Integrated breeding sewage treatment device and process

Abstract

The invention discloses an integrated breeding sewage treatment device and process. The device comprises a first-stage nitrification reactor, a first-stage nitrification sludge interception tank, a first-stage denitrification reactor, a first-stage denitrification sludge interception tank, a second-stage nitrification reactor, a second-stage nitrification sludge interception tank, a second-stage denitrification reactor, a second-stage denitrification sludge interception tank, a coagulation reactor, a flocculation reactor, a final sedimentation tank and a disinfection tank which are connected in sequence. According to the device and the process, multifunctional efficient treatment and low-power-consumption operation of the aquaculture sewage can be realized, and the stability of the effluent quality can be effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aquaculture wastewater treatment, and in particular to an integrated aquaculture wastewater treatment device and process integrating nitrification, denitrification, COD degradation, phosphorus removal, decolorization and disinfection functions. BACKGROUND

[0002] At present, the traditional wastewater treatment system is difficult to treat high-COD and high-ammonia-nitrogen organic wastewater from a breeding farm due to simple function and low reaction efficiency, and is prone to unstable effluent quality, which is difficult to meet the strict standards of both the Discharge Standard of Pollutants for Livestock and Poultry Breeding (GB 18596-2001) and the Standard for Irrigation Water Quality (GB 5084-2021). Therefore, how to design an integrated treatment device and process capable of realizing efficient treatment of aquaculture wastewater, low-power operation and effective guarantee of stable effluent quality has become a technical problem to be solved in the field. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide an integrated aquaculture wastewater treatment device and an integrated aquaculture wastewater treatment process based on the integrated aquaculture wastewater treatment device, which can realize multifunctional efficient treatment of aquaculture wastewater, low-power operation and effective guarantee of stable effluent quality.

[0004] The integrated aquaculture wastewater treatment device of the present application is realized by adopting the following technical scheme: The integrated aquaculture wastewater treatment device comprises a primary nitrification reactor, a primary nitrification sludge interception tank, a primary denitrification reactor, a primary denitrification sludge interception tank, a secondary nitrification reactor, a secondary nitrification sludge interception tank, a secondary denitrification reactor, a secondary denitrification sludge interception tank, a coagulation reactor, a flocculation reactor, a final sedimentation tank and a disinfection tank connected in sequence. Each of the primary nitrification reactor and the secondary nitrification reactor is cultured with nitrification-specific sludge, and each of the primary nitrification reactor and the secondary nitrification reactor is provided with an aeration system. Each of the primary denitrification reactor and the secondary denitrification reactor is cultured with denitrification-specific sludge, and each of the primary denitrification reactor and the secondary denitrification reactor is provided with a micro-oxygen supply system. The coagulation reactor is used for adding ferrous iron and lime, the flocculation reactor is used for adding PAM, and the disinfection tank is used for adding a disinfectant. The primary nitrification sludge interception tank is used for sludge interception and dissolved oxygen consumption of the effluent of the primary nitrification reactor. The primary nitrification sludge interception tank is connected with a primary nitrification sludge discharge facility, the primary nitrification sludge discharge facility is connected with a primary nitrification sludge backflow facility, and the primary nitrification sludge backflow facility is connected with the primary nitrification reactor. The primary denitrification sludge interception tank is used for sludge interception of effluent of the primary denitrification reactor, and is connected with a primary denitrification sludge discharge facility, which is connected with a primary denitrification sludge reflux facility, which is connected with the primary denitrification reactor. The secondary nitrification sludge interception tank is used for sludge interception and dissolved oxygen consumption of effluent of the secondary nitrification reactor, and is connected with a secondary nitrification sludge discharge facility, which is connected with a secondary nitrification sludge reflux facility, which is connected with the secondary nitrification reactor. The secondary denitrification sludge interception tank is used for sludge interception of effluent of the secondary denitrification reactor, and is connected with a secondary denitrification sludge discharge facility, which is connected with a secondary denitrification sludge reflux facility, which is connected with the secondary denitrification reactor.

