Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, Guangdong 518055, China; School of Environment, Tsinghua University, Beijing 100084, China.
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, Guangdong 518055, China; School of Environment, Tsinghua University, Beijing 100084, China.
Water Res. 2022 Aug 15;222:118881. doi: 10.1016/j.watres.2022.118881. Epub 2022 Jul 19.
The performance of an integrated process comprising coagulation, ozonation, and catalytic ceramic membrane filtration (CMF) followed by treatment with biological active carbon (BAC) was evaluated in a pilot-scale (96 m/d) experiment to understand the biostability and quality of the finished water. The fate of dissolved organic matter (DOM) at the molecular level was explored using Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Biostable finished water with an assimilable organic carbon (AOC) concentration of 30.2-45.4 µg/L was obtained by the integrated process, and the high hydraulic retention time (HRT) (≥ 45 min) of the BAC filter was necessary to provide biostable finished water. The coagulation/O/CMF unit efficiently transformed nitrogen-containing polyaromatic hydrocarbons (PAH) with aromaticity and large molecular weight (Mw) (500-1000 Da) into CHO-type highly unsaturated phenolic compounds (HuPh) with less aromaticity and medium Mw (300-500 Da), which were effectively removed by subsequent BAC filtering. The main reaction was oxygen addition, followed by deamination and dealkylation of the coagulation/O/CMF unit and decarboxylation of the BAC filter. Principal component analysis revealed that N-containing and large-Mw PAH are potential AOC precursors, and the chemical characteristics of CHO-type and medium-Mw HuPh make them AOC candidates (correlation coefficients > 0.96). This study provides insights into the management of drinking water biostability and its suitability for the practical application of the integrated coagulation/O/CMF-BAC process in drinking water treatment plants.
采用混凝-臭氧-催化陶瓷膜过滤（CMF）集成工艺，并结合生物活性炭（BAC）后处理，在中试规模（96m³/d）实验中评价了该工艺处理饮用水的生物稳定性和出水水质。采用傅里叶变换离子回旋共振质谱（FT-ICR MS）探索了溶解有机物（DOM）在分子水平上的命运。通过集成工艺获得了生物稳定性好的出水，其可同化有机碳（AOC）浓度为 30.2-45.4μg/L，BAC 滤池的高水力停留时间（HRT）（≥45min）是提供生物稳定性好的出水的必要条件。混凝/O/CMF 单元有效地将含氮多环芳烃（PAH）转化为芳香度和分子量（Mw）较大（500-1000Da）的 CHO 型高度不饱和酚类化合物（HuPh），这些化合物的芳香度和 Mw（300-500Da）较低，随后通过 BAC 过滤可以有效去除。主要反应是氧的加成，随后是混凝/O/CMF 单元的脱氨和脱烷基化以及 BAC 滤池的脱羧。主成分分析表明，含氮和大分子量的 PAH 是潜在的 AOC 前体，CHO 型和中等分子量的 HuPh 的化学特性使其成为 AOC 的候选物（相关系数>0.96）。本研究为饮用水生物稳定性的管理以及混凝-O/CMF-BAC 集成工艺在饮用水处理厂的实际应用提供了参考。
