CN217051967U

CN217051967U - Breeding wastewater treatment system

Info

Publication number: CN217051967U
Application number: CN202220630502.2U
Authority: CN
Inventors: 张雷; 门坤阔; 王艳; 潘建通; 陈凯华; 迟金宝; 黄文涛; 汪翠萍; 杨岗
Original assignee: Beijing Bohuite Environmental Technology Co ltd
Current assignee: Beijing Bohuite Environmental Technology Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-07-26
Anticipated expiration: 2032-03-21

Abstract

The utility model relates to the technical field of sewage treatment, and provides a breeding wastewater treatment system, including the pretreatment unit, biochemical treatment unit and the advanced treatment unit that communicate in proper order, biochemical treatment unit includes N reaction zone, settling zone and backward flow mud air stripping district that communicate in proper order, and the reaction zone includes anoxic zone, aeration zone and backward flow waste water air stripping district, and aeration zone water inlet and anoxic zone delivery port communicate, and backward flow waste water air stripping district water inlet communicates with aeration zone, and backward flow waste water air stripping district delivery port communicates with anoxic zone, is equipped with backward flow waste water air stripping device in the backward flow waste water air stripping district; an inlet of the return sludge gas stripping area is communicated with a sludge return port of the precipitation area, an outlet of the return sludge gas stripping area is communicated with one or more of the N reaction areas, and a return sludge gas stripping device is arranged in the return sludge gas stripping area. The treated water body can reach the discharge standard, and the aquaculture wastewater treatment system does not relate to an anaerobic treatment process, simplifies the treatment process and improves the operation stability.

Description

Breeding wastewater treatment system

Technical Field

The utility model relates to a sewage treatment technical field especially relates to a breed effluent disposal system.

Background

In recent years, with the continuous expansion of the breeding scale and the rapid increase of the breeding quantity, a large amount of livestock and poultry excrement and sewage becomes a pollution source, if the pollution generated by the farms cannot be treated in time, the pollution can cause great harm to the environment, the ecological environment is deteriorated, the quality of livestock and poultry products is reduced, the human health is endangered, the lag of pollution treatment technology of the breeding industry can seriously restrict the sustainable development of the breeding industry, and the breeding wastewater can be treated up to the standard.

The aquaculture wastewater system in the prior art is provided with an anaerobic treatment process to improve the treatment effect on aquaculture wastewater, but because anaerobic microorganisms are sensitive to toxic substances, the operation of an anaerobic processor is easy to be unstable in the process of carrying out anaerobic treatment on aquaculture wastewater, so that the operation of the whole treatment system is unstable, and the flow of the whole treatment system is too long due to too long treatment time of the anaerobic treatment process.

SUMMERY OF THE UTILITY MODEL

The utility model provides a breed effluent disposal system for solve breed effluent disposal system operation unstable among the prior art and handle the defect of flow overlength.

The utility model provides a breed effluent disposal system, including pretreatment unit, biochemical treatment unit and advanced treatment unit, pretreatment unit is used for filtering breed waste water, advanced treatment unit is used for right water after biochemical treatment unit handles carries out decoloration disinfection treatment, biochemical treatment unit includes:

the water inlet of the first reaction zone is communicated with the water outlet of the pretreatment unit, the N reaction zones are sequentially communicated, and N is greater than or equal to 1; the reaction zone comprises an anoxic zone, an aeration zone and a reflux wastewater gas stripping zone, wherein a water inlet of the aeration zone is communicated with a water outlet of the anoxic zone, a water inlet of the reflux wastewater gas stripping zone is communicated with the aeration zone, a water outlet of the reflux wastewater gas stripping zone is communicated with the anoxic zone, and a reflux wastewater gas stripping device is arranged in the reflux wastewater gas stripping zone;

a water inlet of the sedimentation zone is communicated with a water outlet of the Nth reaction zone, and a water outlet of the sedimentation zone is communicated with the advanced treatment unit;

and an inlet of the return sludge gas stripping area is communicated with a sludge return port of the settling area, an outlet of the return sludge gas stripping area is communicated with one or more of the N reaction areas, and a return sludge gas stripping device is arranged in the return sludge gas stripping area.

According to the utility model provides a pair of breed effluent disposal system, biochemical treatment unit includes the biochemical treatment pond, N the reaction zone the settling zone with backward flow mud air stripping is distinguished in the biochemical treatment pond.

