Sewage treatment device for pig factory

Abstract

The utility model provides a sewage treatment device for a pig factory, which relates to the technical field of sewage pretreatment and comprises a grating tank, a regulating tank, a two-stage solid-liquid separator, a primary settling tank, a transfer tank, an air flotation solid separator and an AO biochemical system which are connected in sequence, a sludge output port of the AO biochemical system is connected to a sludge tank, and an output port of the sludge tank is connected to an adjusting tank; a sewage output port of the adjusting tank is connected to the AO biochemical system, and a sludge output port of the adjusting tank is connected to the two-stage solid-liquid separator; and a charging hole of the adjusting tank is connected with a flocculating agent adding tank. The residual sludge generated in the AO biochemical system is repeatedly utilized, so that the cyclic utilization of resources in the device is promoted, the sludge discharge amount is reduced, the treatment cost is reduced, the use amount of chemical agents is greatly reduced, the economic benefit is improved, and beneficial effects are brought to environmental protection.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage pretreatment, in particular to a piggery sewage treatment device. Background Art

[0002] Piggery wastewater often contains large amounts of suspended solids. The traditional method for solid-liquid separation in piggery wastewater pretreatment is chemical flocculation, which involves adding polyacrylamide and polyaluminum chloride to the wastewater to rapidly aggregate and settle suspended solids and colloidal particles. However, while this traditional method effectively separates pollutants from wastewater, it relies on a high dosage of chemical reagents, resulting in high economic costs and potential adverse environmental impacts. Utility Model Content

[0003] The utility model provides a technical solution to the above-mentioned technical problems as follows: a pig farm sewage treatment device, characterized in that it comprises a grille tank, a regulating tank, a two-stage solid-liquid separator, a primary sedimentation tank, a transfer tank, an air flotation solid separator and an AO biochemical system connected in sequence; the sludge output port of the AO biochemical system is connected to the sludge tank, and the output port of the sludge tank is connected to the regulating tank; the sewage output port of the regulating tank is connected to the AO biochemical system, and the sludge output port of the regulating tank is connected to the two-stage solid-liquid separator; the feeding port of the regulating tank is connected to a flocculant addition tank.

[0004] Preferably, the two-stage solid-liquid separator and the sludge output port of the primary sedimentation tank are connected to the sludge yard.

[0005] Preferably, the output port of the sludge tank is also connected to a sludge compressor.

[0006] Preferably, the air flotation solid separator is fixedly connected to an air compressor.

[0007] Preferably, the sewage outlet of the AO biochemical system is connected to a clean water tank.

[0008] Preferably, the flocculant addition tanks are polyacrylamide addition tank and polyaluminium chloride addition tank respectively.

[0009] The beneficial effects of the present invention are as follows: the present invention transfers the activated excess sludge generated in the AO biochemical system to the sludge pool, adds an equal proportion of excess sludge thereto according to the amount of sewage transported in the regulating tank, fully mixes the sewage and excess sludge, and allows the microorganisms in the excess sludge to fully contact the organic matter in the sewage, accelerating degradation. After the flocculants are added and the flocculants are precipitated, the supernatant in the regulating tank is directly transferred to the AO living system through a pipeline for biochemical treatment. The AO living system will then generate activated excess sludge, which can be put back into the regulating tank for utilization. The reuse of the excess sludge generated in the AO biochemical system promotes the recycling of resources in the device, reduces the amount of sludge discharged, reduces treatment costs, and greatly reduces the use of chemical agents, thereby improving the overall efficiency and sustainability of sewage treatment, increasing economic benefits, and having a beneficial impact on environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] In the figure: 1. Raw sewage input pump, 2. Screen tank, 3. Equalization tank, 4. Two-stage solid-liquid separator, 5. Sludge yard, 6. Residual sludge input pump, 7. Primary sedimentation tank, 8. Sludge tank, 9. Transfer tank, 10 Flotation solid separator, 11. Air compressor, 12. AO biochemical system, 13. Clear water tank, 14. Field, 15. Sludge compressor, 16. Polyacrylamide addition tank, 17. Polyaluminium chloride addition tank, 18. Sewage output pump, 19. Sewage input pump, 20. Residual sludge output pump, 21. Sludge input pump 1, 22. Sludge input pump 2, 23. Sludge input pump 3. DETAILED DESCRIPTION

[0012] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0013] As shown in the accompanying drawings, this embodiment provides a pig farm sewage treatment device, including a grille tank 2, a regulating tank 3, a two-stage solid-liquid separator 4, a primary sedimentation tank 7, a transfer tank 9, a flotation solid separator 10 and an AO biochemical system 12 connected in sequence; the sludge output port of the AO biochemical system 12 is connected to the sludge tank 8, and the sludge tank 8 is connected to the regulating tank 3; the sewage output port of the regulating tank 3 is connected to the AO biochemical system 12, and the sludge output port of the regulating tank 3 is connected to the two-stage solid-liquid separator 4; the feeding port of the regulating tank 3 is connected to the flocculant addition tank, which are a polyacrylamide addition tank 16 and a polyaluminum chloride addition tank 17 respectively.

