MBBR wastewater treatment

From many years of operation practice, although the activated sludge process is relatively mature, but there are also many shortcomings and the insufficiency, such as the aeration tank volume, covers an area of high and high construction cost, and adaptability to the changes of water quality and quantity is low, running effect is affected by the change of water quality and quantity, etc. In view of the above factors, this sewage treatment method is gradually replaced by the later biofilm method. Biological membrane method to make up for the activated sludge process a lot of disadvantages, such as its stability, bear ability of organic load and hydraulic load impact, no sludge expansion, no reflow, high removal rate of organic matter, the reactor volume small, the sewage treatment plant cover an area of an area small, etc. But biological membrane method has its defects, such as biological filter in the filter material, easy to jam, need periodic backwash, at the same time, fixed packing, and packing under aeration equipment replacement is relatively difficult, biological carrier particles in the fluidized bed reactor can only play a role in the fluidized state, process stability is poor... And so on. With the disadvantages and disadvantages of the above two processes, the moving bed biofilm reactor (MBBR) has emerged.

MBBR method in the late 80 s are introduced and applied in Europe soon, it absorbed the traditional activated sludge process and biological contact oxidation process and the advantages of both become a new and efficient composite processing method. Its core part is close to the water of suspended packing directly adding proportion to aeration pool as the activity of microorganism carrier, relying on the aeration tank within the raise and the aeration and water in a fluidized state, when microbial adhesion on the carrier, the carrier of floating in reactor with the cyclotron flip effect of mixture move freely, so as to achieve the goal of wastewater treatment.

As suspended growth of activated sludge process and growth of biofilm method of a kind of process, the method of MBBR is both advantages: less land -- the same load conditions it need ordinary oxidation pond only 20% of the volume; The microorganism attaches to the carrier and flows with the flow of water so it does not need to be activated sludge backflow or recycle backwash; The carrier organism keeps falling off, avoiding blocking; High organic load and strong impact load, so the water quality is stable. Small loss of head loss, low power consumption, simple operation, easy operation and management; It is also suitable for renovation project.

Sharply with the process of modern industry and population expansion, water pollution has become a social focus, one of the current sewage treatment methods mainly include method of activated sludge process and biofilm two broad categories: activated sludge process from the beginning of the 20th century Britain since its inception, after decades of development innovation has a variety of operation mode, at the same time, due to its excellent sewage treatment effect gradually becomes more mature technology of recognition; Biofilm method is a kind of process that USES the living organisms to purify the water body. In recent years, it has been developed and improved rapidly.

In the past more than ten years of study, method of MBBR has as a mature technology widely used in papermaking wastewater, food industry wastewater, slaughter wastewater, industrial wastewater, such as oil refining wastewater, but also can deal with city life sewage, and urban mixed sewage wastewater and industrial wastewater. Many engineering examples show that MBBR method is effective in treating sewage.