Microorganisms can be used in domestic sewage treatment to make the wastewater dissolved

Biological treatment of domestic sewage: the use of microbial metabolism to make the dissolved, colloidal state of organic pollutants in sewage into a stable harmless material treatment method.

 

It can be divided into two categories: aerobic oxidation by aerobic microorganism and anaerobic reduction by anaerobic microorganism. Aerobic oxidation process is widely used in the treatment of urban sewage, mainly including activated sludge process (oxidation ditch, aeration tank, etc.), biofilm process (biological turntable, biological filter, contact oxidation, etc.); anaerobic reduction process mainly includes anaerobic pond, anaerobic digestion tank of sludge, etc.

Physical treatment method of domestic sewage treatment: the treatment method of separating suspended solid pollutants in sewage by physical action, mainly including screen filtration method (grid, screen mesh), sedimentation method (grit chamber, sedimentation tank), air flotation method, filtration method (fast filter, slow filter, etc.) and reverse osmosis method (organic polymer semi permeable membrane), etc.; chemical treatment method: separating sewage by chemical reaction The treatment methods of pollutants in water mainly include neutralization, electrolysis, redox and electrodialysis, gas stripping, adsorption, stripping and extraction.