High-load biological pretreatment method for treating high-concentration organic waste liquid

Abstract

The invention relates to a high-load biological pretreatment method for treating high-concentration organic waste liquid, and relates to the technical field of wastewater treatment.The method comprises the steps that the high-concentration organic waste liquid is discharged into a preset adjusting tank; the high-concentration organic waste liquid in the adjusting tank is discharged into a preset air flotation device; high-concentration organic waste liquid in the air flotation device is introduced into a preloaded biological pretreatment tank; high-concentration organic waste liquid sludge in the high-load biological pretreatment tank is discharged into a preset denitrification tank; high-concentration organic waste liquid sludge in the denitrification tank is discharged into a preset nitrification tank; and discharging the high-concentration organic waste liquid sludge in the nitrification tank into a preset membrane filter box, and carrying out sludge-water separation. Based on the high-load biological pretreatment tank, a traditional technological process is improved, on the premise that the waste liquid treatment requirement is met, biological reaction and sedimentation are integrated, a sedimentation tank is omitted, potential safety hazards are effectively eliminated, and meanwhile treatment efficiency and safety guarantee are considered.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a high-load biological pretreatment method for treating high-concentration organic waste liquid. Background Art

[0002] High-concentration organic waste liquid has water quality characteristics such as high COD (Chemical Oxygen Demand), high SS (Suspended Solids), high oil, and high viscosity. The existing physical and chemical treatment technology coagulation sedimentation or flotation process has low efficiency in removing COD and SS, and the dosage of reagents is very large, the operating cost is high, and the ability to resist water quality and water volume shock load is weak; although the existing biological treatment technology anaerobic process has a good COD removal effect, anaerobic needs to be equipped with a heating device, and the biogas produced by anaerobic needs to be equipped with a series of biogas treatment facilities. The entire treatment system is very complicated, the project investment is relatively high, and there are huge safety hazards in biogas, and the operation and maintenance requirements are high and difficult. For details of the specific process flow, please see the attached Figure 1 .

[0003] Therefore, in order to meet actual needs, a high-load biological pretreatment technology for high-concentration organic waste liquid treatment is now provided. Summary of the invention

[0004] The present application provides a high-load biological pretreatment method for the treatment of high-concentration organic waste liquid. Based on a high-load biological pretreatment tank, the traditional process flow is improved. On the premise of ensuring the waste liquid treatment needs, the biological reaction and precipitation are integrated, the sedimentation tank is omitted, and safety hazards are effectively eliminated, while taking into account the treatment efficiency and safety assurance.

[0005] In a first aspect, the present application provides a high-load biological pretreatment method for treating high-concentration organic wastewater, the method comprising the following steps: Discharge high-concentration organic waste liquid into a preset regulating tank; Discharging the high-concentration organic waste liquid in the regulating tank into a preset air flotation device; Passing the high-concentration organic waste liquid in the air flotation device into a preset high-load biological pretreatment tank; Discharging the high-concentration organic waste liquid sludge in the high-load biological pretreatment tank into a preset denitrification tank; Discharging the high-concentration organic waste liquid sludge in the denitrification tank into a preset nitrification tank; The high-concentration organic waste liquid sludge in the nitrification tank is discharged into a preset membrane filter box for mud-water separation, the high-concentration organic waste liquid sewage separated by the membrane filter box is discharged, and the high-concentration organic waste liquid sludge separated by the membrane filter box is discharged into the high-load biological pretreatment tank and the denitrification tank; wherein, The high-load biological pretreatment tank is equipped with 4 switchable operating conditions, including aeration condition, stirring condition, sedimentation condition and sludge discharge condition.

[0006] On the basis of the above technical solution, the method further comprises the following steps: The high-concentration organic waste liquid sludge remaining in the high-load biological pretreatment tank is discharged into a preset sludge treatment system.

[0007] On the basis of the above technical solution, the high-load biological pretreatment tank provides oxygen to the interior thereof when it is in an aeration condition.

[0008] On the basis of the above technical solution, when the high-load biological pretreatment tank is in a stirring state, the stirring function is turned on to mix the return sludge and sewage therein.

