Author:
Volodko Oleksii I.,Ivanova Tetiana S.,Kulichkova Ganna I.,Lukashevych Kostyantyn M.,Blume Yaroslav B.,Tsygankov Sergii P.
Abstract
Background:Production of bioethanol from sweet sorghum (Sorghum saccharatum) is a promising “green” energy source that can help to reduce energy dependence on petroleum products, to decrease greenhouse gas emissions, and fight environmental pollution. As an additional benefit, it can promote the exploitation of new uncultivated agricultural lands and favor establishing integrated agro-industrial energy independent enterprises. The alcoholic fermentation under reduced pressure may prevent the accumulation of high ethanol concentrations in the cultured broth and thus may create favorable conditions for the highest productivity of yeastSaccharomyces cerevisiae.Objective:Elaboration of optimal conditions for sweet sorghum syrup fermentation under reduced pressure.Aim:To determine the parameters of sweet sorghum syrup fermentation byS. cerevisiaeunder the conditions of constant and periodic reduced pressure for the highest bioethanol production efficiency.Methods:The sweet sorghum was grown in a temperate continental climate region of Northern Ukraine. The parameters of diluted stem syrup andS. cerevisiaefermentation under reduced and atmospheric pressure were established and controlled by chemical, biochemical and physicochemical methods. The yeast cells were dyed with methylene blue and counted using a microscope and a Neubauer counting chamber. The obtained data have been statistically analyzed.Results:It has been established that a periodic vacuum extraction with short-term heating of the medium to the boiling point is the most promising procedure for bioethanol production. Periodically reduced pressure fermentation of sweet sorghum diluted syrup resulted in 55% higher bioethanol productivity compared to atmospheric pressure fermentation. Such treatment enables to maintain the concentration of ethanol in the medium below 5.5% vol., which does not significantly inhibit the productivity of industrial yeast strains and allows adding a nutrient with the subsequent continuation of the cultivation process. The resulting distillate requires less energy for further dehydration.Conclusion:The sweet sorghum syrup does not contain substances that inhibit yeast cells although nitrogen and phosphorus supplements are required to support efficientS. cerevisiaegrowth. The optimal technology, elaborated in this research, consists of repeated cycles of fermentation under reduced pressure (to the level of vacuum) for boiling the cultured broth. This technology provides the highest bioethanol output, high efficiency, and productivity of the overall process.
Publisher
Bentham Science Publishers Ltd.
Subject
Soil Science,Agronomy and Crop Science,Animal Science and Zoology
Reference64 articles.
1. Kumar P, Kumar V, Kumar S, Singh J, Kumar P. Bioethanol production from sesame (Sesamum indicum L.) plant residue by combined physical, microbial and chemical pretreatments. Bioresour Technol 2020; 297 122484
2. Volodko OI, Novak AG, Tsygankov SP. Substantiating availability of using sweet sorghum for bio-ethanol production in Ukraine. Altern Energ Ecol 2013; 9 (131) : 24-34.
3. Obermaier M, Oberling DF, Szklo AS, Rovere EL. Investments of oil majors in biofuels: scope, integration and diversification. IAEE International Conference Stockholm. June 19-23, 2011.
4. Toor M, Kumar SS, Malyan SK, et al. An overview on bioethanol production from lignocellulosic feedstocks. Chemosphere 2020; 242 125080
5. Tan JSh, Phapugrangkul P, Lee ChK, Lai ZW, Abu Bakar MH, Murugan P. Banana frond juice as novel fermentation substrate for bioethanol production by Saccharomyces cerevisiae. Biocatal Agric Biotechnol 2019; 21 101293
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