Journal
CHEMOSPHERE
Volume 271, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.129593
Keywords
Emerging contaminants; Meso-scale setup; Microbial electrolysis cells; Microbial fuel cells; Real urban wastewater
Categories
Funding
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [676070]
- Government of Catalonia [2017 SGR 1029]
- Spanish Ministry of Economy and Competitiveness [IJCI-2017-34601]
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The study found that under real wastewater conditions, CW-BES did not show significant advantages compared to synthetic wastewater experiments.
The removal of organic micropollutants (OMPs) has been investigated in constructed wetlands (CWs) operated as bioelectrochemical systems (BES). The operation of CWs as BES (CW-BES), either in the form of microbial fuel cells (MFC) or microbial electrolysis cells (MEC), has only been investigated in recent years. The presented experiment used CW meso-scale systems applying a realistic horizontal flow regime and continuous feeding of real urban wastewater spiked with four OMPs (pharmaceuticals), namely carbamazepine (CBZ), diclofenac (DCF), ibuprofen (IBU) and naproxen (NPX). The study evaluated the removal efficiency of conventional CW systems (CW-control) as well as CW systems operated as closed-circuit MFCs (CW-MFCs) and MECs (CW-MECs). Although a few positive trends were identified for the CW-BES compared to the CW-control (higher average CBZ, DCF and NPX removal by 10-17% in CW-MEC and 5% in CW-MFC), these proved to be not statistically significantly different. Mesoscale experiments with real wastewater could thus not confirm earlier positive effects of CW-BES found under strictly controlled laboratory conditions with synthetic wastewaters. (C) 2021 Elsevier Ltd. All rights reserved.
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