Effects of solid retention time and exposure mode to electric current on Remazol Brilliant Violet removal in an electro-membrane bioreactor.

Autor: Belli TJ; Civil Engineering Department, Santa Catarina State University, Ibirama, SC, ZIP 89140-000, Brazil. tiago.belli@udesc.br., Bassin JP; Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21941-972, Brazil., de Sousa Vidal CM; Environmental and Sanitary Engineering Department, State University of Centro-Oeste (UNICENTRO), PR 153, Km 07, Riozinho, P.O. Box 21, Irati, PR, Brazil., Hassemer MEN; Environmental Engineering Program, PPGEA, Federal University of Santa Catarina, P.O. Box 476, Florianópolis, SC, ZIP 88040-900, Brazil., Rodrigues C; Environmental Engineering Program, PPGEA, Federal University of Santa Catarina, P.O. Box 476, Florianópolis, SC, ZIP 88040-900, Brazil., Lapolli FR; Environmental Engineering Program, PPGEA, Federal University of Santa Catarina, P.O. Box 476, Florianópolis, SC, ZIP 88040-900, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2023 Apr; Vol. 30 (20), pp. 58412-58427. Date of Electronic Publication: 2023 Mar 29.
DOI: 10.1007/s11356-023-26593-2
Abstrakt: The performance of an electrochemically assisted anoxic-oxic membrane bioreactor (A/O-eMBR) was assessed as an alternative for azo dye (Remazol Brilhant Violet (RBV)) removal from simulated textile wastewater. The A/O-eMBR was operated under three experimental conditions (runs I, II, and III), in which different solids retention time (SRT) (45 and 20 d) and exposure mode to electric current (6'ON/30'OFF and 6'ON/12'OFF) were assessed. The reactor exhibited excellent decolorization performance for all runs, with average dye removal efficiency ranging from 94.3 to 98.2%. Activity batch assays showed that the dye removal rate (DRR) decreased from 16.8 to 10.2 mg RBV L -1  h -1 when the SRT was reduced from 45 to 20 d, likely attributed to the lower biomass content under lower sludge age. At the electric current exposure mode of 6' ON/12'OFF, a more substantial decrease of DRR to 1.5 mg RBV L -1  h -1 was noticed, suggesting a possible inhibitory effect on dye removal via biodegradation. By reducing the SRT to 20 d, a worse mixed liquor filterability condition was observed, with a membrane fouling rate (MFR) of 0.979 kPa d -1 . In contrast, using the electric current exposure mode of 6'ON/12'OFF resulted in lower membrane fouling propensity, with an MFR of 0.333 kPa d -1 . A more attractive cost-benefit ratio for dye removal was obtained using the exposure mode of 6'ON/30'OFF, for which the energy demand was estimated at 21.9-22.6 kWh kg dye -1 removed, almost two times lower than that observed for the mode of 6'ON/12'OFF.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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