College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
Bioresour Technol. 2024 Sep;407:131115. doi: 10.1016/j.biortech.2024.131115. Epub 2024 Jul 14.
This study developed a microelectrolysis-integrated constructed wetland with pyrite filler around the cathode (e-PCW) to treat eutrophic water. Results indicated that e-PCW effectively enhanced pyrite dissolution, converting solid-phase electron donors into bioavailable forms, thereby facilitating the enrichment of various denitrifying bacteria on pyrite surfaces. Importantly, iron-reducing and sulfur-reducing bacteria attached to the pyrite surfaces enhanced the conversion of ferric iron and sulfate, thereby driving iron and sulfur cycles and promoting electron transfer. Therefore, synergistic effects of pyrite and microelectrolysis made e-PCW achieve higher total nitrogen (TN) and total phosphorus (TP) removal efficiencies. With a hydraulic retention time of 24 h, the highest removal efficiencies of TN and TP achieved 78% and 75%, respectively. Furthermore, when eutrophic water containing high concentration of algae was fed into e-PCW, it consistently demonstrated superior TN and TP removal capabilities. This work provides a valuable approach to optimizing constructed wetland technology for treating eutrophic water.
本研究开发了一种在阴极周围填充黄铁矿的微电解集成人工湿地（e-PCW）来处理富营养化水。结果表明，e-PCW 有效地促进了黄铁矿的溶解，将固相电子供体转化为生物可利用的形式，从而有利于各种反硝化细菌在黄铁矿表面的富集。重要的是，附着在黄铁矿表面的铁还原菌和硫还原菌增强了三价铁和硫酸盐的转化，从而驱动铁和硫循环，促进电子传递。因此，黄铁矿和微电解的协同作用使 e-PCW 实现了更高的总氮（TN）和总磷（TP）去除效率。水力停留时间为 24 h 时，TN 和 TP 的最高去除效率分别达到 78%和 75%。此外，当含有高浓度藻类的富营养化水被输入 e-PCW 时，它始终表现出优异的 TN 和 TP 去除能力。这项工作为优化人工湿地技术处理富营养化水提供了一种有价值的方法。
