Water treatment is of great work to developing industrial production, improving products quality, protecting human beings and maintaining ecological balance.

Sewage water treatment has mechanical treatment, such as grid, sedimentation or air flotation, to remove stones, sand and fat, iron ions, manganese ions, grease and the like contained in the sewage.

Then biological treatment, the pollutants in the sewage are degraded and converted into sludge under the action of microorganisms.