangers to recover the heat energy in the wastewater, and stores it through heat storage components, providing clean energy for heating and cooling of the farm. This heat recovery technology not only reduces energy consumption, but also reduces greenhouse gas emissions; the organic materials in the fermentation tank can be converted into fertilizers or feed additives after treatment, realizing the resource utilization of waste. This not only reduces the waste discharge of the farm, but also reduces the dependence on external resources; the heat generated by heat recovery and waste conversion is stored in the heat storage component, and a part of the heat is stored again through the heat storage component, which can realize cooling and heating of the farm throughout the year, and realize efficient use of energy while treating sewage.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An organic wastewater treatment system for aquaculture farms, characterized in that: It includes a sewage treatment component, a heat storage component and a solar heat collection component, wherein the sewage treatment component includes a three-stage sedimentation tank, the three-stage sedimentation tank is connected to a fermentation tank through a siphon, the fermentation tank is also connected to a purification component through a connecting pipe, the other end of the purification component is connected to an exhaust fan, the other end of the exhaust fan is connected to a steam turbine, the steam turbine is also connected to a heat exchanger 1, and the heat exchanger 1 is connected to the heat storage component; The purification assembly includes purification box 1 and purification box 2; The solar heat collection assembly includes a trough collector, the trough collector is connected to a heat transfer oil pump, the other end of the heat transfer oil pump is connected to a second heat exchanger, and the second heat exchanger is connected to a heat storage assembly; The thermal storage assembly consists of an array of vertical buried pipes arranged in the soil.

2. The organic wastewater treatment system for aquaculture farms according to claim 1, characterized in that: The first purification box is provided with three layers of activated carbon, and the second purification box is provided with a microbial deodorant, wherein the microbial deodorant is Pseudomonas putida and Salinosporium nitrificum.

3. The organic wastewater treatment system for aquaculture farms according to claim 2, characterized in that: There are three fermentation tanks, namely fermentation tank one, fermentation tank two and fermentation tank three.

4. The organic wastewater treatment system for aquaculture farms according to claim 3, characterized in that: The fermentation tank one, the fermentation tank two and the fermentation tank three are also connected to a waste recovery box through a hard pipe, and the waste recovery box is used to store feed residues of the breeding farm.

5. The organic wastewater treatment system for aquaculture farms according to claim 4, characterized in that: One end of the connecting pipe connected to the fermentation tank is provided with a three-way joint, and the other end of the three-way joint is connected to the purification box one through a hose.

6. The organic wastewater treatment system for aquaculture farms according to claim 5, characterized in that: The heat storage component is also connected to a high-temperature ground source heat pump unit, and the high-temperature ground source heat pump unit is also connected to a heating circulation pump, and the heating circulation pump is also connected to the heating system inside the farm.

7. The organic wastewater treatment system for aquaculture farms according to claim 6, characterized in that: The steam turbine is also connected to a steam extraction pipeline, the other end of which is connected to a lithium bromide unit, the lithium bromide unit is also connected to a refrigeration circulation pump, and the refrigeration circulation pump is also connected to a refrigeration system inside the farm.

8. The organic wastewater treatment system for aquaculture farms according to claim 7, characterized in that: The fermentation tank one, the fermentation tank two and the fermentation tank three are all provided with stirring components, and the stirring components include a stirring shaft, and the stirring shaft is provided with stirring blades, and the stirring shaft is connected to a stirring motor.

9. A method for treating organic wastewater from a farm, characterized in that: The following steps are involved: Step S1, introducing the sewage from the farm into the tertiary sedimentation tank through a pipeline for physical sedimentation; Step S2, then the sediment in the tertiary sedimentation tank is sucked into the fermentation tank one through a siphon, and the fermentation tank two and the fermentation tank three are used as standby fermentation tanks. When the fermentation tank starts to ferment but the fermentation is not completed, the standby fermentation tank is activated and the process is circulated in sequence; Step S3, introducing the feed residue in the waste recovery box into the fermentation tank 1; Step S4, fermentation; Step S5: After fermentation is completed, the exhaust fan is turned on to extract heat from the fermentation tank. The hot gas passes through the purification component to remove odor, and then passes through the turbine and heat exchanger 1 in sequence, and finally enters the heat storage component for heat storage; Step S6: While the sewage is being treated, the trough collector of the solar thermal collection assembly absorbs solar energy and stores the heat in the thermal storage assembly through the thermal oil pump and the heat exchanger 2; Step S7: energy utilization; Step S71: When the farm needs heating, the stored heat is transported to the heating mechanism of the farm through the high-temperature ground source heat pump unit and the heating circulating water pump; Step S72: When the farm needs cooling, steam is extracted from the steam turbine through the steam extraction pipeline to drive the lithium bromide unit for refrigeration, and finally transported to the refrigeration mechanism of the farm through the refrigeration circulation pump.

10. The method for treating organic wastewater from a farm according to claim 9, characterized in that: In step S4, 0.1% of a composting agent is added to the fermentation tank one.

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