Sewage treatment system based on membrane bioreactor

Abstract

The invention discloses a sewage treatment system based on a membrane bioreactor, which comprises a primary treatment unit used for removing large particles and suspended matters in sewage; the membrane bioreactor unit is used for removing organic pollutants and nitrogen and phosphorus substances in sewage by combining a membrane separation technology and a biodegradation technology, and comprises a biological reaction tank and a membrane filtration unit, the biological reaction tank provides an environment for microorganism growth and metabolism, and the membrane filtration unit provides a membrane filtration unit; the membrane filtration unit is used for separating reacted water from membrane pollutants through a membrane separation technology; the membrane cleaning unit is used for regularly cleaning the membrane filtering unit; according to the sewage treatment system based on the membrane bioreactor, pollutants such as organic matters, nitrogen and phosphorus in water can be efficiently removed by utilizing the synergistic effect of a membrane separation technology and biological treatment, the treated water is ensured to reach a reclaimed water standard, and the problems of membrane pollution, cleaning difficulty and low energy efficiency in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a sewage treatment system based on a membrane bioreactor. BACKGROUND

[0002] With the acceleration of industrialization and urbanization, water resource shortage and water pollution problems are becoming increasingly serious. Traditional sewage treatment technology, especially activated sludge method, has problems such as large occupation area, low treatment efficiency, and sludge treatment difficulty. At the same time, membrane filtration technology, as a high-efficiency separation technology, can effectively remove particles, suspended solids, bacteria and harmful substances in water, and has been widely used in water treatment field.

[0003] Membrane bioreactor combines membrane separation technology and biological treatment technology, and can efficiently remove pollutants in water in a small space, so it is one of the key technologies in recent years. However, the existing membrane bioreactor technology still faces challenges such as membrane pollution, membrane cleaning difficulty and unstable system operation in practical application, so a new sewage treatment system based on membrane bioreactor is needed to improve the use efficiency of membrane, reduce maintenance cost and ensure long-term stable operation. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the existing defects and provide a sewage treatment system based on a membrane bioreactor, which utilizes the synergistic effect of membrane separation technology and biological treatment to efficiently remove organic matter, nitrogen and phosphorus pollutants in water, and ensures that the treated water meets the reclaimed water standard, solves the problems of membrane pollution, cleaning difficulty and low energy efficiency in the prior art, has higher operation efficiency and stability, and can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a sewage treatment system based on a membrane bioreactor, comprising:

[0006] A primary treatment unit for removing larger particles and suspended solids in sewage;

[0007] A membrane bioreactor unit for removing organic pollutants, nitrogen and phosphorus substances in sewage by combining membrane separation technology and biodegradation technology, comprising a biological reaction tank and a membrane filtration unit, the biological reaction tank provides an environment for microbial growth and metabolism, and the membrane filtration unit separates the reacted water from membrane pollutants by membrane separation technology;

[0008] A membrane cleaning unit for periodically cleaning the membrane filtration unit;

[0009] A water quality monitoring system for real-time monitoring of water quality parameters in sewage, collecting data through sensors and transmitting to a central control system;

[0010] The central control system is used to analyze water quality data and adjust the working status of the membrane bioreactor based on feedback results, automatically adjusting the working pressure, flow rate, reaction time and aeration intensity of the membrane filtration unit.

[0011] Reclaimed water storage tank is used to store treated reclaimed water;

[0012] The recycled water delivery system transports stored recycled water to where it is needed.

[0013] As a preferred embodiment of the present invention, the membrane bioreactor unit adopts integrated membrane bioreactor technology, and the membrane filtration unit is integrated with the bioreactor.

[0014] As a preferred embodiment of the present invention, the membrane filtration unit uses an ultrafiltration membrane with a pore size of 0.01 to 0.1 μm.

[0015] As a preferred embodiment of the present invention, the membrane filtration unit further includes a reverse osmosis membrane for removing dissolved pollutants, heavy metal ions, and other trace harmful substances from the water.

[0016] As a preferred embodiment of the present invention, the membrane cleaning unit includes:

[0017] Backwashing device, used to remove particulate matter from the membrane surface by high-pressure backwashing water flow;

[0018] Chemical cleaning equipment is used to periodically add chemical cleaning agents to the membrane filtration unit to dissolve and remove organic pollutants from the membrane surface;

[0019] Physical cleaning devices remove contaminants adhering to membrane filtration units using mechanical methods.

[0020] As a preferred technical solution of the present invention, the water quality monitoring system includes multiple sensors, which collect water quality parameters such as turbidity, ammonia nitrogen, dissolved oxygen, pH value, and temperature in real time, and transmit the data to the central control system in real time.

[0021] As a preferred embodiment of the present invention, the recycled water storage tank is equipped with a water level sensor to monitor water level changes in real time and cooperate with the recycled water delivery system to automatically adjust the water supply.

[0022] As a preferred embodiment of the present invention, the recycled water delivery system includes regulating valves and pump sets, which are used to automatically adjust the water flow rate according to the recycled water demand, so as to ensure the stable operation of the system and the timely supply of recycled water.

