MBR System

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The MBR sewage treatment system usually consists of three parts: a regulating tank, a biological aeration tank, and a clean water tank. The sewage is removed from large particle impurities through a grille and enters the regulating tank. It is lifted by a sewage lifting pump and enters the facultative reaction tank to remove ammoniacal nitrogen. (When the ammonia nitrogen content in the sewage is relatively high, it is recommended to use a facultative reaction tank. Optional) Then, it enters the membrane biological aeration tank. In the membrane bioreactor, the organic pollutants in the sewage are degraded by microorganisms to generate water with COD up to standard, and then the water treated by the separation membrane with a large number of micropores on the surface is separated from the microorganisms in the pool. The reclaimed water obtained after treatment is stored in the middle water tank. In addition to being reused, the reclaimed water in the middle water tank is also used for backwashing of the membrane module. In order to prevent the growth of algae and bacteria, a small amount of reagent should be regularly put into the middle water tank.

It should be calculated according to the residence time and the BOD volume load respectively, and the larger value should be taken. Generally, when treating domestic sewage, the residence time is 4 to 6 hours; the BOD volume load is 1.2 kg/(m^3·d); when treating other high-concentration organic wastewater, various parameters need to be determined through experiments. When requiring denitrification and dephosphorization, in addition to considering BOD, the residence time required for denitrification and dephosphorization should also be considered.

When setting up membrane modules in the MBR membrane pool, the planar configuration is to ensure that the activated sludge mixed liquid in the MBR membrane pool can generate a uniform circulating flow. The planar layout of the MBR membrane components should be located as close to the center of the MBR membrane pool as possible, and ensure sufficient distance in front, back, left and right. Ensure a distance of more than 300m in front, back, left and right of the MBR membrane box; the distance between the top of the MBR membrane box and the water surface (minimum water level) should be at least 500mm.

1.Keep the following parameter records: