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论文类型：期刊论文

发表时间：2014-10-01

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：SCIE、EI、Scopus

卷号：253

页面范围：281-290

ISSN号：1385-8947

关键字：Microbial electrolysis cell; Biocathode; Co(II) reduction; Methane; Acetate

摘要：Cobalt was successfully recovered with simultaneous methane and acetate production in biocathode microbial electrolysis cells (MECs). At an applied voltage of 0.2 V. 88.1% of Co(II) was reduced with concomitantly achieving yields of 0.266 +/- 0.001 mol Co/mol COD, 0.113 +/- 0.000 mol CH4/mol COD, and 0.103 +/- 0.003 mol acetate/mol COD. Energy efficiencies relative to the electrical input were 21.2 +/- 0.05% (Co), 100.9 +/- 3.2% (CH4), and 1.0 +/- 0.01% (acetate), and overall energy efficiencies relative to both electrical input and energy of anodic substrate averaged 3.7 +/- 0.05% (Co), 17.5 +/- 1.4% (CH4) and 0.5 +/- 0.001% (acetate). Applied voltage, initial Co(II) concentration, and temperature affected system performance. The apparent activation energy (E-a) obtained in MECs was 26.7 kJ/mol compared to 40.5 kJ/mol in the abiotic controls, highlighting the importance of cathodic microbial catalysis to Co(II) reduction. Dominant microorganisms most similar to Geobacter psychrophilus, Acidovorax ebreus, Diaphorobacter oryzae, Pedobacter duraquae, and Prolbdbacter bellariivorans were observed on the biocathodes. This study provides a new process for cobalt recovery and recycle of spent lithium ion batteries with simultaneous methane and acetate production in the biocathode MECs. (C) 2014 Elsevier B.V. All rights reserved.