According to the utility model provides a pair of breed effluent disposal system, N the reaction zone includes first reaction zone and second reaction zone, the water inlet of first reaction zone with the delivery port intercommunication of preprocessing unit, the water inlet of second reaction zone with the delivery port intercommunication of first reaction zone, the delivery port of second reaction zone with the water inlet intercommunication of settling zone, just the export in backward flow mud air-lift district with first reaction zone and/or second reaction zone intercommunication.

According to the utility model provides a pair of breed effluent disposal system, be provided with aeration equipment in the aeration zone and be used for promoting aeration equipment's first hoisting device, first hoisting device with the pool wall top in biochemical treatment pond is connected.

According to the utility model provides a pair of breed effluent disposal system, backward flow waste water air stripping device includes:

the air pipeline is used for being connected with the air supply device;

the exhaust assembly is communicated with the air pipeline, a plurality of exhaust ports are arranged on the exhaust assembly, and the exhaust ports are arranged upwards.

According to the utility model provides a pair of aquaculture wastewater treatment system, the water inlet in backward flow waste water air stripping district is close to the bottom setting in backward flow waste water air stripping district, the delivery port in backward flow waste water air stripping district is close to the top setting in backward flow waste water air stripping district.

According to the utility model provides a pair of breed effluent disposal system, be provided with in the backward flow waste water air stripping district and be used for promoting the second hoisting device of backward flow waste water air stripping device, second hoisting device with the pool wall top in biochemical treatment pond is connected.

According to the utility model provides a pair of breed effluent disposal system, the preprocessing unit includes:

the water collecting tank is used for collecting the breeding wastewater;

and the water inlet of the filtering unit is communicated with the water outlet of the water collecting tank, and the water outlet of the filtering unit is communicated with the water inlet of the first reaction zone.

According to the utility model provides a pair of breed effluent disposal system, the filter unit includes:

a water inlet of the hydraulic screen is communicated with a water outlet of the water collecting tank;

the water inlet of the primary sedimentation tank is communicated with the water outlet of the hydraulic screen;

and a water inlet of the air flotation unit is communicated with a water outlet of the primary sedimentation tank, and a water outlet of the air flotation unit is communicated with a water inlet of the first reaction zone.

According to the utility model provides a pair of breed effluent disposal system, the advanced treatment unit includes:

the water inlet of the coagulating sedimentation unit is communicated with the water outlet of the sedimentation area, and the coagulating sedimentation unit is provided with a coagulating and dosing port for a coagulant to enter;

the water inlet of the disinfection and decoloration unit is communicated with the water outlet of the coagulating sedimentation unit, and the disinfection and decoloration unit is provided with a medicine adding port for the disinfection and decoloration medicine to enter.

The utility model provides a breed effluent disposal system, through the preprocessing unit, biochemical treatment unit and advanced treatment unit are handled breed waste water in proper order, make the water after handling can reach emission standard, and set up backward flow waste water air-lift district and backward flow mud air-lift district in biochemical treatment unit, and realize the backward flow of nitrifying liquid and activated sludge respectively through backward flow waste water air-lift device and backward flow mud air-lift device, can realize the big ratio on the low energy consumption basis and double the backward flow, the treatment effect to breeding waste water has further been improved, and biochemical treatment unit does not relate to the anaerobic treatment process, the processing flow of this breed effluent treatment system has been simplified and the stability of breeding effluent treatment system operation has been improved.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a system for treating aquaculture wastewater provided by the present invention;

FIG. 2 is a second flow chart of the system for treating aquaculture wastewater provided by the present invention;

FIG. 3 is a flow chart of a biochemical treatment unit provided by the present invention;

FIG. 4 is a schematic view of the structure of a biochemical treatment tank provided by the present invention;

FIG. 5 is a position relationship diagram of the first stripping zone, the first anoxic zone and the first aeration zone provided by the present invention;

reference numerals:

1: a pre-processing unit; 2: a BioDopp biochemical unit; 3: a depth processing unit;

4: a pasteur metering tank; 11: a water collecting tank; 12: a hydraulic screen;

13: a primary sedimentation tank; 14: an air flotation unit; 15: a sludge storage tank;

20: a biochemical treatment tank; 21: a first anoxic zone; 22: a first aeration zone;

23: a first stripping zone; 24: a second anoxic zone; 25: a second aeration zone;

26: a second stripping zone; 27: a settling zone; 28: a return sludge gas stripping zone;

231: an exhaust assembly; 232: an air duct; 233: a second lifting device;

31: a coagulating sedimentation unit; 32: and (4) sterilizing and decoloring units.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

The cultivation wastewater treatment system of the present invention will be described with reference to fig. 1 to 5.

