Journal
JOURNAL OF CLEANER PRODUCTION
Volume 263, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.121596
Keywords
Hydrogen-oxidizing bacteria (HOB); Water electrolysis; Current density; Mixed culture; Power to HOB
Categories
Funding
- National Science Foundation of China [51878175, 51478447]
- National Key Research and Development Program of China [2018YFE0107000]
- Program for Innovative Research Team in Science and Technology in Fujian Province University (IRTSTFJ)
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Hydrogen-oxidizing bacteria (HOB) can utilize hydrogen, oxygen, and carbon dioxide as electron donor, electron acceptor, and carbon source, respectively. These bacteria can convert hydrogen and carbon dioxide to biomass which is different from hydrophilic denitrification. Power to HOB, a new supplementary to Power to Gas, was proposed and demonstrated in this study, in which HOB were cultivated via in-situ consuming hydrogen generated by water electrolysis. The objects of this work were to explore the effect of current density on HOB activity and microbial community. The results showed good activity of enriched HOB that the nitrate consumption rate was 21 mg/L/d in batch and continuous modes under the current density (CD) of 2.14 mA/cm(2). The cyclic voltammetry curve demonstrated the electric activity of HOB that redox peaks were 0.330 V and 0.195 V at corresponding CDs of 2.14 mA/cm(2) and 4.29 mA/cm(2), respectively. Finally, the community spectra revealed that the percentage of Cupriavidus sp. TA19 decreased by 15.59% (2.14 mA/cm(2) vs 4.29 mA/cm(2)), and Pseudonocardia sp. YK32 increased by 38.31%. Moreover, Cupriavidus sp. TA19 was reported as HOB for polyhydroxyalkanoate (PHA, degradable plastics) production. Pseudonocardia sp. YK32 was also reported as HOB and the functionwas unknown. Thus, Power to HOB can be a new supplementary to Power to Gas and the results extend HOB applications. (C) 2020 Elsevier Ltd. All rights reserved.
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