Sewage treatment refers to the process of purifying sewage in order to make it reach the water quality requirements for draining a certain body of water or for re-use. According to the source of sewage classification, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production of sewage, including industrial sewage, agricultural sewage and medical sewage, etc., and living sewage is the sewage generated by daily life, refers to various forms of inorganic and organic matter of the complex mixture of integrated living sewage treatment equipment
Commonly used processes include two categories: biofilm method and activated sludge method. Specific use of the process: biofilm method: biological rotor, contact oxidation, anaerobic biofilter. Activated sludge method: aeration method, oxidation ditch method, AB method, AO method, A2O process, etc