An organic wastewater treatment system

Abstract

The utility model belongs to sewage treatment technical field, specifically disclose a kind of organic wastewater treatment system, including the adjusting pool, air floatator, aerobic tank, membrane filter pool and clean water pool connected in turn;The organic wastewater treatment system further includes sludge pool, and the import end of the sludge pool is communicated with air floatator, aerobic tank and membrane filter pool respectively by pipeline, and the export end of the sludge pool is connected with sludge treatment device by pipeline.The utility model provides a kind of organic wastewater treatment system, by integrating air floatation separation, oxygen biological treatment and membrane filtration process, realize the efficient removal of suspended solids, grease, colloidal substance and organic pollutants in organic wastewater, to achieve the purpose of sewage purification and recycling, to meet the actual needs of food industry, feed industry and other industries to organic wastewater treatment.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an organic wastewater treatment system. Background Technology

[0002] With the continuous development of the national economy and the constant improvement of people's living standards, industries such as food and feed are expanding in scale, generating a large amount of high-concentration organic wastewater during the production process. This type of wastewater contains a large amount of suspended solids, grease, colloids, and organic pollutants. If it is not treated properly and discharged directly, it will not only seriously pollute water bodies, soil, and other ecological environments, but may also pose a potential threat to human health and ecological balance. Therefore, the effective treatment of organic wastewater has become one of the key issues for the sustainable development of these industries.

[0003] Currently, the main methods for treating organic wastewater include physical, chemical, and biological methods. Physical methods (such as sedimentation and filtration) can remove some suspended solids, but their effectiveness in removing dissolved organic matter and colloidal substances is limited. Chemical methods (such as coagulation and oxidation) can improve pollutant removal rates, but they suffer from high reagent consumption, high operating costs, and the potential for secondary pollution. Biological methods, which degrade organic matter through the metabolism of microorganisms, have advantages such as lower cost and environmental friendliness, and are currently the most widely used treatment method. However, existing biological treatment systems often suffer from low treatment efficiency, low automation, and weak resistance to shock loads, making it difficult to consistently meet the water quality requirements for recycling or discharge. Especially when dealing with organic wastewater with large fluctuations in water quality and quantity, the treatment effect is easily affected, failing to meet the industry's demand for efficient, stable, and automated treatment.

[0004] In summary, existing organic wastewater treatment systems suffer from low treatment efficiency, low automation, and weak resistance to shock loads. Utility Model Content

[0005] This invention provides an organic wastewater treatment system that can solve the problems of low treatment efficiency, low automation, and weak resistance to shock loads in existing organic wastewater treatment systems.

[0006] An organic wastewater treatment system includes an equalization tank, an air flotation unit, an aerobic tank, a membrane filtration tank, and a clear water tank connected in sequence, wherein a dosing device is connected to the air flotation unit via a pipeline. The organic wastewater treatment system also includes a sludge tank. The inlet of the sludge tank is connected to the air flotation machine, the aerobic tank and the membrane filtration tank through pipes. The outlet of the sludge tank is connected to a sludge treatment device through a pipe. The membrane filtration tank is equipped with several membrane filtration modules, and the membrane filtration tank is also equipped with a membrane self-cleaning device for cleaning the membrane filtration modules.

[0007] Furthermore, the outlet end of the equalization tank is connected to the air flotation machine via a pipeline; A sewage lift pump is installed on the pipeline between the equalization tank and the air flotation machine.

[0008] Furthermore, the organic wastewater treatment system also includes a dissolved air tank and a dissolved air pump. The inlet end of the dissolved air pump is connected to the air flotation machine, the outlet end of the dissolved air pump is connected to the inlet end of the dissolved air tank, and the outlet end of the dissolved air tank is connected to the contact chamber of the air flotation machine through a release device.

[0009] Furthermore, several fixed packing materials are suspended inside the aerobic tank; A first aeration disc is provided below the fixed packing material.

[0010] Furthermore, the distance between the first aeration disc and the bottom of the aerobic tank is 20-40cm.

[0011] Furthermore, the organic wastewater treatment system also includes a blower; The bottom of the membrane filtration tank and the clear water tank are respectively equipped with a second aeration disc; The first aeration disc and the second aeration disc are respectively connected to the blower through pipes.

[0012] Furthermore, the outlet end of the bottom of the aerobic tank is connected to a return pump via a pipeline, and the outlet end of the return pump is connected to the sludge tank via a pipeline.

