基于不同形式MFC的PRB对AMD处理效果影响

基于SRB生物阴极MFC的可渗透反应墙（SRB-PRB）原位处理酸性矿井水，MFC结构与MFC 在SRB-PRB布局设计是影响预调节C/S，pH，M2+浓度效果的主要因素。实验构造了2种MFC结构（圆筒型、平板MFC）及在PRB中3种布局方式（点阵、顺流、横向渗流），用于相同体积活性填料的可渗透反应墙中，研究不同结构MFC对AMD的预处理效果。AMD水质为pH=3，ρ（SO2-4）=3 000 mg/L，Fe2+，Cu2+，Zn2+质量浓度均为30 mg/L，调节HRT为3,2.5,1.5 d。结果表明，MFC对AMD预处理调节效果与污泥碳源可利用性、MFC结构及在PRB中的布置方式有关，影响程度:碳源＞MFC结构＞布置方式。圆筒型MFC结构优于平板型，功率密度是平板型的2倍。3种布局方式圆筒点阵式结构PRB出水pH值在7左右，Fe2+,Cu2+,Zn2+去除率分别为96.2%～100%,99.6%～100%，95.3%～99.3%，且均高于高于平板型；SO2-4去除速率平均高于平板式7 g/（m3·h）左右。圆筒型MFC点阵布局方式表现出性能稳定、设计灵活的特点。

Effects of treatment efficiency of AMD through the PRB based ondifferent structure of MFC

The permeable reactive barrier based on sulfate-reducing bacteria biocathodes MFC (SRB-PRB) was used in the in-situ treatment of acid mine water,and MFC structure and its layout design on SRB-PRB,pH value,ratio of C/S and heavy metal ion concentration are its main influences for pre-condition capacity.Two MFC structure (cylindrical,flat) and three different layouts (lattice,downstream,lateral flow)in SRB-PRB were conducted for the same volume reactive medias in the PRB for the investigation of AMD pre-condition efficiency under the different MFC structure.The effluent concentration of Fe2+,Cu2+ and Zn2+ were 30 mg/L under the AMD conditions:pH=3 and ρ（SO2-4）=3 000 mg/L.Experimental results show that the effects of MFC on precondition is associated with the availability of sludge carbon source,the MFC structure and the PRB layout,the influence degree are as follows:carbon source>MFC structure>layout.Cylindrical MFC has a better performance than flat MFC,the maximum power densities is twice of flat MFC.The pH values are higher than the flat type,and is kept at about 7.0 stably.The percent removal of Fe2+,Cu2+ and Zn2+ are 96.2%-100%,99.6%-100%，95.3%-99.3% respectively.The average removal of SO2-4 of cylindrical MFC is 7 g/(m3·h) higher than flat type.Lattice layout in SRB-PRB presents a characterizes of stable performance and flexible design.