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Screen filtration | After the sewage enters the treatment equipment, it is first filtered through the screen to remove the large particles of suspended solids and solid wastes |
Sand sedimentation tank | after filtering through the ornamental net sewage into the sand sedimentation tank, the use of gravity, so that the heavier suspended solids settled to the bottom, the formation of sediment, purification of sewage |
Sedimentation tank | After the treatment of sand sedimentation tank sewage into the sedimentation tank, the use of sedimentation tank with a longer residence time, so that the smaller suspended solids and plankton settle to the bottom, the formation of sludge |
Adjustment of pH value | By adding chemicals, the pH value of the sewage is adjusted to make it suitable for the subsequent treatment process. For example, acidic sewage can be added to alkaline chemicals to neutralize the treatment |
Coagulant addition | by adding coagulant, so that the suspended particles in the sewage coagulation into larger clusters, to facilitate the subsequent settlement or filtration. Commonly used coagulants are polymerized aluminum chloride, polymerized iron sulfate and so on |
purifying agent casting | according to the type and concentration of pollutants in the sewage, select the appropriate purifying agent casting, in order to remove organic matter, heavy metal ions and other harmful substances. Commonly used purification agents are activated carbon, chlorine, ozone and so on |
Aerobic biological treatment | after physical and chemical treatment of sewage into the aerobic biological treatment unit, through the passage of oxygen and suitable temperature, pH and other conditions, the use of aerobic microorganisms on the degradation of organic matter, organic matter into carbon dioxide and water |
Anaerobic biological treatment | part of the difficult to degrade organic matter and sludge into the anaerobic biological treatment unit, the use of anaerobic microorganisms on the degradation of organic matter, producing methane and other reusable gases |