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Treatment of Industrial Wastewater and Civil Wastewater
We are always influenced by flood, draught or shortage of water resources for large areas for long time. Furthermore, we are also bothered by fate infectious diseases through water resources as spreading ways. In general, it still has some problems which risk and influence water conditions.
So, it needs to assure sustainable development for water quality and quantity.
Over-nourished pollution in the rivers, lakes, reservoir, seashore and seas coursed by agricultural discharging nitrate is constantly severe, and meanwhile the following danger is underestimated.
In past five years, as some measures had been taken in the fact of wastewater treatment in the field of industry and it has used non-phorus detergents on homes, so the discharge of phosphorus compound has been reduced 40 ～ 60%.
We shall gradually set up wastewater collection system and treatment system.
According to sensitive degree of contamination to water, the wastewater treatment is divided into first-class treatment, second-class treatment and third-class treatment.
Wastewater treatment processing could be composed with three serial treatment procession and primary treatment processing called preparative treatment.
Primary treatment refers to disposing stones, sands, fatness and grease from wastewater by mechanical treatment, grid, sedimentation and dissolved air ways.
First-class treatment refers to disposing suspended solids from wastewater by sedimentation and dissolved air tanks.
Second-class treatment refers to biological treatment, namely, contaminated materials in wastewater could be retrograded and conversed to sluge by the function of microorganisms.
Third-class treatment refers to deep treatment to wastewater, which includes disposing nutriment and sterilizing wastewater by adding chlorine, ultraviolet radiation or ozone technologies.
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