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Water 2018, 10(7), 940; https://doi.org/10.3390/w10070940

Constructed Wetland-Microbial Fuel Cells for Sustainable Greywater Treatment

1
Department of Civil Engineering, Universidad de Chile, 8370449 Santiago, Chile
2
Centro de Desarrollo Urbano Sustentable (CEDEUS), 7520246 Santiago, Chile
3
Department of Hydraulic and Environmental Engineering, Pontificia Universidad Católica de Chile, 7820436 Santiago, Chile
*
Author to whom correspondence should be addressed.
Received: 6 June 2018 / Revised: 4 July 2018 / Accepted: 10 July 2018 / Published: 14 July 2018
(This article belongs to the Section Water and Wastewater Treatment)
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Abstract

Greywater reuse through decentralized and low-cost treatment systems emerges as an opportunity to tackle the existing demand for water. In recent years, constructed wetlands (CW) systems and microbial fuel cells (MFCs) have emerged as attractive technologies for sustainable wastewater treatment. In this study, constructed wetland microbial fuel cells (CW-MFCs) planted with Phragmites australis were tested to evaluate the potential of combining these two systems for synthetic greywater treatment and energy recovery. Open (CW) and closed circuit (CW-MFCs) reactors were operated for 152 days to evaluate the effect of energy recovery on the removal of soluble chemical oxygen demand (sCOD), nutrients and total suspended solids (TSS). Results indicate no significant differences for sCOD and phosphate removal efficiencies. CW-MFCs and CW reactors presented sCOD removal efficiency of 91.7 ± 5.1% and 90 ± 10% and phosphate removal efficiencies of 56.3 ± 4.4% and 61.5 ± 3.5%, respectively. Nitrate removal efficiencies were higher in CW: 99.5 ± 1% versus 86.5 ± 7.1% in CW-MFCs, respectively. Energy generation reached a maximum power density of 33.52 ± 7.87 mW m−3 and 719.57 ± 67.67 mW m−3 at a poised anode potential of −150 mV vs. Ag/AgCl. Thus, our results suggest that the incorporation of MFC systems into constructed wetlands does allow energy recovery while providing effective greywater treatment. View Full-Text
Keywords: microbial fuel cell; constructed wetland; greywater; wastewater treatment; water reuse microbial fuel cell; constructed wetland; greywater; wastewater treatment; water reuse
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Araneda, I.; Tapia, N.F.; Lizama Allende, K.; Vargas, I.T. Constructed Wetland-Microbial Fuel Cells for Sustainable Greywater Treatment. Water 2018, 10, 940.

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