Effective bioremediation of Cu(II) contaminated waters with immobilized sulfate-reducing bacteria-microalgae beads in a continuous treatment system and mechanism analysis

文献类型： 外文期刊

第一作者： Li, Yongchao

作者： Li, Yongchao;Yang, Xiaoyan;Geng, Bing;Liu, Xue

作者机构：

关键词： immobilized sulfate-reducing bacteria; microalgae; copper mine wastewater

期刊名称：JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY （ 影响因子：3.174； 五年影响因子：3.137 ）

ISSN： 0268-2575

年卷期： 2018 年 93 卷 5 期

页码：

收录情况： SCI

摘要： BACKGROUNDMicroalgae which have greater biodegradable fractions than other organics were chosen as a carbon source for sulfate-reducing bacteria (SRB). Immobilized SRB-microalgae beads were then prepared and used for bioremediation of synthetic copper mine wastewater. RESULTSHydrolysis fermentation of the microalgae was observed and it was noted that the microalgae were first degraded to volatile fatty acids by co-existing fermentative bacteria; they then served as a carbon source for SRB. Freshly prepared immobilized SRB beads not only possessed high mechanical strength and mass transfer ability, but also showed better sulfate reduction than that of suspended SRB. Immobilized SRB-Scenedesmus obliquus beads packed in the upflow bioreactor were suitable for the treatment of copper mine wastewater, as shown by the high removal efficiency of their sulfate (182.17 mg SO42- g(-1) microalgae day(-1)) and copper ions (45.28 mg Cu2+ g(-1) microalgae day(-1)), and low discharge of chemical oxygen demand. After the reaction, metal sulfides were not produced on the bead surfaces, but likely within them. CONCLUSIONSThe anaerobic bioreactor, filled with immobilized SRB-Scenedesmus obliquus beads, demonstrated excellent removal efficiency and low discharge of chemical oxygen demand, which may provide a promising strategy for dealing with heavy metal pollution in water. (c) 2017 Society of Chemical Industry

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