Background and Advantages of MBBR process
The activated sludge method is relatively mature, but it also has many shortcomings:
Large aeration tank, large area, high infrastructure cost
The water volume is low, and the operation effect is easily affected by changes in water quality and water volume.
In view of the above factors, this sewage treatment method was gradually replaced by the later biofilm method.
The biofilm method makes up for many shortcomings of the activated sludge method:
Good stability, strong ability to bear organic load and hydraulic load
No sludge expansion, no backflow, high removal rate of organic matter
Small reactor volume and small footprint
However, the biofilm method also has its unique disadvantages:
The filter material in the biological filter is easy to block and needs to be backwashed regularly
Fixed packing and difficult to replace the aeration equipment under the packing
The carrier particles in the biological fluidized bed reactor can only operate in a fluidized state, and the process stability is poor
Due to the shortcomings and deficiencies of the above two processes, the moving bed biofilm reactor (MBBR) came into being.
The MBBR method was introduced in the late 1980s and quickly applied in Europe.
Absorb the advantages of traditional activated sludge method and biological contact oxidation method, and become a new and efficient composite process treatment method.
The core part is to rely on the aeration in the aeration tank and the lifting effect of the water flow in the fluidized state, and the suspended filler with a specific gravity close to water is directly added to the aeration tank as an active carrier for microorganisms. When microorganisms are attached to the carrier, the floating carrier moves freely in the reactor under the action of the vortex and overturn of the mixed liquid, so as to achieve the purpose of sewage treatment
In the past ten years of research, the MBBR method has been widely used as a mature process in papermaking wastewater, food industry wastewater, slaughter wastewater, oil refining wastewater and other industrial wastewater. It can also treat urban domestic sewage, urban wastewater and industrial wastewater. Waste water mixed with sewage. Many engineering examples show that the MBBR method has a good effect on sewage treatment.
The MBBR process advantages
Packaging features
Filler is mainly made of polyethylene, polypropylene and modified materials, polyurethane foam, etc. specific gravity is close to water, mainly cylindrical and spherical, easy to hang the film, not agglomerate, not clogged, and easy to remove the film.
Good denitrification ability
A good nutrient, anoxic, and the anaerobic environment is formed on the packing, and nitrification and denitrification reactions can occur in one reactor, which has a good effect on the removal of ammonia nitrogen.
Good effect of removing organic matter
The sludge concentration in the reactor is relatively high, and the general sludge concentration is 5-10 times that of the ordinary activated sludge method, which can be as high as 30-40g/L. Improve the efficiency of organic treatment, and strong impact load resistance.
Easy to maintain and manage
There is no need to set filler brackets in the aeration tank, which facilitates the maintenance of the filler and the aeration device at the bottom of the tank, while saving investment and floor space.
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