臭氧生物活性炭与膜组合工艺在某水厂深度处理工艺中的应用

摘要

盐城市某水厂采用O3-BAC与膜组合工艺用于饮用水深度处理.通过对各工艺出水常规指标及阴离子指标的监测表明:经O3-BAC+超滤+纳滤膜处理工艺后,出水常规指标(浊度、氨氮、CODMn)分别降至0.05 NTU、0.03 mg/L、0.65 mg/L,相比于常规处理,去除率高达99.7％、94.8％、88.3％;阴离子指标中F-、Br-、SO42-未检出,Cl-降至12.6 mg/L,NO3降至1.5 mg/L,单纯常规+O3-BAC+超滤都不能很好地去除水中阴离子.对各工艺出水(常规、O3-BAC、超滤及纳滤)进行小试消肖毒,结果发现:各工艺消毒出水中DBPs依次呈降低趋势,经纳滤膜处理后,THMs及HAAs仅为2.0 μg/L、50.8 μg/L,表明组合工艺可以有效降低消毒出水DBPs含量,保障饮用水水质安全性.最后结合运行及建设成本,对各工艺的特点进行了对比分析,为其他水厂的升级改造提供参考.%A drinking water advanced treatment system utilizing combined processes of ozone-BAC and membrane is used in a water treatment plant of Yancheng City.The results indicate that the conventional index (turbidity,ammonia nitrogen,CODMn) of effluent are reduced to 0.05 NTU,0.03 mg/L and 0.65 mg/L respectively after ozone-BAC + ultrafiltration + nanofiltration membrane treatment process.And the removal rates are up to 99.7％,94.8％ and 88.3％ compared to conventional treatment.Anionic F-,Br-and SO42-are not detected,Cl-and NO3-fall to 12.6 mg/L and 1.5 mg/L,respectively.However,conventional + ozone-BAC + ultrafiltration may not remove anions in water effectively.The disinfection shows that disinfection byproducts (DBPs) in the effluent of each process (conventional process,ozone-BAC,ultrafiltration and nanofiltration) decrease,and after nanofiltration membrane treatment,THMs and HAAs are only 2.0 μg/L and 50.8 μg/L,respectively.It indicates that combined process can effectively reduce the DBPs content of disinfection effluent to ensure the safety of drinking water quality.Finally,this paper compares the characteristics of each process with the operation and construction cost,and provides references for the upgrading of other water treatment plants.