应用一种无膜生物电化学系统还原冶铋废水中Cu(Ⅱ)的研究  

Cu(Ⅱ)Reduction from Bismuth Metallurgical Wastewater by a Membrane-free Bioelectrochemical System

作　　者：陶虎春[1] 王俊彦[1] 张丽娟[1] 李金波[1] 

机构地区：[1]北京大学深圳研究生院环境与能源学院,深圳市重金属污染控制与资源化重点实验室,广东深圳518055

出　　处：《应用基础与工程科学学报》2013年第4期626-637,共12页Journal of Basic Science and Engineering

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07212-001);深圳市基础研究重点项目(JC201005260099A);重点实验室组建项目(CXB201111240110A)

摘　　要：考察了将一种放大的无膜生物电化学系统(Membrane-freeBioelectrochemical Systems,MF-BES)应用于阴极还原实际铋冶炼废水中Cu(Ⅱ)的可行性.在选定的预处理条件下(pH=2.47—3.27),废水中Fe3+沉淀分离的去除率最高达到(99.60±0.04)%,同时Cu2+的损失率可控制在(9.31±0.06)%.循环伏安分析显示,酸性废水(pH=2.0)中的Fe3+/Fe2+等离子使Cu(Ⅱ)/Cu(Ⅰ)的还原峰负向移动,干扰铜还原反应的发生,加大了铜还原的难度.以含铜的铋冶炼工艺废水作为阴极液,Cu(Ⅱ)还原去除过程为一级动力学反应(R2=0.985).120h内,MF-BES中的总铜质量由(87.56±4.38)mg降至(0.74±0.04)mg,去除率大于99%,出水含铜浓度(T[Cu]=0.15mg/L)符合国家污水综合排放(GB8978-1996)一级标准.Cu(Ⅱ)被还原为晶体单质Cu,Cu2O和CuCl,并沉积在阴极板上.A scaling-up membrane-free bioelectrochemical system （MF-BES）was tested for cathodic reduction of Cu （ II ） in industrial wastewater from bismuth metallurgical process. When the pH of wastewater was controlled at 2.47--3.27 during the pretreatment period, up to （ 99.60 ± 0.04） % of Fe3＋was separated and removed, while only （ 9. 31 ±0. 06 ） % of Cu2 ~ was precipitated by OH-. Cyclic vohammetry analysis showed that the observed reduction peaks of Cu（ U ）/Cu（ I ）tended to more negative potentials in the presence of Fe （III）/Fe （II）which disturbing the reduction of copper in actual wastewater. In the cathode chamber of MF-BES, the removal of copper from bismuth metallurgical wastewater fitted the first order kinetic mode （R2 =0. 985）. The water quality of effluent（ T[ Cu] = 0. 15mg/L）reached the highest level of integrated national wastewater discharge standard （ GB8978-1996 ）, the total mass of copper decreased from（ 87.56 ± 4.38 ）mg to（0.74±0. 04）mg with a removal efficiency of higher than 99% within 120h. Cu （ II ）was reduced and recovered as solid-state, polyhedral-habit-feature and isometric-lattice-structure copper crystals Cu, Cu20 and CuCl on cathodes.

关 键 词：生物电化学系统 无膜 铜还原 铋冶炼 废水 

分 类 号：X703.1[环境科学与工程—环境工程]