高效沉淀池及生物滤池工艺在城市污水处理厂的应用及运行效果

重庆市某污水厂一期工程处理能力及出水水质均不能满足需求,且该厂位于人口密集区,用地面积紧张.改扩建工程采用地下式建设型,避免对周边居民产生不利影响.根据对实际进水水质分析,通过对两级生物滤池工艺和MBR工艺进行技术经济综合比较,确定采用两级生物滤池工艺.为减少厌氧除磷对生物脱氮的影响,并减少滤池的堵塞风险,在生化池前采...

Application and Operation Effect of High-Efficiency Sedimentation Tank and Biofilter Process in Urban WWTP

Treatment capacity and effluent quality of a sewage treatment plant in Chongqing can not meet demand,and plant is located in densely populated areas with a tight land area.Underground construction type is used in this renovation and expansion project to avoid adverse effects on surrounding residents.According to actual water quality analysis,two-stage biofilter process and MBR process are adopted for comprehensive technical and economic comparison,and two-stage biofilter process is determined.In order to reduce the influence of anaerobic phosphorus removal on biological nitrogen removal and reduce risk of filter clogging,chemical phosphorus removal in high-efficiency sedimentation tank is used before biochemical tank.Wastewater treatment plant adopts the process of"high-efficiency sedimentation tank+denitrification biological filter+aerated biological filter",with land index of 0.3 m^2/(m^3·d).Effluent water quality includes CODCr of 13~38 mg/L,BOD5 of 1.6~5.4 mg/L,SS of 3~4 mg/L,ammonia nitrogen of 0.1~0.22 mg/L,total nitrogen of 7.2~12 mg/L,total phosphorus of 0.04~0.11 mg/L,and operation cost of 0.45 yuan/ton.Process covers a small area,effluent quality can reach the discharge standard of Class A steadily,and operation cost is moderate,so it is suitable for underground sewage treatment plant.