sewage treatment process description

sewage treatment process

sewage treatment process is a variety of economic, reasonable, scientific and effective process methods for urban domestic sewage and industrial wastewater. Sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical care, catering and other fields. Urban sewage treatment technology should be optimized after comprehensive technical and economic comparison according to the treatment scale, water quality characteristics, environmental functions of receiving water bodies and local actual conditions and requirements.

Classification according to common sewage treatment methods

Physical method: physical or mechanical separation process. Chemical methods such as filtration, precipitation, centrifugal separation, floating, etc.

: the transformation process in which chemical substances are added to react with harmful substances in sewage. Neutralization, oxidation, reduction, decomposition, coagulation, chemical precipitation, etc.

Physical and chemical methods: the separation process of physical chemistry. Biological methods such as stripping, stripping, adsorption, extraction, ion exchange, electrolytic electrodialysis, reverse osmosis, etc.

: the metabolic process in which microorganisms oxidize and decompose organic matter in sewage. Chemical classification of activated sludge, biofilter, biological rotary table, oxidation pond, anaerobic digestion, etc.

Coagulation

Adding electrolyte to colloidal turbid liquid to coagulate colloidal substances in water to separate them from water

Coagulants include oily wastewater such as aluminum sulfate, alum, polyaluminum chloride, ferrous sulfate and ferric chloride, dyeing wastewater, gas station wastewater and so on.