[0009] On the basis of the above technical solution, when the high-load biological pretreatment tank is in a sedimentation condition, aeration and stirring are stopped to allow the sludge inside to settle naturally.

[0010] On the basis of the above technical solution, when the high-load biological pretreatment tank is in the sludge discharge condition, the residual sludge inside it is discharged.

[0011] In a second aspect, the present application provides a high-load biological pretreatment method for treating high-concentration organic wastewater, the method comprising the following steps: Discharge high-concentration organic waste liquid into a preset regulating tank; Discharging the high-concentration organic waste liquid in the regulating tank into a preset air flotation device; Passing the high-concentration organic waste liquid in the air flotation device into a preset high-load biological pretreatment tank; The high-concentration organic waste liquid sludge in the high-load biological pretreatment tank is sequentially discharged into a preset primary denitrification tank, a primary nitrification tank, a secondary denitrification tank and a secondary nitrification tank for secondary AO process treatment; The high-concentration organic waste liquid sludge in the secondary nitrification tank is discharged into a preset membrane filter box for mud-water separation, and the high-concentration organic waste liquid sewage separated by the membrane filter box is discharged, and the high-concentration organic waste liquid sludge separated by the membrane filter box is discharged into the high-load biological pretreatment tank, the primary denitrification tank and the secondary denitrification tank; wherein, The high-load biological pretreatment tank is equipped with 4 switchable operating conditions, including aeration condition, stirring condition, sedimentation condition and sludge discharge condition; The high-concentration organic waste liquid at least includes kitchen slurry and garbage leachate.

[0012] On the basis of the above technical solution, the method further comprises the following steps: The high-concentration organic waste liquid sludge remaining in the high-load biological pretreatment tank is discharged into a preset sludge treatment system.

[0013] On the basis of the above technical solution, the high-load biological pretreatment tank provides oxygen to the interior thereof when it is in an aeration condition.

[0014] On the basis of the above technical solution, when the high-load biological pretreatment tank is in a stirring state, the stirring function is turned on to mix the return sludge and sewage therein.

[0015] On the basis of the above technical solution, when the high-load biological pretreatment tank is in a sedimentation condition, aeration and stirring are stopped to allow the sludge inside to settle naturally.

[0016] On the basis of the above technical solution, when the high-load biological pretreatment tank is in the sludge discharge condition, the residual sludge inside it is discharged.

[0017] The beneficial effects of the technical solution provided by this application include: This application is based on a high-load biological pretreatment tank to improve the traditional process flow. Under the premise of ensuring the waste liquid treatment needs, it realizes the integration of biological reaction and precipitation, eliminates the sedimentation tank, effectively eliminates safety hazards, and takes into account treatment efficiency and safety assurance.

[0018] This application not only has a high organic matter removal rate (COD and SS removal rates of more than 60%, which can greatly reduce the subsequent treatment load), high COD volume load, small tank capacity, and is very economical and efficient; it can be operated at room temperature without heating, and has low operating energy consumption; compared with existing anaerobic technology, no biogas is produced, and no biogas treatment equipment is required, so the operation is safer and more economical; at the same time, by adjusting the operating mode, the sedimentation tank can be omitted, greatly saving engineering investment. .

[0019] It should be understood that both the foregoing general description and the following specific embodiments are for the purpose of example and illustration and do not necessarily limit the present application. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate the subject matter of the present application. At the same time, the specification and the drawings are used to explain the principles of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a flow chart of a conventional high-concentration organic waste liquid treatment process in an embodiment of the present application; Figure 2 A process flow chart of a high-load biological pretreatment method for treating high-concentration organic waste liquid provided in an embodiment of the present application; Figure 3 This is a schematic diagram of the internal structure of a high-load biological pretreatment tank in a high-load biological pretreatment method for treating high-concentration organic waste liquid provided in an embodiment of the present application; Figure 4 A cross-sectional view of a high-load biological pretreatment tank in a high-load biological pretreatment method for treating high-concentration organic waste liquid provided in an embodiment of the present application; Figure 5 This is a process flow chart of the high-load biological pretreatment method for high-concentration organic waste liquid treatment provided in the embodiments of the present application during secondary AO process treatment; In the figure: 1. Pretreatment tank; 2. Jet aerator; 3. Circulating water pump; 4. Outlet weir; 5. Blower; 6. Inlet pipe; 7. Outlet pipe; 8. Sludge return pipe; 9. Sludge discharge pipe; 10. Air supply pipe; 11. Bypass sewage pipe; 12. Circulating pump return sewage pipe; 13. Air supply pipe electric butterfly valve; 14. Bypass sewage pipe electric knife gate valve; 15. Sludge discharge electric knife gate valve. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0024] The embodiment of the present application provides a high-load biological pretreatment method for the treatment of high-concentration organic waste liquid. Based on the high-load biological pretreatment tank, the traditional process flow is improved. Under the premise of ensuring the waste liquid treatment needs, the biological reaction and precipitation are integrated, the sedimentation tank is omitted, and safety hazards are effectively eliminated, while taking into account the treatment efficiency and safety assurance.

