eCite Digital Repository

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

Citation

Srivastava, P and Abbassi, R and Yadav, AK and Garaniya, V and Kumar, N and Khan, SJ and Lewis, T, Enhanced chromium(VI) treatment in electroactive constructed wetlands: influence of conductive material, Journal of Hazardous Materials, 387 Article 121722. ISSN 0304-3894 (2020) [Refereed Article]

Copyright Statement

2019 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.jhazmat.2019.121722

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) (37.5 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 Details

Item Type:Refereed Article
Keywords:constructed wetland, electro-wetland, bioelectrochemical systems, chromium treatment, electron transfer
Research Division:Engineering
Research Group:Environmental engineering
Research Field:Environmentally sustainable engineering
Objective Division:Mineral Resources (Excl. Energy Resources)
Objective Group:Environmentally sustainable mineral resource activities
Objective Field:Management of water consumption by mineral resource activities
UTAS Author:Srivastava, P (Miss KM Pratiksha Srivastava)
UTAS Author:Garaniya, V (Associate Professor Vikram Garaniya)
UTAS Author:Lewis, T (Associate Professor Trevor Lewis)
ID Code:136205
Year Published:2020
Web of Science® Times Cited:6
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2019-12-05
Last Modified:2021-07-19
Downloads:0

Repository Staff Only: item control page