Design of Quasi-Ⅳ standard upgrading and expansion for a sewage treatment plant
To support the implementation of regional ecological protection and restoration projects,the treatment capacity of a sewage treatment plant in Shandong is set to be expanded from the 60 000 m3/d to 120 000 m3/d.The project maximizes the use of existing treatment facilities within the plant and adopts an upgraded treatment process comprising"pre-treatment+AAO(Anaerobic-Anoxic-Oxic)biological reaction tank+high-efficiency sedimentation tank+deep-bed denitrification filter+ultraviolet disinfection".The effluent quality meets the required ClassⅣstandard specified in the"Environmental quality standards for surface water"(GB 3838-2002),with the exception of total nitrogen,which is controlled to≤10 mg/L.Results indicate that the combined process is highly effective in the advanced removal of nitrogen,phosphorus,and suspended solids.Additionally,the precise addition of carbon sources,controlled through an automatic control system,ensures that the deep-bed denitrification filter can serve as a reliable measure for achieving total nitrogen standards.Post-implementation,the water quality of the downstream section of the receiving water body shows significant improvement.This study provides a valuable reference for upgrading sewage treatment plants in Shandong Province and contributes to advancing ecological protection efforts in the Yellow River Basin.The project demonstrates both environmental and economic benefits.
sewage treatment plantupgrading and expansionQuasi-Ⅳ standarddeep-bed denitrification filter
万方数据
维普
