期刊
JOURNAL OF CLEANER PRODUCTION
卷 245, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2019.118923
关键词
Microbial fuel cell (MFC); Air-exposed biocathode; Heterotrophic nitrifying/denitrifying (HND); Ammonia-contaminated wastewater; Sustainable treatment
资金
- National Natural Science Foundation of China [51525805, 51408580, 51727812]
- China Postdoctoral Science Foundation [2019M652840]
- West Light Foundation of CAS [2017XBZG_XBQNXZ_A1007]
- Youth Innovation Promotion Association Foundation of CAS [2018404]
- Department of Science and Technology of Sichuan Province China [2018SZ0324, 2018SZ0372, 2018JY0350]
Air-cathode microbial fuel cells (ACMFCs) have a remarkable potential in wastewater treatment for scalable-scale and sustainable operation. In this study, a heterotrophic nitrifying/denitrifying air-cathode microbial fuel cell (HND-ACMFC) was investigated with ammonia-contaminated wastewater in longterm operation. Over an operational period of 197 d, high removal efficiencies of chemical oxygen demand (COD, 91%), ammonia (99%), and total nitrogen (TN, 95%) were achieved stably and repeatedly, with continuous bioelectricity production of 0.72 A/m(3) and maximum power density of 100 mW/m(3). Microbial community structure analysis showed that majority of the dominated bacteria were affiliated with Thauera, Nitrosomonas, Arcobacter, Pseudomonas, Clostridium, and Geobacter, which are identified as nitrogen-removing bacteria (NRB) and/or electrochemically active bacteria (EAB). Scanning electron microscopic analysis demonstrated the presence of a considerable number of bacteria attached to the two electrodes, even in the air-exposed part of the biocathode. Moreover, energy input/output evaluation showed that the maximum normalized energy recovery still reached 0.12-0.21 kWh/kg COD when ammonia nitrogen was depleted efficiently. These results demonstrate that HND-ACMFC is a possible approach to accomplish simultaneous wastewater treatment and energy recovery, and also enhances the activity of functional microorganisms. Hence, HND-ACMFC may benefit the sustainable treatment of ammonia-contaminated wastewater by using MFC technology in view of economical configuration/ operation and high performance. (C) 2019 Elsevier Ltd. All rights reserved.
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