[0023] A wastewater treatment method based on a membrane bioreactor includes the following steps:

[0024] S1: Input the raw wastewater into the primary treatment unit to remove larger suspended solids and impurities;

[0025] S2: The primary treated wastewater is sent to the membrane bioreactor unit, where organic pollutants are degraded by microorganisms in the bioreactor tank, and fine particles, microorganisms and dissolved pollutants are separated by the membrane filtration unit;

[0026] S3: Regularly clean the membrane filter unit using backwashing, chemical cleaning, and physical cleaning methods to reduce membrane fouling and extend membrane life;

[0027] S4: Monitor water quality in real time through the water quality monitoring system and feed the monitoring data back to the central control system;

[0028] S5: Automatically adjusts the operating parameters of the membrane bioreactor, such as water flow rate, aeration rate and reaction time, based on water quality monitoring data to optimize treatment effect;

[0029] S6: The treated reclaimed water is transported to the reuse water storage tank for subsequent use, and reused water is provided as needed through the reuse water delivery system.

[0030] Compared with the prior art, the beneficial effects of the present invention are: (1) High efficiency in removing pollutants. By combining membrane bioreactor with membrane filtration and biological treatment technology, it can efficiently remove pollutants such as organic matter, nitrogen and phosphorus from water, and the treated water quality meets the strict standards for reclaimed water; (2) Space saving. Membrane bioreactor technology effectively reduces the system's footprint, and is especially suitable for places with limited land resources; (3) High membrane cleaning efficiency. Through multiple cleaning methods such as backwashing, chemical cleaning and physical cleaning, the service life of the membrane is extended and a high treatment efficiency is maintained; (4) Through the closed-loop control of the water quality monitoring system and the central control system, the system's automated operation is realized, reducing manual intervention and maintenance costs; (5) Water reuse. The system can realize the efficient reuse of sewage, reducing the demand for fresh water resources and having significant water resource saving benefits. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the system structure.

[0032] Figure 2 This is a plan view of a membrane bioreactor unit;

[0033] Figure 3 This is a plan view of the membrane cleaning unit;

[0034] Figure 4 This is a flowchart of the processing steps of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1-3 The present invention provides a technical solution: a wastewater treatment system based on a membrane bioreactor, comprising a primary treatment unit, a membrane bioreactor unit, a membrane cleaning unit, a water quality monitoring system, a central control system, a reclaimed water storage tank, and a reclaimed water transportation system;

[0037] The primary treatment unit consists of a screen and a sedimentation tank, which is used to remove large suspended solids, impurities and grease from wastewater. The primary treatment unit can reduce the load on the membrane bioreactor unit and improve the treatment efficiency of subsequent treatment units.

[0038] The membrane bioreactor unit includes a biological reaction tank and a membrane filtration unit, which are designed as an integrated unit. In the biological reaction tank, microorganisms degrade organic pollutants in wastewater. During the biodegradation process, nutrients such as nitrogen and phosphorus in the wastewater are removed, resulting in a significant reduction in chemical oxygen demand (COD) and biochemical oxygen demand (BOD). The membrane filtration unit uses ultrafiltration or reverse osmosis membranes with a membrane diameter of 0.01–0.1 μm, which can effectively remove microorganisms, fine particles, and other pollutants from the water.

[0039] The membrane cleaning unit includes a backwashing device, a chemical cleaning device, and a physical cleaning device. The backwashing device uses high-pressure water to periodically backwash the membrane surface to remove suspended solids and organic matter. The chemical cleaning device is used to periodically add chemical cleaning agents to the membrane surface to dissolve and remove organic pollutants. The physical cleaning device removes stubborn pollutants from the membrane surface through ultrasonic waves or mechanical vibration.

[0040] The water quality monitoring system consists of multiple online sensors that monitor key parameters in the water in real time, such as turbidity, ammonia nitrogen, dissolved oxygen, pH, and temperature. When water quality parameters become abnormal, the system will automatically alarm and adjust operating parameters. For example, when the ammonia nitrogen concentration is too high, the central control system will automatically increase the aeration rate or add chemical agents for treatment.

[0041] The central control system is linked to the water quality monitoring system to acquire and analyze water quality data in real time, and adjust various parameters in the wastewater treatment process. The central control system can automatically adjust operating parameters such as the flow rate of the membrane filtration unit, the working pressure of the membrane, and the aeration rate of the reaction tank according to changes in water quality to ensure optimal treatment results.

[0042] The system includes a recycled water storage tank and a recycled water delivery system. The treated water is sent to the recycled water storage tank for storage. The storage tank is equipped with a water level sensor to monitor the water level in real time. The water flow is controlled by adjusting valves and pump sets to ensure the stable operation of the system and the timely supply of recycled water, and to deliver the recycled water to the point of use.

