Membrane Bioreactor

In the field of sewage treatment and water resource reuse, MBR, also known as membrane bioreactor, is a new type of water treatment technology that combines activated sludge method and membrane separation technology. There are many types of membranes, which are classified according to the separation mechanism, including reactive membranes, ion exchange membranes, permeable membranes, etc.; According to the nature of the membrane, there are natural membranes (biological membranes) and synthetic membranes (organic membranes and inorganic membranes); According to the structural type of the membrane, there are flat type, tubular type, spiral type and hollow fiber type.

Compared to many traditional biological water treatment processes, MBR has the following key features:

1. The effluent quality is of high quality and stable

Due to the efficient separation effect of the membrane, the separation effect is much better than that of the traditional sedimentation tank, the treated effluent is extremely clear, the suspended solids and turbidity are close to zero, bacteria and viruses are greatly removed, and the effluent quality is better than the domestic miscellaneous water quality standard (CJ25.1-89) issued by the Ministry of Construction, and can be directly reused as non-potable municipal miscellaneous water.

At the same time, the membrane separation also enables the microorganisms to be completely intercepted in the bioreactor, so that the system can maintain a high concentration of microorganisms, which not only improves the overall removal efficiency of the reactor to pollutants and ensures good effluent quality, but also the reactor has good adaptability to various changes in the influent load (water quality and quantity), is resistant to impact load, and can stably obtain high-quality effluent quality.

Second, the output of residual sludge is small

The process can be operated at high volumetric loads, low sludge loads, and low residual sludge production (theoretically zero sludge discharge can be achieved), reducing sludge treatment costs.

3. It occupies a small area and is not limited by the setting occasion

The bioreactor can maintain a high concentration of microbial biomass, the volume load of the treatment device is high, and the floor space is greatly saved; The process flow is simple, compact structure, covers an area of saving, is not limited by the installation site, is suitable for any occasion, and can be made into ground, semi-underground and underground.

Fourth, it can remove ammonia nitrogen and refractory organic matter

Since the microorganisms are completely intercepted in the bioreactor, which facilitates the retention and growth of slow-proliferating microorganisms such as nitrifying bacteria, the nitrification efficiency of the system is improved. At the same time, the hydraulic retention time of some refractory organic compounds in the system can be increased, which is conducive to the improvement of the degradation efficiency of refractory organic compounds.

Fifth, the operation and management are convenient, and it is easy to realize automatic control

The process realizes the complete separation of hydraulic retention time (HRT) and sludge retention time (SRT), and the operation control is more flexible and stable.

Sixth, it is easy to transform from traditional processes

This process can be used as an advanced treatment unit for traditional sewage treatment, and has broad application prospects in the advanced treatment of effluent from urban secondary sewage treatment plants (so as to realize the reuse of a large amount of urban sewage).