[0013] Furthermore, the dosing device includes a PAC dosing tank, a PAM dosing tank, and a caustic soda addition tank, which are respectively connected to the air flotation machine via pipelines; The air flotation machine is also equipped with a slag scraper at its upper part.

[0014] Furthermore, the self-cleaning device for the filter membrane includes a precision filter, a backwash pump, a product water pump, and a dosing tank; The inlet of the precision filter is connected to the clear water tank via a pipe, and the outlet of the precision filter is connected to the inlet of the backwash pump via a pipe. The backwash pump is equipped with a cleaning manifold at its outlet end, and the outlet end of the cleaning manifold is connected to several membrane filter modules through pipes. The dosing tank is connected to the main cleaning pipeline via a pipe. The inlet of the water pump is connected to the main cleaning pipe via a pipeline, and the outlet of the water pump is connected to the clear water tank via a pipeline. A valve is installed on the main cleaning pipe.

[0015] Furthermore, the sludge treatment device includes a sludge diaphragm pump, a sludge filter press, an air compressor, and a dosing tank; The inlet of the sludge diaphragm pump is connected to the sludge tank via a pipeline, and the outlet of the sludge diaphragm pump is connected to the sludge filter press via a pipeline. The air compressor is connected to the sludge diaphragm pump via a pipeline; A branch pipe is connected to the pipeline between the sludge diaphragm pump and the sludge filter press, and the inlet end of the branch pipe is connected to the dosing tank.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model aims to provide an organic wastewater treatment system that is widely applicable, highly automated, efficient and stable in treatment, and strong in resistance to shock loads. By integrating processes such as air flotation separation, aerobic biological treatment, and membrane filtration, it achieves efficient removal of suspended solids, oils, colloids, and organic pollutants from organic wastewater, thereby achieving the purpose of wastewater purification and recycling, and meeting the actual needs of industries such as food and feed for organic wastewater treatment.

[0017] 2. In this utility model, the equalization tank is used to receive organic wastewater and to aerate and stir it; the dissolved air flotation (DAF) machine is used to receive the organic wastewater from the equalization tank. Utilizing the dissolved air system of the DAF machine, a large number of microbubbles are generated in the water, causing air to adhere to the suspended particles in the organic wastewater in the form of highly dispersed microbubbles, creating a state where the density is less than water. Applying the principle of buoyancy, these particles float to the surface. Impurities that float to the surface and sediments that settle at the bottom are then discharged into the sludge tank, thereby removing most of the suspended solids, grease, and various colloidal substances from the wastewater. The remaining wastewater enters the aerobic tank; the aerobic tank receives the wastewater from the DAF machine. The aerobic tank contains a large number of fixed packing materials inoculated with aerobic microorganisms. An aeration system is installed approximately 30 cm from the bottom, and the tank water is aerated by the aerobic microorganisms. The metabolic process first oxidizes ammonia nitrogen in wastewater into nitrate, then reduces nitrate back into nitrogen gas for emission, achieving denitrification. Simultaneously, oxygen is used to metabolize organic matter, decomposing and transforming organic substances in the wastewater into carbon dioxide and water. The water treated by aerobic microorganisms in the aerobic tank then enters the membrane filtration tank. The membrane filtration tank contains multiple membrane filtration modules, each with an aeration pipe at the bottom. Aeration is adjusted to maintain dissolved oxygen within a set range. After membrane filtration, bacteria, suspended solids, and large organic molecules larger than the membrane pore size are filtered out, resulting in highly efficient purification. This purified water then enters the clear water tank for recycling. The clear water tank receives the purified water from the membrane filtration tank, and the membrane filtration modules are cleaned by a self-cleaning device.

[0018] 3. In this utility model, the outlet end of the sludge tank is connected to a sludge treatment device through a pipeline. When the sludge in the sludge tank accumulates to a preset position, the sludge transported to the sludge treatment device can be pressed and filtered, the sewage is returned to the aerobic tank for recycling, and the pressed sludge is transported off-site.

[0019] 4. In this invention, a dosing device is connected to the flotation machine via pipelines for adding various reagents to maintain the pH value of the wastewater within a set range. The dosing device automatically adjusts the amount of reagent added based on the actual pH value of the wastewater, ensuring optimal acidity and alkalinity during treatment, which improves the treatment efficiency of the flotation machine. Simultaneously, precise control of reagent addition effectively reduces reagent waste and lowers treatment costs. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of an organic wastewater treatment system provided by this utility model.

