Organic sewage treatment system and method for farms

Abstract

The present invention provides a system and method for treating organic wastewater for aquaculture farms, belonging to the technical field of aquaculture farm wastewater treatment. The system comprises a wastewater treatment component, a heat storage component, and a solar thermal collection component. The wastewater treatment component comprises a three-stage sedimentation tank, the three-stage sedimentation tank being connected to a fermentation tank via a siphon tube. The fermentation tank is further connected to a purification component via a connecting pipe. The other end of the purification component is connected to an exhaust fan, and the other end of the exhaust fan is connected to a steam turbine. The steam turbine is further connected to a first heat exchanger, and the first heat exchanger is connected to the heat storage component. The present invention utilizes the above-mentioned system and method for treating organic wastewater for aquaculture farms. Through efficient physical and biological treatment methods, the system effectively removes harmful substances from aquaculture wastewater, protects natural water bodies from pollution, and simultaneously achieves resource recycling (heat recovery, waste conversion), reducing operating costs, improving aquaculture quality, and promoting the sustainable development of the aquaculture industry.

Description

Technical Field

[0001] The present invention relates to the technical field of farm wastewater treatment, and in particular to a farm organic wastewater treatment system and method. Background Art

[0002] In recent years, with the continuous expansion of the global livestock industry, the problem of farm wastewater treatment has become increasingly prominent. Aquaculture wastewater, as a highly concentrated organic wastewater, contains large amounts of organic matter, nutrients such as nitrogen and phosphorus, as well as pathogenic microorganisms. If discharged directly into the natural environment without effective treatment, it not only causes severe eutrophication and damages aquatic ecosystems, but also can spread diseases through the food chain, posing a potential threat to human health.

[0003] Existing farm wastewater treatment technologies, such as the utility model patent application number 201821866159.1, disclose a livestock and poultry farm wastewater treatment system, comprising livestock and poultry pens, a farm sewage collection tank, a first sewage booster pump, a solid-liquid separator, a hydrolysis and acidification tank, a second sewage booster pump, several groups of fermentation barrels, and a Roots blower. The drainage ditch of the livestock and poultry pens connects 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 and acidification tank, and the hydrolysis and acidification tank is connected to the water inlet of the second sewage booster pump. The water outlet of the second sewage booster pump is connected to the first-stage fermentation barrel in each group of fermentation barrels. Each group of fermentation barrels also includes several stages of fermentation barrels, and the bottoms of the multiple stages of fermentation barrels in each group are connected by pipes. The Roots blower is connected to the top of all fermentation barrels via pipes. This solves the wastewater discharge problem of livestock and poultry farms.

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

[0005] In the above patents, although the farm wastewater is treated and fermented using different methods such as physical and biological methods, we know that a large amount of heat is generated during the fermentation process, and this heat is not 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 wastewater treatment system and method for farms. The system utilizes equipment such as steam turbines and heat exchangers to recover the heat energy in the wastewater and stores it through a heat storage component, thereby providing clean energy for heating and cooling the farm. This heat recovery technology not only reduces energy consumption but also reduces greenhouse gas emissions. After treatment, the organic materials in the fermentation tank can be converted into fertilizer or feed additives, thus realizing the resource utilization of waste. This not only reduces waste emissions from the farm but also reduces dependence on external resources. By recovering heat energy and converting waste, the heat generated is stored in the heat storage component, and a portion of the heat is further stored through the heat storage component, which can achieve year-round cooling and heating for the farm, achieving efficient energy utilization while treating wastewater.

[0007] To achieve the above objectives, the present invention provides an organic wastewater treatment system for aquaculture farms, comprising a wastewater treatment component, a heat storage component, and a solar heat collection component. The wastewater treatment component comprises a three-stage sedimentation tank, which is connected to a fermentation tank via a siphon. The fermentation tank is further connected to a purification component via a connecting pipe. The other end of the purification component is connected to an exhaust fan, and the other end of the exhaust fan is connected to a steam turbine. The steam turbine is further connected to a first heat exchanger, and the first heat exchanger is connected to the heat storage component.

[0008] The purification assembly includes purification box 1 and purification box 2;

[0009] The solar heat collection assembly includes a trough heat collector, the trough heat 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;

[0010] The thermal storage assembly consists of an array of vertical buried pipes set in the soil.

[0011] Preferably, three layers of activated carbon are provided in the first purification box, and a microbial deodorant is provided in the second purification box, wherein the microbial deodorant is Pseudomonas putida and Nitrohalomonas.

[0012] Preferably, there are three fermentation tanks, namely fermentation tank one, fermentation tank two and fermentation tank three.

[0013] 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.

[0014] 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.

[0015] Preferably, the heat storage component is further connected to a high-temperature ground-source heat pump unit, the high-temperature ground-source heat pump unit is further connected to a heating circulation pump, and the heating circulation pump is further connected to the heating system inside the farm.

[0016] 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 the refrigeration system inside the farm.