[0005] Further, the nitrification-specific sludge refers to sludge in which the proportion of nitrifying bacteria in the microbial community is greater than 90%; and the denitrification-specific sludge refers to sludge in which the proportion of denitrifying bacteria in the microbial community is greater than 90%.

[0006] Further, the integrated aquaculture wastewater treatment device further comprises a sludge recovery tank, and the primary nitrification sludge discharge facility, the primary denitrification sludge discharge facility, the secondary nitrification sludge discharge facility, and the secondary denitrification sludge discharge facility are all connected with the sludge recovery tank, and the sludge recovery tank is connected with a sludge treatment system.

[0007] Further, the coagulation reactor is connected with a coagulation reactor sludge discharge facility, the coagulation reactor sludge discharge facility is connected with the sludge recovery tank, the flocculation reactor is connected with a flocculation reactor sludge discharge facility, the flocculation reactor sludge discharge facility is connected with the sludge recovery tank, and the final sedimentation tank is connected with a final sedimentation tank sludge discharge facility, and the final sedimentation tank sludge discharge facility is connected with the sludge recovery facility.

[0008] Further, the primary nitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank, the primary denitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank, the secondary nitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank, and the secondary denitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank.

[0009] Further, the final sedimentation tank adopts a vertical flow sedimentation tank.

[0010] Further, the aeration system adopts multiple layers of aeration devices, and each layer of aeration device is independently provided with an aeration fan; or the aeration system is a pure oxygen supply system.

[0011] The integrated aquaculture sewage treatment process of the present application is implemented by using the following technical scheme: The integrated aquaculture sewage treatment process is implemented by using the integrated aquaculture sewage treatment device, and the integrated aquaculture sewage treatment process comprises the following steps: The pretreatment step: after the aquaculture sewage is subjected to solid-liquid separation and anaerobic treatment, it is flowed into the integrated aquaculture sewage treatment device for treatment, and the water quality of the integrated aquaculture sewage treatment device is controlled to meet the conditions of COD < 5000 mg / L, SS < 1000 mg / L, C / T K N < 3 and pH value of 7-8; The first-stage nitrification step: the sewage is flowed into the first-stage nitrification reactor for nitrification reaction, the effluent of the first-stage nitrification reactor is subjected to sludge interception and dissolved oxygen consumption by the first-stage nitrification sludge interception tank, the sludge intercepted by the first-stage nitrification sludge interception tank is backflowed to the first-stage nitrification reactor, and the sludge backflow multiple is 3-5 times; The first-stage denitrification step: the effluent of the first-stage nitrification sludge interception tank is flowed into the first-stage denitrification reactor for denitrification reaction, the effluent of the first-stage denitrification reactor is subjected to sludge interception by the first-stage denitrification sludge interception tank, the sludge intercepted by the first-stage denitrification sludge interception tank is backflowed to the first-stage denitrification reactor, and the sludge backflow multiple is 1-5 times; The second-stage nitrification step: the effluent of the first-stage denitrification sludge interception tank is flowed into the second-stage nitrification reactor for nitrification reaction, the effluent of the second-stage nitrification reactor is subjected to sludge interception and dissolved oxygen consumption by the second-stage nitrification sludge interception tank, the sludge intercepted by the second-stage nitrification sludge interception tank is backflowed to the second-stage nitrification reactor, and the sludge backflow multiple is 3-5 times; The second-stage denitrification step: the effluent of the second-stage nitrification sludge interception tank is flowed into the second-stage denitrification reactor for denitrification reaction, the effluent of the second-stage denitrification reactor is subjected to sludge interception by the second-stage denitrification sludge interception tank, the sludge intercepted by the second-stage denitrification sludge interception tank is backflowed to the second-stage denitrification reactor, and the sludge backflow multiple is 1-5 times; The final treatment step: the effluent of the second-stage denitrification sludge interception tank is sequentially treated by the coagulation reactor, the flocculation reactor, the final sedimentation tank and the disinfection tank, ferrous iron and lime are added in the coagulation reactor, PAM is added in the flocculation reactor, and a disinfectant is added in the disinfection tank, so as to realize the functions of turbidity removal, large-molecule organic matter sedimentation, decolorization, chemical phosphorus removal and disinfection.

