基于不同形式MFC的PRB对AMD处理效果影响

Effects of treatment efficiency of AMD through the PRB based on different structure of MFC

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,p H,M^(2+)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p H=3,ρ(SO^(2-)_4)=3 000 mg/L,Fe^(2+),Cu^(2+),Zn^(2+)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p H值在7左右,Fe^(2+),Cu^(2+),Zn^(2+)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;SO^(2-)_4去除速率平均高于平板式7 g/(m^3·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。

The permeable reactive barrier based on sulfate-reducing bacteria biocathodes MFC（SRB-PRB） was usedin the in-situ treatment of acid mine water,and MFC structure and its layout design on SRB-PRB,p H value,ratio ofC/S and heavy metal ion concentration are its main influences for pre-condition capacity. Two MFC structure（cylin-drical,flat） and three different layouts（lattice,downstream,lateral flow） in SRB-PRB were conducted for the samevolume reactive medias in the PRB for the investigation of AMD pre-condition efficiency under the different MFCstructure. The effluent concentration of Fe^2＋,Cu^2＋and Zn^2＋were 30 mg/L under the AMD conditions：p H = 3 andρ（SO4^2-）= 3 000 mg/L. Experimental results show that the effects of MFC on precondition is associated with the avail-ability 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 densitiesis twice of flat MFC. The p H values are higher than the flat type,and is kept at about 7. 0 stably. The percent removalof Fe^2＋,Cu^2＋and Zn^2＋are 96. 2%-100%,99. 6%-100%,95. 3%-99. 3% respectively. The average removal of SO4^2- of cylindrical MFC is 7 g/（m^3·h） higher than flat type. Lattice layout in SRB-PRB presents a characterizes of stableperformance and flexible design.