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Pilot-scale benthic microbial electrochemical system (BMES) for the bioremediation of polluted river sediment
A benthic microbial electrochemical system (BMES) of 350 L is built for the bioremediation of river sediment (Ashi river, Harbin, China). Carbon mesh anode with honeycomb-structure supports and activated carbon cathodes are applied for the construction. Synthesis wastewater with glucose is added to...
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Published in: | Journal of power sources 2017-07, Vol.356, p.430-437 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | A benthic microbial electrochemical system (BMES) of 350 L is built for the bioremediation of river sediment (Ashi river, Harbin, China). Carbon mesh anode with honeycomb-structure supports and activated carbon cathodes are applied for the construction. Synthesis wastewater with glucose is added to simulate the natural condition of Ashi River as an intermittent pollutant-holding water body and accelerate the removal of accumulated bio-refractory organic contents in sediment, represented by the concentration changes of polycyclic aromatic hydrocarbons, as the co-metabolic substrate for bacteria. The effluent TOC in the water layer of BMES is stable at 40 ± 2 mg L−1 and further reduced to 19 ± 5 mg L−1 after the addition of synthesis wastewater, while the removal of polycyclic aromatic hydrocarbons(Benzo(b)fluoranthene, Benzo(k)fluoranthene and Benzo(a)pyrene) in sediment samples reaches 74%. A maximum power density of 63 ± 3 mW m−2 is achieved by BMES, which decrease to 42 ± 2 mW m−2 due to cathode degradation and further reduce to 30 ± 3 mW m−2 attributed to substrate limitation at the end of operation. Community analyses show the diversity of anode community is improved during operation and the abundance of Chloroflexi, Firmicutes and exoelectrogenic microbes like G. psychrophilus increase.
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•Pilot-scale BMES was constructed for the bioremediation of polluted river sediment.•Addition of synthetic wastewater enhanced the removal of accumulated organics in sediment.•The BMES reduced 89% of TOC in water phase and 70% in sediment around anode.•The BMES was operated in anode limitation condition in long time operation. |
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ISSN: | 0378-7753 1873-2755 |
DOI: | 10.1016/j.jpowsour.2017.03.066 |