[0012] Further, in the first-stage nitrification step, the first-stage nitrification reactor performs nitrification reaction according to the following operation parameters: The reaction temperature is 15°C-40°C, the dissolved oxygen concentration is 4-8 mg / L, the pH value is greater than or equal to 7.0, the sludge concentration is 10000-20000 mg / L, and the sludge age is 12-22 d; In the primary denitrification step, the primary denitrification reactor carries out denitrification reaction according to the following operation parameters: The reaction temperature is 15°C-35°C, the dissolved oxygen concentration is 0.2-0.6 mg / L, the pH value is 6.5-8.0, the sludge concentration is 5000-15000 mg / L, and the sludge age is 8-18 d; In the secondary nitrification step, the secondary nitrification reactor carries out nitrification reaction according to the following operation parameters: The reaction temperature is 15°C-40°C, the dissolved oxygen concentration is 4-8 mg / L, the pH value is greater than or equal to 7.0, the sludge concentration is 5000-10000 mg / L, and the sludge age is 15-25 d; In the secondary denitrification step, the secondary denitrification reactor carries out denitrification reaction according to the following operation parameters: The reaction temperature is 15°C-35°C, the dissolved oxygen concentration is 0.2-0.6 mg / L, the pH value is 6.5-8.0, the sludge concentration is 3000-6000 mg / L, and the sludge age is 18-28 d.

[0013] Further, in the primary nitrification step and the secondary nitrification step, when the pH value is less than 7.0, the alkalinity is increased by means of exogenous alkali supplement; in the primary denitrification step and the secondary denitrification step, the carbon source is supplemented by means of exogenous carbon supplement.

[0014] Compared with the prior art, the application has the beneficial effects that: The integrated aquaculture wastewater treatment device and process provided by the application integrates nitrification, denitrification, turbidity removal, macromolecular organic matter sedimentation, decolorization, chemical phosphorus removal and disinfection functions, and can realize multifunctional efficient treatment of aquaculture wastewater, low-power-consumption operation and effective guarantee of stable effluent water quality. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 Fig. 1 is a structural schematic view of an integrated aquaculture wastewater treatment device according to an embodiment of the application; Fig. 2 Fig. 2 is a partial structural schematic view of the integrated aquaculture wastewater treatment device according to the embodiment of the application; Fig. 3 Fig. 3 is a flow chart of an integrated aquaculture wastewater treatment process according to an embodiment of the application.

[0016] In the drawings: 1, primary nitrification reactor; 2, primary nitrification sludge interception tank; 3, primary denitrification reactor; 4, primary denitrification sludge interception tank; 5, secondary nitrification reactor; 6, secondary nitrification sludge interception tank; 7, secondary denitrification reactor; 8, secondary denitrification sludge interception tank; 9, coagulation reactor; 10, flocculation reactor; 11, final sedimentation tank; 12, disinfection tank; 13, sludge recovery tank. Detailed Implementation

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0018] refer to Figs. 1-3 This invention provides an integrated aquaculture wastewater treatment device and an integrated aquaculture wastewater treatment process implemented using the integrated aquaculture wastewater treatment device.

[0019] The integrated aquaculture wastewater treatment device of this invention includes a primary nitrification reactor 1, a primary nitrification sludge interception tank 2, a primary denitrification reactor 3, a primary denitrification sludge interception tank 4, a secondary nitrification reactor 5, a secondary nitrification sludge interception tank 6, a secondary denitrification reactor 7, a secondary denitrification sludge interception tank 8, a coagulation reactor 9, a flocculation reactor 10, a final sedimentation tank 11, and a disinfection tank 12, connected in sequence.

[0020] The primary nitrification reactor 1 and the secondary nitrification reactor 5 each cultivate nitrification-specific sludge, and each of the primary nitrification reactor 1 and the secondary nitrification reactor 5 is equipped with an aeration system. The primary denitrification reactor 3 and the secondary denitrification reactor 7 each cultivate denitrification-specific sludge, and each of the primary denitrification reactor 3 and the secondary denitrification reactor 7 is equipped with a micro-aerobic supply system. The coagulation reactor 9 is used to add ferrous iron and lime, the flocculation reactor 10 is used to add PAM, and the disinfection tank 11 is used to add disinfectant.

[0021] The primary nitrification sludge interception tank 2 is used to intercept sludge and consume dissolved oxygen in the effluent of the primary nitrification reactor 1. The primary nitrification sludge interception tank 2 is connected to the primary nitrification sludge discharge facility, which is connected to the primary nitrification sludge return facility, which is connected to the primary nitrification reactor.

[0022] The primary denitrification sludge interception tank 4 is used to intercept sludge from the effluent of the primary denitrification reactor 3. The primary denitrification sludge interception tank 4 is connected to the primary denitrification sludge discharge facility, which is connected to the primary denitrification sludge return facility. The primary denitrification sludge return facility is connected to the primary denitrification reactor 3.

[0023] The secondary nitrification sludge interception tank 6 is used to intercept sludge and consume dissolved oxygen in the effluent of the secondary nitrification reactor 5. The secondary nitrification sludge interception tank 6 is connected to the secondary nitrification sludge discharge facility, which is connected to the secondary nitrification sludge return facility, which is connected to the secondary nitrification reactor 5.

[0024] The secondary denitrification sludge interception tank 8 is used to intercept sludge from the effluent of the secondary denitrification reactor 7. The secondary denitrification sludge interception tank 8 is connected to the secondary denitrification sludge discharge facility, which is connected to the secondary denitrification sludge return facility. The secondary denitrification sludge return facility is connected to the secondary denitrification reactor 7.

[0025] In the fox-killing method of this invention, sludge discharge facilities refer to equipment such as relevant sludge discharge pipelines and sludge discharge pumps; for example, see reference... Fig. 2 In the diagram, 2a represents the primary nitrification sludge discharge facility, and 2b represents the primary nitrification sludge return facility. The sludge discharge or return facilities of other units are understood in the same way.

[0026] In this embodiment of the invention, the nitrification-specific sludge refers to sludge in which the proportion of nitrifying bacteria in the relative microbial community is greater than 90%; the denitrification-specific sludge refers to sludge in which the proportion of denitrifying bacteria in the relative microbial community is greater than 90%.

[0027] The integrated aquaculture wastewater treatment device of this invention also includes a sludge recovery tank 13. The primary nitrification sludge discharge facility, the primary denitrification sludge discharge facility, the secondary nitrification sludge discharge facility, and the secondary denitrification sludge discharge facility are all connected to the sludge recovery tank 13. The sludge recovery tank 13 is connected to the sludge treatment system.

[0028] In the integrated aquaculture wastewater treatment device of this invention embodiment, the coagulation reactor 9 is connected to the coagulation reactor sludge discharge facility, which is connected to the sludge recovery tank 13; the flocculation reactor 10 is connected to the flocculation reactor sludge discharge facility, which is connected to the sludge recovery tank 13; and the final sedimentation tank 11 is connected to the final sedimentation tank sludge discharge facility, which is connected to the sludge recovery facility 13.

[0029] In the integrated aquaculture wastewater treatment device of this invention embodiment, the primary nitrification sludge interception tank 2 can be an inclined tube sedimentation tank or a vertical flow sedimentation tank, the primary denitrification sludge interception tank 4 can be an inclined tube sedimentation tank or a vertical flow sedimentation tank, the secondary nitrification sludge interception tank 6 can be an inclined tube sedimentation tank or a vertical flow sedimentation tank, the secondary denitrification sludge interception tank 8 can be an inclined tube sedimentation tank or a vertical flow sedimentation tank, and the final sedimentation tank 11 can be a vertical flow sedimentation tank.