[0017] 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.

[0018] 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:

[0019] Step S1: introducing the farm sewage into the tertiary sedimentation tank through a pipeline for physical sedimentation;

[0020] Step S2, then sucking the sediment in the tertiary sedimentation tank into the fermentation tank 1 through a siphon, and the fermentation tank 2 and the fermentation tank 3 serve as standby fermentation tanks. When the fermentation tank starts fermenting but the fermentation is not completed, the standby fermentation tank is activated, and the process is circulated in sequence;

[0021] Step S3, introducing the feed residue in the waste recovery box into the fermentation tank 1;

[0022] Step S4, fermentation;

[0023] 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, then passes through the turbine and heat exchanger 1 in sequence, and finally enters the heat storage component for heat storage;

[0024] 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 second heat exchanger;

[0025] Step S7: energy utilization;

[0026] Step S71: When the farm needs heating, the stored heat is transported to the farm's heating mechanism via the high-temperature ground-source heat pump unit and the heating circulating water pump;

[0027] 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 cooling, and finally transported to the refrigeration mechanism of the farm through the refrigeration circulation pump.

[0028] Preferably, in step S4, 0.1% composting agent is added to the fermentation tank 1.

[0029] Therefore, the present invention adopts the above-mentioned organic wastewater treatment system and method for farms, and the beneficial technical effects are as follows:

[0030] (1) High-efficiency water purification capability;

[0031] Multi-stage sedimentation tank: The three-stage sedimentation tank is used to achieve the initial physical treatment of aquaculture wastewater, effectively remove large suspended solids, and reduce the load for subsequent biological treatment;

[0032] Fermentation tank and purification component: Organic matter in the fermentation tank undergoes hydrolysis and fermentation under anaerobic conditions, converting large organic molecules into small molecules and improving the biodegradability of the wastewater. The activated carbon layer and microbial deodorizer in the purification component further remove odors and harmful substances from the wastewater.

[0033] (2) Resource recycling;

[0034] Heat recovery: The system uses steam turbines, heat exchangers and other equipment to recover heat from wastewater and stores it in thermal storage components, providing clean energy for heating and cooling in the farm. This heat recovery technology not only reduces energy consumption but also greenhouse gas emissions.

[0035] 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;

[0036] 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 energy utilization while treating sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of an organic wastewater treatment system for a farm according to the present invention;

[0038] Figure 2 This is a schematic diagram of a stirring component of an organic wastewater treatment system for a farm according to the present invention;

[0039] Figure 3 The present invention is a flow chart of a method for treating organic wastewater used in farms.

[0040] Reference numerals

[0041] 1. Tertiary sedimentation tank; 2. Fermentation tank; 3. Siphon; 4. Purification box 1; 5. Purification box 2; 6. Exhaust fan; 7. Steam turbine; 8. Heat exchanger 1; 9. Heat storage component; 901. Buried pipe; 10. Waste recovery box; 11. Trough collector; 12. Thermal oil pump; 13. Heat exchanger 2; 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 blade. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail with reference to 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 numbers throughout represent the same or similar elements or elements with the same or similar functions.

[0043] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0044] Like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0045] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product 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 orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0046] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] Example 1

[0048] like Figure 1-Figure 2 As shown, the organic wastewater treatment system for aquaculture farms of the present invention includes a wastewater treatment component, a heat storage component and a solar heat collection component.

[0049] The sewage treatment component includes a tertiary sedimentation tank 1, which is connected to a fermentation tank 2 via a siphon 3. The fermentation tank 2 is further connected to a purification component via a connecting pipe.

[0050] 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.

[0051] The tertiary sedimentation tank 1 allows large suspended solids and other impurities in the sewage to naturally settle to the bottom of the tank under the action of gravity, forming a sewage layer. The siphon 3 draws the sewage layer and part of the supernatant into the fermentation tank 2 for fermentation.

[0052] The fermentation tank 2 includes a fermentation tank 1, a fermentation tank 2, and a fermentation tank 3. Each of the three fermentation tanks is provided with a stirring assembly, which includes a stirring shaft 20, on which a stirring blade 21 is provided. The stirring shaft 20 is connected to a stirring motor 19. Multiple stirring assemblies can be provided, depending on the actual situation of the fermentation tank 2.

[0053] Fermentation tanks 1, 2, and 3 are also connected to a waste recovery bin 10 via rigid pipes. This bin is used to store feed residue from the farm. Before entering the bin, any large feed residue is crushed to keep it less than 2 cm in length, facilitating subsequent fermentation.

[0054] 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.

[0055] The purification assembly includes purification box 1 4 and purification box 2 5.

[0056] The first purification box 4 is provided with three layers of activated carbon, and the second purification box 5 is provided with a microbial deodorant, which is Pseudomonas putida and Nitrohalomonas.

[0057] By providing purification box 1 4 and purification box 2 5, the odor contained in the heat is removed.

