Effective removal of zinc from industrial plating wastewater using hydrolyzed olive cake: Scale-up and preparation of zinc-Based biochar. (1st August 2019)

• Record Type: Journal Article
• Authors: Fernández-González, R.; Martín-Lara, M.A.; Moreno, J.A.; Blázquez, G.; Calero, M.
• Is Part Of: Journal of cleaner production. Volume 227(2019)
• Page Start: 634
• Page End: 644
• Publication Date: 2019-08-01
• Subjects: Biochar -- Biosorption -- Industrial wastewater -- Olive cake -- Scale-up; 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.2019.04.195
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: In this study, the removal of zinc from plating wastewaters using fixed bed columns packed with hydrolyzed olive cake was investigated. This work discusses the significance of the scale-up and provides a brief overview of the potential uses of exhausted biosorbent for the generation of zinc-based materials. First, biosorption studies were performed to analyze biosorption behavior of hydrolyzed olive cake in different sized columns. Influence of important design parameters such as contact time, linear velocity and bed height/diameter ratio on biosorption performance was studied. Results indicated a significant effect of contact time on scale-up. Higher bed depths increased the biosorption capacity due to a larger dose of absorbent in the packed columns. As the flow rate increased, the breakthrough time decreased and the exhaustion of the column was reached faster. In addition, operating at the same contact time and bed height/diameter ratio and at a linear velocity much higher in the pilot column, the zinc uptake capacity was found to be higher. Better biosorption results could be due to velocity influencing the mass transfer and hydraulics improving the fluid dispersion. Finally, exhausted biosorbent was subjected to different thermal treatments. Preliminary tests showed that zinc-loaded solid can be recycled for the generation of zinc-based materials. Graphical abstract: Image 1 Highlights: Olive cake can be used as biosorbent for zinc electroplating wastewater treatment. Effect of operational parameters involved in zinc removal was discussed. Residual solid can be recycled for the generation of zinc-based biochar. The entire process is easy to scale-up.