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Treatment generally consists of the following three levels: primary treatment is by mechanical processes, such as grilles, settling or flotation, removal contained in the rocks, sand and gravel, and fats, oils, etc. Secondary treatment is a biological process in wastewater contaminants to microbial degradation and transformation under the effect of sludge recycling. Advanced tertiary treatment, sewage treatment, which includes nutrient removal by chlorination, UV radiation or ozone disinfection of wastewater. May according to the different treatment targets and water quality, wastewater treatment processes are not included all of the above processes.