Biological anodic oxidation and cathodic reduction reactions for improved bioelectrochemical treatment of petroleum refinery wastewater. (20th July 2018)

• Record Type: Journal Article
• Authors: Mohanakrishna, Gunda; Abu-Reesh, Ibrahim M.; Al-Raoush, Riyadh I.
• Is Part Of: Journal of cleaner production. Volume 190(2018)
• Page Start: 44
• Page End: 52
• Publication Date: 2018-07-20
• Subjects: Hybrid bioelectrochemical system -- Petroleum refinery wastewater -- Graphite based BES -- Bioanode -- Biocathode -- Synergistic bioelectrochemical treatment; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.04.141
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Bioelectrochemical systems (BESs) were evaluated for the bioelectrochemical treatment (BET) of petroleum refinery wastewater (PRW) by applying mild electrochemical potential in the range of 400–1000 mV on a single chamber membrane-less BES configured with anodic and cathodic biofilms. After four days of cycle operation in batch mode, BES achieved a maximum current density of 278 mA/m 2 and a power density of 222 mW/m 2 using applied potential of 800 mV. This system also achieved COD degradation rate of 0.364 kg COD/m 3 -day. Diesel range organics (DROs) exhibited more than 90% degradation, which is 15 times higher than the abiotic control. Electrochemically active bioanode and biocathode contributed to the degradation of PRW through both oxidation and reduction reactions with mild applied potentials. This also resulted in a 30% improvement in COD removal compared to MFC with biocatalyst only on the anode. The function of improved bioelectrochemical treatment was also exhibited by redox current values of cyclic voltammograms. Highlights: Synergy of bioanode and biocathode improved petroleum refinery wastewater treatment. Diesel range organics were treated for more than 90% efficiency. Membrane-less graphite BET system offers efficient industrial wastewater treatment.