Tertiary treatability of molasses secondary effluents for color and organics: performance and limits of ozonation and adsorption

Fall, Cheikh; Olguin-Gutierrez, M. T.; Bâ, Khalidou M.; Esparza-Soto, Mario; Lucero-Chávez, M.

doi:10.1007/s13762-020-02711-2

Cited by 7 publications

(1 citation statement)

References 44 publications

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“…However, the low transfer of ozone mass from the gas phase to the liquid phase and the resistance of some organic compounds to be degraded directly by ozone generally limit the efficiency of conventional ozonation technologies (Janknecht et al 2001;Nawrocki 2013;Dias et al 2020). By testing the limits of ozonation as tertiary treatment for secondary effluents of molasses fermentation industries, Fall et al (2020) visualized a maximum reduction of 95% in color, but only 35% in chemical oxygen demand (COD). The introduction of catalysts can significantly increase the efficiency of the ozonation process due to increased generation of reactive oxygen species (ROS), such as hydroxyl radicals ( ⋅OH ), superoxide radicals (•O −…”

Section: Introductionmentioning

confidence: 99%

Study of the catalytic activity of multilayer graphene (MLG), molybdenum oxide (MoO2), and manganese ferrite (MnFe2O4) on the melanoidin removal by ozonation process

Mateus

Luz

Gelamo

et al. 2021

Braz. J. Chem. Eng.

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Melanoidin is a compound produced by food industries and distilleries, which has negative impacts on the water environment due to the high content of dissolved organic carbon and dark color. Consequently, this work aims to study the catalytic properties of multilayer graphene (MLG), molybdenum oxide (MoO 2 ), and manganese ferrite (MnFe 2 O 4 ) in the ozonation process to remove melanoidin from water solution. The results show that the reaction rate constant (k) of the melanoidin decolorization process using catalytic ozonation is 1.7 times higher than the non-catalytic ozonation process. The same results were observed for all catalytic materials with no significant difference among them. On the other hand, MLG was the most efficient catalyst in removing total organic carbon. The removal efficiency was 32% for the non-catalytic ozonation process and 63% for the catalytic ozonation using MLG. This increase in efficiency is attributed to a better production of hydroxyl radicals in the presence of MLG, which was confirmed using isopropanol as a radical scavenger. The efficiencies using MoO 2 and MnFe 2 O 4 were 46% and 51%, respectively. The results show that catalytic ozonation by MLG is a promising treatment for melanoidin removal.

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