CN219194734U

CN219194734U - High concentration cultivation wastewater denitrification processing system

Info

Publication number: CN219194734U
Application number: CN202223408363.8U
Authority: CN
Inventors: 戴圣根; 佘晓彬; 陈元辉; 梁泽通; 余紫妍; 陈冠鹏; 黄仲贤; 陈爱荣
Original assignee: Guangdong Yikangsheng Environmental Protection Service Co ltd
Current assignee: Guangdong Yikangsheng Environmental Protection Service Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-06-16
Anticipated expiration: 2032-12-15

Abstract

The utility model relates to a high-concentration aquaculture wastewater denitrification treatment system, which comprises a water collecting tank, a solid-liquid separation system, a dosing sedimentation tank, a UASB anaerobic tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, a secondary biochemical sedimentation tank, a tertiary anoxic tank, a tertiary biochemical sedimentation tank, a dosing final sedimentation tank and a clean water tank which are sequentially communicated, wherein a first sludge return pipeline is arranged between the tertiary biochemical sedimentation tank and the tertiary anoxic tank, so that activated sludge of the tertiary biochemical sedimentation tank flows back to the tertiary anoxic tank to form an independent biochemical system, thereby being beneficial to the targeted cultivation of high-efficiency special denitrifying bacteria, enabling nitric acid nitrogen in a water body to be efficiently converted into nitrogen in a specific anoxic environment, separating from the water body, reducing total nitrogen of discharged water and avoiding eutrophication of a receiving water body of discharged water; and compared with the traditional treatment process for removing total nitrogen, the method can reduce the addition amount of the carbon source and has good economic benefit.

Description

High concentration cultivation wastewater denitrification processing system

Technical Field

The utility model relates to the technical field of wastewater treatment, in particular to a high-concentration cultivation wastewater denitrification treatment system.

Background

The high-concentration aquaculture wastewater generally contains a large amount of pollutants such as COD, ammonia nitrogen and total phosphorus, the COD and the total phosphorus are generally easy to remove, but after the ammonia nitrogen is treated by the wastewater treatment system, part of the ammonia nitrogen is converted into nitric acid nitrogen, and although the water body is not easy to blacken and stink after being treated, nitrogen element still exists in the water body, and the water body eutrophication can be caused by the discharge of the nitrogen element into the nature.

The high-concentration cultivation wastewater generally adopts a pretreatment system, anaerobic fermentation, secondary AO biochemistry, secondary sedimentation tank and chemical adding final sedimentation treatment process. The effluent of the secondary sedimentation tank still has a large amount of nitric acid, and the rear end of the secondary sedimentation tank has no effect of removing nitrogen element by a physical and chemical treatment system such as dosing precipitation and the like. If the effluent has the emission requirement of total nitrogen, the total nitrogen is difficult to reach the standard, or a large amount of carbon sources are added for reaching the standard of the total nitrogen of the effluent, so that the operation cost is increased, and the COD of the effluent does not reach the standard.

Disclosure of Invention

In order to solve the problems, the utility model provides a high-concentration cultivation wastewater denitrification treatment system.

In order to achieve the above object, the present utility model is realized by the following technical scheme:

a high-concentration cultivation wastewater denitrification treatment system comprises a water collecting tank, a solid-liquid separation system, a dosing sedimentation tank, a UASB anaerobic tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, a secondary biochemical sedimentation tank, a tertiary anoxic tank, a tertiary biochemical sedimentation tank, a dosing final sedimentation tank and a clean water tank which are sequentially communicated; a first sludge return pipeline is arranged between the three-stage biochemical sedimentation tank and the three-stage anoxic tank.

Further, a second sludge return pipeline is arranged between the secondary biochemical sedimentation tank and the primary anoxic tank.

Further, the secondary aerobic tank is communicated with the primary anoxic tank through a nitrifying liquid return pipeline.

Further, a strong oxidation system is arranged between the three-stage biochemical sedimentation tank and the chemical adding final sedimentation tank.

Further, a submersible pusher is arranged in the three-stage anoxic tank.

Further, a disinfection tank is arranged between the dosing final sedimentation tank and the clean water tank.

