The application and advantages of MBR in the papermaking wastewater treatment

Membrane Bioreactor (MBR) is a new type of water treatment technology which combines ceramic membrane separation unit and biological treatment unit. Membrane module is used to replace secondary sedimentation tank for keeping high activated sludge concentration in the bioreactor. It can reduce the land occupation of sewage treatment facilities, and decrease the sludge amount by keeping low sludge load. Compared with the traditional biochemical water treatment technology, the main characteristics of MBR are as below:

(1) High quality and stable effluent quality

Due to the high efficiency of membrane separation, the separation effect is far better than that of the traditional sedimentation tank. The treated water is extremely clear. The suspended solids and turbidity are close to zero, and bacteria and viruses are largely removed. At the same time, the membrane separation also enables the microorganisms to be completely intercepted in the MBR tank, so that the system can maintain a higher concentration of microorganisms, which improves the overall removal efficiency of pollutants in the reaction device, and ensures the overall removal efficiency of pollutants. The reactor has a good adaptability to various changes of the influent load (water quality and water quantity). It is resistant to impact load and can stably obtain high quality effluent water quality.

(2) Less excess sludge production

The process can be operated under high volume load and low sludge load, with low excess sludge output and low sludge treatment cost.

(3) Small floor area, not limited by setting occasions

The bioreactor can maintain a high concentration of microorganisms, with a high volume load of the treatment device and a large area saving; the process flow is simple, and compac, which is not limited by the location, suitable for any occasion. And also it can be made into ground, semi underground and underground.

(4) Removal of ammonia nitrogen and refractory organics

It is conducive to the interception and growth of slow-growing microorganisms such as nitrifying bacteria because the microorganism is completely intercepted in the MBR tank, and the nitrification efficiency of the system can be improved. At the same time, the HRT of some refractory organic compounds can be increased in the system, which is helpful to improve the degradation efficiency of refractory organic compounds.

(5) Convenient operation and management, easy to realize automatic control

The process realizes the complete separation of HRT and SRT, and the operation control is more flexible and stable. It is a new technology easy to realize the equipment in sewage treatment. It can realize the microcomputer automatic control, thus making the operation management more convenient.