As shown in fig. 1, the utility model provides a cultivation wastewater treatment system, which comprises a pretreatment unit 1, a biochemical treatment unit and a deep treatment unit 3, wherein the pretreatment unit 1 is used for filtering cultivation wastewater to remove solid matters in the cultivation wastewater; the biochemical treatment unit is used for decomposing organic matters and certain inorganic poisons in the filtered aquaculture wastewater, and the advanced treatment unit 3 is used for carrying out decoloration and disinfection treatment on the water body treated by the biochemical treatment unit. The water body of the aquaculture wastewater treated by the pretreatment unit 1, the biochemical treatment unit and the advanced treatment unit 3 can reach the discharge standard.

The biochemical treatment unit comprises N reaction zones and a precipitation zone 27, a water inlet of the first reaction zone is communicated with a water outlet of the pretreatment unit 1, the N reaction zones are sequentially communicated, a water outlet of the Nth reaction zone is communicated with a water inlet of the precipitation zone 27, and a water outlet of the precipitation zone 27 is communicated with the deep treatment unit 3. Thus, the aquaculture wastewater treated by the pretreatment unit 1 sequentially passes through the N reaction zones and the sedimentation zone 27 and then enters the advanced treatment unit 3.

Here, N is 1 or more, that is, the biochemical treatment unit may include one reaction region or may include a plurality of reaction regions.

And the biochemical treatment unit also comprises a return sludge gas-stripping area 28, the inlet of the return sludge gas-stripping area 28 is communicated with the sludge return port of the sedimentation area 27, the outlet of the return sludge gas-stripping area 28 is communicated with one or more of the N reaction areas, so that the return sludge can enter one reaction area or a plurality of reaction areas, and the activated sludge microorganisms enter the reaction areas, thereby improving the treatment effect of the biochemical treatment unit on the aquaculture wastewater.

In addition, the reaction zone comprises an anoxic zone and an aeration zone, and a water inlet of the aeration zone is communicated with a water outlet of the anoxic zone. The organic carbon of the aquaculture wastewater in the anoxic zone can be utilized by denitrifying bacteria in the aquaculture wastewater, so that the organic load of a subsequent aeration zone can be reduced, and the alkalinity generated by denitrification reaction can compensate the alkalinity requirement of nitrification reaction in the aeration zone; the aeration zone is arranged behind the anoxic zone, so that the organic pollutants remained in denitrification can be further removed, and the effluent quality is improved.

And the reaction zone also comprises a reflux waste water gas stripping zone, a water inlet of the reflux waste water gas stripping zone is communicated with the aeration zone, and a water outlet of the reflux waste water gas stripping zone is communicated with the anoxic zone. In addition, a backflow wastewater air stripping device is arranged in the backflow wastewater air stripping area, and the culture wastewater in the aeration area can partially flow back to the anoxic area through the backflow wastewater air stripping device, so that the nitrifying liquid in the aeration area flows back to the anoxic area.

Here, the biochemical treatment unit may be a BioDopp biochemical unit 2, which can reduce chemical oxygen demand (CODcr) in the aquaculture wastewater and remove pollutants such as ammonia nitrogen, total phosphorus, and the like in the aquaculture wastewater.

According to the arrangement, the aquaculture wastewater is sequentially treated through the pretreatment unit 1, the biochemical treatment unit and the advanced treatment unit 3, so that the treated water body can reach the discharge standard, the air stripping area is arranged in the biochemical treatment unit, the reflux of the nitrification liquid and the activated sludge is realized through the air stripping device, the reflux of large specific times can be realized on the basis of low energy consumption, the treatment effect on the aquaculture wastewater is further improved, the biochemical treatment unit does not relate to an anaerobic treatment process, the treatment flow of the aquaculture wastewater treatment system is simplified, and the running stability of the aquaculture wastewater treatment system is improved.

