Integrated sewage treatment device

Abstract

The utility model relates to an integrated sewage treatment device integrating a biological contact oxidation technology and a membrane separation technology, which mainly solves the technical problems of membrane pollution, low automation degree, large occupied area and the like in the prior art. Comprising an aeration tank, a membrane tank and an equipment room which are integrated in a container, a plurality of aeration discs are arranged at the bottom of the aeration tank, elastic filler is hung in the middle of the aeration tank, the aeration tank is connected with an air blower through an aeration pipe, and the air blower provides oxygen needed by metabolism for microorganisms through the aeration discs; the membrane tank is provided with a membrane component; an aeration branch pipe is arranged at the bottom of the membrane tank and is connected with the air blower; the equipment room is provided with an air blower, a water inlet pump, a water producing pump, a reflux pump, a backwashing water pump, an ultraviolet sterilizer, a backwashing water tank and a PLC (Programmable Logic Controller) control cabinet; all the components are connected through pipelines and are controlled by a PLC control cabinet.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an integrated wastewater treatment device that integrates biological contact oxidation and membrane separation technologies, suitable for decentralized wastewater treatment scenarios such as rural areas and tourist attractions. Background Technology

[0002] In rural areas and tourist attractions where domestic sewage is scattered and difficult to collect, integrated sewage treatment devices are a relatively economical and feasible solution.

[0003] Biological contact oxidation is a highly efficient wastewater treatment process that primarily uses a biofilm attached to a carrier (commonly known as packing material) to purify wastewater. Its key features include packing material within the tank, bottom aeration to oxygenate the wastewater, and continuous flow of the wastewater to ensure thorough contact between the wastewater and the packing material. The basic principle of wastewater purification is that the biofilm adsorbs organic matter in the wastewater; under aerobic conditions, the organic matter is oxidized and decomposed by microorganisms, thus purifying the wastewater. The oxygen required by the microorganisms is supplied by aeration. Once the biofilm reaches a certain thickness, the microorganisms on the packing material wall undergo anaerobic metabolism due to oxygen deficiency. The resulting gases and the scouring effect of aeration cause the biofilm to detach and promote the growth of new biofilm. The detached biofilm then flows out of the tank with the effluent. Compared to the traditional activated sludge process, it offers advantages such as high sludge concentration, long sludge age, and low sludge production, making it commonly used in integrated wastewater treatment systems. However, due to factors such as temperature changes and water quality fluctuations, it is prone to issues such as high turbidity and increased suspended solids in the effluent.

[0004] Another membrane separation technology can effectively separate sludge and water, and when combined with activated sludge, it forms an MBR treatment system. Utilizing the membrane's high retention efficiency, microorganisms and large organic molecules are completely trapped within the bioreactor, resulting in effluent that is almost entirely free of suspended solids. However, the application of membranes also brings new problems such as flux decline and reduced lifespan due to membrane fouling.

[0005] The locations where these integrated wastewater treatment devices are used rarely have professional technicians to operate and maintain them, which makes the problems that occur during the operation of the equipment even more serious. Utility Model Content

[0006] The purpose of this invention is to provide an integrated wastewater treatment device that combines biological contact oxidation and membrane separation technologies, mainly to solve the following technical problems:

[0007] 1. The accelerated membrane fouling problem caused by combining traditional activated sludge process with MBR process;

[0008] 2. The problem of low automation and complex maintenance in decentralized wastewater treatment scenarios;

[0009] 3. The multi-unit split design results in low integration and a large footprint.

[0010] The technical solution of this utility model is as follows: An integrated sewage treatment device includes an aeration tank, a membrane tank, and an equipment room integrated within a container, wherein: the bottom of the aeration tank is provided with several aeration discs, elastic packing is suspended in the middle of the aeration tank, and the aeration tank is connected to a blower through aeration pipes, which provides oxygen required for microorganism metabolism through the aeration discs; the membrane tank is provided with membrane modules, and aeration branch pipes are provided at the bottom of the membrane tank and connected to the blower; the equipment room is equipped with a blower, an influent pump, a product water pump, a return pump, a backwash water pump, an ultraviolet sterilizer, a backwash water tank, and a PLC control cabinet; each component is connected through pipelines and controlled by the PLC control cabinet.

[0011] The aeration tank and the membrane tank are separated and connected by a connecting hole. The mixed liquor in the aeration tank enters the membrane tank through the connecting hole.

[0012] The permeate pump is connected to the permeate outlet of the membrane module via a pipeline, with a permeate valve installed in the middle; one outlet pipeline of the permeate pump is connected to the backwash water tank via a return valve, and the other outlet pipeline is connected to the inlet of the ultraviolet sterilizer via a drain valve, and the outlet pipeline of the ultraviolet sterilizer is connected to the drain outlet.

[0013] The inlet of the backwash water pump is connected to the outlet of the backwash water tank, and the outlet of the backwash water pump is connected to the membrane module product water pipeline. A filter and a backwash valve are installed in sequence in between.

