Design elements of emergency sewage treatment station in a town of Beijing

Abstract

A modified 5 000 m3/d sewage treatment station would be built in a town of Beijing, the main source of sewage contained domestic sewage and industrial wastewater. The designed influent water quality took measured water quality and designed water quality of the present sewage treatment station as the reference, while the effluent water quality was required to meet Level B of the Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (DB 11/890-2012). Considering factors such as land occupation, operation management, treatment effect, construction cycle and project investment, etc., the progress of anaerobic-anoxic-oxic+moving bed biofilm reactor (AAO+MBBR)+high density sedimentation tank+cloth media filter was selected, with comparing different secondary treatment processes and advanced treatment processes. Most of the process structures employed integrated devices. The investment of the station, water treatment cost per ton, and the influent/effluent water quality indices in real operation were introduced in detail. After the completion of the project, an 8-month actual operation showed that the effluent qualities met the level B of the Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (DB 11/890-2012) completely, providing experience for the construction of similar sewage treatment stations.

Keywords

• sewage treatment plant
• emergency project
• integrated device
• aao-mbbr