[0021] Explanation of reference numerals in the attached diagram: 1. Equalization tank; 2. Wastewater lift pump; 3. PAC dosing tank; 4. PAM dosing tank; 5. Caustic soda addition tank; 6. Air flotation unit; 7. Dissolved air pump; 8. Dissolved air tank; 9. Sludge scraper; 10. Aerobic tank; 11. Packing material; 12. First aeration disc; 13. Membrane filter tank; 14. Membrane filter assembly; 15. Clear water pump; 16. Clear water tank; 17. Dosing tank; 18. Valve; 19. Backwash pump; 20. Precision filter; 21. Permeate pump; 22. Blower; 23. Return pump; 24. Sludge tank; 25. Air compressor; 26. Sludge diaphragm pump; 27. Dosing tank; 28. Sludge filter press. Detailed Implementation

[0022] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0023] like Figure 1 As shown, the present invention provides an organic wastewater treatment system, which includes an equalization tank 1, an air flotation machine 6, an aerobic tank 10, a membrane filtration tank 13, and a clear water tank 16 connected in sequence by pipelines. The organic wastewater treatment system also includes a sludge tank 24. The inlet of the sludge tank 24 is connected to the air flotation unit 6, the aerobic tank 10 and the membrane filter tank 13 via pipes. The outlet of the sludge tank 24 is connected to a sludge treatment device via a pipe. A dosing device is connected to the air flotation machine 6 via a pipeline; The membrane filtration tank 13 is equipped with several membrane filtration modules 14, and the membrane filtration tank 13 is also equipped with a membrane self-cleaning device for cleaning the membrane filtration modules 14.

[0024] In this organic wastewater treatment system, the equalization tank 1 is used to receive organic wastewater. That is, the organic wastewater is concentrated in the equalization tank 1 for aeration and stirring treatment. If necessary, adjusting chemicals can be added to keep the pH value of the organic wastewater between 6.5 and 7.5.

[0025] After conditioning, the wastewater is pumped from the equalization tank 1 to the air flotation unit 6. Caustic soda, coagulant (PAC polyaluminum chloride), and flocculant (HPAM polyacrylamide) are added through the dosing device to maintain the pH value of the wastewater at 7.5-8.5. The dissolved air system of the air flotation unit 6 generates a large number of microbubbles in the wastewater, causing air to adhere to the suspended particles in the organic wastewater in the form of highly dispersed microbubbles, resulting in a density less than that of water. The principle of buoyancy is applied to make them float on the water surface. The impurities that float to the surface and the sediments that settle at the bottom are discharged into the sludge tank 24, thereby removing most of the solid suspended matter, grease, and various colloidal substances from the wastewater. The remaining wastewater enters the aerobic tank 10.

[0026] Because aerobic microorganisms exist in the aerobic tank 10, and an aeration system is installed about 30 cm from the bottom of the aerobic tank 10, the wastewater treated by the air flotation machine 6 enters the aerobic tank 10. By regulating the dissolved oxygen in the tank water to maintain at 2-4 mg / L, the aerobic microorganisms first oxidize the ammonia nitrogen in the wastewater into nitrate, and then reduce the nitrate into nitrogen gas for emission, thus achieving denitrification. At the same time, oxygen is used to metabolize organic matter, decompose and transform the organic matter in the wastewater, and convert it into carbon dioxide and water.

[0027] In addition, during the aerobic treatment process, the treatment effect of aerobic microorganisms needs to be evaluated regularly. This is done by taking samples from the outlet of aerobic tank 10, observing them in a graduated cylinder, and ensuring that the proportion of flocculent sediment remains at 20-30% within 30 minutes. Within aerobic tank 10, due to the slow water flow, heavy suspended solids will gradually settle at the bottom, forming activated sludge. When the proportion of flocculent sediment in the water of aerobic tank 10 exceeds 30%, some of the bottom sludge can be pumped into sludge tank 24.

[0028] After being treated by aerobic microorganisms in the aerobic tank 10, the water enters the membrane filtration tank 13. The membrane filtration tank 13 is equipped with multiple sets of membrane filtration modules 14, and an aeration system is installed below each module. The dissolved oxygen level in the water is maintained at 4-5 mg / L through the aeration system. After passing through the membrane filtration modules 14, bacteria, suspended solids, and large organic molecules larger than the membrane pore size are filtered out, resulting in highly efficient purification of the water, which is then recycled into the clear water tank 16.