[0014] The inlet of the reflux pump is connected to the lower part of the membrane tank, and the outlet of the reflux pump is connected to the upper part of the aeration tank.

[0015] The backwash water tank is equipped with a level switch to control the opening of the drain valve and the return valve.

[0016] A dissolved oxygen probe is installed in the aeration tank to monitor the dissolved oxygen concentration. The blower is a variable frequency blower, which can automatically adjust the blower volume according to the dissolved oxygen concentration to control the dissolved oxygen in the aeration tank at a suitable concentration.

[0017] A level gauge is installed in the membrane tank and interlocked with the permeate pump to continuously monitor the liquid level in the membrane tank / aeration tank.

[0018] The beneficial effects of this utility model are:

[0019] 1. The aeration tank adopts a biological contact oxidation treatment process. The aerobic, anaerobic, and facultative bacteria attached to the surface of the packing work together to degrade organic matter and remove ammonia nitrogen and total nitrogen. The separation of anaerobic and aerobic zones and the mixed liquor reflux device are eliminated, making the device more simplified. Since most microorganisms are attached to the surface of the packing, the concentration of microorganisms in the mixed liquor entering the membrane tank is relatively low, which helps to delay the microbial contamination of the membrane surface.

[0020] 2. The use of MBR membranes for sludge-water separation reduces the concentration of suspended solids in the effluent, while increasing the sludge concentration in the aeration tank, reducing the volume of the reaction tank, and stabilizing the effluent quality.

[0021] 3. The aeration tank, membrane tank, and equipment room are integrated into a single container, which has a high degree of integration, facilitates equipment transportation, minimizes external installation work, and has an aesthetically pleasing appearance.

[0022] 4. A backwashing device is installed, which can automatically perform backwashing cleaning; and the backwashing device can perform in-situ chemical cleaning, eliminating the need to lift the membrane module out of the membrane tank for offline cleaning, simplifying cleaning and maintenance.

[0023] 5. Multiple detection instruments and automatic valves are set up and automatically controlled through a PLC control cabinet to achieve continuous and automated operation with minimal human intervention.

[0024] 6. All machinery and equipment are placed in the equipment room, which extends the service life of the equipment compared to outdoor exposure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] In the diagram: 1-Aeration tank, 101-Aeration disc, 102-Elastic packing, 103-Aeration pipe, 104-Connecting hole, 105-Dissolved oxygen probe; 2-Membrane tank, 201-Membrane module, 202-Aeration branch pipe, 203-Level gauge; 3-Equipment room, 301-Blower, 302-Inlet pump, 303-Product water pump, 304-Return pump, 305-Backwash water pump, 306-UV sterilizer, 307-Backwash water tank, 308-PLC control cabinet, 309-Level switch, 310-Drain valve, 311-Return valve, 312-Filter. Detailed Implementation

[0027] Reference Figure 1An integrated wastewater treatment device includes an aeration tank 1, a membrane tank 2, and an equipment room 3 integrated within a container. The aeration tank 1 has several aeration discs 101 at its bottom, and elastic packing material 102 (φ150 combined packing material) is suspended in the middle of the aeration tank 1. The aeration tank 1 is connected to a blower 301 via an aeration pipe 103. This blower is a variable frequency blower (blower air volume 100 m³ / h, pressure 30 kPa), and the blower 301 provides oxygen for microorganisms to metabolize through the aeration discs 101. The membrane tank 2 is equipped with a membrane module 201 (Sumitomo SPMW12B6), and an aeration branch pipe 202 is installed at the bottom of the membrane tank 2 to connect with the blower 301; the equipment room 3 is equipped with a blower 301, an inlet pump 302, a product water pump 303, a return pump 304, a backwash water pump 305, an ultraviolet sterilizer 306, a backwash water tank 307, and a PLC control cabinet 308 (Shanghai Jingzhuo Automation Technology Co., Ltd.); each component is connected by pipes and controlled by the PLC control cabinet 308.

[0028] The elastic packing material 102 serves as a microbial carrier, on which various microorganisms (biofilms) adhere, forming multiple microenvironments such as anaerobic, anoxic, and aerobic zones. In aeration tank 1, COD (organic matter), ammonia nitrogen, and total nitrogen in wastewater are converted into carbon dioxide and nitrogen by microorganisms and removed from the water.

[0029] Aeration tank 1 and membrane tank 2 are separated and connected by a connecting hole 104. The mixed liquor in aeration tank 1 enters membrane tank 2 through the connecting hole 104.

[0030] The permeate pump 303 is connected to the permeate port of the membrane module 201 via a pipeline, with a permeate valve installed in the middle; one outlet pipeline of the permeate pump 303 is connected to the backwash water tank 307 via the return valve 311, and the other outlet pipeline is connected to the inlet of the ultraviolet sterilizer 306 via the drain valve 310.

[0031] The mixed liquor in aeration tank 1 enters membrane tank 2. Through the suction of product water pump 303, the clean water in the mixed liquor passes through the membrane pores and enters the product water pipeline.

[0032] The outlet pipe of the 306 UV sterilizer connects to the drain. The sterilized water is discharged from the drain and can be directly discharged or reused for road cleaning, landscaping, etc.

