Abstract:The current scale of a wastewater treatment plant (WWTP) in Wuhu City is 10×104 m3/d. Its effluent is in compliance with the first level A discharge standard of China. WWTP is upgraded and reconstructed. Its effluent quality meets the surface quasi-class IV water standard. By comparing and studying the schemes, the aerobic zone of the biological reaction tank is re-divided. The part of the tank is divided into the adjustable area of anaerobic / aerobic zone, and the part of the tank is used for adding the aerobic suspended filler in order to enhance the nitrification and denitrification process, which ensures the effluent quality up to standard stably, and can provide a reference for the upgrading and reconstruction of WWTP surface quasi-class IV water.
