数字农科院2.0

Enzyme enhanced lactic acid fermentation of swine manure and apple waste: Insights from organic matter transformation and functional bacteria

文献类型： 外文期刊

作者： Tianjing Lian;Wanqin Zhang;Qitao Cao;Fubin Yin;Shunli Wang;Tanlong Zhou;Xiaoman Wei;Fangyu Zhang;Zengqiang Zhang;Hongmin Dong

作者机构：

关键词： Anaerobic co-fermentation;Apple waste;Enzymatic pretreatment;Lactic acid;Swine manure

期刊名称： Journal of Environmental Management

ISSN： 0301-4797

年卷期： 2024 年 356 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Anaerobic co-fermentation is a favorable way to convert agricultural waste, such as swine manure (SM) and apple waste (AW), into lactic acid (LA) through microbial action. However, the limited hydrolysis of organic matter remains a main challenge in the anaerobic co-fermentation process. Therefore, this work aims to deeply understand the impact of cellulase (C) and protease (P) ratios on LA production during the anaerobic co-fermentation of SM with AW. Results showed that the combined use of cellulase and protease significantly improved the hydrolysis during the enzymatic pretreatment, thus enhancing the LA production in anaerobic acidification. The highest LA reached 41.02 ± 2.09 g/L within 12 days at the ratio of C/P = 1:3, which was approximately 1.26-fold of that in the control. After a C/P = 1:3 pretreatment, a significant SCOD release of 45.34 ± 2.87 g/L was achieved, which was 1.13 times the amount in the control. Moreover, improved LA production was also attributed to the release of large amounts of soluble carbohydrates and proteins with enzymatic pretreated SM and AW. The bacterial community analysis revealed that the hydrolytic bacteria Romboutsia and Clostridium_sensu_stricto_1 were enriched after enzyme pretreatment, and Lactobacillus was the dominant bacteria for LA production. This study provides an eco-friendly technology to enhance hydrolysis by enzymatic pretreatment and improve LA production during anaerobic fermentation.

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