利用含Cu(Ⅱ)废水强化微生物燃料电池处理含Cr(Ⅵ)废水  

Utilization of Copper(Ⅱ) Wastewater for Enhancing the Treatment of Chromium(Ⅵ) Wastewater in Microbial Fuel Cells

作　　者：熊晓敏 吴夏芫 贾红华 雍晓雨 周俊 韦萍 

机构地区：[1]南京工业大学生物与制药工程学院生物能源研究所,南京211800

出　　处：《环境科学》2017年第10期4262-4270,共9页Environmental Science

基　　金：国家重点基础研究发展规划(973)项目(2013CB733500);国家重点研发计划项目(2016YFE0112800);国家科技支撑计划项目(2014BAC33B00);江苏省重点研发计划项目(BE2016389)

摘　　要：采用双室微生物燃料电池(MFC)反应器,考察了不同Cr(Ⅵ)/Cu(Ⅱ)浓度配比和外电阻条件下添加Cu(Ⅱ)对MFC阴极去铬的影响.结果表明,MFC阴极处理Cr(Ⅵ)废水时,添加一定浓度的Cu(Ⅱ)废水能提高MFC阴极去铬的效率,且添加Cu(Ⅱ)的浓度越高,提高的效果越明显.在所设置外电阻(10、500、1 000、2 000Ω)条件下,随着外电阻的降低,Cu(Ⅱ)对MFC阴极去铬的强化作用越明显.最终在Cr(Ⅵ)/Cu(Ⅱ)质量浓度配比1∶4,外电阻10Ω时,MFC阴极Cr(Ⅵ)的去除率达91.00%,较单独去铬时(39.13%)提高了132.57%.对反应后的电极进行扫描电镜附加能谱分析及X射线光电子能谱分析表明,Cr(Ⅵ)在阴极的还原产物为不导电Cr_2O_3,其附着于电极表面引起电极导电性能下降,而添加Cu(Ⅱ)后其在阴极还原为Cu和Cu_2O,该产物则在一定程度上提高了电极导电性能,缓解Cr_2O_3沉积造成的阴极钝化,从而强化了MFC阴极去铬的效率.The effect of copper（ Ⅱ） wastewater addition on the treatment of chromium（ Ⅵ） wastewater in dual-chamber microbial fuel cells（ MFCs） was investigated for different Cr（ Ⅵ）/Cu（ Ⅱ） concentration ratios（ 2 ∶ 1,1 ∶ 1,1 ∶ 2,1 ∶ 4） and external resistances（ 10,500,1 000,2 000 Ω）. The results demonstrated that the addition of Cu（ Ⅱ） and Cr（ Ⅵ） into the cathode chamber of MFCs could enhance the Cr（ Ⅵ） removal efficiency. The Cr（ Ⅵ） removal efficiency increased with the increase in the Cr（ Ⅵ）/Cu（ Ⅱ）concentration ratio. The Cu（ Ⅱ） on the Cr（ Ⅵ） removal efficiencies increased with the decrease of external resistance. The highest Cr（ Ⅵ） removal efficiency achieved was 91. 00% in MFC at the Cr（ Ⅵ）/Cu（ Ⅱ） concentration ratio of 1∶ 4 and external resistance of10 Ω,which was 132. 57% higher than the MFC with Cr（ Ⅵ） only（ 39. 13%）. The scanning electron microscopy with coupled energy dispersive spectroscopy（ SEM-EDS） and X-ray photoelectron spectroscopy（ XPS） analyses of the cathode electrode at the end of the experiments indicated that Cr（ Ⅵ） reduced to non-conductive Cr（ Ⅲ） deposits（ Cr2O3） on the cathode electrode,resulting in cathode deactivation which blocked the electron transfer. However,the addition of Cu（ Ⅱ） could improve the electrical conductivity of the cathode due to its conductive reduzates（ copper and Cu2O） on the cathode which could reduce the cathode deactivation and subsequently enhance the Cr（ Ⅵ） removal efficiency.

关 键 词：微生物燃料电池 Cr(Ⅵ) Cu(Ⅱ) 阴极钝化 重金属废水 

分 类 号：X703.1[环境科学与工程—环境工程]