School of Environment, Tsinghua University, Beijing 100084, China.
School of Environment, Tsinghua University, Beijing 100084, China; Zhejiang Provincial Key Laboratory of Water Science and Technology, Zhejiang 314006, China.
Bioresour Technol. 2018 Oct;265:437-442. doi: 10.1016/j.biortech.2018.06.034. Epub 2018 Jun 14.
A bio-electrochemical reactor (BER) operating at different cathode potentials ranging from -300 to -1000 mV (vs standard hydrogen electrode, SHE) was used to reduce adsorbable organic halogens (AOX) in pharmaceutical wastewater. Cathode polarization enriched the electron donor of the biological system. Thus, the AOX removal efficiency in the BER improved from 59.9% to 70.2%, and the AOX removal rate increased from 0.87 to 1.17 mg AOX/h when the cathode potential was reduced from -300 to -1000 mV with the addition of methyl viologen, a known redox mediator. The decrease of the cathode potential was also beneficial for methane production, and the inhibition of the methanogenic process enhanced the AOX removal. Additionally, cathode coulombic efficiency analysis demonstrated that the proportion of electrons used for AOX reduction decreases with decreasing potential, from 37.6% at -300 mV to 17.3% at -1000 mV, although the AOX removal efficiency improves.
一种生物电化学反应器（BER）在不同的阴极电位下运行，范围从-300 到-1000 mV（相对于标准氢电极，SHE），用于还原制药废水中的可吸附有机卤素（AOX）。阴极极化富集了生物系统的电子供体。因此，当阴极电位从-300 mV 降低到-1000 mV 时，通过添加已知的氧化还原介体甲紫精，BER 中的 AOX 去除效率从 59.9%提高到 70.2%，AOX 去除率从 0.87 增加到 1.17 mg AOX/h。降低阴极电位还有助于甲烷的生成，并且抑制产甲烷过程增强了 AOX 的去除。此外，阴极库仑效率分析表明，用于 AOX 还原的电子比例随着电位的降低而降低，从-300 mV 时的 37.6%降低到-1000 mV 时的 17.3%，尽管 AOX 去除效率提高。
