人工湿地与臭氧联合处理技术用于以再生水为补水水源的景观湖净化

采用人工湿地与臭氧联合处理技术,深度净化以污水厂尾水为再生水的补水水源,及对景观湖水进行循环净化,保证景观湖水质和水量。介绍了系统的工艺设计,并对运行后的水质进行检测分析。人工湿地系统以净化后污水厂尾水作为景观湖补水,水力负荷为0.268 m~3/(m~2·d)时,COD和BOD_5去除率可达60%以上,氨氮和TN去除率达80%以上,TP去除率达70%。人工湿地用于湖水循环净化,水力负荷为1.07 m~3/(m~2·d)时,人工湿地对污染物的总去除率为40%~50%。为防止湖水富营养化,阶段性启动臭氧系统进行湖水脱色、除臭处理,当臭氧投加量为3 mg/L时,对色度去除率可达80%,对氨氮去除率可达40%以上。

COMBINED TREATMENT OF CONSTRUCTED WETLAND AND OZONE SYSTEM FOR PURIFYING LANDSCAPE LAKE WATER WITH RECLAIMED WATER AS WATER SOURCE

Combined treatment of constructed wetland and ozone system are used to deeply purify tail water in sewage treatment plant used for lake water source and to circularly purify the landscape lake water,for ensuring its water quantity and quality.In this paper,the technical flow and design parameters are introduced and the water quality is analyzed in the stable operation.When constructed wetland system is used for treating s tail water from sewage treatment plant as lake water source,the hydraulic load is at 0.268 m3/(m2· d),the average removal rates of COD and BOD5 reach more than 60％,NH3-N and TN are over 80％,TP is above 70％.When constructed wetland system is used for circularly purifying landscape lake water,the hydraulic loading rate is at 1.07 m3/(m2· d),the overall removal rates of pollutants are about 40％ ～ 50％.In order to restrain the eutrophication of the landscape lake,ozone system is periodically started for decoloration and deodorization of the lake water.When the ozone dosage is 3 mg/L,chroma removal rate reaches to 80％,NH3-N removal rate is over 40％.