Determination And Treatment Technology Of Emerging Contaminants In Drinking Water In Pearl River Delta Area

The occurrence of 46 Emerging contaminants(ECs)in drinking-water systems,including water resource,water treatment processes,distribution system and bottled water,were investigated in Pearl river delta in China.Analysis methods were optimized with solid phase extraction(SPE)and ultra-performance liquid chromatography coupled with tandem mass spectrometry(UPLC-MS/MS).The potential risk to human health of the detected ECs was assessed preliminarily,priority parameters were identified.An integrated process of in-situ ozonation with ceramic UF membrane was explored for ECs removal from drinking water.ECs were ubiquity in drinking-water systems in Pearl river delta in China.Caffeine,2-QCA and BPA were found to be with the highest frequency and concentration in all samples,its maximum concentrations were 178.7 ng/L,37.9 ng/L and 131.,ng/L,respectively.Incomplete removal of ECs was found both in the conventional and advanced treatment plant,while the advanced treatment plant showed more efficient removal of ECs.It was the GAC filtration and chloramine disinfection process played substantial role in the removal of ECs during the advanced processes,the chlorination did so in the conventional processes.The chloramine would obviously result in the formation of NDMA in the distribution pipelines.ECs contaminants were detected in bottled water which were significantly connected with the source water.The human health risk assessment were conducted with Risk quotients(RQs)considering different life stages,and no detected ECs showed significant risk individually.The integration of in-situ ozonation with ceramic UF membrane showed higher removal efficiency of PPCPs than ozonation alone.The integrated processes of in-situ ozonation with ceramic UF membrane are effective in NDMA removal.About 85%of NDMA can be removed when the dissolved ozone concentration was 4.8 mg/L during the continuous experiments.The oxidative reaction in ceramic membrane pores contributed significant degradation of NDMA.More ozone dosage,more reactive degradation takes place inside membrane pores.However,detailed reaction mechanisms need to explore in the future.This thesis is of significant role in understanding the occurrence,risk and treatment technologies of newly emerging contaminants in the Pearl river delta area in China.