[0014] The sewage is first connected to the sewage inlet of the grille pool 2 through the pipeline of the raw sewage input pump 1, the sewage output port of the grille pool 2 is connected to the sewage inlet of the regulating pool 3 through a pipeline, the sludge output port of the regulating pool 3 is connected to the pipeline of the sludge input pump 21, the sludge input pump 21 is then connected to the two-stage solid-liquid separator 4 through a pipeline, the sewage output port of the two-stage solid-liquid separator 4 is connected to the sewage inlet of the primary sedimentation tank 7 through a pipeline, the sewage output port of the primary sedimentation tank 7 is connected to the sewage inlet of the transfer tank 9 through a pipeline, the sewage output port of the transfer tank 9 is connected to the sewage input pump 19 pipeline, the sludge input pump 19 is then connected to the flotation solid separator 10 through a pipeline, the flotation solid separator 10 is fixedly connected to an air compressor 11, and the sewage output port of the flotation solid separator 10 is connected to the sewage inlet of the AO biochemical system 12 through a pipeline.

[0015] The sludge output port of the AO biochemical system 12 is connected to the excess sludge output pump 20 via a pipeline, which is then connected to the sludge tank 8 via a pipeline. The sludge output port of the sludge tank 8 is connected to the excess sludge input pump 6 via a pipeline, which is then connected to the excess sludge input port of the regulating tank 3 via a pipeline. The sewage output port of the regulating tank 3 is connected to the sewage output pump 18 via a pipeline, which is then connected to the sewage input port of the AO biochemical system 12 via a pipeline. The feeding port of the regulating tank 3 is connected to the polyacrylamide addition tank 16 and the polyaluminum chloride addition tank 17 via a pipeline.

[0016] Raw sewage is transferred to the screen tank 2 via the raw sewage input pump 1. The screen tank 2 can remove larger suspended debris, hair, feed residue, etc. in the sewage, preventing pipe or pump blockage and ensuring the smooth operation of subsequent equipment. The sewage enters the regulating tank 3 through the pipeline. At this time, the residual sludge from the AO biochemical system 12 is added to the sewage in the regulating tank 3. The mixing equipment in the regulating tank 3 is used to fully mix the sewage and the residual sludge, and evenly distribute the microorganisms in the residual sludge into the sewage, promoting contact between organic matter and microorganisms and accelerating the degradation process. Then, polyacrylamide from the polyacrylamide addition tank 16 and polyaluminum chloride from the polychlorination addition tank 17 are added to the regulating tank 3 in sequence. Stirring is continued for a period of time, usually several minutes to more than ten minutes, to ensure that the polyacrylamide and polyaluminum chloride fully act on the suspended matter and colloids in the sewage to form stable flocs. The stirring is then stopped and the mixed liquid is allowed to stand for a period of time. The formed flocs naturally settle to the bottom of the tank under the action of gravity. At this time, the sewage output pump 18 connected to the sewage output pipe of the regulating tank 3 will draw out the supernatant, and then send the sewage into the AO biochemical system 12 through the pipe, and the sludge settled to the bottom of the regulating tank 3 will enter the two-stage solid-liquid separator 4 through the sludge input pump 21. In the two-stage solid-liquid separator 4, the water in the sludge is further squeezed out by pressure, and the squeezed water enters the primary sedimentation tank 7 through a pipe. The sewage entering the primary sedimentation tank 7 will undergo initial sedimentation, and then the sewage after sedimentation will enter the transfer tank 9 through a pipe for buffering. The buffered sewage will enter the flotation solid separator 10 through the sewage input pump 19. The flotation solid separator 10 will blow air into the sewage. The air enters the water to generate bubbles, and the bubbles will blow out the residual bacteria in the sewage. The blown air carrying bacteria is compressed by the air compressor 11, and the remaining sewage will be further purified. The purified sewage will be input into the AO biochemical system 12 through a pipe. Whether it is sewage from the regulating tank 3 or sewage from the flotation solid separator 10, it will be biochemically treated in the AO biochemical system 12, and the metabolic action of microorganisms will be used to further degrade the organic matter therein to improve the water quality.

