After upgrading waste water one times by the pump, the design finished the sewage whole treatment process by gravity flow to avoid repeating sewage upgrade in order to reduce losing power, decrease the cost of wastewater treatment and manage the operation easily.
The design is technically feasible and economically reasonable results. The whole process designed can effectively save the project investments, reduce processing costs, reduce the space with a total investment of less stable, to ensure that emissions from waste-water reach the standard and it is a simple process.
The treated wastewater is expected to achieve the B level of " pollutant discharge standards of urban sewage treatment plant " (GB18918-2002), that is: CODcr ≤ 60 mg / L; BOD5 ≤ 20mg / L; SS ≤ 20mg / L ; NH3-N ≤ 8mg / L; TN ≤20mg/L. So the contaminated water can be greatly improved, to achieve the aim of elimination of pollution, protection of the environment and the purpose of the benefit of human being.