First, let's understand its concept. A large number of sewage strains were artificially screened as high-quality strains, and then through a series of domestication and culture, the sewage treatment strains with salt tolerance, impact resistance and strong stability were obtained. Only such microbial strains can be used for sewage treatment.
There are four common sewage treatment bacteria, namely nitrifying bacteria, denitrifying bacteria, compound sewage treatment bacteria and COD degrading bacteria.
Nitrifying bacteria is an aerobic bacteria, which exists in aerobic tank or contact oxidation tank, and mainly converts ammonia nitrogen in wastewater into nitrate. Denitrifying bacteria and nitrifying bacteria are good "partners", which can denitrify the mixed liquid returned from aerobic tank.
The compound strain mainly deals with the start-up of new sewage system, helps the sewage biochemical pool to quickly cultivate microbial strains, and has the function of degrading COD, BOD, ammonia nitrogen and total nitrogen. It has strong adaptability, strong impact resistance and good stability, and has certain removal ability for complex industrial wastewater. After domestication, the salt tolerance of the strain can reach 2%.
Finally, COD-degrading bacteria are mainly used in biochemical tanks, which have four common functions, namely, improving the removal rate of COD, improving the stability of the treatment system, improving the impact resistance and shortening the debugging or restart period.