[0030] In the integrated aquaculture wastewater treatment device of this invention embodiment, the aeration system for the primary nitrification reactor 1 and the secondary nitrification reactor 5 adopts a multi-layer aeration device, with each layer of aeration device independently equipped with an aeration blower; or, the aeration system is a pure oxygen supply system.

[0031] The embodiment of the present application also provides an integrated aquaculture sewage treatment process, which is realized by using the integrated aquaculture sewage treatment device, and comprises the following steps S1-S6.

[0032] S1, a pretreatment step: after the aquaculture sewage is subjected to solid-liquid separation and anaerobic treatment, the aquaculture sewage is flowed into the integrated aquaculture sewage treatment device for treatment, and the water quality of the integrated aquaculture sewage treatment device is controlled to meet the conditions of COD < 5000 mg / L, SS < 1000 mg / L, C / T K N < 3 and pH value of 7-8.

[0033] S2, a primary nitrification step: the sewage is flowed into a primary nitrification reactor for nitrification reaction, sludge interception and dissolved oxygen consumption of the effluent of the primary nitrification reactor are performed by a primary nitrification sludge interception tank, and the sludge intercepted by the primary nitrification sludge interception tank is flowed back to the primary nitrification reactor, and the sludge reflux ratio is 3-5 times. S3, a primary denitrification step: the effluent of the primary nitrification sludge interception tank is flowed into a primary denitrification reactor for denitrification reaction, sludge interception of the effluent of the primary denitrification reactor is performed by a primary denitrification sludge interception tank, the sludge intercepted by the primary denitrification sludge interception tank is flowed back to the primary denitrification reactor, and the sludge reflux ratio is 1-5 times.

[0034] S4, a secondary nitrification step: the effluent of the primary denitrification sludge interception tank is flowed into a secondary nitrification reactor for nitrification reaction, sludge interception and dissolved oxygen consumption of the effluent of the secondary nitrification reactor are performed by a secondary nitrification sludge interception tank, and the sludge intercepted by the secondary nitrification sludge interception tank is flowed back to the secondary nitrification reactor, and the sludge reflux ratio is 3-5 times.

[0035] S5, a secondary denitrification step: the effluent of the secondary nitrification sludge interception tank is flowed into a secondary denitrification reactor for denitrification reaction, sludge interception of the effluent of the secondary denitrification reactor is performed by a secondary denitrification sludge interception tank, the sludge intercepted by the secondary denitrification sludge interception tank is flowed back to the secondary denitrification reactor, and the sludge reflux ratio is 1-5 times.

[0036] S6, a final treatment step: the effluent of the secondary denitrification sludge interception tank is sequentially treated by a coagulation reactor, a flocculation reactor, a final sedimentation tank and a disinfection tank, ferrous and lime are added in the coagulation reactor, PAM is added in the flocculation reactor, and a disinfectant is added in the disinfection tank, so as to realize the functions of turbidity removal, macromolecular organic matter sedimentation, decolorization, chemical phosphorus removal and disinfection.

[0037] In the S1, the primary nitrification step, the primary nitrification reactor performs nitrification reaction according to the following operation parameters: The reaction temperature is 15-40 DEG C, the dissolved oxygen concentration is 4-8 mg / L, the pH value is greater than or equal to 7.0, the sludge concentration is 10000-20000 mg / L, and the sludge age is 12-22 d.

[0038] In the S3, the primary denitrification step, the primary denitrification reactor carries out the denitrification reaction according to the following operation parameters: The reaction temperature is 15-35 DEG C, the dissolved oxygen concentration is 0.2-0.6 mg / L, the pH value is 6.5-8.0, the sludge concentration is 5000-15000 mg / L, and the sludge age is 8-18 d.

