在空气阴极微生物燃料电池中去除 COD 的特性。
COD removal characteristics in air-cathode microbial fuel cells.
机构信息
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China; Department of Civil & Environmental Engineering, Penn State University, 231Q Sackett Building, University Park, PA 16802, USA.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Nangang District, Harbin 150090, PR China.
出版信息
Bioresour Technol. 2015 Jan;176:23-31. doi: 10.1016/j.biortech.2014.11.001. Epub 2014 Nov 7.
Exoelectrogenic microorganisms in microbial fuel cells (MFCs) compete with other microorganisms for substrate. In order to understand how this affects removal rates, current generation, and coulombic efficiencies (CEs), substrate removal rates were compared in MFCs fed a single, readily biodegradable compound (acetate) or domestic wastewater (WW). Removal rates based on initial test conditions fit first-order kinetics, but rate constants varied with circuit resistance. With filtered WW (100Ω), the rate constant was 0.18h(-)(1), which was higher than acetate or filtered WW with an open circuit (0.10h(-)(1)), but CEs were much lower (15-24%) than acetate. With raw WW (100Ω), COD removal proceeded in two stages: a fast removal stage with high current production, followed by a slower removal with little current. While using MFCs increased COD removal rate due to current generation, secondary processes will be needed to reduce COD to levels suitable for discharge.
微生物燃料电池 (MFC) 中的放电子微生物会与其他微生物竞争底物。为了了解这如何影响去除率、当前生成和库仑效率 (CE)，在以单一、易生物降解化合物（乙酸盐）或生活污水 (WW) 为食的 MFC 中比较了底物去除率。基于初始测试条件的去除率符合一级动力学，但速率常数随电路电阻而变化。使用过滤后的 WW（100Ω）时，速率常数为 0.18h(-)(1)，高于开路时的乙酸盐或过滤后的 WW（0.10h(-)(1)），但 CE 要低得多（15-24%）比乙酸盐。使用未经过滤的 WW（100Ω）时，COD 去除分两个阶段进行：电流产生的快速去除阶段，随后电流很少的缓慢去除阶段。虽然使用 MFC 会因电流产生而提高 COD 去除率，但需要进行二次处理才能将 COD 降低到适合排放的水平。
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