Biochemical treatment device for organic cleaning wastewater

Abstract

The utility model provides an organic cleaning wastewater biochemical treatment device capable of efficiently removing nitrogen and phosphorus. The organic cleaning wastewater biochemical treatment device adopts an innovative structure of a hydrolytic acidification coupled two-stage aerobic and MBR-TMF double-membrane system. The device is formed by sequentially connecting a wastewater regulating tank, a hydrolysis acidification tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, an MBR membrane tank, a TMF circulating tank and a clean water tank in series, biological stuffing is arranged in the primary / secondary aerobic tank to realize organic matter degradation, and the MBR membrane tank realizes mud-water separation through an MBR membrane assembly. According to the utility model, through the cooperation of the MBR and the TMF, the TMF circulating pump returns a concentrated solution to the front end of the MBR to realize secondary degradation of pollutants, and the recovery rate of the system is increased by 15-20%; a'hydrolytic acidification + two-stage aerobic + anoxic 'biochemical unit is constructed, two-stage aerobic realizes dissolved oxygen gradient control through independent aeration, and a complete nitrification-denitrification system is formed by the two-stage aerobic unit and an anoxic tank.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment devices, specifically to a biochemical treatment device for organic cleaning wastewater. Background Technology

[0002] Organic cleaning wastewater contains high concentrations of COD, total nitrogen (TN), total phosphorus (TP), and recalcitrant organic matter. Traditional processes suffer from low nitrogen and phosphorus removal efficiency, complex processes, and unstable effluent. In existing technologies, single aerobic or anaerobic processes are insufficient to achieve efficient nitrogen and phosphorus removal simultaneously, and MBR membrane tanks typically operate independently, resulting in inadequate synergistic optimization of sludge return and nitrification liquor return.

[0003] The utility model patent with announcement number CN222250275U purifies water by setting up a hydrolysis acidification tank and an aerobic tank, utilizing microorganisms in the aerobic tank to adsorb organic pollutants in the water, thereby improving the removal capacity of total nitrogen and total phosphorus. However, the technology lacks a filtration system and cannot be directly applied to cleaning water in the electronics industry. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a biochemical treatment device for organic cleaning wastewater, which improves the efficiency of nitrogen and phosphorus removal through the coupling of multi-stage biochemical reaction and MBR membrane separation.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] An organic cleaning wastewater biochemical treatment device includes a wastewater equalization tank, a hydrolysis acidification tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, an MBR membrane tank, a TMF circulation tank, and a clear water tank arranged in sequence.

[0007] The primary and secondary aerobic tanks are equipped with aerobic tank packing material. The MBR membrane tank contains an MBR membrane module. The TMF circulation tank contains a TMF membrane module. A TMF circulation pump is installed at the bottom of the TMF circulation tank. The TMF circulation pump pumps the concentrate in the TMF circulation tank back to the front end of the MBR membrane tank.

[0008] Furthermore, the outlet of the MBR membrane module is connected to the clear water tank via a suction pump.

[0009] Furthermore, the MBR membrane module includes a hollow fiber membrane module or a flat sheet membrane module.

[0010] Furthermore, the MBR membrane tank is also equipped with a sludge return pump, which is connected back to the primary aerobic tank.

[0011] Furthermore, the TMF membrane module includes a tubular ultrafiltration membrane module, which is arranged in an array along the wastewater flow direction.

[0012] Furthermore, the TMF circulation tank is also equipped with a pulse backwashing system, which is connected to a water pump and a blower. The water pump and the backwash blower respectively use high-pressure water and compressed air to colloidally impact the tubular ultrafiltration membrane module, which is used to perform water-air combined pulse backwashing on the tubular ultrafiltration membrane module.

[0013] Furthermore, the inlet of the TMF circulation tank is equipped with a pre-filter screen with a filtration accuracy of 50-100 μm. The TMF circulation tank is also equipped with a pulse backwashing system, which is connected to a water pump and a blower via high-pressure water pipes and compressed air pipes, respectively, for performing combined water-air pulse backwashing on the tubular ultrafiltration membrane module.

[0014] Furthermore, the anoxic tank is also equipped with a nitrification liquid return pump, which is connected back to the hydrolysis acidification tank.

[0015] Furthermore, at least one of the primary aerobic tank, secondary aerobic tank, MBR membrane tank, and TMF circulating tank is equipped with an aeration pipe, which is connected to the output end of the aeration blower via an air supply pipe.

[0016] Furthermore, the aeration pipes are independently installed in the primary aerobic tank and the secondary aerobic tank, and the dissolved oxygen gradient control structure is achieved through the aeration blowers connected to each pipe.

[0017] Furthermore, the pre-filter screen is detachably installed at the inlet end of the TMF circulation tank.

