This design is the preliminary design of a city sewage treatment plant. The design of city sewage treatment sewage for industrial wastewater and domestic water, deal with the scale of 171600m3/d. The main task is to design and calculate the selection and construction process.
This design uses the A2O process. This is the process of simultaneous nitrogen and phosphorus removal process is the most simple, short hydraulic retention time. In the anaerobic aerobic conditions, filamentous bacteria could not proliferate, less sludge bulking. Sludge high phosphorus content, high efficiency, easy to solve the problem of sludge treatment. In addition, the process has the advantages of low operating costs.
The effluent from a sewage treatment plant after treatment up to the national "urban sewage treatment plant pollutant discharge standard" (GB18918-2002) is a B standard.