摘要
Abstract
[Objective]The construction scale of a wastewater treatment plant(WWTP)in a certain town in Shandong Province is 30 000 m3/d.The actual processing capacity is 21 000 m3/d.The original process used a wastewater treatment process of"coarse grid and lifting pump station+fine grid and aeration sedimentation tank+modified pre-anoxic anaerobic/anoxic/oxic(AAO)biochemical treatment+secondary sedimentation tank+high-efficiency sedimentation tank+chlorination disinfection",and the effluent quality complied with the first level A standard in the Discharge Standard of Pollutants for Municopal Wastewater Treatment Plant(GB 18918-2002).Due to the inability of the project to meet higher water quality requirements and limited land on site,it was necessary to carry out in-situ upgrading and reconstruction of the current process.[Methods]By adjusting the partition tank capacity and hydraulic flow direction of the biochemical treatment unit,and adding new influent points,adding biological fillers,and resetting the aeration system,the improved AAO process was transformed into the improved improved AAO-moving bed biofilm reactor(MBBR)process,[Results]achieving good pollutant removal effects.The biochemical treatment system was more stable,reliable,and could be flexibly regulated.After the renovation was completed,ammonia nitrogen,total phosphorus(TP),chemical oxygen demand(CODCr),and BOD5 of effluent of the WWTP met the Class Ⅳ standards in the Environmental Quality Standards for Surface Water(GB 3838-2002),with mass concentration of total nitrogen(TN)no more than 12 mg/L.[Conclusion]This project has the characteristics of land saving,investment saving,efficient and stable operation,and good treatment effect.After the implementation of the renovation,the total amount of pollutant discharge is reduced,and the water environment quality of the receiving water body is effectively improved.It provides reference and guidance for similar sewage treatment plant upgrading and renovation projects.关键词
提标改造/节约占地/改良AAO-MBBR/污水处理厂/脱氮Key words
upgrading and reconstruction/save land occupation/modified AAO-MBBR/wastewater treatment plant(WWTP)/denitification分类
建筑与水利