[0043] like Figure 4 A wastewater treatment method based on a membrane bioreactor includes the following steps:

[0044] S1: Input the raw wastewater into the primary treatment unit to remove larger suspended solids and impurities;

[0045] S2: The primary treated wastewater is sent to the membrane bioreactor unit, where organic pollutants are degraded by microorganisms in the bioreactor tank, and fine particles, microorganisms and dissolved pollutants are separated by the membrane filtration unit;

[0046] S3: Regularly clean the membrane filter unit using backwashing, chemical cleaning, and physical cleaning methods to reduce membrane fouling and extend membrane life;

[0047] S4: Monitor water quality in real time through the water quality monitoring system and feed the monitoring data back to the central control system;

[0048] S5: Automatically adjusts the operating parameters of the membrane bioreactor, such as water flow rate, aeration rate and reaction time, based on water quality monitoring data to optimize treatment effect;

[0049] S6: The treated reclaimed water is transported to the reuse water storage tank for subsequent use, and reused water is provided as needed through the reuse water delivery system.

[0050] This invention optimizes membrane cleaning, automated control, and water quality monitoring functions, which can effectively improve membrane efficiency, reduce maintenance costs, ensure long-term stable operation of the system, and ensure that the treated water meets the standards for reclaimed water.

[0051] The parts of the invention not described in detail are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment system based on a membrane bioreactor, characterized in that: include: The primary treatment unit is used to remove larger particulate matter and suspended solids from wastewater; A membrane bioreactor unit is used to remove organic pollutants and nitrogen and phosphorus substances from wastewater by combining membrane separation technology and biodegradation technology. It includes a biological reaction tank and a membrane filtration unit. The biological reaction tank provides an environment for the growth and metabolism of microorganisms, and the membrane filtration unit is used to separate the water after the reaction from the membrane pollutants through membrane separation technology. Membrane cleaning unit, used for periodically cleaning membrane filter units; The water quality monitoring system monitors water quality parameters in wastewater in real time and collects data through sensors and transmits it to the central control system. The central control system is used to analyze water quality data and adjust the working status of the membrane bioreactor based on feedback results, automatically adjusting the working pressure, flow rate, reaction time and aeration intensity of the membrane filtration unit. Reclaimed water storage tank is used to store treated reclaimed water; The recycled water delivery system transports stored recycled water to where it is needed.

2. The wastewater treatment system based on a membrane bioreactor according to claim 1, characterized in that: The membrane bioreactor unit adopts integrated membrane bioreactor technology, and the membrane filtration unit is integrated with the bioreactor.

3. The wastewater treatment system based on a membrane bioreactor according to claim 1, characterized in that: The membrane filtration unit uses an ultrafiltration membrane with a pore size of 0.01–0.1 μm.

4. The wastewater treatment system based on a membrane bioreactor according to claim 1, characterized in that: The membrane filtration unit also includes a reverse osmosis membrane for removing dissolved pollutants, heavy metal ions, and other trace harmful substances from the water.

5. A wastewater treatment system based on a membrane bioreactor according to claim 1, characterized in that: The membrane cleaning unit includes: Backwashing device, used to remove particulate matter from the membrane surface by high-pressure backwashing water flow; Chemical cleaning equipment is used to periodically add chemical cleaning agents to the membrane filtration unit to dissolve and remove organic pollutants from the membrane surface; Physical cleaning devices remove contaminants adhering to membrane filtration units using mechanical methods.

6. A wastewater treatment system based on a membrane bioreactor according to claim 1, characterized in that: The water quality monitoring system includes multiple sensors that collect water quality parameters such as turbidity, ammonia nitrogen, dissolved oxygen, pH value, and temperature in real time, and transmit the data to the central control system in real time.

7. A wastewater treatment system based on a membrane bioreactor according to claim 1, characterized in that: The recycled water storage tank is equipped with a water level sensor to monitor water level changes in real time and, in conjunction with the recycled water delivery system, automatically adjusts the water supply.

8. A wastewater treatment system based on a membrane bioreactor according to claim 1, characterized in that: The reclaimed water delivery system includes regulating valves and pump sets, which are used to automatically adjust the water flow according to the reclaimed water demand, so as to ensure the stable operation of the system and the timely supply of reclaimed water.

9. A wastewater treatment method based on a membrane bioreactor, characterized in that: Includes the following steps: S1: Input the raw wastewater into the primary treatment unit to remove larger suspended solids and impurities; S2: The primary treated wastewater is sent to the membrane bioreactor unit, where organic pollutants are degraded by microorganisms in the bioreactor tank, and fine particles, microorganisms and dissolved pollutants are separated by the membrane filtration unit; S3: Regularly clean the membrane filter unit using backwashing, chemical cleaning, and physical cleaning methods to reduce membrane fouling and extend membrane life; S4: Monitor water quality in real time through the water quality monitoring system and feed the monitoring data back to the central control system; S5: Automatically adjusts the operating parameters of the membrane bioreactor, such as water flow rate, aeration rate and reaction time, based on water quality monitoring data to optimize treatment effect; S6: The treated reclaimed water is transported to the reuse water storage tank for subsequent use, and reused water is provided as needed through the reuse water delivery system.

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