[0039] In the S4, the secondary nitrification step, the secondary nitrification reactor carries out the nitrification reaction according to the following operation parameters: The reaction temperature is 15-40 DEG C, the dissolved oxygen concentration is 4-8 mg / L, the pH value is greater than or equal to 7.0, the sludge concentration is 5000-10000 mg / L, and the sludge age is 15-25 d.

[0040] In the S5, the secondary denitrification step, the secondary denitrification reactor carries out the denitrification reaction according to the following operation parameters: The reaction temperature is 15-35 DEG C, the dissolved oxygen concentration is 0.2-0.6 mg / L, the pH value is 6.5-8.0, the sludge concentration is 3000-6000 mg / L, and the sludge age is 18-28 d.

[0041] In addition, in the primary nitrification step and the secondary nitrification step, when the pH value is less than 7.0, the alkalinity can be increased by adding alkali from outside; in the primary denitrification step and the secondary denitrification step, the carbon source can be supplemented by adding carbon from outside.

[0042] In the traditional A / A / O sewage treatment process (anaerobic-anoxic-aerobic), the treatment of high-nitrogen ammonia sewage relies on high reflux of nitrification liquid, which leads to high energy consumption, and the high reflux of nitrification liquid inevitably affects the effective guarantee of the anoxic condition. However, in the integrated aquaculture sewage treatment device and process of the embodiment of the application, the sewage flows in one direction without relying on high reflux of nitrification liquid, which can effectively save energy consumption; and the sludge interception tank is arranged between the nitrification reactor and the denitrification reactor, which plays a role in consuming dissolved oxygen, for example, by realizing solid-liquid separation through gravity sedimentation to intercept suspended sludge, and the microorganisms in the sludge layer at the bottom of the sludge interception tank (sedimentation tank) can consume a large amount of dissolved oxygen through endogenous respiration.

[0043] In the traditional A / A / O sewage treatment process (anaerobic-anoxic-oxygenic), the internal reflux and external reflux etc. can cause the sludge of anaerobic, anoxic and oxygenic units to be mixed together, causing the bacterial flora to be mixed, meaning that each reaction unit uses mixed sludge rather than exclusive sludge, which causes the reaction efficiency of each reaction unit to be low and to be easily interfered by other reactions, and the control of sludge age and sludge concentration is difficult. However, in the integrated aquaculture sewage treatment device and process of the embodiment of the present application, the rear end of each nitrification reactor or denitrification reactor is provided with a sludge interception tank, the sludge of the sludge interception tank is refluxed to the reactor to which it belongs, and in addition, there is no need for nitrification liquid reflux, so each nitrification reactor or denitrification reactor can use exclusive sludge, which can effectively improve the reaction efficiency, and facilitate the control of sludge age and sludge concentration.

[0044] The integrated aquaculture sewage treatment device and process of the embodiment of the present application integrates multiple functions such as nitrification, denitrification, turbidity removal, large-molecule organic matter sedimentation, decolorization, chemical phosphorus removal and disinfection, and the final effluent can be used for agricultural irrigation, and through two-stage nitrification and denitrification, the load can be effectively buffered, and the treatment efficiency and the stability of the effluent water quality can be ensured.

[0045] In summary, the integrated aquaculture sewage treatment device and process of the embodiment of the present application can realize multifunctional and efficient treatment of aquaculture sewage, low-power operation and effective guarantee of the stability of the effluent water quality.

[0046] The above-described embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application, and any non-substantial changes and replacements made by those skilled in the art on the basis of the present application all belong to the scope of protection required by the present application.

