烟台辛安河污水处理厂工程的升级改造

Upgrade and Renovation of Yantai Xin'anhe WWTP

烟台辛安河污水处理厂工程设计总规模为12×10~4m^3/d,一期(4×10~4m^3/d)采用AO池型的百乐克工艺,二期(8×10~4m^3/d)采用改良A/A/O工艺,出水水质达到一级B标准。在出水水质升级为一级A的改造设计中,经过综合考虑,一期池体保持原状,仅对二期工程通过适当提高生物池的污泥浓度和增加曝气量、缺氧池补充碳源、提高内回流比、低温时将厌氧池改为缺氧池等措施,提高对氨氮、COD、BOD_5的处理效果。一期和二期出水汇入后续深度处理单元(高效沉淀池+转盘滤池+紫外消毒),出水水质可以达到预期的效果。

The final effluent of Yantai Xin＇ anhe WWTP with a design capacity of 120 000 m3/d, could only meet first level B standard of Discharge Standard of Pollutants for Municipal Waatewater Treat- ment Plant （GB 18918 -2002） previously. 40 000 m3/d of wastewatcr was treated by AO type B1OLAK process in the first stage, and 80 000 m3/d of wastewater was treated by modified A/A/O process in the second stage. During upgrade of the project to meet first level A standard for ammonia nitrogen, COD and BODs, the BIOLAK remains unchanged, while the process in the second stage was renovated through measures such as properly increasing sludge concentration, increasing aeration, adding carbon source, increasing internal reflux ratio, changing the anaerobic tank into anoxic tank function at low temperature. The effluents of two stages enter the advanced treatment unit including highly efficient sedimentation tank, rotary filter, and UV disinfection. Through the above measures, the effluent quality has been raised from first-level B to A standard.