[0029] In addition, the membrane filtration tank 13 is also equipped with a self-cleaning device for cleaning the membrane filtration assembly 14. The automatic cleaning of the membrane is as follows: when the water production flow of the membrane filtration assembly 14 is less than the minimum set value, the self-cleaning device will be automatically started in automatic mode. Sodium citrate or caustic soda and other cleaning agents are added to the water in the clear water tank 16 to backwash and clean the membrane in order to maintain the good water permeability of the membrane.

[0030] It should be noted that when the sludge in sludge tank 24 accumulates to a preset position, the sludge transported to the sludge treatment device can be filtered by pressure, the wastewater is returned to the aerobic tank for recycling, and the pressed sludge is transported off-site.

[0031] like Figure 1 As shown, in some embodiments of this utility model, the outlet end of the clear water tank 16 is connected to a water outlet pipe, and a clear water pump 15 is provided on the water outlet pipe.

[0032] The clean water pump 15 is responsible for drawing purified water from the clean water tank 16 and transporting it through the outlet pipe to subsequent use stages or discharge points. This design ensures that the system can continuously and stably provide purified water, meeting the high standards of water quality required in industrial production or environmental protection. At the same time, the selection of the clean water pump 15 also takes into account the principles of energy efficiency to reduce the operating costs of the entire wastewater treatment system.

[0033] like Figure 1 As shown, in some embodiments of this utility model, the outlet end of the equalization tank 1 is connected to the air flotation machine 6 via a pipeline; A sewage lift pump 2 is installed on the pipeline between the equalization tank 1 and the air flotation machine 6.

[0034] The dissolved air flotation (DAF) unit 6 is mainly used to remove suspended solids, grease, and some colloids from wastewater, improving the efficiency of subsequent treatment units. The wastewater lift pump 2 provides the necessary power to allow the wastewater to flow smoothly from the equalization tank 1 into the DAF unit 6. During wastewater treatment, the equalization tank 1 first balances the quantity and quality of the wastewater, and then the wastewater is pressurized by the wastewater lift pump 2 and transported to the DAF unit 6 for further treatment. This design not only ensures the continuity and stability of wastewater treatment but also effectively improves the overall treatment efficiency of the wastewater treatment system.

[0035] like Figure 1 As shown, in some embodiments of this utility model, the organic wastewater treatment system further includes a dissolved air tank 8 and a dissolved air pump 7. The inlet end of the dissolved air pump 7 is connected to the air flotation machine 6, the outlet end of the dissolved air pump 7 is connected to the inlet end of the dissolved air tank 8, and the outlet end of the dissolved air tank 8 is connected to the contact chamber of the air flotation machine 6 through a release device.

[0036] The dissolved air tank 8 is equipped with a device for generating microbubbles. These microbubbles effectively adsorb suspended solids, grease, and colloids in the wastewater, further improving wastewater treatment efficiency. The dissolved air pump 7 pressurizes the wastewater, after preliminary treatment by the flotation unit 6, and sends it into the dissolved air tank 8, ensuring thorough mixing between the wastewater and the microbubbles generated within. Subsequently, the mixture enters the contact chamber of the flotation unit 6 through a release device. In the contact chamber, the microbubbles further combine with impurities in the wastewater and rise to the surface, forming scum, thus purifying the wastewater. This design not only enhances the wastewater treatment effect but also ensures the continuity and stability of the treatment process, providing a strong guarantee for the efficient treatment of organic wastewater.

[0037] like Figure 1 As shown, in some embodiments of this utility model, a number of fixed packing materials 11 are suspended in the aerobic tank 10; the fixed packing materials 11 suspended in the aerobic tank 10 provide space for microorganisms to attach and grow, which is conducive to the formation and stability of microbial communities, thereby enhancing the ability to biodegrade organic pollutants.

[0038] like Figure 1 As shown, in some embodiments of this utility model, a first aeration disc 12 is provided below the fixed packing 11; In addition, the organic wastewater treatment system also includes blowers 22, and specifically, there can be multiple blowers 22; A second aeration disc is installed at the bottom of the membrane filtration tank 13 and the clear water tank 16 respectively; The first aeration disc 12 and the second aeration disc are respectively connected to the blower 22 through pipes; The first aeration disc 12 is located below the fixed packing 11. By injecting air into the wastewater, it increases the dissolved oxygen content in the wastewater, providing the necessary oxygen conditions for aerobic microorganisms and promoting the decomposition and transformation of organic matter.

