Yang Kui, Feng Xingwei, Lin Hui, Xu Jiale, Yang Cao, Du Juan, Cheng Dengmiao, Lv Sihao, Yang Zhifeng
Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, PR China; Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, PR China.
Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
J Hazard Mater. 2022 Feb 5;423(Pt B):127239. doi: 10.1016/j.jhazmat.2021.127239. Epub 2021 Sep 17.
Herein, we reported a tandem multilevel reactive electrochemical membrane (REM) system was promising for the rapid and complete removal of trace antibiotics from natural waters. Results indicate that a four-stage REM module-in-series system achieved steady over 98% removal of model antibiotic norfloxacin (NOR, 100 μg·L) from wastewater treatment plant final effluent and surface water with a residence time of 5.4 s, and the electric energy consumption was only around 0.007-0.011 kWh·m. As for the oxidation mechanism, direct electron transfer (DET) oxidation process played an important role in NOR rapid oxidation, enabling the REM system to tolerate various OH scavenges in natural waters, including natural organic matters, Cl and HCO, even at very high concentration levels. Meanwhile, OH-mediated indirect oxidation process promotes the oxidation and mineralization of NOR. Although the DET-dominated oxidation mechanism makes the REM system cannot achieve the complete mineralization of NOR with residence times of few seconds, the antibacterial activity from NOR was completely eliminated. This REM system featured effective removal performance of trace contaminants with low energy cost and was tolerant to complex waster matrix, suggesting that it could be a powerful supplementary step for wastewater/water treatment.
在此，我们报道了一种串联多级反应电化学膜（REM）系统有望从天然水体中快速、完全去除痕量抗生素。结果表明，一个四级串联的REM模块系统能够在5.4秒的停留时间内，使来自污水处理厂最终出水和地表水的模型抗生素诺氟沙星（NOR，100μg·L）的去除率稳定超过98%，且电能消耗仅约为0.007 - 0.011kWh·m。至于氧化机制，直接电子转移（DET）氧化过程在NOR的快速氧化中起重要作用，使REM系统能够耐受天然水体中的各种羟基清除剂，包括天然有机物、Cl和HCO，即使在非常高的浓度水平下也是如此。同时，羟基介导的间接氧化过程促进了NOR的氧化和矿化。尽管以DET为主导的氧化机制使得REM系统在几秒的停留时间内无法实现NOR的完全矿化，但NOR的抗菌活性被完全消除。该REM系统具有以低能量成本有效去除痕量污染物且耐受复杂废水基质的特点，表明它可能是废水/水处理的有力补充步骤。
