State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, 2052, Australia.
Environ Res. 2020 Jan;180:108861. doi: 10.1016/j.envres.2019.108861. Epub 2019 Oct 30.
An electrochemical dynamic membrane filtration (EDMF) system for simultaneous solid-liquid separation (also protecting electrodes against fouling) and sewage disinfection was developed. At a low voltage of 2.5 V, efficient disinfection performance was achieved in the EDMF, with 100% log removal efficiency (no detectable bacteria in the effluent). Results also demonstrated that the EDMF system, operated at membrane flux of 100 L/(m h), could maintain long-lasting bacterial disinfection efficiency of real wastewater (100% log removal) in continuous flow tests. Transmembrane pressure (TMP) increased from 0.8 kPa to 22 kPa within 80 d (one operation cycle), and cleaning of EDMF could effectively restore TMP and biocidal behaviors for subsequent filtration cycles. In contrast, without dynamic membrane, the disinfection efficiency was decreased from initial ~100% log removal (with no detectable live bacteria) to ~44.4% log removal within 7 d. Reactive oxygen species (ROS)-mediated oxidation was responsible for bacteria disinfection in the EDMF, and HO• and HO generated in this system played a dominant role, causing damage to cell membranes and K leakage from cytosol. Moreover, catalase and superoxide dismutase for intracellular ROS attenuation were inhibited, resulting in the increase of intracellular oxidative stress and thus high-efficient disinfection. These results highlight the potential of EDMF system to be used for wastewater treatment and disinfection.
电化学动态膜过滤（EDMF）系统用于同时进行固液分离（同时保护电极免受污染）和污水消毒。在 2.5 V 的低电压下，EDMF 实现了高效的消毒性能，对数去除效率达到约 100%（出水中检测不到细菌）。结果还表明，在膜通量为 100 L/（m h）的条件下，EDMF 系统可以在连续流测试中保持对实际污水的持久细菌消毒效率（约 100%对数去除）。跨膜压力（TMP）在 80 天内从 0.8 kPa 增加到 22 kPa（一个操作周期），EDMF 的清洗可以有效地恢复 TMP 和后续过滤循环的杀菌性能。相比之下，如果没有动态膜，消毒效率会从初始的约 100%对数去除（无活细菌检出）下降到 7 天内的约 44.4%对数去除。活性氧物质（ROS）介导的氧化是 EDMF 中细菌消毒的原因，HO•和 HO 在该系统中生成，导致细胞膜损伤和细胞质中 K 渗漏。此外，细胞内 ROS 衰减的过氧化氢酶和超氧化物歧化酶被抑制，导致细胞内氧化应激增加，从而实现高效消毒。这些结果突出了 EDMF 系统在废水处理和消毒方面的潜力。