Claims

1. An integrated livestock wastewater treatment device, characterized in that, It includes a primary nitrification reactor, a primary nitrification sludge interception tank, a primary denitrification reactor, a primary denitrification sludge interception tank, a secondary nitrification reactor, a secondary nitrification sludge interception tank, a secondary denitrification reactor, a secondary denitrification sludge interception tank, a coagulation reactor, a flocculation reactor, a final sedimentation tank, and a disinfection tank, all connected in sequence. The primary nitrification reactor and the secondary nitrification reactor each cultivate nitrification-specific sludge, and each of the primary nitrification reactor and the secondary nitrification reactor is equipped with an aeration system. The primary denitrification reactor and the secondary denitrification reactor each cultivate denitrification-specific sludge, and each of the primary denitrification reactor and the secondary denitrification reactor is equipped with a micro-aerobic supply system. The coagulation reactor is used to add ferrous sulfate and lime, the flocculation reactor is used to add PAM, and the disinfection tank is used to add disinfectant. The primary nitrification sludge interception tank is used to intercept sludge and consume dissolved oxygen in the effluent of the primary nitrification reactor. The primary nitrification sludge interception tank is connected to a primary nitrification sludge discharge facility. The primary nitrification sludge discharge facility is connected to a primary nitrification sludge return facility. The primary nitrification sludge return facility is connected to the primary nitrification reactor. The primary denitrification sludge interception tank is used to intercept sludge from the effluent of the primary denitrification reactor. The primary denitrification sludge interception tank is connected to a primary denitrification sludge discharge facility. The primary denitrification sludge discharge facility is connected to a primary denitrification sludge return facility. The primary denitrification sludge return facility is connected to the primary denitrification reactor. The secondary nitrification sludge interception tank is used to intercept sludge and consume dissolved oxygen in the effluent of the secondary nitrification reactor. The secondary nitrification sludge interception tank is connected to a secondary nitrification sludge discharge facility. The secondary nitrification sludge discharge facility is connected to a secondary nitrification sludge return facility. The secondary nitrification sludge return facility is connected to the secondary nitrification reactor. The secondary denitrification sludge interception tank is used to intercept sludge from the effluent of the secondary denitrification reactor. The secondary denitrification sludge interception tank is connected to a secondary denitrification sludge discharge facility. The secondary denitrification sludge discharge facility is connected to a secondary denitrification sludge return facility. The secondary denitrification sludge return facility is connected to the secondary denitrification reactor.

2. The integrated aquaculture wastewater treatment device as described in claim 1, characterized in that, The nitrification-specific sludge refers to sludge in which the proportion of nitrifying bacteria in the microbial community is greater than 90%; the denitrification-specific sludge refers to sludge in which the proportion of denitrifying bacteria in the microbial community is greater than 90%.

3. The integrated aquaculture wastewater treatment device as described in claim 1, characterized in that, The integrated aquaculture wastewater treatment device also includes a sludge recovery tank. The primary nitrification sludge discharge facility, the primary denitrification sludge discharge facility, the secondary nitrification sludge discharge facility, and the secondary denitrification sludge discharge facility are all connected to the sludge recovery tank, which is connected to the sludge treatment system.

4. The integrated aquaculture wastewater treatment device as described in claim 3, characterized in that, The coagulation reactor is connected to a coagulation reactor sludge discharge facility, which is connected to a sludge recovery tank. The flocculation reactor is connected to a flocculation reactor sludge discharge facility, which is connected to a sludge recovery tank. The final sedimentation tank is connected to a final sedimentation tank sludge discharge facility, which is connected to a sludge recovery facility.

5. The integrated aquaculture wastewater treatment device as described in claim 1, characterized in that, The primary nitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank; the primary denitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank; the secondary nitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank; and the secondary denitrification sludge interception tank adopts an inclined tube sedimentation tank or a vertical flow sedimentation tank.

6. The integrated aquaculture wastewater treatment device as described in claim 1, characterized in that, The final sedimentation tank is a vertical flow sedimentation tank.

7. The integrated aquaculture wastewater treatment device as described in claim 1, characterized in that, The aeration system employs a multi-layer aeration device, with each layer of aeration device independently equipped with an aeration blower; or, the aeration system is a pure oxygen supply system.