[0025] In order to achieve the above technical effects, the overall idea of ​​this application is as follows: A high-load biological pretreatment method for treating high-concentration organic wastewater, the method comprising the following steps: S1. Discharge high-concentration organic waste liquid into a preset regulating tank; S2, discharge the high-concentration organic waste liquid in the regulating tank into the preset flotation device; S3, passing the high-concentration organic waste liquid in the flotation device into a preset high-load biological pretreatment tank; S4, discharge the high-concentration organic waste liquid sludge in the high-load biological pretreatment tank into the preset denitrification tank; S5, discharge the high-concentration organic waste liquid sludge in the denitrification tank into the preset nitrification tank; S6, discharge the high-concentration organic waste liquid sludge in the nitrification tank into a preset membrane filter box for mud-water separation, discharge the high-concentration organic waste liquid sewage separated by the membrane filter box, and discharge the high-concentration organic waste liquid sludge separated by the membrane filter box into a high-load biological pretreatment tank and a denitrification tank; wherein, The high-load biological pretreatment tank is equipped with 4 switchable operating conditions, including aeration condition, stirring condition, sedimentation condition and sludge discharge condition.

[0026] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0027] First, see Figures 1 to 4 As shown, the embodiment of the present application provides a high-load biological pretreatment method for treating high-concentration organic wastewater, the method comprising the following steps: S1. Discharge high-concentration organic waste liquid into a preset regulating tank; S2, discharge the high-concentration organic waste liquid in the regulating tank into the preset flotation device; S3, passing the high-concentration organic waste liquid in the flotation device into a preset high-load biological pretreatment tank; S4, discharge the high-concentration organic waste liquid sludge in the high-load biological pretreatment tank into the preset denitrification tank; S5, discharge the high-concentration organic waste liquid sludge in the denitrification tank into the preset nitrification tank; S6, discharge the high-concentration organic waste liquid sludge in the nitrification tank into a preset membrane filter box for mud-water separation, discharge the high-concentration organic waste liquid sewage separated by the membrane filter box, and discharge the high-concentration organic waste liquid sludge separated by the membrane filter box into a high-load biological pretreatment tank and a denitrification tank; wherein, The high-load biological pretreatment tank is equipped with 4 switchable operating conditions, including aeration condition, stirring condition, sedimentation condition and sludge discharge condition.

[0028] Specifically, the high-concentration organic waste liquid includes at least kitchen slurry and landfill leachate.

[0029] As shown in the attached figure of the specification Figure 1 As shown, it is a conventional high-concentration organic waste liquid treatment process flow chart, which requires an anaerobic reactor and generates biogas, which is quite different from the process of the technical solution of this application; In comparison, the technical solution of the embodiment of the present application has another technical difference, that is, the biological reaction and precipitation are integrated, eliminating the sedimentation tank.

[0030] It should be noted that in the embodiments of the present application: High-concentration organic wastewater: refers to biodegradable organic wastewater containing a large amount of organic matter, which may be dissolved or suspended. This type of wastewater usually comes from industrial production processes, including food processing, beverage production, papermaking, petrochemicals, pharmaceutical industry, restaurant slurry, and landfill leachate. High-concentration organic wastewater is characterized by high COD, high BOD (Biochemical Oxygen Demand), and high SS;

[0031] High-concentration organic waste liquid can be at least kitchen slurry and landfill leachate; Restaurant kitchen slurry refers specifically to the slurry after restaurant kitchen waste has been pre-treated and physically extracted for oil; Garbage leachate refers specifically to the initial leachate of landfills and the leachate of garbage transfer stations (the leachate of landfills in the middle and late stages is not within the definition.