Further, both the dosing sedimentation tank and the dosing final sedimentation tank are provided with lime adding pipelines and PAM adding pipelines.

Furthermore, the final dosing sedimentation tank is also provided with a PAC adding pipeline.

Further, a plug flow stirrer is arranged in the water collecting tank.

Further, a water inlet of the water collecting tank is provided with a grating.

The beneficial effects of the utility model are as follows: the activated sludge of the three-stage biochemical sedimentation tank flows back to the three-stage anoxic tank to form an independent biochemical system, which is favorable for the targeted cultivation of high-efficiency special denitrifying bacteria, so that nitric acid nitrogen in the water body is efficiently converted into nitrogen in a specific anoxic environment, the nitrogen is separated from the water body, the total nitrogen of discharged water is reduced, and the eutrophication of the receiving water body of discharged water is avoided; and compared with the traditional treatment process for removing total nitrogen, the method can reduce the addition amount of the carbon source and has good economic benefit.

Drawings

FIG. 1 is a flow chart of the system of the present utility model.

Detailed Description

In order to further describe the technical means and effects adopted by the utility model for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the utility model with reference to the attached drawings and the preferred embodiment.

As shown in figure 1, the high-concentration aquaculture wastewater denitrification treatment system comprises a water collecting tank, a solid-liquid separation system, a dosing sedimentation tank, a UASB anaerobic tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, a secondary biochemical sedimentation tank, a tertiary anoxic tank, a tertiary biochemical sedimentation tank, a dosing final sedimentation tank and a clean water tank which are sequentially communicated; the water collecting tank is used for collecting the cultivation wastewater, a grid is arranged at a water inlet of the water collecting tank, garbage with larger volume is isolated, a pump in the water collecting tank is prevented from being blocked, and a plug flow stirrer is arranged in the water collecting tank and is used for homogenizing water quality and preventing excrement and slag of the wastewater from depositing; the solid-liquid separation system comprises a solid-liquid separator, which is the prior art; the dosing sedimentation tank is provided with a lime adding pipeline and a PAM adding pipeline; therefore, the waste water in the water collecting tank is pumped into the solid-liquid separator through the pump to separate the manure, the filtrate enters the dosing sedimentation tank, lime and PAM are added into the dosing sedimentation tank for coagulation and flocculation sedimentation, and the effects of dephosphorization and further removal of solid pollutants are achieved; the second sludge reflux pipeline is arranged between the second biochemical sedimentation tank and the first anoxic tank, the second aerobic tank is communicated with the first anoxic tank through the nitrifying liquid reflux pipeline, so that sludge in the second biochemical sedimentation tank and nitrifying liquid in the second aerobic tank are refluxed to the first anoxic tank, and nitrate nitrogen in the wastewater is converted into nitrogen for removal through biochemical action of denitrifying bacteria groups, and meanwhile, a part of organic matters can be removed;

the first sludge return pipeline is arranged between the three-stage biochemical sedimentation tank and the three-stage anoxic tank, so that the activated sludge of the three-stage biochemical sedimentation tank returns to the three-stage anoxic tank to form an independent biochemical system, which is beneficial to the targeted cultivation of high-efficiency special denitrifying bacteria, so that nitrogen nitrate in a water body is efficiently converted into nitrogen in a specific anoxic environment, the nitrogen is separated from the water body, the total nitrogen of discharged water is reduced, and the eutrophication of a receiving water body of discharged water is avoided; compared with the traditional treatment process, the total nitrogen is removed, the carbon source adding amount can be reduced, and the method has good economic benefit; and install dive impeller in the tertiary anoxic tank, promote activated sludge and waste water intensive mixing, more with the mud backward flow of tertiary biochemical sedimentation tank, the water inlet linkage cooperation of system is closed when not intaking, save the energy consumption, extension equipment life.

Wherein, a strong oxidation system is arranged between the three-stage biochemical sedimentation tank and the chemical adding final sedimentation tank, and the strong oxidation system comprises an oxidation tank for adding strong oxidants such as bleaching powder, so that the strong oxidants and the wastewater fully react to further remove COD and decolor; wherein a disinfection tank is arranged between the dosing final sedimentation tank and the clean water tank, sodium hypochlorite is added into the disinfection tank for further sterilization and decolorization; the final sedimentation tank for adding the medicine is provided with a lime adding pipeline, a PAM adding pipeline and a PAC adding pipeline, so that lime, PAC and PAM can be added for coagulation, flocculation and precipitation, and the effects of dephosphorization and suspended matter removal are achieved.

