Analyze the principle of mbr membrane wastewater treatment technology

Release Date:

2024-03-28

Source:


MBR Membrane wastewater treatment technology, full name "membrane Bio-Reactor" technology, is an innovative and efficient wastewater treatment solution that cleverly combines traditional biological treatment processes with advanced membrane separation technology. The purpose is to realize the efficient purification and resource utilization of urban sewage, industrial wastewater and other types of sewage.

Daltonen MBR

First, basic principles
1. Biological treatment process
The core of the MBR system is a bioreactor containing activated sludge. In this reactor, by artificially controlling conditions such as temperature, dissolved oxygen, pH, and nutrient ratios, microbial populations are able to multiply and form biofloc. These microbial communities have strong biodegradability, they are able to engulf and metabolize organic pollutants in sewage such as carbohydrates, proteins, fats and other biodegradable substances, converting these organic matter into simple harmless substances such as carbon dioxide, water and the microbial cells themselves.

2. Membrane separation process
Another key component in MBR systems is the membrane assembly, which is usually composed of hollow fiber membranes or multi-channel flat membranes made of materials such as polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE). These membranes have very small pore sizes, generally between 0.01 and 0.4 microns, enabling efficient retention of suspended matter, bacteria, and even some viruses in the mixture.

In the bioreactor, the membrane component is placed under the activated sludge layer, and when the wastewater passes through the membrane component, the water molecules can freely pass through the membrane pores, while the activated sludge and most of the pollutants are blocked on one side of the membrane. In this way, the membrane separation process not only completes the effective interception of microbial floc, ensures the stable existence of high-concentration microorganisms in the bioreactor, but also realizes the fine filtration of the effluent, making the effluent quality reach a very high standard, and the suspended matter and turbidity are almost zero, while greatly removing pathogenic microorganisms and difficult to degrade organic matter.

3. Aeration and backwashing
In order to ensure the normal operation of the membrane components, on the one hand, it is necessary to continuously supply oxygen to the bioreactor to maintain the activity and growth of microorganisms, that is, the aeration process. On the other hand, after the membrane module runs for a long time, the surface of the activated sludge and other substances will gradually accumulate, affecting the membrane flux, at this time, it is necessary to use regular backwashing operation, the use of compressed air or clean water to wash the membrane surface, remove the blockage, and restore the separation performance of the membrane.

Second, core advantages
High efficiency separation: MBR membrane has extremely high precision separation capability, significantly improving effluent quality, so that the treated water can be directly reused or discharged into a protected water body.

High biological concentration: In the bioreactor, due to the interception of the membrane, microorganisms can grow in a high concentration state, which improves the biochemical reaction rate and organic matter removal efficiency, and is also conducive to the biological nitrogen removal process such as nitrification and denitrification.

Small footprint: Compared with the traditional activated sludge method, the MBR process is compact and occupies less land, which is especially suitable for urban areas where land resources are tight.

Low sludge yield: The MBR process can better control the age of the sludge, thereby reducing the residual sludge yield and reducing the cost and environmental pressure of subsequent sludge treatment.

Effluent stability: Due to the continuity and stability of membrane separation, the effluent quality of MBR process is stable and not affected by external factors.

3. Practical application
MBR technology is widely used in municipal sewage treatment, industrial wastewater treatment (such as chemical, pharmaceutical, food processing and other industries produced wastewater), residential sewage treatment, rainwater collection and treatment, especially in those who have strict requirements for effluent quality and hope to achieve recycling of water resources, MBR membrane wastewater treatment technology has shown an irreplaceable value.

MBR membrane wastewater treatment technology with its unique combination of biological and physical treatment, overcoming some limitations of traditional wastewater treatment process, to achieve efficient, stable, high-quality wastewater treatment effect, has become an important development direction in the field of modern wastewater treatment. With the continuous progress of membrane material science and membrane technology research and development, the application scope and treatment efficiency of MBR technology will continue to improve, making important contributions to global environmental protection and sustainable use of water resources.

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