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Enhanced chromium(VI) treatment in electroactive constructed wetlands: influence of conductive material

Srivastava, P, Abbassi, R, Yadav, AK, Garaniya, V ORCID: 0000-0002-0090-147X, Kumar, N, Khan, SJ and Lewis, T ORCID: 0000-0001-6891-3840 2020 , 'Enhanced chromium(VI) treatment in electroactive constructed wetlands: influence of conductive material' , Journal of Hazardous Materials, vol. 387 , pp. 1-12 , doi: 10.1016/j.jhazmat.2019.121722.

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Abstract

A constructed wetland (CW) microcosm based on conductive graphite gravel was investigated for hexavalent chromium (Cr(VI)) treatment from synthetic wastewater. Its performance was evaluated and compared with a traditional gravel-based CW microcosm. The microcosms were operated at varying initial Cr(VI) concentrations (5−20 mg/L) and hydraulic retention times (HRT) (3–7.5 h). Near complete treatment (99.9 ± 0.06 %) was achieved in the graphite-based microcosm throughout the experiment. The performance was consistently high throughout with 42.9 % improvement in Cr (VI) treatment compared to a traditional gravel microcosm. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) analysis indicated that chromium was adsorbed to microbial biofilms. Moreover, microbial diversity profiling suggested that the microbial population in both microcosms differed in diversity and communities. The results suggest that the use of conductive materials in CW significantly enhances the treatment of Cr(VI) and more importantly, allows microbial activity even at high levels of Cr(VI) in the CW.

Item Type: Article
Authors/Creators:Srivastava, P and Abbassi, R and Yadav, AK and Garaniya, V and Kumar, N and Khan, SJ and Lewis, T
Keywords: constructed wetland, electro-wetland, bioelectrochemical systems, chromium treatment, electron transfer
Journal or Publication Title: Journal of Hazardous Materials
Publisher: Elsevier Science Bv
ISSN: 0304-3894
DOI / ID Number: 10.1016/j.jhazmat.2019.121722
Copyright Information:

© 2019 Elsevier B.V. All rights reserved.

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