水体中赋存的痕量新污染物与生物可同化有机碳（AOC）导致的微生物再生是影响饮用水水质安全的重要因素。本文将重点关注上述风险，针对饮用水处理系统进行水质调研，探究AOC与多种ECs带来的水质安全风险及成因。开发新型锰基催化剂耦合臭氧深度处理饮用水，实现AOC前体物与痕量ECs的高效去除，结合多种表征与计算手段解析催化效率提升机理。研究表明水厂现行臭氧-生物活性炭（O3-BAC）深度处理工艺对AOC与ECs的去除效果有限。氯消毒氧化作用导致的AOC浓度升高是出厂水水质生物不稳定的重要因素，同时基于冗余分析（RDA）发现AOC对饮用水处理系统中病原菌的群落组成产生重要影响（Ex = 43.9%，p ≤ 0.01）。因此应重点关注氯消毒导致的水质生物不稳定风险并强化AOC前体物的去除。BAC单元的吸附作用使其成为新污染物重要的富集场所，10种被检出的抗生素总含量超过了400 ng/g，并于冬季时监测到新污染物存在泄露风险。基于RDA的方差分解（VPA）分析表明，富集于生物膜上的新污染物对微生物种群群落（Ex = 59%）和抗性基因丰度（Ex = 33%）产生了重要的影响，需对其重点关注。采用锰氧化物（Mn@CMs）耦合臭氧深度处理沉后水。结果表明，O3/Mn@CMs工艺能够有效的去除AOC前体物（> 80%）与荧光类组分（> 45%）。并有效提升DOM的饱和性，但是反应前体物数量较少，活性氧物种（ROS）与污染物分子间的相互作用机会有限，因此部分痕量新污染物难以被去除。针对一元锰氧化物催化及传质效率低的问题，采用共沉积法制备了富含氧空位（OVs）的ZnMnO3催化臭氧降解污染物。丰富的OVs促进了锌位点处水合羟基的暴露与锰位点处臭氧分子的吸附，同时其自身可以作为电子供体活化O2生成H2O2强化ROS的传质，使ZnMnO3展现出优异的污染物降解能力。采用浸渍-共沉积-煅烧法将ZnMnO3原位负载于陶瓷颗粒（MnZn@CMs）催化臭氧深度处理饮用水。在低臭氧投加量下（2 mg/L），O3/MnZn@CMs工艺对AOC前体物（> 90%）与荧光类组分（> 70%）去除效率突出。催化过程产生的1O2和O2?-与原位产生的H2O2一同促进了ROS的传质，使O3/MnZn@CMs工艺实现了痕量新污染物的高效去除，且具有长效稳定运行性能。
Trace emerging contaminants (ECs) and assimilable organic carbon (AOC) induced microbial regrowth are significant factors affecting the safety of drinking water quality. This work will focus on these risks, conducting a water quality investigation in drinking water treatment systems to quantitatively explore the safety risks associated with AOC and various ECs. A novel manganese-based catalyst coupled with ozone was developed for advanced drinking water treatment, and the mechanism of enhanced catalytic efficiency was elucidated through various characterization and computational methods.The removal effectiveness of AOC and ECs was limited in the investigated advanced drinking water treatment plants. The chlorination effect on the increasing AOC concentrations was the main factor contributing to the biological instability of finished water. According to the redundancy analysis (RDA), the composition of pathogenic bacteria was significantly affected by the variation of AOC concentrations (Er = 43.9%, p ≤ 0.01). Therefore, the biological instability risk induced by chlorination should be paid more attention and enhancing the removal of AOC precursors.As a conventional adsorption unit, biological activated carbon (BAC) filtration may possess the enrichment risk of ECs. The total content of ten detected ECs reached over 400 ng/g and a serious ECs leakage of BAC filters was found during the winter. According to the RDA and variation partitioning analysis (VPA) results, the enriched ECs significantly affected the bacterial community (Er = 59%) and the abundance of antibiotic resistance genes (Er = 33%) in BAC, necessitating focused attention.Manganese oxides coated ceramsites (Mn@CMs) coupled with ozone was employed for advanced treatment of drinking water. O3/Mn@CMs process exhibited certain elimination performance for AOC precursors (> 80%) and fluorescence components (> 50%). The saturability of DOM could be effectively improved during O3/Mn@CMs process, but less precursors reduced the interaction opportunities between reactive oxygen species (ROS) and pollutant molecules. Therefore, the elimination performance of trace ECs was limited, wherein ciprofloxacin still maintained high ecological risk which need further treatment.To overcome the drawback of low catalytic and mass transfer efficiency, manganese-zinc bimetallic oxide (ZnMnO3) rich in oxygen vacancies (OVs) had been prepared for catalytic ozonation via co-deposition method. The abundant OVs could promote the exposure of hydrated hydroxyl groups at Zn sites and the adsorption of ozone molecules at Mn sites. Meanwhile, OVs could also be served as electron donors to activate O2 for H2O2 generation, enhancing ROS transformation. Therefore, ZnMnO3 exhibited excellent contaminant degradation capability (k = 0.117).ZnMnO3 loaded ceramic catalyst (MnZn@CMs) was successfully prepared using impregnation-co-deposition method for catalytic ozonation of drinking water. O3/Mn@CMs process showed outstanding removal efficiency for AOC precursors (> 90%) and fluorescent components (> 70%). ROS transfer had been enhanced by generated 1O2 and O2?-, along with in-situ produced H2O2., and thus O3/Mn@CMs process achieved efficient removal of trace ECs and commendable long-term stability.