[0058] The other end of the purification component is connected to the exhaust fan 6, and the other end of the exhaust fan 6 is connected to the steam turbine 7. The steam turbine 7 is also connected to the heat exchanger 8, and the heat exchanger 8 is connected to the heat storage component 9.

[0059] The solar heat collection assembly includes a trough collector 11 , which is connected to a heat transfer oil pump 12 . The other end of the heat transfer oil pump 12 is connected to a second heat exchanger 13 , which is connected to the heat storage assembly 9 .

[0060] The heat storage assembly 9 is composed of an array of vertical buried pipes 901 arranged in the soil.

[0061] 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 the heating system inside the farm 18 .

[0062] 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.

[0063] 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 , which is also connected to a refrigeration circulation pump 17 , which is also connected to a refrigeration system inside a farm 18 .

[0064] When the farm 18 needs to be cooled, the lithium bromide unit 16 and the refrigeration circulation pump 17 are started to provide cooling service.

[0065] 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:

[0066] Step S1: introducing the sewage from the farm 18 into the tertiary sedimentation tank 1 through a pipeline for physical sedimentation;

[0067] Step S2: The sediment in the tertiary sedimentation tank 1 is then sucked into the fermentation tank 1 through the siphon 3. The fermentation tanks 2 and 3 serve as standby fermentation tanks. When the fermentation tanks start fermenting but the fermentation is not completed, the standby fermentation tanks are activated and the process is circulated sequentially.

[0068] Step S3: introducing the feed residue in the waste recovery box 10 into the fermentation tank 1;

[0069] Step S4, fermentation; adding 0.1% composting agent to the fermentation tank 1 to promote the growth 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, thereby improving the fermentation efficiency;

[0070] Step S5: After fermentation is completed, the exhaust fan 6 is turned on to extract heat from the fermentation tank. The hot gas passes through the purification component to remove odor. The purified hot air carries a large amount of heat energy. This heat energy 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;

[0071] Step S6: The energy generated by fermenting sewage and feed residues is limited, so a solar thermal collection component is introduced while sewage treatment is being performed. The trough collector 11 of the solar thermal collection component absorbs solar energy and stores the heat in the thermal storage component 9 through the thermal oil pump 12 and the heat exchanger 13.

[0072] Step S7: energy utilization;

[0073] 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;

[0074] 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 cooling, and finally transported to the refrigeration mechanism of the farm 18 through the refrigeration circulation pump 17.

[0075] 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.

[0076] Therefore, the present invention adopts the above-mentioned organic wastewater 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 dependence on external resources; the heat generated by heat recovery and waste conversion is stored in the heat storage component, and a portion of the heat is stored again through the heat storage component, which can realize cooling and heating of the farm throughout the year, realizing efficient energy utilization while treating sewage.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. 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 solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for treating organic wastewater from aquaculture farms, characterized in that: The organic wastewater treatment system for farms includes the following steps: Step S1: introducing the farm sewage into the tertiary sedimentation tank through a pipeline for physical sedimentation; Step S2, then sucking the sediment in the tertiary sedimentation tank into the fermentation tank 1 through a siphon, and the fermentation tank 2 and the fermentation tank 3 serve as standby fermentation tanks. When the fermentation tank starts fermenting 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, 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 second heat exchanger; Step S7: energy utilization; Step S71: When the farm needs heating, the stored heat is transported to the farm's heating mechanism via 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 cooling, and finally transported to the cooling mechanism of the farm through the refrigeration circulation pump; The organic wastewater treatment system for aquaculture farms includes a wastewater treatment component, a heat storage component, and a solar heat collection component. The wastewater treatment component includes a three-stage sedimentation tank, which is connected to a fermentation tank via a siphon. The fermentation tank is further connected to a purification component via a connecting pipe. The other end of the purification component is connected to an exhaust fan, and the other end of the exhaust fan is connected to a steam turbine. The steam turbine is further connected to a first heat exchanger, and the first heat exchanger 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 heat collector, the trough heat 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 set in the soil; 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 Nitrohalomonas; There are three fermentation tanks, namely fermentation tank 1, fermentation tank 2 and fermentation tank 3; The fermentation tank 1, the fermentation tank 2 and the fermentation tank 3 are further connected to a waste recovery box through a hard pipe, and the waste recovery box is used to store feed residues from the farm; 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; 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; The steam turbine is also connected to a steam extraction pipeline, the other end of which is connected to a lithium bromide unit, and the lithium bromide unit is also connected to a refrigeration circulation pump, which is also connected to a refrigeration system inside the farm.

2. The method for treating organic wastewater from a farm according to claim 1, wherein: The first fermentation tank, the second fermentation tank and the third fermentation tank are each provided with a stirring assembly, and the stirring assembly includes a stirring shaft, and the stirring shaft is provided with a stirring blade, and the stirring shaft is connected to a stirring motor.

3. The method for treating organic wastewater from a farm according to claim 1, wherein: In step S4, 0.1% of a composting agent is added to the fermentation tank 1.

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