College of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Zhengzhou 450001, China.
College of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Zhengzhou 450001, China.
Sci Total Environ. 2019 Aug 20;679:288-297. doi: 10.1016/j.scitotenv.2019.04.441. Epub 2019 Apr 30.
A novel Moving-Bed Biofilm Reactor (MBBR), based on proton-exchange membrane electrolysis, was developed and tested for perchlorate transformation. The bacteria growing on the carrier in the cathode chamber could use in situ-generated hydrogen to reduce perchlorate to chloride via electrolysis; the resulting chloride ions and chloride ions in raw water were then oxidized into chlorine by anode reaction to disinfect the final effluent and improve water quality. For a ClO concentration of 10.00 ± 0.08 mg/L in the influent, at hydraulic retention times (HRTs) of 4.0, 2.0, and 1.5 h, the optimal applied currents (OACs) were 130, 240, and 270 mA, with a corresponding removal efficiencies of 99.90 ± 0.21, 96.70 ± 0.36, and 78.50 ± 0.24%, respectively. Active chlorine concentration was in the range of 0.063-0.096 mg/L, contributing to simultaneous electro-disinfection. Along the water flow direction, OH generated by the cathode could be neutralized in the anode chamber; thus, the final effluent pH was kept a balance with the influent pH. Proteobacteria, Bacteroidetes, and Firmicutes were the dominant bacteria in the MBBR. The maximum value of current efficiency (13.32 ± 0.69%) was obtained at 100 mA and an HRT of 4.0 h, which was in accordance with the abundance of Thauera.
一种基于质子交换膜电解的新型移动床生物膜反应器（MBBR）被开发并用于测试高氯酸盐的转化。阴极室内载体上生长的细菌可以利用原位生成的氢气通过电解将高氯酸盐还原为氯离子；生成的氯离子和原水中的氯离子随后通过阳极反应被氧化成氯气，以消毒最终出水并改善水质。在进水 ClO 浓度为 10.00 ± 0.08 mg/L 的情况下，水力停留时间（HRT）分别为 4.0、2.0 和 1.5 h 时，最优应用电流（OAC）分别为 130、240 和 270 mA，相应的去除效率分别为 99.90 ± 0.21%、96.70 ± 0.36%和 78.50 ± 0.24%。活性氯浓度在 0.063-0.096 mg/L 范围内，有助于同时进行电消毒。随着水流方向，阴极产生的 OH 在阳极室中被中和；因此，最终出水的 pH 值与进水的 pH 值保持平衡。变形菌门、拟杆菌门和厚壁菌门是 MBBR 中的优势细菌。在 100 mA 和 4.0 h 的 HRT 下，电流效率达到最大值（13.32 ± 0.69%），这与 Thauera 的丰度相对应。
