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Fermentation
Volume 10
Issue 8
10.3390/fermentation10080436
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Article

Efficient Bioethanol Production from Spent Coffee Grounds Using Liquid Hot Water Pretreatment without Detoxification

by
Jiale Huang
1,
Biying Li
1,
Xiaoling Xian
1,
Yinan Hu
1 and
Xiaoqing Lin
1,2,*
1
School of Chemical Engineering and Light Industry, Guangdong University of Technology, No. 100 Waihuan Xi Road, Panyu District, Guangzhou 510006, China
2
Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou 510006, China
*
Author to whom correspondence should be addressed.
Fermentation 2024, 10(8), 436; https://doi.org/10.3390/fermentation10080436
Submission received: 25 June 2024 / Revised: 14 August 2024 / Accepted: 19 August 2024 / Published: 21 August 2024
(This article belongs to the Special Issue Fermentation: 10th Anniversary)
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Abstract

Coffee beans, a popular commodity in the world, are processed into coffee, which generates a considerable quantity of spent coffee grounds (SCGs). However, SCGs, a byproduct rich in hemicellulose, poses a challenge due to fermentable sugar loss during conventional pretreatment. This study investigates the efficient production of bioethanol from SCG using an optimized liquid hot water (LHW) pretreatment combined with separate hydrolysis and fermentation (SHF) process. LHW pretreatment at 180 °C for 20 min with a high solid-to-liquid ratio (SLR) of 1:6 (w/v) was optimized to disrupt the lignocellulosic structure and retain high levels of fermentable sugars, which included mannose and glucose. This approach achieved a bioethanol concentration of 15.02 ± 0.05 g/L and a productivity rate of 1.252 g/(L·h), demonstrating the efficiency of this integrated process. Interestingly, the high SLR LHW pretreatment significantly reduces water usage and enhances product concentration, offering a promising, environmentally friendly, and economically viable method for industrial bioethanol production from SCGs without the necessity of detoxification.
Keywords: spent coffee grounds; liquid hot water; separate hydrolysis and fermentation; bioethanol; high solid-to-liquid ratio spent coffee grounds; liquid hot water; separate hydrolysis and fermentation; bioethanol; high solid-to-liquid ratio

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MDPI and ACS Style

Huang, J.; Li, B.; Xian, X.; Hu, Y.; Lin, X. Efficient Bioethanol Production from Spent Coffee Grounds Using Liquid Hot Water Pretreatment without Detoxification. Fermentation 2024, 10, 436. https://doi.org/10.3390/fermentation10080436

AMA Style

Huang J, Li B, Xian X, Hu Y, Lin X. Efficient Bioethanol Production from Spent Coffee Grounds Using Liquid Hot Water Pretreatment without Detoxification. Fermentation. 2024; 10(8):436. https://doi.org/10.3390/fermentation10080436

Chicago/Turabian Style

Huang, Jiale, Biying Li, Xiaoling Xian, Yinan Hu, and Xiaoqing Lin. 2024. "Efficient Bioethanol Production from Spent Coffee Grounds Using Liquid Hot Water Pretreatment without Detoxification" Fermentation 10, no. 8: 436. https://doi.org/10.3390/fermentation10080436

APA Style

Huang, J., Li, B., Xian, X., Hu, Y., & Lin, X. (2024). Efficient Bioethanol Production from Spent Coffee Grounds Using Liquid Hot Water Pretreatment without Detoxification. Fermentation, 10(8), 436. https://doi.org/10.3390/fermentation10080436

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