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In-situ enrichment and removal of Cu(II) and Cd(II) from low-strength wastewater by a novel microbial metals enrichment and recovery cell (MMERC)
Journal of Power Sources ( IF 8.1 ) Pub Date : 2020-01-19 , DOI: 10.1016/j.jpowsour.2019.227627
Qing Jiang , Xiangru Song , Jia Liu , Yuqiang Shao , Weihua He , Yujie Feng

Removal of Copper (Cu) and Cadmium (Cd) at low concentrations is attracting more attention due to the cumulative toxicity and difficulty in the removal process. In this study, a novel microbial metals enrichment and recovery cell (MMERC) is proposed for efficient and cost-effective recovery of Cu(II) and Cd(II) at low concentrations. The superiority of the proposed system is that the metal ions are in-situ separated from wastewater and enriched in the cathodic chamber driven by self-generated electricity, as well as recovered simultaneously taking advantage of the produced caustic. In the operation, Cu(II) and Cd(II) in the contaminated wastewater decrease from initial concentrations of 5 mg L−1 to less than 0.2 mg L−1, and these separated metals are highly enriched in the catholyte and removed simultaneously with 99.0% for Cu(II) and 96.5% for Cd(II). The system shows great separation and enrichment performance with increased metals concentrations to 20 mg L−1. A 20-cycle operation demonstrates long-term stability, as the removals remained above 95%, and the deposited hydroxides have no significant effects on the cathode. The energy balance analysis further demonstrates the great promise of the MMERC system in energy-efficient treatment of metal contaminated wastewater.



中文翻译:

通过新型微生物金属富集和回收池(MMERC)原位富集和从低强度废水中去除Cu(II)和Cd(II)

由于累积毒性和去除过程中的困难,低浓度铜(Cu)和镉(Cd)的去除引起了更多关注。在这项研究中,提出了一种新型的微生物金属富集和回收池(MMERC),用于在低浓度下高效,经济地回收Cu(II)和Cd(II)。所提出系统的优势在于,金属离子与废水原位分离,并在由自发电驱动的阴极室中富集,并利用产生的苛性碱同时回收。在操作中,被污染废水中的Cu(II)和Cd(II)从初始浓度5 mg L -1降低到小于0.2 mg L -1,这些分离的金属在阴极电解液中高度富集,同时被去除,其中Cu(II)为99.0%,Cd(II)为96.5%。随着金属浓度增加至20 mg L -1,该系统显示出出色的分离和富集性能。20次循环操作显示出长期稳定性,因为去除率保持在95%以上,并且沉积的氢氧化物对阴极没有显着影响。能量平衡分析进一步证明了MMERC系统在高能效处理金属污染废水方面的巨大前景。

更新日期:2020-01-21
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