8. An integrated aquaculture wastewater treatment process, characterized in that, The integrated aquaculture wastewater treatment device as described in any one of claims 1-7 is used, and the integrated aquaculture wastewater treatment process includes the following steps: Pretreatment steps: After solid-liquid separation and anaerobic treatment, the aquaculture wastewater flows into the integrated aquaculture wastewater treatment device for further treatment. The influent water quality of the integrated aquaculture wastewater treatment device is controlled to meet the following requirements: COD < 5000 mg / L, SS < 1000 mg / L, C / TKN < 3, and pH value 7~8. Primary nitrification step: Wastewater flows into the primary nitrification reactor for nitrification reaction. The effluent from the primary nitrification reactor is intercepted by the primary nitrification sludge interception tank to intercept sludge and consume dissolved oxygen. The sludge intercepted by the primary nitrification sludge interception tank is returned to the primary nitrification reactor, and the sludge return ratio is 3 to 5 times. Primary denitrification steps: The effluent from the primary nitrification sludge interception tank flows into the primary denitrification reactor for denitrification reaction. The primary denitrification sludge interception tank intercepts sludge from the effluent of the primary denitrification reactor. The sludge intercepted in the primary denitrification sludge interception tank is returned to the primary denitrification reactor. The sludge return ratio is 1 to 5 times. Secondary nitrification step: The effluent from the primary denitrification sludge interception tank flows into the secondary nitrification reactor for nitrification. The secondary nitrification sludge interception tank intercepts sludge and consumes dissolved oxygen in the effluent from the secondary nitrification reactor. The sludge intercepted in the secondary nitrification sludge interception tank is returned to the secondary nitrification reactor at a sludge return ratio of 3 to 5 times. Secondary denitrification step: The effluent from the secondary nitrification sludge retention tank flows into the secondary denitrification reactor for denitrification reaction. The secondary denitrification sludge retention tank retains sludge from the effluent of the secondary denitrification reactor. The sludge retained in the secondary denitrification sludge retention tank is returned to the secondary denitrification reactor. The sludge return ratio is 1 to 5 times. Final treatment steps: The effluent from the secondary denitrification sludge interception tank is treated sequentially by a coagulation reactor, a flocculation reactor, a final sedimentation tank, and a disinfection tank. Ferrous iron and lime are added to the coagulation reactor, PAM is added to the flocculation reactor, and disinfectant is added to the disinfection tank to achieve turbidity removal, sedimentation of large molecular organic matter, decolorization, chemical phosphorus removal, and disinfection.

9. The integrated aquaculture wastewater treatment process as described in claim 8, characterized in that, In the primary nitration step, the primary nitration reactor undergoes nitration reaction according to the following operating parameters: The reaction temperature is 15°C~40°C, the dissolved oxygen concentration is 4~8 mg / L, the pH value is greater than or equal to 7.0, the sludge concentration is 10000~20000 mg / L, and the sludge age is 12~22 days. In the first-stage denitrification step, the first-stage denitrification reactor operates according to the following parameters: The reaction temperature is 15°C~35°C, the dissolved oxygen concentration is 0.2~0.6 mg / L, the pH value is 6.5~8.0, the sludge concentration is 5000~15000 mg / L, and the sludge age is 8~18 days. In the secondary nitration step, the secondary nitration reactor carries out the nitration reaction according to the following operating parameters: The reaction temperature is 15°C~40°C, the dissolved oxygen concentration is 4~8 mg / L, the pH value is greater than or equal to 7.0, the sludge concentration is 5000~10000 mg / L, and the sludge age is 15~25 days. In the secondary denitrification step, the secondary denitrification reactor operates according to the following parameters: The reaction temperature is 15°C~35°C, the dissolved oxygen concentration is 0.2~0.6mg / L, the pH value is 6.5~8.0, the sludge concentration is 3000~6000mg / L, and the sludge age is 18~28d.

10. The integrated aquaculture wastewater treatment process as described in claim 9, characterized in that, In the primary nitrification step and the secondary nitrification step, when the pH value is less than 7.0, the alkalinity is increased by external alkali supplementation; in the primary denitrification step and the secondary denitrification step, the carbon source is supplemented by external carbon supplementation.

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