In an optional embodiment of the present invention, the biochemical treatment unit comprises a biochemical treatment tank 20, and the N reaction zones, the settling zone 27 and the return sludge stripping zone 28 are all located in the biochemical treatment tank 20. Like this, N reaction zone, settling zone 27 and return sludge air stripping district 28 set up in the integration pond, are favorable to reducing biochemical treatment unit's area, save the land used.

It is noted that alkali liquor can be added according to actual needs in the treatment process of the aquaculture wastewater by the biochemical treatment unit.

In an alternative embodiment, the N reaction zones comprise a first reaction zone and a second reaction zone, i.e. N equals 2. Wherein, the water inlet of the first reaction zone is communicated with the water outlet of the pretreatment unit 1, the water inlet of the second reaction zone is communicated with the water outlet of the first reaction zone, the water outlet of the second reaction zone is communicated with the water inlet of the sedimentation zone 27, and the outlet of the return sludge gas-stripping zone 28 is communicated with the first reaction zone and/or the second reaction zone. Therefore, the aquaculture wastewater can be biochemically treated twice in the biochemical treatment unit.

In this embodiment, the first reaction zone and the second reaction zone may be disposed side by side in the biochemical treatment tank 20, and the precipitation zone 27 may be located at one end of the first reaction zone and the second reaction zone, as shown in FIG. 2. Therefore, the occupied area of the biochemical reaction tank is favorably reduced.

Here, the anoxic zone of the first reaction zone may be the first anoxic zone 21, the aeration zone of the first reaction zone may be the first aeration zone 22, and the reflux wastewater stripping zone of the first reaction zone may be the first stripping zone 23; the anoxic zone of the second reaction zone may be a second anoxic zone 24, the aerated zone of the second reaction zone may be a second aerated zone 25, and the reflux wastewater stripping zone of the second reaction zone may be a second stripping zone 26.

Specifically, the water inlet of the first anoxic zone 21 is communicated with the water outlet of the pretreatment unit 1, the water inlet of the first aeration zone 22 is communicated with the water outlet of the first anoxic zone 21, the water inlet of the second anoxic zone 24 is communicated with the water outlet of the first aeration zone 22, the water inlet of the second aeration zone 25 is communicated with the water outlet of the second anoxic zone 24, and the water outlet of the second aeration zone 25 is communicated with the water inlet of the sedimentation zone 27.

In this embodiment, the outlet of the return sludge stripping zone 28 may be in communication with the first anoxic zone 21 and/or the first aeration zone 22, and/or the outlet of the return sludge stripping zone 28 may be in communication with the second anoxic zone 24 and/or the second aeration zone 25.

Here, the outlet of the return sludge stripping zone 28 may be in communication with the second anoxic zone 24 and the second aeration zone 25.

In an optional embodiment, an aeration device and a first lifting device are arranged in the aeration area, the first lifting device is used for lifting the aeration device, and the first lifting device is connected with the top end of the wall of the biochemical treatment tank 20, so that an operator can lift the aeration device out of the water surface through the first lifting device, the aeration device can be conveniently overhauled or replaced, the aeration device can be overhauled or replaced in a state that the biochemical treatment unit is not stopped (namely, is not stopped), and the running stability of the biochemical treatment unit can be ensured.

In this embodiment, the aeration device may include a plurality of aeration pipes connected to the gas supply device, and the plurality of aeration pipes are located in the water body to aerate the water body.

The first lifting device comprises at least one lifting chain, one end of the lifting chain is connected with the top end of the wall of the biochemical treatment tank 20, and the other end of the lifting chain is connected with the aeration pipe. Like this, when operating personnel need overhauld the aeration pipe or change, can promote the lifting chain to realize the promotion of aeration pipe.

In other embodiments, first hoisting device can include many lifting chains, and many lifting chains are connected with many aeration pipes one by one, when one of them aeration pipe damaged, only need promote with the lifting chain of this aeration union coupling can go out the surface of water with the aeration pipe that damages and maintain or change, do not influence the normal aeration of other aeration pipes, further realized not stopping the change.

The utility model discloses an optional embodiment, as shown in fig. 5, backward flow waste water air-lift device can be including the exhaust subassembly 231 that is located the aquatic and the air conduit 232 that is used for being connected with air feeder, and air conduit 232 communicates with exhaust subassembly 231, for exhaust subassembly 231 air feed, is provided with a plurality of gas vents on the exhaust subassembly 231, and the gas vent sets up to make the air discharge up, thereby realize the promotion of water, be convenient for realize breeding the backward flow of waste water. Here, the exhaust assembly 231 may be composed of a plurality of exhaust pipes.