[0018] The advantages and beneficial effects of this utility model are as follows:

[0019] 1. The MBR+TMF dual-membrane system forms a treatment barrier. The design of the TMF circulation pump returning the concentrate to the MBR front end can further intercept residual small particles, colloids, or large molecular organic matter in the MBR effluent, making the effluent quality close to the ultrafiltration / reverse osmosis level, achieving secondary degradation of pollutants, and increasing the system recovery rate by 15-20%, meeting the cleaning water treatment requirements of the electronics industry. Returning the concentrate to the front-end biological tank through the TMF circulation tank can also enhance the secondary biodegradation of recalcitrant pollutants, while reducing the risk of MBR membrane fouling.

[0020] 2. The TMF system is equipped with a 50-100μm pre-filter screen to effectively intercept large particles; the pulse backwashing system (water-air combined) improves membrane flux recovery rate by more than 30% compared to traditional backwashing methods. The arrayed tubular membrane modules optimize hydraulic distribution and reduce membrane fouling rate.

[0021] 3. This utility model adopts a biochemical combination process of "hydrolysis acidification + two-stage aerobic + anoxic" to form a complete nitrification-denitrification denitrification system. The pretreatment in the hydrolysis acidification tank improves the biodegradability of wastewater, the two-stage aerobic tank enhances the degradation of organic matter through the packing biofilm, and the anoxic tank achieves deep denitrification. The synergy of the process is significantly better than that of traditional single treatment units. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the TMF circulating pool of this utility model;

[0024] In the diagram: 1-Pre-filter screen, 2-Tube ultrafiltration membrane module, 3-TMF circulation pump, 4-High-pressure water pump, 5-Flushing fan. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0026] The organic cleaning wastewater biochemical treatment device in this embodiment is as follows: Figure 1 As shown, the system comprises, in sequence, a wastewater equalization tank, a hydrolysis acidification tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, an MBR membrane tank, a TMF (tubular microfiltration) circulation tank, and a clear water tank. The tanks are connected by pipes equipped with valves and flow meters (not shown in the diagram) to control the water flow direction and flow rate.

[0027] The wastewater equalization tank receives organic cleaning wastewater. The tank is equipped with a level sensor and a stirrer to equalize and regulate the water quality. The retention time is 6-8 hours.

[0028] The hydrolysis acidification tank contains suspended elastic packing material with a filling rate of 60%-70% and a hydraulic retention time of 12-15 hours. Wastewater undergoes hydrolysis and acidification here, breaking down large organic molecules into smaller ones and improving its biodegradability. Perforated aeration pipes are installed at the bottom of the tank for micro-aeration to prevent sludge deposition.

[0029] The primary aerobic tank contains a modular biological packing material (such as porous polyethylene packing material) with a filling rate of 50%-60%. An aeration blower is connected via an independent aeration pipe, and dissolved oxygen (DO) is controlled at 2-3 mg / L. A sludge return pump is installed in the tank to inject activated sludge returned from the MBR membrane tank, enhancing the degradation of organic matter.

[0030] A submersible mixer is installed in the anoxic tank, with DO ≤ 0.5 mg / L. The nitrified liquor from the end of the secondary aerobic tank 5 is returned to the anoxic tank via the nitrification liquor return pump 10, and nitrogen removal is achieved through denitrification.

[0031] The secondary aerobic tank has a similar structure to the primary aerobic tank, but the DO is controlled at 3-4 mg / L. Gradual oxygenation is achieved through independent aeration blowers to further oxidize the remaining organic matter and complete the nitrification reaction.

[0032] The MBR membrane tank incorporates hollow fiber membrane modules (pore size 0.1-0.4 μm), with a membrane flux of 15-20 L / (m²). 2 •h). The suction pump delivers the membrane permeate to the clear water tank, the sludge return pump returns part of the sludge to the primary aerobic tank, and the remaining sludge is discharged periodically.

[0033] A pre-filter screen 1 (stainless steel, 80 μm pore size) is installed at the inlet of the TMF circulation tank and can be detached via clips or bolts to intercept large particles. Inside the tank, an array of tubular ultrafiltration membrane modules 2 (50 kDa molecular weight cutoff) are installed. The TMF circulation pump 3 returns the concentrate to the front end of the MBR membrane tank for secondary treatment. A pulse backwashing system, using a high-pressure water pump 4 and a backwashing fan 5, flushes the membrane modules every 30 minutes with a combined water pressure of 0.5 MPa and an air pressure of 0.3 MPa, with each flush lasting 30 seconds.

[0034] The clear water tank stores the final produced water and is equipped with an ultraviolet disinfection module to ensure that the effluent meets the reuse standards.

