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Interrelation between sulphur and conductive materials and its impact on ammonium and organic pollutants removal in electroactive wetlands

Srivastava, P, Abbassi, R ORCID: 0000-0002-9230-6175, Yadav, AK, Garaniya, V ORCID: 0000-0002-0090-147X, Lewis, T ORCID: 0000-0001-6891-3840, Zhao, Y and Aminabhavi, T 2021 , 'Interrelation between sulphur and conductive materials and its impact on ammonium and organic pollutants removal in electroactive wetlands' , Journal of Hazardous Materials, vol. 419 , pp. 1-12 , doi: 10.1016/j.jhazmat.2021.126417.

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Abstract

This investigation is the first of its kind to evaluate the interrelation of sulphate (SO42-) with conductive materials as well as their individual and synergetic effects on the removal of ammonium and organic pollutants in electroactive wetlands, also known as constructed wetland (CW) - microbial fuel cell (MFC). The role of MFC components in CW was investigated to treat the sulphate containing wastewater under a long-term operation without any toxicity build-up in the system. A comparative study was also performed between CW-MFC and CW, where sulphate containing wastewater (S-replete) and without sulphate wastewater (S-deplete) was assessed. The S-replete showed high NH4+ removal than the S-deplete, and the requesnce of removal was: CW-MFC-replete > CW-MFC-deplete > CW-replete > CW-deplete. The chemical oxygen demand (COD) removal was high in the case of CW-MFC-replete, and the sequence of removal was CW-MFC-replete > CW-MFC-deplete > CW-deplete > CW-replete. X-ray photon spectroscopic study indicates 0.84% sulphur accumulation in CW-MFC-replete and 2.49% in CW-replete, indicating high sulphur precipitation in CW without the MFC component. The high relative abundance of class Deltaproteobacteria (7.3%) in CW-MFC-replete along with increased microbial diversity (Shannon index = 3.5) rationalise the symbiosis of sulphate reducing/oxidising microbes and its impact on the treatment performance and electrochemical activity.

Item Type: Article
Authors/Creators:Srivastava, P and Abbassi, R and Yadav, AK and Garaniya, V and Lewis, T and Zhao, Y and Aminabhavi, T
Keywords: microbial fuel cell, constructed wetland, constructed-wetland microbial fuel cell, sulphate wastewater, electricity generation
Journal or Publication Title: Journal of Hazardous Materials
Publisher: Elsevier Science Bv
ISSN: 0304-3894
DOI / ID Number: 10.1016/j.jhazmat.2021.126417
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Copyright 2021 Elsevier B.V. All rights reserved

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