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Influence of applied potential on treatment performance and clogging behaviour of hybrid constructed wetland-microbial electrochemical technologies

Citation

Srivastava, P and Abbassi, R and Yadav, A and Garaniya, V and Asadnia, M and Lewis, T and Khan, SJ, Influence of applied potential on treatment performance and clogging behaviour of hybrid constructed wetland-microbial electrochemical technologies, Chemosphere, 284 Article 131296. ISSN 0045-6535 (2021) [Refereed Article]

Copyright Statement

2021 Elsevier Ltd. All rights reserved.

DOI: doi:10.1016/j.chemosphere.2021.131296

Abstract

A two-stage hybrid Constructed Wetland (CW) integrated with a microbial fuel cell (MFC), and microbial electrolysis cell (MEC) has been assessed for treatment performance and clogging assessment and further compared with CW. The CW-MEC was operated with applied potential to the working electrode and compared with the performance of naturally adapted redox potential of the CW-MFC system. A complex synthetic municipal wastewater was used during the study, which was composed of trace metals, organics, inorganics, and dye. The study demonstrated that providing a constant potential to the working electrode in CW-MEC has resulted in high treatment performance and reduced sludge generation. The maximum chemical oxygen demand (COD), ammonium(NH4+), and phosphate (PO43−) removal achieved during treatment by CW-MEC at 24 h hydraulic retention time was 89 6%, 72 6% and 93 2%, respectively. ICP-MS results indicated that trace metal removals were also higher in CW-MEC than in CW alone (p<0.05). At the end of the experiment, significant volumetric change (total volume of the microcosm) occurred in CW (1.3L), which indicates high sludge generation, whereas it was lesser in CW-MEC (0.3L) and in CW-MFC (0.5L). Further, Energy Dispersive X-ray (EDX) spectroscopy results indicated low levels of metal precipitation in the CW-MEC system. Based on the Shannon diversity index, the CW-MEC was assessed to be characterised by high species richness and diversity. The observations from this study indicate that the applied potential at the working electrode has a significant impact on treatment performance and clogging behaviour of the system.

Item Details

Item Type:Refereed Article
Keywords:constructed wetland-microbial fuel cell, constructed wetland-microbial electrolysis cell, electroactive wetland, microbial electrolysis cell, microbial fuel cell, microbial electrochemical technologies
Research Division:Engineering
Research Group:Chemical engineering
Research Field:Wastewater treatment processes
Objective Division:Commercial Services and Tourism
Objective Group:Water and waste services
Objective Field:Water recycling services (incl. sewage and greywater)
UTAS Author:Srivastava, P (Miss KM Pratiksha Srivastava)
UTAS Author:Abbassi, R (Dr Rouzbeh Abbassi)
UTAS Author:Garaniya, V (Associate Professor Vikram Garaniya)
UTAS Author:Lewis, T (Associate Professor Trevor Lewis)
ID Code:145063
Year Published:2021
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2021-06-29
Last Modified:2021-09-30
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