[0039] Blower 22 serves as the air source, providing stable aeration power for the entire system. The use of multiple blowers 22 not only improves the system's aeration efficiency but also ensures flexible adjustment of the aeration volume under different operating conditions, meeting the needs of different treatment stages. The second aeration discs located at the bottom of the membrane filtration tank 13 and the clear water tank 16 are also connected to the blowers 22 via pipes, enabling further aeration treatment of the wastewater, which helps improve water quality and remove residual pollutants.

[0040] This design, through reasonable layout and configuration, makes full use of the degradation effect of microorganisms and the enhanced effect of aeration technology, achieving efficient treatment and purification of organic wastewater.

[0041] like Figure 1 As shown, in some embodiments of this utility model, valves are provided on the pipe between the first aeration disc 12 and the blower 22, and on the pipe between the second aeration disc and the blower 22. The valve's design allows operators to control the opening and closing of the aeration discs as needed, further adjusting the aeration rate. This flexible adjustment mechanism not only helps optimize treatment results but also saves energy while ensuring treatment quality. When the aeration requirement decreases at a certain treatment stage, operators can reduce the aeration rate by closing the corresponding valve, thus achieving more precise control.

[0042] like Figure 1 As shown, in some embodiments of this utility model, the distance between the first aeration disc 12 and the bottom of the aerobic tank 10 is 20-40cm.

[0043] This design ensures an effective contact area between the aeration discs and the wastewater, avoiding both over-aeration and increased energy consumption caused by excessive proximity, and under-aeration that could affect microbial activity due to excessive distance. The reasonable spacing results in more uniform aeration, which helps improve the uniformity of dissolved oxygen distribution in the wastewater, thereby enhancing the overall treatment efficiency of the aerobic tank. Furthermore, this spacing also considers ease of operation and maintenance, facilitating inspection, repair, or replacement of the aeration discs by staff.

[0044] like Figure 1 As shown, in some embodiments of this utility model, the outlet end of the bottom of the aerobic tank 10 is connected to a return pump 23 via a pipe, and the outlet end of the return pump 23 is connected to the sludge tank 24 via a pipe.

[0045] During the aerobic treatment process, the treatment effect of aerobic microorganisms needs to be evaluated regularly. This is done by taking samples from the outlet of aerobic tank 10 and observing them in a graduated cylinder. Within 30 minutes, the proportion of flocculent sediment should be maintained at 20-30%. In aerobic tank 10, due to the slow water flow, heavy solid suspended matter will gradually settle at the bottom, forming activated sludge. When the proportion of flocculent sediment in the water of aerobic tank 10 exceeds 30%, a portion of the bottom sludge is pumped to sludge tank 24 by return pump 23.

[0046] This design achieves effective recycling of activated sludge within the aerobic tank. Through a return pump, a portion of the aerobically treated sludge is returned to the sludge tank, where it can be further concentrated, digested, or subjected to other treatment processes. This return mechanism helps maintain sludge concentration and microbial activity in the aerobic tank, ensuring the stability and efficiency of the wastewater treatment process. Simultaneously, sludge recycling reduces sludge discharge, aligning with environmental protection and resource recycling principles. Furthermore, the rational layout and material selection of the return pipeline ensure smooth sludge return and corrosion resistance, extending the equipment's service life.

[0047] like Figure 1 As shown, in some embodiments of this utility model, valves are provided on the pipes between the aerobic tank 10 and the return pump 23, and on the pipes between the return pump 23 and the sludge tank 24.

[0048] This valve allows for the adjustment of the sludge return flow rate and direction by opening or closing it as needed. For example, if the sludge concentration in the aerobic tank 10 is too high or the treatment process needs adjustment, the valve can be adjusted to reduce or increase the amount of sludge returned. This design not only improves wastewater treatment efficiency but also enhances the system's adaptability and stability. Furthermore, the valve selection considers corrosion resistance and sealing performance, ensuring that leakage will not affect the normal operation of the system during long-term operation.

