过硫酸盐高级氧化/陶瓷膜超滤原位耦合同步强化微量有机物去除与NOM膜污染控制机理研究

超滤技术可有效保障饮用水的生物安全性，但存在微量有机物去除效率低和天然有机物（NOM）膜污染的问题。本项目提出了过硫酸盐高级氧化/陶瓷膜超滤原位耦合技术设想：首先基于支撑层掺杂与分离层涂覆相结合的CuO双层负载理念，制备具有“双区”过硫酸盐活化功能的催化陶瓷膜，并构建浸没式接触催化反应器，将陶瓷膜外部壁面区域和内部孔道区域的催化作用有机结合；解析微量有机物在催化陶瓷膜“壁面区域-孔道区域”的耦合降解特性与机理，阐明过硫酸盐原位活化过程对NOM膜污染的控制机理，明确过硫酸盐高级氧化/陶瓷膜超滤原位耦合体系优化调控的关键要素与调控原理。本项目以“CuO双层负载-过硫酸盐双区活化-氧化与膜滤耦合”为技术主线，重点突破催化陶瓷膜超滤过程中氧化剂与污染物的传质规律以及活化氧化机理等关键科学问题，实现微量有机物去除和NOM膜污染控制的同步强化，为饮用水的高效净化提供理论依据和技术支持。

Ultrafiltration (UF) has been recognized as one of the most advanced technologies in drinking water treatment. The microbiological safety of drinking water can be effectively guaranteed by UF membrane. However, the UF process is subjected to two key problems, i.e. the low removal efficiency for trace organic compounds, and the severe membrane fouling by natural organic matter (NOM) during the treatment of surface water. To address these issues, the in-situ coupling process of “persulfate advanced oxidation/ceramic membrane ultrafiltration” is proposed in this project. Firstly, according to the double-layer CuO loading concept which comprises both support layer doping and active layer coating, a novel catalytic ceramic membrane with “double zone” persulfate activation function will be prepared. And then, a submerged contact catalytic reactor by employing the catalytic ceramic membrane will be constructed, in which the catalytic effect of the CuO coated on the active layer and that doped in the support layer will be well combined. By doing so, it is highly expected that the activation of persulfate will be substantially enhanced during the UF process by the catalytic ceramic membrane. After that, the catalytic degradation effect and mechanism of trace organic compounds in the two reaction zones of the ceramic membrane, i.e. the outside surface of active layer and the inside pore-wall of support layer, will be systematically discussed. The oxidative degradation behavior of NOM by in-situ persulfate activation during the UF process will be analyzed, and the corresponding mechanism for membrane fouling control will be illustrated. The key factors and principles for regulating the in-situ coupling process of “persulfate advanced oxidation/ceramic membrane ultrafiltration” will be also explored. This project takes the “CuO double-layer loading—persulfate double-zone activation—oxidation/ultrafiltration coupling” as the main technological outline; special efforts will be made to break through the scientific issues of mass transfer of oxidants and pollutants as well as the mechanism of persulfate activation and oxidation in the UF process of the catalytic ceramic membrane. The purpose is to realize the simultaneous enhancement in the removal of trace organic compounds and control of NOM membrane fouling. The research results can provide theoretical basis and technical support for the efficient and advanced drinking water treatment.