Research on Volatile Fatty Acids Production During the Anaerobic Digestion of Corn Stover Waste in Northeast China: Freeze-Thaw Pretreatment and Effect of Initial pH

IF 3 3区工程技术 Q3 ENERGY & FUELS

BioEnergy Research Pub Date : 2025-07-14 DOI:10.1007/s12155-025-10866-4

Nan Qi, Yinuo Zhao, Chaoxing Zhang, Ying Xu, Zixi Wei, Hongxu Bao, Jian Wang

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Abstract

The low temperatures in Northeastern China offer a promising and energy-efficient approach for lignocellulose pretreatment. The effects of freeze-thaw pretreatment on the microstructure of corn stover hydrolysis characteristics and fermentation acid production were investigated using corn stover as the raw material. The experimental results demonstrated that the reducing sugar release and soluble chemical oxygen demand (SCOD) values of corn stover following freeze-thaw pretreatment exhibited increases of 15.8% to 67.0% and 13.9% to 68.9%, respectively, compared to those of the control group. Freeze-thaw pretreatment modifies the microstructure of corn stover by breaking hydrogen bonds in the amorphous region between cellulose and hemicellulose, facilitating lignin removal. The acid yield of the treated corn stover under optimal pretreatment conditions is enhanced by up to 77.9% compared with the control group. The initial pH pronouncedly influenced the acid yield of anaerobic fermentation of corn stover, with the highest acid yield of 3.8 g/L observed at pH values between 7.5 and 8. This study provides theoretical guidance for the industrial development of a low-cost and low-energy consumption pretreatment method in lignocellulose wastes.

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东北地区玉米秸秆废弃物厌氧消化过程中挥发性脂肪酸生成的研究：冻融预处理及初始pH的影响

中国东北地区的低温为木质纤维素预处理提供了一条有前途的节能途径。以玉米秸秆为原料，研究了冻融预处理对玉米秸秆微观结构、水解特性和发酵产酸的影响。结果表明，冻融处理后玉米秸秆的还原糖释放量和可溶性化学需氧量（SCOD）值分别比对照组提高了15.8% ~ 67.0%和13.9% ~ 68.9%。冻融预处理通过破坏纤维素和半纤维素之间无定形区域的氢键来改变玉米秸秆的微观结构，促进木质素的去除。在最佳预处理条件下，玉米秸秆的产酸率比对照组提高了77.9%。初始pH值明显影响玉米秸秆厌氧发酵产酸量，pH值在7.5 ~ 8之间时产酸量最高，为3.8 g/L。本研究为木质纤维素废弃物低成本、低能耗预处理方法的产业化发展提供了理论指导。

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来源期刊

BioEnergy Research ENERGY & FUELS-ENVIRONMENTAL SCIENCES

CiteScore

6.70

自引率

8.30%

发文量

174

审稿时长

3 months

期刊介绍： BioEnergy Research fills a void in the rapidly growing area of feedstock biology research related to biomass, biofuels, and bioenergy. The journal publishes a wide range of articles, including peer-reviewed scientific research, reviews, perspectives and commentary, industry news, and government policy updates. Its coverage brings together a uniquely broad combination of disciplines with a common focus on feedstock biology and science, related to biomass, biofeedstock, and bioenergy production.