[0035] As a preferred technical solution, the MBR membrane module can be replaced with a flat sheet membrane, and the TMF membrane module can use a ceramic tubular membrane. The pre-filtration screen precision is adjusted to 50 μm, which is suitable for high suspended solids wastewater scenarios.

[0036] This invention achieves efficient purification through multi-stage synergistic action. Its working principle is as follows: The wastewater equalization tank receives unstable organic cleaning wastewater, homogenizes the water quality using a stirrer, and maintains a 6-8 hour retention time to buffer water volume fluctuations, providing stable influent conditions for subsequent treatment. In the hydrolysis acidification tank, under a facultative anaerobic environment (with only micro-aeration to prevent sludge deposition), hydrolytic acidifying bacteria on the elastic packing decompose large organic molecules (such as oils and proteins) into smaller fatty acids and monosaccharides, improving the wastewater's biodegradability. A 12-15 hour retention time ensures sufficient reaction. The primary aerobic tank uses high-density biological packing loaded with aerobic bacteria to rapidly degrade small organic molecules, while nitrifying sludge returned from the MBR enhances the initial oxidation of ammonia nitrogen. The anoxic tank maintains an anaerobic state. In the secondary aerobic tank, the returned nitrified liquid (containing nitrates) is denitrified by denitrifying bacteria, using organic matter as a carbon source to reduce nitrates to nitrogen, achieving denitrification. The secondary aerobic tank promotes the complete oxidation of residual ammonia nitrogen into nitrate by nitrifying bacteria, while also deeply degrading recalcitrant organic matter, thus achieving simultaneous removal of carbon and nitrogen.

[0037] The MBR membrane tank utilizes hollow fiber membranes / flat sheet membranes to efficiently retain activated sludge and improve biochemical efficiency. Permeate is pumped into the TMF (tumor filtration) circulation tank, while sludge is returned to the primary aerobic tank to maintain system biomass. The TMF circulation tank further intercepts dissolved macromolecules and colloids, and the concentrate is returned to the MBR front end for further treatment. Pre-filter screens protect the membrane modules. Pulse backwashing (water-air combined) ensures membrane flux stability.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A biochemical treatment device for organic cleaning wastewater, characterized in that, It includes a wastewater equalization tank, a hydrolysis acidification tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, an MBR membrane tank, a TMF circulation tank, and a clear water tank, which are connected in sequence by pipelines. Both the primary and secondary aerobic tanks are equipped with aerobic tank packing material; the MBR membrane tank contains an MBR membrane module, and the outlet of the MBR membrane module is connected to the clear water tank via a suction pump.

2. The organic cleaning wastewater biochemical treatment device according to claim 1, characterized in that, The MBR membrane module is selected from hollow fiber membrane modules or flat sheet membrane modules.

3. The organic cleaning wastewater biochemical treatment device according to claim 1, characterized in that, The MBR membrane tank is also equipped with a sludge return pump, which is connected to the primary aerobic tank via a pipeline.

4. The organic cleaning wastewater biochemical treatment device according to claim 1, characterized in that, The TMF circulation tank contains a TMF membrane module, and a TMF circulation pump is installed at the bottom of the TMF circulation tank. The TMF circulation pump pumps the concentrate in the TMF circulation tank back to the front end of the MBR membrane tank through a pipeline.

5. The organic cleaning wastewater biochemical treatment device according to claim 4, characterized in that, The TMF membrane module includes a tubular ultrafiltration membrane module, which is arranged in an array along the wastewater flow direction.

6. The organic cleaning wastewater biochemical treatment device according to claim 5, characterized in that, The TMF circulation tank is also equipped with a pulse backwashing system, which is connected to a water pump and a blower through a high-pressure water pipe and a compressed air pipe, respectively, for performing combined water and air pulse backwashing on the tubular ultrafiltration membrane module.

7. The organic cleaning wastewater biochemical treatment device according to claim 4, characterized in that, A pre-filter screen is installed at the inlet of the TMF circulation tank, and the filtration accuracy of the pre-filter screen is 50-100 μm.

8. The organic cleaning wastewater biochemical treatment device according to claim 1, characterized in that, The anoxic tank is equipped with a nitrification liquid return pump, which is connected to the hydrolysis acidification tank via a pipeline.

9. The organic cleaning wastewater biochemical treatment device according to claim 1, characterized in that, At least one of the primary aerobic tank, secondary aerobic tank, MBR membrane tank, and TMF circulating tank is equipped with an aeration pipe, which is connected to the output end of an aeration blower via an air supply pipe.

10. The organic cleaning wastewater biochemical treatment device according to claim 9, characterized in that, The aeration pipes are independently installed in the primary aerobic tank and the secondary aerobic tank, forming a dissolved oxygen gradient control structure.

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