In an optional embodiment, a water inlet of the reflux wastewater air-stripping zone is arranged close to the bottom end of the reflux wastewater air-stripping zone, and a water outlet of the reflux wastewater air-stripping zone is arranged close to the top end of the reflux wastewater air-stripping zone, so that the wastewater flowing back from the aeration zone can be lifted, and the reflux wastewater can enter the anoxic zone conveniently.

In an optional embodiment, a second lifting device 233 is disposed in the reflux wastewater stripping zone, and the second lifting device 233 is used for lifting the reflux wastewater stripping device, so that an operator can repair or replace the reflux wastewater stripping device.

Here, the second lifting means 233 may be a lifting chain, the top end of which is connected to the top end of the wall of the biochemical treatment tank 20, and the bottom end of which is connected to the exhaust unit 231 or the air pipe 232.

The utility model discloses an in the optional embodiment, backward flow mud air-lift device also can be including the air conduit who is arranged in the exhaust subassembly of mud and is used for being connected with air feeder, air conduit and exhaust subassembly intercommunication for the exhaust subassembly air feed is provided with a plurality of gas vents on the exhaust subassembly, and the gas vent sets up to make the air discharge up, thereby realize the promotion of mud, be convenient for realize activated sludge's backward flow.

And, the import in return sludge air-lift district 28 is close to the bottom in return sludge air-lift district 28 and sets up, and the export in return sludge air-lift district 28 is close to the top in return sludge air-lift district 28 and sets up, and in addition, the mud backward flow mouth in the settling zone 27 is close to the bottom of sedimentation tank and sets up to in the mud backward flow reaches return sludge air-lift district 28, be convenient for realize from the promotion of return sludge, thereby be convenient for return sludge to get into in the second aeration district 25.

In addition, the outlet of the return sludge stripping zone 28 may also be connected to the second anoxic zone 24, so that part of the return sludge enters the second anoxic zone 24, thereby improving the treatment effect on the aquaculture wastewater.

In an alternative embodiment, a third lifting device is disposed in the return sludge stripping zone 28, and the third lifting device is used for lifting the return sludge stripping device, so that an operator can repair or replace the return sludge stripping device. Here, the third lifting means may be a lifting chain, the top end of which is connected to the top end of the wall of the biochemical treatment tank 20, and the bottom end of which is connected to the exhaust assembly or the air duct.

In other embodiments, the return sludge stripping device may also be a conventional stripping sludge discharging device, and the specific structure of the stripping sludge discharging device is not limited herein.

In this embodiment, the sedimentation zone may be an inclined plate sedimentation tank, a rectangular sedimentation tank or a vertical flow sedimentation tank; also, an agitator, which may be a vertical agitator, may be provided in the anoxic zone.

In the optional embodiment of the utility model, the pretreatment unit 1 comprises a collecting tank 11 and a filtering unit, the collecting tank 11 is used for collecting cultivation wastewater, and the water inlet of the filtering unit is communicated with the water outlet of the collecting tank 11, so that the cultivation wastewater flows into the filtering unit, thereby the filtering unit filters the cultivation wastewater, and the solid (dregs) in the cultivation wastewater is filtered. The water outlet of the filtering unit is communicated with the water inlet of the first reaction area, so that the filtered aquaculture wastewater can enter the biochemical treatment unit.

In an alternative embodiment, the filtering unit comprises a hydraulic sieve 12, a primary sedimentation tank 13 and an air flotation unit 14, wherein a water inlet of the hydraulic sieve 12 is communicated with a water outlet of the water collecting tank 11, a water inlet of the primary sedimentation tank 13 is communicated with a water outlet of the hydraulic sieve 12, a water inlet of the air flotation unit 14 is communicated with a water outlet of the primary sedimentation tank 13, and a water outlet of the air flotation unit 14 is communicated with a water inlet of the first reaction zone.

And a water pump is arranged between the water collecting tank 11 and the hydraulic sieve 12, so that the breeding wastewater in the water collecting tank 11 can enter the hydraulic sieve 12 conveniently.