The working principle of the utility model is as follows:

as shown in figure 1, the cultivation wastewater is collected in a water collecting tank, then the wastewater in the water collecting tank is pumped into a solid-liquid separator through a pump to separate manure, the filtrate enters a dosing sedimentation tank, lime and PAM are added into the dosing sedimentation tank to coagulate and sediment, then the supernatant of the dosing sedimentation tank is pumped into a UASB anaerobic tank, after the reaction in the UASB anaerobic tank, the wastewater enters a first-stage anoxic tank, then the wastewater flows through a first-stage aerobic tank, a second-stage anoxic tank, a second-stage aerobic tank and a second-stage biochemical sedimentation tank in sequence, wherein the nitrifying liquid of the second-stage aerobic tank enters the first-stage anoxic tank through a nitrifying liquid return pipeline, the activated sludge flows back into the first-stage anoxic tank through a second sludge return pipeline after the sedimentation in the second-stage biochemical sedimentation tank, the supernatant of the activated sludge flows back into the third-stage biochemical sedimentation tank after the third-stage biochemical sedimentation tank is settled through a first sludge return pipeline, the third-stage anoxic tank and the third-stage biochemical sedimentation tank form an independent ecological system, the denitrification microorganism can be cultured in sequence, the biological denitrification can be enhanced, the biological denitrification can be performed sequentially, and the wastewater can be subjected to oxidation and final oxidation by adding PAC, and the oxidation agent, the wastewater enters a disinfection tank and the final-stage oxidation agent, and the sewage can be subjected to the disinfection tank.

Although the present utility model has been described in terms of the preferred embodiments, it should be understood that the present utility model is not limited to the specific embodiments, but is capable of numerous modifications and equivalents, and alternative embodiments and modifications of the embodiments described above, without departing from the spirit and scope of the present utility model.

Claims

1. The high-concentration aquaculture wastewater denitrification treatment system is characterized by comprising a water collecting tank, a solid-liquid separation system, a dosing sedimentation tank, a UASB anaerobic tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, a secondary biochemical sedimentation tank, a tertiary anoxic tank, a tertiary biochemical sedimentation tank, a dosing final sedimentation tank and a clean water tank which are sequentially communicated; a first sludge return pipeline is arranged between the three-stage biochemical sedimentation tank and the three-stage anoxic tank.

2. The high concentration aquaculture wastewater denitrification treatment system according to claim 1, wherein a second sludge return line is provided between the secondary biochemical sedimentation tank and the primary anoxic tank.

3. The system for denitrification of high concentration aquaculture wastewater according to claim 1, wherein the secondary aerobic tank is in communication with the primary anoxic tank through a nitrifying liquid return line.

4. The system for denitrification of high concentration aquaculture wastewater according to claim 1, wherein a strong oxidation system is provided between the three-stage biochemical sedimentation tank and the final dosing sedimentation tank.

5. The system for denitrification of high concentration aquaculture wastewater according to claim 1, wherein a submerged impeller is installed in the three-stage anoxic tank.

6. The system for denitrification of high concentration aquaculture wastewater according to claim 1, wherein a disinfection tank is provided between the final dosing sedimentation tank and the clean water tank.

7. The system for denitrification of high concentration aquaculture wastewater according to claim 1, wherein both the dosing sedimentation tank and the dosing final sedimentation tank are equipped with lime addition piping and PAM addition piping.

8. The system for denitrification of high concentration aquaculture wastewater according to claim 7, wherein the final dosing sedimentation tank is further equipped with PAC addition lines.

9. The system for denitrification of high concentration aquaculture wastewater according to claim 1, wherein a plug flow mixer is installed in the water collection tank.

10. The system for denitrification of high concentration aquaculture wastewater according to claim 1, wherein the water inlet of the water collection tank is provided with a grating.