[0049] like Figure 1 As shown, in some embodiments of this utility model, the dosing device includes a PAC dosing tank 3, a PAM dosing tank 4, and a caustic soda addition tank 5. The PAC dosing tank 3, PAM dosing tank 4, and caustic soda addition tank 5 are respectively connected to the air flotation machine 6 through pipelines. The upper part of the air flotation machine 6 is also equipped with a slag scraper 9.

[0050] PAC dosing tank 3 is mainly used to add polyaluminum chloride (PAC), a commonly used inorganic coagulant that effectively removes suspended solids, colloids, and some dissolved organic matter from wastewater. PAM dosing tank 4 adds polyacrylamide (PAM), an organic flocculant that enhances flocculation, accelerates particle settling, and improves sludge dewatering performance. Caustic soda dosing tank 5 is used to adjust the pH of the wastewater, ensuring that subsequent treatment steps are carried out under optimal acid-base conditions.

[0051] These dosing devices are connected to the flotation unit 6 via a sophisticated piping system, ensuring that the chemicals are added to the wastewater evenly and accurately. The flotation unit 6 releases microbubbles, causing suspended solids, grease, and other impurities in the wastewater to adhere to the bubbles and float to the surface, forming scum. The scum scraper 9 continuously removes this scum, keeping the wastewater inside the flotation unit clean and further improving wastewater treatment efficiency.

[0052] In addition, dosing pumps are installed on the pipeline between PAC dosing tank 3 and flotation machine 6, the pipeline between PAM dosing tank 4 and flotation machine 6, and the pipeline between caustic soda addition tank 5 and flotation machine 6. These dosing pumps are responsible for drawing reagents such as PAC, PAM, and caustic soda from their respective dosing tanks and delivering them to the flotation unit 6 at a constant flow rate and pressure. The design of the dosing pumps ensures accurate metering and stable delivery of the reagents, avoiding waste and overdosing, thereby improving the efficiency and effectiveness of wastewater treatment. Simultaneously, the operating status of the dosing pumps is strictly monitored to ensure they are always in good working order, providing reliable support for wastewater treatment.

[0053] like Figure 1 As shown, in some embodiments of this utility model, the filter membrane self-cleaning device includes a precision filter 20, a backwash pump 19, a product water pump 21, and a dosing tank 17. The inlet of the precision filter 20 is connected to the clear water tank 16 via a pipe, and the outlet of the precision filter 20 is connected to the inlet of the backwash pump 19 via a pipe. The backwash pump 19 is equipped with a cleaning manifold at its outlet end, and the outlet end of the cleaning manifold is connected to several membrane filter modules 14 through pipes. The dosing tank 17 is connected to the main cleaning pipe via a pipeline; The inlet end of the water production pump 21 is connected to the main cleaning pipe through a pipeline, and the outlet end of the water production pump 21 is connected to the clear water tank 16 through a pipeline. Valve 18 is installed on the main cleaning pipe; Valve 18 controls the flow of liquid in the cleaning main pipe to ensure that chemicals and clean water can enter the membrane filter assembly 14 as needed for cleaning during backwashing. When backwashing of the membrane filter assembly 14 is required, valve 18 is operated to allow the cleaning agent in the dosing tank 17 to enter the membrane filter assembly 14 through the cleaning main pipe to clean the membrane surface and remove accumulated contaminants. Simultaneously, the backwash pump 19 provides power to ensure that the cleaning agent can evenly and powerfully flush the membrane surface. After cleaning, valve 18 is operated again to switch to clean water cleaning mode, using clean water from the clean water tank 16 to rinse the membrane filter assembly 14 and remove residual cleaning agent. The permeate pump 21 then pumps the clean water from the cleaning main pipe back to the clean water tank 16 after cleaning, achieving water resource recycling. The design of the entire membrane self-cleaning device ensures the efficient operation of the membrane filter assembly 14 while also achieving resource conservation and environmental protection.

[0054] Valves are installed on the main cleaning pipe, the pipe between the dosing tank 17 and the main cleaning pipe, and the pipe between the product water pump 21 and the main cleaning pipe. The valves installed on the main cleaning pipe precisely control the flow direction of clean water, ensuring that clean water can quickly and accurately enter the membrane filter module for cleaning when needed. The valves on the pipe between the dosing tank 17 and the main cleaning pipe regulate the supply of cleaning agent. Depending on the degree of membrane fouling, the concentration and flow rate of the cleaning agent are adjusted in a timely manner to achieve the best cleaning effect. The valves on the pipe between the product water pump 21 and the main cleaning pipe function after cleaning to control the backflow of clean water and avoid water waste. Through the synergistic effect of these valves, the entire organic wastewater treatment system operates more efficiently and environmentally friendly.