The culture wastewater in the water collecting tank 11 is pumped into the hydraulic sieve 12 by the water pump, large-particle-size substances such as manure residues, food residues and the like in the culture wastewater are filtered and separated by the hydraulic sieve 12, then the culture wastewater filtered by the hydraulic sieve 12 automatically flows into the primary sedimentation tank 13 to realize the separation of water bodies and heavy substances, the water bodies continuously enter the air flotation unit 14, and the air flotation unit 14 removes fine scum in the water bodies to assist in subsequent phosphorus removal.

In this embodiment, the pretreatment unit 1 further includes a sludge storage tank 15, and an inlet of the sludge storage tank 15 is communicated with a solid outlet of the hydraulic screen 12, a sludge outlet of the primary sedimentation tank 13 and a solid outlet of the air flotation unit 14, so as to collect solid residues and the like in the aquaculture wastewater and facilitate subsequent fertilizer production.

In an alternative embodiment of the present invention, the advanced treatment unit 3 comprises a coagulating sedimentation unit 31 and a sterilizing and decoloring unit 32.

Wherein, the water inlet of the coagulation sedimentation unit 31 is communicated with the water outlet of the sedimentation zone 27, and the coagulation sedimentation unit 31 is provided with a coagulation medicine feeding port for a coagulant to enter, thereby improving the dephosphorization rate and the removal rate of suspended solids.

Here, the coagulant may be lime or polyaluminium chloride (PAC).

The water inlet of the disinfection and decoloration unit 32 is communicated with the water outlet of the coagulating sedimentation unit 31, and the disinfection and decoloration unit 32 is provided with a medicine adding port for the disinfection and decoloration agent to enter, thereby disinfecting and decoloring the water body.

Here, the sterilizing and discoloring agent may be sodium hypochlorite.

In an optional embodiment, the aquaculture wastewater treatment system further comprises a pasteurization tank 4, and the pasteurization tank 4 is arranged at the water outlet of the disinfection and decoloration unit 32. In this way, the treated waste water can be metered out via the pasteurisation tank 4.

The above-described embodiments of the apparatus are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a breed effluent disposal system, its characterized in that includes pretreatment unit, biochemical treatment unit and advanced treatment unit, pretreatment unit is used for filtering breed waste water, advanced treatment unit is used for right the water after biochemical treatment unit handles carries out decoloration disinfection, biochemical treatment unit includes:

2. The aquaculture wastewater treatment system of claim 1 wherein the biochemical treatment unit comprises a biochemical treatment tank, and the N reaction zones, the settling zone, and the return sludge stripping zone are located in the biochemical treatment tank.

3. The aquaculture wastewater treatment system according to claim 2, wherein the N reaction zones comprise a first reaction zone and a second reaction zone, a water inlet of the first reaction zone is communicated with a water outlet of the pretreatment unit, a water inlet of the second reaction zone is communicated with a water outlet of the first reaction zone, a water outlet of the second reaction zone is communicated with a water inlet of the sedimentation zone, and an outlet of the return sludge air-stripping zone is communicated with the first reaction zone and/or the second reaction zone.

4. The aquaculture wastewater treatment system according to claim 2, wherein an aeration device and a first lifting device for lifting the aeration device are arranged in the aeration zone, and the first lifting device is connected with the top end of the wall of the biochemical treatment tank.

5. The aquaculture wastewater treatment system of claim 2 wherein the return wastewater stripping apparatus comprises:

the air pipeline is used for being connected with the air supply device;

6. The aquaculture wastewater treatment system of claim 5 wherein the inlet of the refluxed wastewater air stripping zone is disposed proximate to the bottom end of the refluxed wastewater air stripping zone and the outlet of the refluxed wastewater air stripping zone is disposed proximate to the top end of the refluxed wastewater air stripping zone.

7. The aquaculture wastewater treatment system of claim 5, wherein a second lifting device for lifting the reflux wastewater air-lifting device is arranged in the reflux wastewater air-lifting zone, and the second lifting device is connected with the top end of the wall of the biochemical treatment tank.

8. The aquaculture wastewater treatment system of claim 3 wherein the pretreatment unit comprises:

the water collecting tank is used for collecting the breeding wastewater;

9. The aquaculture wastewater treatment system of claim 8 wherein the filtration unit comprises:

10. The aquaculture wastewater treatment system of claim 1 wherein the advanced treatment unit comprises:

and the water inlet of the disinfection and decoloration unit is communicated with the water outlet of the coagulating sedimentation unit, and the disinfection and decoloration unit is provided with a medicine adding port for the disinfection and decoloration medicine to enter.