水厂生物活性炭滤池去除多种有机污染物效果评估OA

Under the background of combined climate change and source-water pollution,multiple organic contaminants have been detected in water sources.The conventional"coagulation-sedimentation-sand filtration-disinfection"water purification treatment process still exhibits limitations in terms of health related risk control and the removal of emerging contaminants(ECs).The introduction of biological activated carbon(BAC)filter can enhance the level of risk control and the advanced removal capacity of pollutants.Accordingly,BAC filter has been widely incorporated into the upgrading and reconstruction of conventional treatment processes at water treatment plants(WTPs)in China.[Objective]This paper aims to evaluate the removal performance of various organic contaminants and the seasonal stability of treatment efficiency after the addition of a BAC filter,providing technical support for future process reconstruction in WTPs.[Methods]A one-year detection was conducted on finished water from two WTPs of a certain City in southern China,one using a conventional treatment process and the other equipped with an additional BAC filter following the conventional process.The performance of the two WTPs in removing permanganate index,dissolved organic matter(DOM),disinfection by-products(DBPs)formation potential(DBPs FP),and ECs was evaluated.[Results]The addition of the BAC filter did not significantly enhance the removal of the permanganate index or turbidity.However,it markedly improved the removal of fulvic acid-like and humic acid-like fractions in DOM,achieving removal efficiencies exceeding 50％.The removal of aromatic protein-like substances increased from below 20％to over 60％.The removal of the sample at 254 nm(UV254)followed a similar pattern,remaining stable above 60％across all seasons-approximately 20％higher than that of the conventional process.The removal of DBPs FP remained above 55％throughout all seasons,peaking in winter at over 80％.The toxicity of DBPs was dominated by haloacetaldehydes and halonitriles,accounting for more than 75％of total DBPs-associated toxicity.After adding the BAC filter,the removal efficiencies of these two DBP groups increased to over 50％in all seasons,resulting in more than a 50％reduction in DBPs toxicity of finished water-about 20％higher than the conventional treatment.Due to their high solubility,small molecular size,and strong chemical stability,certain ECs exhibited poor removal(＜40％)under the conventional process.In contrast,the addition of BAC filter substantially improved treatment performance,achieving over 90％removal for pesticide contaminants and up to 97％for antibiotics across all seasons.[Conclusion]The addition of BAC advanced treatment markedly enhances the removal of different DOM fractions in water in all seasons,reduces DBPs formation,and maintains ECs in finished water at low levels,demonstrating superior removal efficiency and process stability.