Sewage treatment process

Sewage treatment is the process of purifying the sewage to meet the water quality requirements for drainage or reuse. Sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical treatment, catering and other fields, and more and more people's daily life. Modern sewage treatment is divided into primary treatment, secondary treatment and tertiary treatment. The primary treatment mainly removes the suspended solid pollutants in the sewage. Most of the physical treatment methods can only meet the requirements of the primary treatment. After the first level treatment, BOD can be removed by about 30%, which can not meet the discharge standard. The primary treatment belongs to the pretreatment of the secondary treatment. The secondary treatment mainly removes the colloidal and dissolved organic pollutants (BOD and COD) in the sewage, with a removal rate of more than 90%, so that the organic pollutants can meet the discharge standards. Tertiary treatment, further treatment of refractory organic matter, nitrogen, phosphorus and other soluble inorganic matter that can lead to eutrophication of water body. The main methods include biological nitrogen and phosphorus removal, coagulation sedimentation, sand filtration, activated carbon adsorption, ion exchange and electroosmotic analysis. The biological filler produced by Shanghai Guoyun environmental protection materials Co., Ltd. is an ideal product for secondary treatment of sewage. In the field of sewage treatment, it is mainly used for contact oxidation process. Microorganisms will accumulate on the surface of the filler to increase the surface contact with sewage and reduce the degradation of sewage. Product advantages: larger surface area, surface area * * up to 3.5 × 105m2/m3； the filling rate is significantly reduced, only 10% - 30%, while the filling rate of other suspended fillers is 30% - 65%; microporous and coarse pore foams have strong surface adsorption capacity and water absorption; easy to hang film, and microorganisms can reproduce and grow in the carrier within two hours; The effluent quality has been stable within 3 weeks, while it takes 2 months to use other fillers; add substances that can effectively absorb toxic substances and inhibit degradation to protect biofilm; better nitrification and denitrification effect and stronger nitrogen removal capacity adjustable density, sedimentation speed, live load and conductivity; compared with other fillers, the energy consumption of fluidized bed is significantly reduced.