A biorefinery approach for the production of bioethanol from alkaline-pretreated, enzymatically hydrolyzed Nicotiana tab
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ORIGINAL ARTICLE
A biorefinery approach for the production of bioethanol from alkaline-pretreated, enzymatically hydrolyzed Nicotiana tabacum stalks as feedstock for the bio-based industry Karn Sophanodorn 1 & Yuwalee Unpaprom 2 & Kanda Whangchai 3 & Akksatcha Duangsuphasin 4 & Numchok Manmai 5 & Rameshprabu Ramaraj 1 Received: 22 October 2020 / Revised: 12 November 2020 / Accepted: 19 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, an attempt was made to investigate bioethanol production using low-cost feedstock, namely, tobacco wastes obtained after the leaves harvesting. Tobacco stalks, an abundant biomass source of the leftover agricultural crop field, are a promising feedstock for bioethanol production. Traditional Thai tobacco (Nicotiana tabacum L.) is known as non-Virginia type tobacco stalks and was used as biomass feedstock for ethanol production by separate hydrolysis and fermentation (SHF) with a computerized fermenter. Tobacco stalks were efficiently hydrolyzed after a mild physical-chemical pretreatment. The economically cheapest alkaline chemical (2% CaO) was used for pretreatment. The robust yeast Saccharomyces cerevisiae was utilized, and it is suitable for industrial ethanol production. These data suggest that tobacco stalks are potential candidates for ethanol production from physical alkali-pretreated biomass with enzymatic hydrolysis on the SHF system. Keywords Biorefinery approach . Tobacco stalks . Pretreatment . Hydrolyzed . Bioethanol . Bio-based industry
1 Introduction Thailand is a country with a diverse range of agricultural products. As a result of agricultural activities, many wastes are available as biomass [1, 2]. Conversing to the waste to wealth concept of the circular economy, agriculture products and waste from the agriculture industry can be processed as a biomaterial or other highly valuable substances in the biomass and biofuel industry. Biomass waste represents the excellent replacement of fossil fuels for energy recovery and * Rameshprabu Ramaraj [email protected]; [email protected] 1
School of Renewable Energy, Maejo University, Chiang Mai 50290, Thailand
2
Program in Biotechnology, Faculty of Science, Maejo University, 50290 Chiang Mai, Thailand
3
Center of Excellence in Bioresources for Agriculture, Industry and Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
4
Faculty of Engineering, Rajamangala University of Technology Lanna, Chiang Mai 50300, Thailand
5
Department of Forestry, National Chung Hsing University, Taichung 402, Taiwan
valorization into value-added products [3–5]. Among biochemical and thermochemical conversion techniques of biomass, bioenergy appears to be most appealing due to its low pollutant emission and diverse product formation [6, 7]. Therefore, agricultural waste is a resource for sustainable energy in local communities. Furthermore, air pollution from various sources, including agricultural wastes open burning, is a significant risk of public health problems. The Wo
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