Abstract
Molasses is a byproduct of sugar and fermentation factories and a mixture of sucrose with other mono/poly saccharides and the conventional biological treatments are unable effectively to mineralize and decolorize them from the wastewater effluent. In this study, the efficacy of catalytic ozonation process (COP) with magnetic carbonaceous nanocomposite, as a novel catalyst, on dye degradation and mineralization of molasses were investigated and the results were compared with those obtained from single ozonation process (SOP) and granular activated carbon (GAC) catalyst. For this purpose, the nanocomposite synthesized with co-precipitation method and applied with ozonation in COP. Then the influential parameters such as pH, catalyst dosage and synergistic effect were all evaluated. The residual dye concentration, chemical oxygen demand (COD) and total organic carbon (TOC) were analyzed using american dye manufactures institute, acid digestion, and total organic carbon analyzing methods, respectively. The results showed that the degradation efficiency of dye, COD and TOC in COP was 95, 51 and 74%, respectively, and the highest efficiency of the nanocomposite was achieved at optimal pH of 8. However the results of dye removal in COP (95%) were higher than SOP (71%) and GAC/ozonation (86%). Furthermore, this catalyst has synergistic property on dye decomposition, so that the greatest synergistic effect on the dye removal efficiency is 15% which occurred in the first 15 min, and the catalytic role of magnetic carbon is not affected by dye adsorption. This finding revealed that the applied approach is technically suitable for the effective degradation and mineralization of dye contaminant form molasses industrial wastewaters.
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The authors appreciate the Golestan University of Medical Sciences (Project Reference Number: 267060) for providing financial and instrumental support to conduct this work.
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Rahimi, E., Shahamat, Y.D., Kamarehei, B. et al. Rapid decolorization and mineralization of molasses by catalytic ozonation process with a nanocomposite from fermentation industry wastewater. Int. J. Environ. Sci. Technol. 15, 1941–1948 (2018). https://doi.org/10.1007/s13762-017-1515-8
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DOI: https://doi.org/10.1007/s13762-017-1515-8