[0033] The inlet of the backwash water pump 305 is connected to the outlet of the backwash water tank 307, and the outlet of the backwash water pump 305 is connected to the permeate pipeline of the membrane module 201. A filter 312 and a backwash valve are installed in sequence in between.

[0034] The backwash water pump 305 automatically turns on at set times. When it turns on, the product water valve is closed and the backwash valve is opened. The clean water in the backwash water tank 307 flows back into the membrane fiber, flushing away the sludge aggregates and microparticles accumulated on the membrane surface.

[0035] The inlet of the reflux pump 304 is connected to the lower part of the membrane tank 2, and the outlet of the reflux pump 304 is connected to the upper part of the aeration tank 1.

[0036] As treated clean water is continuously discharged from membrane module 201, the sludge concentration in membrane tank 2 will gradually increase. Return pump 304 returns the mixed liquor from membrane tank 2 to aeration tank 1.

[0037] Blower 301 aerates the bottom of membrane module 201 and washes the membrane fibers with airflow to reduce the accumulation of sludge particles on the membrane surface.

[0038] The backwash water tank 307 is equipped with a level switch 309 to control the opening of the drain valve 310 and the return valve 311. When the backwash water tank 307 has a high level, the drain valve 310 is open and the return valve 311 is closed; when the backwash water tank 307 has a low level, the drain valve 310 is closed and the return valve 311 is open, ensuring that the backwash water tank 307 has sufficient water for backwashing the membrane module 201.

[0039] A dissolved oxygen probe 105 is installed in aeration tank 1 to monitor the dissolved oxygen concentration in the aeration tank. Blower 301 is a variable frequency blower, which can automatically adjust the blower volume according to the dissolved oxygen concentration to control the dissolved oxygen in aeration tank 1 at a suitable concentration.

[0040] Membrane tank 2 is equipped with a level gauge 203, which is interlocked with the permeate pump 303 to continuously monitor the liquid level of membrane tank 2 / aeration tank 1. When the liquid level is lower than the set value, the permeate pump 303 automatically shuts down to prevent the liquid level in the membrane tank from becoming too low.

[0041] Hydrochloric acid, citric acid, sodium hydroxide, and other chemical agents can be added to the backwash water tank 307 for periodic chemical cleaning of the membrane modules. The cleaning solution is injected into the membrane fibers via the backwash water pump 305 to dissolve and remove inorganic and organic contaminants from the membrane surface. The cleaning process is automatically completed by the PLC control cabinet 308.

[0042] This invention utilizes a device integrated into a 20-foot container to treat glass factory cleaning wastewater, with a treatment capacity of 10t / d. The influent COD is 500mg / L, and the effluent COD is <20mg / L, SS is <5mg / L, and color is less than 30.

Claims

1. An integrated wastewater treatment device, characterized by: The application relates to a containerized membrane bioreactor, which comprises an aeration tank, a membrane tank and a device room integrated in the container, wherein the bottom of the aeration tank is provided with a plurality of aeration discs, the middle of the aeration tank is hung with elastic filler, the aeration tank is connected with a blower through an aeration pipe, the blower provides oxygen required by microorganisms for metabolism through the aeration discs; the membrane tank is provided with a membrane assembly, the bottom of the membrane tank is provided with an aeration branch pipe connected with the blower; the device room is configured with a water inlet pump, a water production pump, a backflow pump, a backwashing water pump, an ultraviolet sterilizer, a backwashing water tank and a PLC control cabinet; the components are connected through pipelines and controlled by the PLC control cabinet.

2. The integrated wastewater treatment device of claim 1, wherein: The aeration tank and the membrane tank are arranged separately and are provided with a communication hole.

3. The integrated wastewater treatment device of claim 1, wherein: The water production pump is connected with a water outlet of the membrane assembly through a pipeline, and a water production valve is arranged in the middle; one pipeline of the water production pump outlet is connected with the backwashing water tank through a backflow valve, and the other pipeline is connected with an inlet of an ultraviolet sterilization device through a drainage valve; and a drainage outlet is connected with an outlet pipeline of the ultraviolet sterilization device.

4. The integrated wastewater treatment device of claim 1, wherein: The backwashing water pump inlet is connected with a water outlet of the backwashing water tank, and the backwashing water pump outlet is connected with a water production pipeline of the membrane assembly, and a filter and a backwashing valve are sequentially arranged in the middle.

5. An integrated wastewater treatment device according to claim 4, wherein: The backwashing water tank is provided with a liquid level switch, which controls the opening and closing of the drainage valve and the backflow valve.

6. The integrated wastewater treatment device of claim 1, wherein: The aeration tank is provided with a dissolved oxygen probe, and the blower is a variable frequency blower, which automatically adjusts the air volume according to the dissolved oxygen concentration.

7. The integrated wastewater treatment device of claim 1, wherein: The membrane tank is provided with a liquid level meter, which is interlocked with the water production pump; when the liquid level is lower than a set value, the water production pump is automatically turned off.

Images