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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 (1.3 L), which indicates high sludge generation, whereas it was lesser in CW-MEC (0.3 L) and in CW-MFC (0.5 L). 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 |
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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 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 |
Web of Science® Times Cited: | 18 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2021-06-29 |
Last Modified: | 2021-09-30 |
Downloads: | 0 |
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