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论文类型：期刊论文

发表时间：2015-04-15

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：Scopus、EI、SCIE

卷号：266

页面范围：241-248

ISSN号：1385-8947

关键字：Bioelectrochemical system; Cathodic denitrification; Anodic oxidation; Heterotrophic bacteria

摘要：Carbon sources shortage of biological denitrification is a great challenge in municipal wastewater treatment. Bioelectrochemical system (BES) as a new approach for denitrification has not well been established to treat low-C/N wastewater. In this study, the nitrate removal was compared in a traditional anaerobic reactor (R1), two anaerobic reactors with C-C electrodes (R2) and Fe-C electrodes (R3), respectively. The results demonstrated that the electrodes could improve significantly the denitrification at low C/N, and Fe further enhanced its performance. The increased denitrification was a result from the combination of anodic oxidation and cathodic denitrification. The anodic oxidation competed with other heterotrophic processes for utilizing carbon sources to increase denitrification. The higher nitrate removal in R3 was mainly attributed that more exoelectrogenic bacteria were enriched with the presence of Fe to enhance the anodic oxidation and better drive the cathodic denitrification to occur. (C) 2015 Elsevier B.V. All rights reserved.