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Denitrification in a low carbon environment of a constructed wetland incorporating a microbial electrolysis cell


Srivastava, P and Yadav, AK and Abbassi, R and Garaniya, V and Lewis, T, Denitrification in a low carbon environment of a constructed wetland incorporating a microbial electrolysis cell, Journal of Environmental Chemical Engineering, 6, (4) pp. 5602-5607. ISSN 2213-3437 (2018) [Refereed Article]

Copyright Statement

© 2018 Elsevier Ltd.

DOI: doi:10.1016/j.jece.2018.08.053


The main aim of this study was to explore the possibility of denitrification under low carbon conditions in a microbial electrolysis cell (MEC) integrated into a constructed wetland (CW). To our knowledge, this is the first systematic study of the incorporation of an MEC into a CW for enhancing denitrification. CWs are an efficient and low-cost technology for wastewater treatment facing problems in denitrification under low carbon conditions. Two CW-microcosms were fabricated: one included an MEC arrangement with granular graphite electrodes attached to a power source and the other with a microcosm fabricated with normal stone gravel as a control. These microcosms were fed with synthetic wastewater containing 50 mg/l of nitrate-nitrogen (NO3-N) with different ratios of organic carbon. Carbon to nitrogen ratio (C: N) were kept to 2:1, 1:1 and 0.5:1. The maximum concentration of organic carbon was 100 mg/l, subsequently decreased to 50 mg/l to 25 mg/l. The highest percentage removal achieved from CW-MEC in C: N ratios of 2:1 were 69.3% on 0.583 mA applied current, whereas the control microcosm’s removal efficiency on the same C:N was 66.2%. The outcomes of this study show that the NO3-N removal was always higher in the MEC integrated CW compared to the normal CW. The study concludes that the higher denitrification is possible by incorporation of an MEC into a constructed wetland under low carbon condition. This approach can provide a new direction for denitrification enhancement in a CW.

Item Details

Item Type:Refereed Article
Keywords:denitrification, microbial electrolysis cell, constructed wetland-microbial electrolysis cell, electron donor, electrode
Research Division:Engineering
Research Group:Environmental engineering
Research Field:Environmentally sustainable engineering
Objective Division:Manufacturing
Objective Group:Environmentally sustainable manufacturing activities
Objective Field:Management of liquid waste from manufacturing activities (excl. water)
UTAS Author:Srivastava, P (Miss Pratiksha Srivastava)
UTAS Author:Garaniya, V (Associate Professor Vikram Garaniya)
UTAS Author:Lewis, T (Associate Professor Trevor Lewis)
ID Code:128091
Year Published:2018
Web of Science® Times Cited:30
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2018-09-03
Last Modified:2021-07-19

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