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

Srivastava, P, Abbassi, R ORCID: 0000-0002-9230-6175, Yadav, A, Garaniya, V ORCID: 0000-0002-0090-147X, Asadnia, M, Lewis, T ORCID: 0000-0001-6891-3840 and Khan, SJ 2021 , 'Influence of applied potential on treatment performance and clogging behaviour of hybrid constructed wetland-microbial electrochemical technologies' , Chemosphere, vol. 284 , pp. 1-12 , doi: 10.1016/j.chemosphere.2021.131296.

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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 Type: Article
Authors/Creators:Srivastava, P and Abbassi, R and Yadav, A and Garaniya, V and Asadnia, M and Lewis, T and Khan, SJ
Keywords: constructed wetland-microbial fuel cell, constructed wetland-microbial electrolysis cell, electroactive wetland, microbial electrolysis cell, microbial fuel cell, microbial electrochemical technologies
Journal or Publication Title: Chemosphere
Publisher: Elsevier Science Bv
ISSN: 0045-6535
DOI / ID Number: 10.1016/j.chemosphere.2021.131296
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© 2021 Elsevier Ltd. All rights reserved.

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