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Reduction of Cu(II) and simultaneous production of acetate from inorganic carbon by Serratia Marcescens biofilms and plankton cells in microbial electrosynthesis systems

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journal contribution
posted on 11.03.2019 by Yitong Qian, Liping Huang, Peng Zhou, Fuping Tian, Gianluca Li-Puma
© 2019 Simultaneous Cu(II) reduction (6.42 ± 0.02 mg/L/h), acetate production (1.13 ± 0.02 mg/L/h) from inorganic carbon (i.e., CO 2 sequestration), and hydrogen evolution (0.0315 ± 0.0005 m 3 /m 3 /d) were achieved in a Serratia marcescens Q1 catalyzed microbial electrosynthesis system (MES). The biofilms released increasing amounts of extracellular polymeric substances (EPS) with a higher compositional diversity and stronger Cu(II) complexation, compared to the plankton cells, at higher Cu(II) concentrations (up to 80 mg/L) and circuital currents (cathodic potential of −900 mV vs. standard hydrogen electrode (SHE)). Moreover, the biofilms reduced Cu(II) to Cu(0) more effectively than the plankton cells. At Cu(II) concentrations below 80 mg/L, the dehydrogenase activity in the biofilms was higher than in the plankton cells, and increased with circuital current, which was converse to the lower activities of catalase (CAT), superoxide dismutase (SOD) and antioxidative glutathione (GSH) in the biofilms than the plankton cells, although all these physiological activities were positively correlated with the concentration of Cu(II). This is the first study that evaluates the EPS constituents and the physiological activities of the biofilms and the plankton cells in the MESs, that favors the production of acetate from CO 2 sequestration and the simultaneous reduction of Cu(II) from organics-barren waters contaminated with heavy metals.

Funding

The authors gratefully acknowledgefinancial support from the Nat-ural Science Foundation of China (Nos. 21777017 and 51578104)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Science of the Total Environment

Volume

666

Pages

114 - 125

Citation

QIAN, Y. ... et al., 2019. Reduction of Cu(II) and simultaneous production of acetate from inorganic carbon by Serratia Marcescens biofilms and plankton cells in microbial electrosynthesis systems. Science of the Total Environment, 666, pp. 114 - 125

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Science of the Total Environment and the definitive published version is available at https://doi.org/10.1016/j.scitotenv.2019.02.267

Acceptance date

17/02/2019

Publication date

2019-02-18

Copyright date

2019

ISSN

0048-9697

eISSN

1879-1026

Language

en

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