[0017] The wastewater after biochemical treatment will precipitate residual sludge at the end of AO biochemical system 12. These residual sludges are composed of complex biological communities, mycelium, dissolved organic matter, inorganic particles and other components, which are connected to each other through sol groups to form stable agglomerates. These agglomerates have compact structures and obvious surface area advantages. Their surfaces can expose more active sites and have good adsorption and flocculation capabilities. Therefore, the residual sludge produced in AO biochemical system 12 is a form of activated sludge. This part of the residual sludge with activity is connected to the residual sludge through the residual The sludge input pump 20 transmits the sludge into the sludge pool 8, and then according to the input amount of the original sewage of the pig farm and the mass ratio of sewage to residual sludge of 10:1, the required residual sludge is calculated, and the required residual sludge is added to the regulating tank 3 through the residual sludge input pump 6. In this way, the residual sludge in the AO biochemical system 12 can be reused, which not only reduces the amount of sludge discharged, but also greatly reduces the input amount of polyacrylamide and polyaluminum chloride, greatly reduces costs, reduces the use of chemical agents, and improves the overall efficiency and sustainability of sewage treatment, which has a beneficial impact on environmental protection.

[0018] The sludge output port of the two-stage solid-liquid separator 4 is connected to the sludge input pump 3 23 through a pipeline, and the sludge output port of the primary sedimentation tank 7 is connected to the sludge input pump 2 22 through a pipeline. The sludge input pump 2 22 and the sludge input pump 3 23 are both connected to the sludge yard 5. The sludge squeezed in the two-stage solid-liquid separator 4 and the sludge settled in the primary sedimentation tank 7 will be transported to the sludge yard 5, and these sludges will be landfilled or incinerated.

[0019] The sludge tank 8 is connected to a sludge compressor 15 via a pipeline. The redundant and useless sludge in the sludge tank 8 is transferred to the sludge compressor 15 via the pipeline, and the redundant sludge is compressed into a mud cake.

[0020] The sewage outlet pipe of the AO biochemical system 12 is connected to the clean water tank 13. The degraded water in the AO biochemical system 12 will be introduced into the clean water tank through the pipe. The sewage will undergo the final purification in the clean water tank. Then, after a series of purifications, the water will become production water and be introduced into the field 14.

[0021] This device can reuse a portion of the excess sludge in the AO biochemical system 12, promote the recycling of resources within the system, reduce the amount of sludge discharged, and reduce treatment costs. In addition, the addition of excess sludge can significantly reduce dependence on purchased polyacrylamide and polyaluminum chloride, saving at least 70% of the use of polyacrylamide and polyaluminum chloride, greatly reducing the use of chemical agents in the entire sewage treatment process, improving the overall efficiency and sustainability of sewage treatment, improving economic benefits, and having a beneficial impact on environmental protection.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pig farm sewage treatment device, characterized in that: It comprises a grid tank (2), a regulating tank (3), a two-stage solid-liquid separator (4), a primary sedimentation tank (7), a transfer tank (9), an air-floating solid separator (10) and an AO biochemical system (12) which are connected in sequence; The sludge output port of the AO biochemical system (12) is connected to the sludge tank (8), and the output port of the sludge tank (8) is connected to the regulating tank (3); The sewage outlet of the regulating tank (3) is connected to the AO biochemical system (12), and the sludge outlet of the regulating tank (3) is connected to the two-stage solid-liquid separator (4); the feeding port of the regulating tank (3) is connected to the flocculant addition tank.

2. A pig farm wastewater treatment device according to claim 1, characterized in that: The sludge output ports of the two-stage solid-liquid separator (4) and the primary sedimentation tank (7) are connected to the sludge yard (5).

3. A piggery wastewater treatment device according to claim 1, characterized in that: The output port of the sludge tank (8) is also connected to a sludge compressor (15).

4. A piggery wastewater treatment device according to claim 1, characterized in that: The air-floating solid separator (10) is fixedly connected to an air compressor (11).

5. The pig farm wastewater treatment device according to claim 1, characterized in that: The sewage outlet of the AO biochemical system (12) is connected to the clean water tank (13).

6. A piggery wastewater treatment device according to claim 1, characterized in that: The flocculant addition tank comprises a polyacrylamide addition tank (16) and a polyaluminium chloride addition tank (17).

Images