Simultaneous sulfate and zinc removal from acid wastewater using an acidophilic and autotrophic biocathode
Simultaneous sulfate and zinc removal from acid wastewater using an acidophilic and autotrophic biocathode
复制标题
使用嗜酸性和自养生物阴极同时去除酸性废水中的硫酸盐和锌
DOI：
10.1016/j.jhazmat.2015.10.050
复制
发表时间：
2016
影响因子：
13.6
通讯作者：
Xiang Yinbo
中科院分区：
文献类型：
--
作者：
Teng Wenkai;Liu Guangli;Luo Haiping;Zhang Renduo;Xiang Yinbo
本研究的目的是开发具有新型嗜酸自养生物阴极的微生物电解电池（MEC），用于处理酸性废水。以嗜酸性硫酸盐还原菌为催化剂，研制了一种生物阴极。采用200 mg L - 1硫酸盐和不同Zn浓度（0、15、25和40 mg L - 1）的人工废水作为MEC阴极电解质。嗜酸生物阴极以desulfovibrio sp.为主，丰度为66%（82%的desulfovibrio序列与desulfovibrio simplex相似），硫酸盐还原率为32 g m−3d−1。添加15 mg L−1Zn时，MEC的硫酸盐还原率提高了16%。ZnS的形成减轻了硫化物的抑制作用，加快了硫酸盐的还原速度。当添加15和25 mg L−1Zn时，废水中Zn的去除率达到99%以上。由于硫酸盐还原产生的硫化物和pH值升高，阴极液中溶解的锌离子转化为不溶性锌化合物，如硫化锌和氢氧化锌。具有亲酸性和自养型生物阴极的MEC可作为同时去除酸性废水（如酸性矿山废水）中的硫酸盐和金属的替代方法。
The aim of this study was to develop microbial electrolysis cell (MEC) with a novel acidophilic and autotrophic biocathode for treatment of acid wastewater. A biocathode was developed using acidophilic sulfate-reducing bacteria as the catalyst. Artificial wastewater with 200 mg L−1sulfate and different Zn concentrations (0, 15, 25, and 40 mg L−1) was used as the MEC catholyte. The acidophilic biocathode dominated byDesulfovibrio sp.with an abundance of 66% (with 82% ofDesulfovibrio sequencessimilar toDesulfovibrio simplex) and achieved a considerable sulfate reductive rate of 32 g m−3d−1. With 15 mg L−1Zn added, the sulfate reductive rate of MEC improved by 16%. The formation of ZnS alleviated the inhibition from sulfide and sped the sulfate reduction. With 15 and 25 mg L−1Zn added, more than 99% of Zn was removed from the wastewater. Dissolved Zn ions in the catholyte were converted into insoluble Zn compounds, such as zinc sulfide and zinc hydroxide, due to the sulfide and elevated pH produced by sulfate reduction. The MEC with acidophilic and autotrophic biocathode can be used as an alternative to simultaneously remove sulfate and metals from acid wastewaters, such as acid mine drainage.