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Improvement of dry simultaneous saccharification and fermentation of rice straw to high concentration ethanol by sodium carbonate pretreatment

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  • Molaverdi, Maryam
  • Karimi, Keikhosro
  • Mirmohamadsadeghi, Safoora

Abstract

Ethanol at high concentration was produced from rice straw pretreated with sodium carbonate through dry simultaneous saccharification and fermentation (DSSF). A high concentration of ethanol was obtained without mechanical mixing, an increase in fermentation time, and pre-hydrolysis. The most important influencing factors, including pretreatment time (3–10 h), enzyme loading (5–40 FPU/g substrate), solid loading (15–30 wt %), and DSSF reaction time (48–120 h), were investigated on dry hydrolysis and DSSF. An increase in pretreatment time from 3 to 10 h improved ethanol concentration from 55.1 to 67.7 g/L, obtained through DSSF at 20% solid loading and 10 FPU/g substrate. A glucose concentration as high as 124.6 g/L was obtained from the hydrolysis of the straw treated for 5 h. The highest total sugar and ethanol concentration were 137.3 g/L and 83.1 g/L for the treated straw, while they were 65.2 g/L and 38.6 g/L for the untreated ones, respectively, obtained by hydrolysis and DSSF at 30% solid loading. Changes associated with pretreatment, i.e., composition, crystallinity, and microscopic structure of untreated and treated straws, were investigated to find the reason for the improved hydrolysis and DSSF.

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  • Molaverdi, Maryam & Karimi, Keikhosro & Mirmohamadsadeghi, Safoora, 2019. "Improvement of dry simultaneous saccharification and fermentation of rice straw to high concentration ethanol by sodium carbonate pretreatment," Energy, Elsevier, vol. 167(C), pages 654-660.
  • Handle: RePEc:eee:energy:v:167:y:2019:i:c:p:654-660
    DOI: 10.1016/j.energy.2018.11.017
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    References listed on IDEAS

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    1. Liu, Yunyun & Xu, Jingliang & Zhang, Yu & Yuan, Zhenhong & He, Minchao & Liang, Cuiyi & Zhuang, Xinshu & Xie, Jun, 2015. "Sequential bioethanol and biogas production from sugarcane bagasse based on high solids fed-batch SSF," Energy, Elsevier, vol. 90(P1), pages 1199-1205.
    2. Wen, Pei-Ling & Lin, Jin-Xu & Lin, Shih-Mo & Feng, Chun-Chiang & Ko, Fu-Kuang, 2015. "Optimal production of cellulosic ethanol from Taiwan's agricultural waste," Energy, Elsevier, vol. 89(C), pages 294-304.
    3. Khajeeram, Sutamat & Unrean, Pornkamol, 2017. "Techno-economic assessment of high-solid simultaneous saccharification and fermentation and economic impacts of yeast consortium and on-site enzyme production technologies," Energy, Elsevier, vol. 122(C), pages 194-203.
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    Cited by:

    1. Li, Wen-Chao & Zhang, Sen-Jia & Xu, Tao & Sun, Mei-Qing & Zhu, Jia-Qing & Zhong, Cheng & Li, Bing-Zhi & Yuan, Ying-Jin, 2020. "Fractionation of corn stover by two-step pretreatment for production of ethanol, furfural, and lignin," Energy, Elsevier, vol. 195(C).
    2. Hashemi, Seyed Sajad & Mirmohamadsadeghi, Safoora & Karimi, Keikhosro, 2020. "Biorefinery development based on whole safflower plant," Renewable Energy, Elsevier, vol. 152(C), pages 399-408.
    3. Lu, Jie & Song, Fuyu & Liu, Hao & Chang, Chengcheng & Cheng, Yi & Wang, Haisong, 2021. "Production of high concentration bioethanol from reed by combined liquid hot water and sodium carbonate-oxygen pretreatment," Energy, Elsevier, vol. 217(C).
    4. Jin, Xianchun & Ma, Jiangshan & Song, Jianing & Liu, Gao-Qiang, 2021. "Promoted bioethanol production through fed-batch semisimultaneous saccharification and fermentation at a high biomass load of sodium carbonate-pretreated rice straw," Energy, Elsevier, vol. 226(C).
    5. Jin, Xianchun & Ma, Jiangshan & Song, Jianing & Liu, Gao-Qiang, 2020. "Saccharification and detoxification of Na2CO3 pretreated rice straw with on-site manufactured enzymes secreted by Aspergillus fumigatus to enhance bioethanol yield," Renewable Energy, Elsevier, vol. 166(C), pages 117-124.
    6. Rezania, Shahabaldin & Oryani, Bahareh & Cho, Jinwoo & Talaiekhozani, Amirreza & Sabbagh, Farzaneh & Hashemi, Beshare & Rupani, Parveen Fatemeh & Mohammadi, Ali Akbar, 2020. "Different pretreatment technologies of lignocellulosic biomass for bioethanol production: An overview," Energy, Elsevier, vol. 199(C).
    7. Anu, & Kumar, Anil & Jain, Kavish Kumar & Singh, Bijender, 2020. "Process optimization for chemical pretreatment of rice straw for bioethanol production," Renewable Energy, Elsevier, vol. 156(C), pages 1233-1243.
    8. Jin, Xianchun & Song, Jianing & Liu, Gao-Qiang, 2020. "Bioethanol production from rice straw through an enzymatic route mediated by enzymes developed in-house from Aspergillus fumigatus," Energy, Elsevier, vol. 190(C).

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