[0032] The technical solution of the embodiment of the present application is based on a high-load biological pretreatment tank to improve the traditional process flow. Under the premise of ensuring the waste liquid treatment needs, it realizes the integration of biological reaction and precipitation, eliminates the sedimentation tank, effectively eliminates safety hazards, and takes into account the treatment efficiency and safety assurance.

[0033] Furthermore, the method further comprises the following steps: The high-concentration organic waste liquid sludge remaining in the high-load biological pretreatment tank is discharged into a preset sludge treatment system.

[0034] Furthermore, the high-load biological pretreatment tank is equipped with four switchable operating conditions, including an aeration condition, a stirring condition, a sedimentation condition, and a sludge discharge condition.

[0035] Based on the technical solution of the embodiment of the present application, during the specific implementation, the situation is as follows: The present application provides a high-load biological pretreatment method for the treatment of high-concentration organic waste liquid. This method not only has a high organic matter removal rate (COD and SS removal rates are above 60%, which can greatly reduce the subsequent treatment load), but also has a high COD volumetric load and a small tank capacity, and is very economical and efficient; it can be operated at room temperature without heating, and has low operating energy consumption; compared with existing anaerobic technology, no biogas is produced, and no biogas treatment equipment is required, and the operation is safer and more economical; at the same time, by adjusting the operating mode, the sedimentation tank can be omitted, greatly saving engineering investment.

[0036] As shown in the attached figure of the specification Figure 2As shown, it is a process flow chart of the technical solution of the embodiment of the present application, and the equipment details are as follows: A. Adjustment tank: The water quantity and quality of kitchen slurry vary greatly. Setting up an adjustment tank can reduce the impact on subsequent treatment systems and ensure stable operation.

[0037] B. Air flotation device: used to remove grease and suspended solids SS from kitchen slurry to ensure stable and efficient operation of high-load biological pretreatment tank.

[0038] C. High-load biological pretreatment tank: bioreactor, a place to achieve efficient removal of pollutants such as COD and SS in food slurry.

[0039] D. Denitrification tank: a bioreactor for removing total nitrogen.

[0040] E. Nitrification tank: A bioreactor for removing COD, BOD and ammonia nitrogen.

[0041] F. Membrane filter box: a device for separating mud and water.

[0042] G. Sludge return pump: The intercepted sludge is returned to the front-end high-load biological pretreatment tank and denitrification tank through the pump to increase the sludge concentration in the reactor and achieve total nitrogen removal.

[0043] In the above process flow, after the high-concentration organic waste liquid is deoiled and suspended solids SS is removed by flotation, the effluent enters the high-load biological pretreatment tank from the bottom, and quickly mixes with the bottom return sludge. The sewage and sludge undergo flocculation, adsorption, and biodegradation. The treated sewage is discharged from the upper effluent weir of the pretreatment tank and enters the next treatment unit. The aged sludge at the bottom is regularly discharged to ensure the biological activity in the pretreatment tank. The pretreatment tank makes full use of the short-term adsorption capacity of the return sludge, and operates under high load and short sludge age conditions, which can achieve rapid and efficient reduction of COD and SS in wastewater, greatly reducing the treatment load of subsequent process units.

[0044] The high-load biological pretreatment tank is equipped with multiple operating modes, which can realize the conversion of four operating conditions: aeration, stirring, sedimentation, and sludge discharge, realizing the integration of biological reaction and sedimentation, eliminating the sedimentation tank. The specific instructions are as follows:

[0045] 1. Aeration conditions: Provide oxygen to the pretreatment tank to keep the reactor in an oxygen-deficient state. Microorganisms will continue to multiply and renew in this environment, and COD in the kitchen slurry will be removed efficiently.

