1, sewage primary treatment mechanical treatment (pretreatment stage), treatment of coarse and fine grating, sand sedimentation tanks, primary sedimentation tanks, air-floatation tanks, regulating pool. The role of the regulator: in order to ensure the normal operation of subsequent treatment structures or equipment, the amount of water and water quality of sewage needs to be adjusted. Acidic sewage and alkaline sewage mixed in the regulating tank, can achieve the purpose of neutralization. Short-term discharge of high-temperature sewage can also be used to regulate the way to balance the water temperature.
2, sewage secondary treatment, activated sludge method. Activated sludge degradation of organic matter is mainly carried out in the aeration stage, which can be divided into two stages, adsorption stage and stabilization stage. In the adsorption stage, mainly sewage organic matter transferred to the activated sludge up, this is due to the activated sludge has a huge specific surface area, and the surface contains polysaccharide viscous substances. In the stabilization stage, the organic matter transferred to the activated sludge is mainly used by microorganisms.
3, tertiary treatment methods include: sand filtration, coagulation, microfiltration, reverse osmosis, electrodialysis, ionization, disinfection, activated carbon adsorption, denitrification and phosphorus removal.