Hybrid constructed wetlands integrated with microbial fuel cells and reactive bed filter for wastewater treatment and bioelectricity generation.

Autor: Colares GS; Postgraduate Program in Environmental Technology, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil. gustavoscolares@gmail.com., Dell'Osbel N; Postgraduate Program in Environmental Technology, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil., Paranhos G; Chemical Engineering Program, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil., Cerentini P; Chemical Engineering Program, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil., Oliveira GA; Postgraduate Program in Water Resources and Environmental Sanitation, Federal University of Rio Grande do Sul, Av, Bento Gonçalves, Porto Alegre, RS, 91501-970, Brazil., Silveira E; Postgraduate Program in Water Resources and Environmental Sanitation, Federal University of Rio Grande do Sul, Av, Bento Gonçalves, Porto Alegre, RS, 91501-970, Brazil., Rodrigues LR; Postgraduate Program in Water Resources and Environmental Sanitation, Federal University of Rio Grande do Sul, Av, Bento Gonçalves, Porto Alegre, RS, 91501-970, Brazil., Soares J; Postgraduate Program in Environmental Technology, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil., Lutterbeck CA; Postgraduate Program in Environmental Technology, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil., Rodriguez AL; Postgraduate Program in Environmental Technology, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil., Vymazal J; Faculty of Environmental Science, Czech University of Life Sciences Prague, Prague, Czech Republic., Machado ÊL; Postgraduate Program in Environmental Technology, University of Santa Cruz do Sul (UNISC), Avenida Independência, 2293, Santa Cruz do Sul, Rio Grande do Sul, 96815-900, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2022 Mar; Vol. 29 (15), pp. 22223-22236. Date of Electronic Publication: 2021 Nov 15.
DOI: 10.1007/s11356-021-17395-5
Abstrakt: The present study aimed to develop a pilot-scale integrated system composed of anaerobic biofilter (AF), a floating treatment wetland (FTW) unit, and a vertical flow constructed wetland coupled with a microbial fuel cell (CW-MFC) and a reactive bed filter (RBF) for simultaneously decentralized urban wastewater treatment and bioelectricity generation. The first treatment stage (AF) had 1450 L and two compartments: a settler and a second one filled with plastic conduits. The two CWs (1000 L each) were vegetated with mixed plant species, the first supported in a buoyant expanded polyethylene foam and the second (CW-MFC) filled with pebbles and gravel, whereas the RBF unit was filled with P adsorbent material (light expanded clay aggregate, or LECA) and sand. In the CW-MFC units, 4 pairs of electrode chambers were placed in different spacing. First, both cathode and anode electrodes were composed of graphite sticks and monitored as open circuit. Later, the cathode electrodes were replaced by granular activated carbon (GAC) and monitored as open and closed circuits. The combined system efficiently reduced COD (> 64.65%), BOD 5 (81.95%), N-NH 3 (93.17%), TP (86.93%), turbidity (94.3%), and total coliforms (removal of three log units). Concerning bioenergy, highest voltage values were obtained with GAC electrodes, reaching up to 557 mV (open circuit) and considerably lower voltage outputs with closed circuit (23.1 mV). Maximum power densities were obtained with 20 cm (0.325 mW/m 2 ) and 30 cm (0.251 mW/m 2 ). Besides the electrode superficial areas, the HRT and the water level may have influenced the voltage values, impacting DO and COD concentrations in the wastewater.
(© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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