[0046] 2. Agitation conditions: In actual operation, when the DO concentration in the reactor is too high (the water quality and quantity of high-concentration organic waste liquid vary greatly, and the actual gas supply and gas demand may differ or be adjusted untimely), aeration can be stopped and the agitation function can be turned on to achieve effective mixing of the return sludge and sewage to ensure efficient biological reaction.

[0047] 3. Sedimentation conditions: After a period of reaction, the sludge in the reactor will age, and it is necessary to stop the aeration and stirring functions to allow the sludge to settle naturally.

[0048] 4. Sludge discharge conditions: The aged residual sludge at the bottom is discharged.

[0049] Through the multiple operating modes of the high-load biological pretreatment tank, the four operating conditions of aeration, stirring, sedimentation and sludge discharge can be switched, and the biological reaction and sedimentation are integrated, eliminating the sedimentation tank.

[0050] As shown in the attached figure of the specification Figure 3 and Figure 4 As shown, it is a schematic diagram and a cross-sectional view of the internal structure of the high-load biological pretreatment tank. The structural details of the high-load biological pretreatment tank are as follows: Pretreatment tank: Bioreactor, a place to achieve efficient removal of pollutants such as COD and SS, and enamel assembled tanks can be used.

[0051] Jet aerator: provides oxygen or stirring for bioreactor.

[0052] Circulating water pump: provides power water for the jet aerator.

[0053] Outlet weir: It is set on the upper part of the pretreatment tank to stabilize the water outlet.

[0054] Blower: Provides air source for the jet aerator.

[0055] Inlet pipe: The kitchen slurry flows into the bioreactor through the bottom inlet pipe.

[0056] Outlet pipe: After biological pretreatment, the kitchen slurry enters the next treatment unit through the upper outlet pipe.

[0057] Sludge return pipe: Enters the pretreatment tank from the bottom to replenish fresh sludge for the pretreatment tank.

[0058] Sludge discharge pipe: Aged sludge at the bottom of the pretreatment tank is discharged regularly.

[0059] Gas supply pipe: provides oxygen to the bioreactor or acts as a stirrer.

[0060] Bypass sewage pipe: provides power water for the jet aerator.

[0061] Circulating pump return sewage pipe: the pipe between the circulating pump outlet pipe and the jet aerator.

[0062] Electric butterfly valve for gas supply pipe: Electric valve for gas supply pipe, which can automatically open and close according to the automatic control program according to the operation needs.

[0063] Bypass sewage pipe electric knife gate valve: Bypass sewage pipe electric valve, which can automatically open and close according to the automatic control program according to the operation needs.

[0064] Electric knife gate valve for mud discharge: It can automatically open and close and discharge mud according to the automatic control program as required.

[0065] Second, as shown in the accompanying drawings of the specification Figure 5 As shown, the embodiment of the present application provides a high-load biological pretreatment method for treating high-concentration organic wastewater, the method comprising the following steps: A1. Discharge high-concentration organic waste liquid into the preset regulating tank; A2, discharging the high-concentration organic waste liquid in the regulating tank into a preset air flotation device; A3, passing the high-concentration organic waste liquid in the air flotation device into a preset high-load biological pretreatment tank; A4, discharging the high-concentration organic waste liquid sludge in the high-load biological pretreatment tank into a preset primary denitrification tank, a primary nitrification tank, a secondary denitrification tank and a secondary nitrification tank in sequence for secondary AO process treatment; A5, discharge the high-concentration organic waste liquid sludge in the secondary nitrification tank into a preset membrane filter box for mud-water separation, discharge the high-concentration organic waste liquid sewage separated by the membrane filter box, and discharge the high-concentration organic waste liquid sludge separated by the membrane filter box into the high-load biological pretreatment tank, the primary denitrification tank and the secondary denitrification tank; wherein, The high-load biological pretreatment tank is equipped with 4 switchable operating conditions, including aeration condition, stirring condition, sedimentation condition and sludge discharge condition.

[0066] Specifically, the high-concentration organic waste liquid includes at least kitchen slurry and landfill leachate.

[0067] Among them, the AO process, the full name of which is Anaerobic Oxic process, is a process widely used in sewage treatment.