[0055] like Figure 1 As shown, in some embodiments of this utility model, multiple dosing tanks 17 are provided, and the multiple dosing tanks 17 are used for storing different drugs respectively; The setup of multiple dosing tanks allows for flexible adjustment of the dosage and ratio of different reagents according to the actual needs of wastewater treatment, thereby further optimizing the treatment effect and reducing treatment costs.

[0056] like Figure 1 As shown, in some embodiments of this utility model, the sludge treatment device includes a sludge diaphragm pump 26, a sludge filter press 28, an air compressor 25, and a dosing tank 27. The inlet end of the sludge diaphragm pump 26 is connected to the sludge tank 24 through a pipeline, and the outlet end of the sludge diaphragm pump 26 is connected to the sludge filter press 28 through a pipeline. Air compressor 25 is connected to sludge diaphragm pump 26 via pipeline; A branch pipe is connected to the pipeline between the sludge diaphragm pump 26 and the sludge filter press 28, and the inlet end of the branch pipe is connected to the dosing tank 27. The dosing tank 27 contains chemicals for sludge dewatering. During sludge treatment, the sludge is first pumped from the sludge tank 24 by the sludge diaphragm pump 26 and transported through pipelines to the sludge filter press 28. The air compressor 25 provides the necessary air pressure to the sludge diaphragm pump 26 to ensure its normal operation. Before the sludge enters the sludge filter press 28, chemicals from the dosing tank 27 are added to the sludge through branch pipes. The mixing of the chemicals with the sludge helps improve the dewatering efficiency. The sludge filter press 28 filters the mixed sludge, separating the water and forming a relatively dry sludge cake. The treated sludge cake can be further used as fertilizer in agriculture, horticulture, and other fields, realizing the resource utilization of sludge. The design of the entire sludge treatment device not only improves the efficiency of sludge treatment but also achieves sludge reduction, harmlessness, and resource recovery.

[0057] like Figure 1 As shown, in some embodiments of this utility model, valves are provided on the pipeline between the air compressor 25 and the sludge diaphragm pump 26, as well as on the branch pipelines; These valves are designed to precisely control flow rates, ensuring the stability and efficiency of the sludge treatment process. Adjustments to the operating pressure of the sludge diaphragm pump can be made by regulating the valves on the pipeline connecting the air compressor and the pump. Similarly, changes in the dosage of chemicals added to the sludge can be controlled by adjusting valves on branch pipelines. This design not only improves operational flexibility but also helps optimize sludge treatment results, making the entire organic wastewater treatment system more intelligent and automated.

[0058] like Figure 1 As shown, in some embodiments of this utility model, a level gauge is installed in the sludge tank 24. When the sludge in the sludge tank 24 accumulates to the level gauge position, the sludge diaphragm pump 26 will pump the sludge to the sludge filter press 28 for filtration. The wastewater is returned to the aerobic tank 10 for recycling, and the pressed sludge is transported off-site.

[0059] like Figure 1 As shown, in some embodiments of this utility model, the organic wastewater treatment system also includes a control system. Through the control system, the reflux time and sludge discharge time of the water in the membrane filter tank 13 can be set, and the sludge at the bottom can be pumped into the sludge tank 24 to keep the sludge concentration of the membrane filter tank 13 below 50%.

[0060] The control system can also monitor the dissolved oxygen concentration in the membrane filtration tank 13 in real time, ensuring the stable operation of the aeration system to maintain the dissolved oxygen in the tank water within the optimal range of 4-5 mg / L. Simultaneously, the control system can intelligently adjust the aeration intensity of the aerobic tank 10, optimizing the activity of aerobic microorganisms and ensuring wastewater treatment efficiency. Furthermore, the control system can record and analyze various data during the treatment process, providing a scientific basis for optimizing the wastewater treatment process.

[0061] This utility model provides an organic wastewater treatment system that is widely applicable, highly automated, efficient and stable in treatment, and strong against shock loads. By integrating processes such as air flotation separation, aerobic biological treatment, and membrane filtration, it achieves efficient removal of suspended solids, grease, colloids, and organic pollutants from organic wastewater, thereby achieving the purpose of wastewater purification and recycling, and meeting the actual needs of industries such as food and feed processing for organic wastewater treatment.

