Water Treatment Process

Water treatment process is an economic, reasonable, scientific and effective process for urban domestic sewage water and industrial wastewater.

Common Water Treatment Process

Physical Process: Physical or mechanical separation process.Including Filtering, Sedimentation, Centrifugal Separation, Floating, etc

Chemical Process: Conversion process in which chemical substances are added to react with harmful substances in sewage. Including  Neutralization, Oxidation, Reduction, Decomposition, Coagulation, Chemical Precipitation, etc

Physicochemical Process: Physical and chemical separation process. Including Air Stripping, Stripping, Adsorption, Extraction, Ion Exchange, Electrodialysis, Reverse Osmosis, etc

Biological Process: A metabolic process in which microorganisms oxidize and decompose organic substances in sewage. Including Activated Sludge, Biological Filter, Biological Rotary Table, Oxidation Pond, Anaerobic Digestion, etc

Water Treatment Process Flow

Modern water treatment technology can be divided into Primary Treatment, Secondary Treatment and Tertiary Treatment according to the treatment degree.

Primary Treatment is mainly used to remove suspended solid pollutants in sewage. Most physical treatment methods can only meet the requirements of primary treatment. BOD can generally remove about 30% of the sewage after primary treatment, which cannot meet the discharge standard. The primary treatment belongs to the pretreatment of secondary treatment.

Secondary Treatment is mainly used to remove colloidal and dissolved organic pollutants (BOD, COD) in the sewage, with a removal rate of more than 90%, so that the organic pollutants can meet the discharge standard.

Tertiary Treatment is mainly used to further treatment of refractory organics, nitrogen, phosphorus and other soluble inorganic substances that can lead to eutrophication of the water body.

The whole water treatment process is that the raw sewage passing through the bar screen is lifted by the sewage lift pump, then passes through the grid or sieve, and then enters the grit chamber. The sewage passing through the sand-water separation enters the primary sedimentation tank, which is for primary treatment (i.e. physical treatment).

The effluent from the primary sedimentation tank enters the biological treatment equipment, including the activated sludge process and the biofilm process, (The reactor of the activated sludge process includes aeration tank, oxidation ditch, etc., and the biofilm process includes biological filter, biological rotary disc, biological contact oxidation and biological fluidized bed). The effluent from the biological treatment equipment enters the secondary sedimentation tank. The effluent from the secondary sedimentation tank is disinfected and discharged or enters the tertiary treatment. After the primary treatment, it is the secondary treatment.

The tertiary treatment includes biological nitrogen and phosphorus removal, coagulation sedimentation, and sand filtration, activated carbon adsorption method, ion exchange method and electrodialysis method.

Part of the sludge from the secondary sedimentation tank returns to the primary sedimentation tank or biological treatment equipment, part enters the sludge thickening tank, and then enters the sludge digestion tank. After dehydration and drying equipment, the sludge is finally used.

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