[0068] The technical solution of the embodiment of the present application is based on a high-load biological pretreatment tank to improve the traditional process flow. Under the premise of ensuring the waste liquid treatment needs, it realizes the integration of biological reaction and precipitation, eliminates the sedimentation tank, effectively eliminates safety hazards, and takes into account the treatment efficiency and safety assurance.

[0069] Furthermore, the method further comprises the following steps: The high-concentration organic waste liquid sludge remaining in the high-load biological pretreatment tank is discharged into a preset sludge treatment system.

[0070] It should be noted that the high-load biological pretreatment method mentioned in the embodiments of the present application and the high-load biological pretreatment method mentioned in the first aspect are similar in terms of technical problems, technical solutions and technical effects at the technical principle level, so they will not be elaborated here.

[0071] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0072] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A high-load biological pretreatment method for high-concentration organic waste liquid treatment, characterized in that: The method comprises the following steps: Discharge high-concentration organic waste liquid into a preset regulating tank; Discharging the high-concentration organic waste liquid in the regulating tank into a preset air flotation device; Passing the high-concentration organic waste liquid in the air flotation device into a preset high-load biological pretreatment tank; Discharging the high-concentration organic waste liquid sludge in the high-load biological pretreatment tank into a preset denitrification tank; Discharging the high-concentration organic waste liquid sludge in the denitrification tank into a preset nitrification tank; The high-concentration organic waste liquid sludge in the nitrification tank is discharged into a preset membrane filter box for mud-water separation, the high-concentration organic waste liquid sewage separated by the membrane filter box is discharged, and the high-concentration organic waste liquid sludge separated by the membrane filter box is discharged into the high-load biological pretreatment tank and the denitrification tank; wherein, The high-load biological pretreatment tank is equipped with 4 switchable operating conditions, including aeration condition, stirring condition, sedimentation condition and sludge discharge condition; The high-concentration organic waste liquid at least includes kitchen slurry and garbage leachate.

2. The high-load biological pretreatment method for high-concentration organic waste liquid treatment according to claim 1, characterized in that: The method further comprises the following steps: The high-concentration organic waste liquid sludge remaining in the high-load biological pretreatment tank is discharged into a preset sludge treatment system.

3. The high-load biological pretreatment method for high-concentration organic waste liquid treatment according to claim 1, characterized in that: When the high-load biological pretreatment tank is in an aerated condition, oxygen is provided to the interior of the tank.

4. The high-load biological pretreatment method for high-concentration organic waste liquid treatment according to claim 1, characterized in that: When the high-load biological pretreatment tank is in a stirring state, the stirring function is turned on to mix the return sludge and sewage inside the tank.

5. The high-load biological pretreatment method for high-concentration organic waste liquid treatment according to claim 1, characterized in that: When the high-load biological pretreatment tank is in a sedimentation state, aeration and stirring are stopped to allow the sludge inside to settle naturally.

6. The high-load biological pretreatment method for treating high-concentration organic waste liquid according to claim 1, characterized in that: When the high-load biological pretreatment tank is in the sludge discharge condition, the residual sludge inside the tank is discharged.

7. A high-load biological pretreatment method for high-concentration organic wastewater treatment, characterized in that: The method comprises the following steps: Discharge high-concentration organic waste liquid into a preset regulating tank; Discharging the high-concentration organic waste liquid in the regulating tank into a preset air flotation device; Passing the high-concentration organic waste liquid in the air flotation device into a preset high-load biological pretreatment tank; The high-concentration organic waste liquid sludge in the high-load biological pretreatment tank is sequentially discharged into a preset primary denitrification tank, a primary nitrification tank, a secondary denitrification tank and a secondary nitrification tank for secondary AO process treatment; The high-concentration organic waste liquid sludge in the secondary nitrification tank is discharged into a preset membrane filter box for mud-water separation, and the high-concentration organic waste liquid sewage separated by the membrane filter box is discharged, and the high-concentration organic waste liquid sludge separated by the membrane filter box is discharged into the high-load biological pretreatment tank, the primary denitrification tank and the secondary denitrification tank; wherein, The high-load biological pretreatment tank is equipped with 4 switchable operating conditions, including aeration condition, stirring condition, sedimentation condition and sludge discharge condition; The high-concentration organic waste liquid at least includes kitchen slurry and garbage leachate.

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