[0062] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

[0063] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0064] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An organic wastewater treatment system, characterized in that, It includes an equalization tank (1), an air flotation machine (6), an aerobic tank (10), a membrane filtration tank (13), and a clear water tank (16) connected in sequence. The air flotation machine (6) is connected to a dosing device via a pipeline. The organic wastewater treatment system also includes a sludge tank (24). The inlet of the sludge tank (24) is connected to the air flotation machine (6), the aerobic tank (10) and the membrane filter tank (13) through pipes. The outlet of the sludge tank (24) is connected to a sludge treatment device through a pipe. The membrane filtration tank (13) is provided with a number of membrane filtration components (14), and the membrane filtration tank (13) is also provided with a filter membrane self-cleaning device for cleaning the membrane filtration components (14).

2. The organic wastewater treatment system according to claim 1, characterized in that, The outlet end of the equalization tank (1) is connected to the air flotation machine (6) via a pipeline. A sewage lift pump (2) is installed on the pipeline between the regulating tank (1) and the air flotation machine (6).

3. The organic wastewater treatment system according to claim 1, characterized in that, It also includes a dissolved air tank (8) and a dissolved air pump (7), the inlet end of which is connected to the air flotation machine (6), the outlet end of which is connected to the inlet end of the dissolved air tank (8), and the outlet end of the dissolved air tank (8) is connected to the contact chamber of the air flotation machine (6) through a release device.

4. The organic wastewater treatment system according to claim 1, characterized in that, Several fixed packing materials (11) are suspended inside the aerobic tank (10). The first aeration disc (12) is provided below the fixed packing material (11).

5. The organic wastewater treatment system according to claim 4, characterized in that, The distance between the first aeration disc (12) and the bottom of the aerobic tank (10) is 20-40cm.

6. The organic wastewater treatment system according to claim 4, characterized in that, The organic wastewater treatment system also includes a blower (22); The bottom of the membrane filtration tank (13) and the clear water tank (16) are respectively provided with a second aeration disc; The first aeration disc (12) and the second aeration disc are respectively connected to the blower (22) through pipes.

7. The organic wastewater treatment system according to claim 1, characterized in that, The outlet end of the aerobic tank (10) is connected to a return pump (23) via a pipe, and the outlet end of the return pump (23) is connected to the sludge tank (24) via a pipe.

8. The organic wastewater treatment system according to claim 1, characterized in that, The dosing device includes a PAC dosing tank (3), a PAM dosing tank (4), and a caustic soda addition tank (5). The PAC dosing tank (3), PAM dosing tank (4), and caustic soda addition tank (5) are respectively connected to the air flotation machine (6) through pipelines. The upper part of the air flotation machine (6) is also equipped with a slag scraper (9).

9. The organic wastewater treatment system according to claim 1, characterized in that, The self-cleaning device for the filter membrane includes a precision filter (20), a backwash pump (19), a product water pump (21), and a dosing tank (17). The inlet end of the precision filter (20) is connected to the clear water tank (16) through a pipe, and the outlet end of the precision filter (20) is connected to the inlet end of the backwash pump (19) through a pipe. The backwash pump (19) has a cleaning manifold at its outlet end, and the outlet end of the cleaning manifold is connected to several membrane filter modules (14) through pipes. The dosing tank (17) is connected to the main cleaning pipe via a pipeline; The inlet end of the water production pump (21) is connected to the main cleaning pipe through a pipe, and the outlet end of the water production pump (21) is connected to the clear water tank (16) through a pipe. A valve (18) is installed on the main cleaning pipe.

10. The organic wastewater treatment system according to claim 1, characterized in that, The sludge treatment device includes a sludge diaphragm pump (26), a sludge filter press (28), an air compressor (25), and a dosing tank (27). The inlet end of the sludge diaphragm pump (26) is connected to the sludge tank (24) through a pipeline, and the outlet end of the sludge diaphragm pump (26) is connected to the sludge filter press (28) through a pipeline. The air compressor (25) is connected to the sludge diaphragm pump (26) through a pipeline; A branch pipe is connected to the pipeline between the sludge diaphragm pump (26) and the sludge filter press (28), and the inlet end of the branch pipe is connected to the dosing tank (27).

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