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Enhanced chromium(VI) treatment in electroactive constructed wetlands: influence of conductive material
journal contribution
posted on 2023-05-20, 08:46 authored by Srivastava, P, Abbassi, R, Yadav, AK, Vikrambhai GaraniyaVikrambhai Garaniya, Kumar, N, Khan, SJ, Trevor LewisTrevor LewisA 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.
Funding
Tasmanian Community Fund
History
Publication title
Journal of Hazardous MaterialsVolume
387Article number
121722Number
121722Pagination
1-12ISSN
0304-3894Department/School
Australian Maritime CollegePublisher
Elsevier Science BvPlace of publication
Po Box 211, Amsterdam, Netherlands, 1000 AeRights statement
© 2019 Elsevier B.V. All rights reserved.Repository Status
- Restricted