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In this work, a novel surfactant assisted transition metal pretreatment strategy was evaluated for the production of bioethanol from chili post harvest residue. Among the various transition metals screened surfactant assisted ferrous sulphate pretreatment was found to be more effective in terms of reducing sugar yield.Various process parameters affecting pretreatment were optimized by adopting a Taguchi design.The optimum conditions of pretreatment were (% w/w) surfactant concentration of 1, FeSO 4 concentration of 2, biomass loading of 5 and pretreatment time of 20 min. Under optimized conditions 0.245g/g of reducing sugar per g of dry biomass (g/g) was obtained. The hydrolyzate is devoid of major fermentation inhibitors such as furfural, 5-hydroxymethylfurfural and organic acids such as citric acid, propionic acid and succinic acid. Fermentation of the non-detoxified hydrolyzate yielded 1.84%v/v of ethanol with a fermentation efficiency of 79%.

journal of energy and environmental sustainability

A Novel Surfactant-assisted Transition Metal Pretreatment of Chili Post Harvest Residue for the Production of Bioethanol by Separate Hydrolysis and Fermentatio