Combination Strategy of Bioenzymes and Sophorolipid Pretreatments Enhance Volatile Fatty Acid Production Based on Co-Fermentation of Waste Activated Sludge and Rubberwood Hydrolysates

文献类型： 外文期刊

第一作者： Yin, Fen

作者： Yin, Fen;Bie, Wenxuan;Ma, Xiaojun;Zheng, Yingying;Li, Dongna;Li, Jianing

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关键词： volatile fatty acids; anaerobic fermentation; bioenzymes; rubberwood hydrolysates; waste activated sludge

期刊名称：FERMENTATION-BASEL （ 影响因子：3.3； 五年影响因子：3.5 ）

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年卷期： 2025 年 11 卷 8 期

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收录情况： SCI

摘要： In this study, we developed a combination strategy of bioenzymes and sophorolipid (SL) co-pretreatment to enhance volatile fatty acids (VFAs) in co-fermentation of waste activated sludge (WAS) and rubberwood hydrolysates (RWHs). Among all the pretreatments, SL and laccase co-pretreatment markedly increased soluble bioavailable substrates (carbohydrates and proteins) by inducing EPS catabolism and WAS disintegration, and obtained the highest VFAs yield of 7049.43 mg/L. The proportion of VFA composition can be controlled by modifying the types and amounts of added bioenzymes. Under SL and laccase co-pretreatment conditions, RWHs were more efficiently converted into VFAs due to the higher activity of WAS, resulting in lower cellulose (3.41%) and lignin (0.66%) content in the fermentation broth. Compared with other pretreatments, SL and laccase co-pretreatment enhanced the enrichment of the functional microorganisms, including anaerobic fermentation bacteria (Firmicutes, Bacteroidota, and Proteobacteria) and reducing bacteria (Acinerobacter and Ahniella). Therefore, the combination pretreatments might be a promising solution for strengthening VFA accumulation in the WAS and RWH co-fermentation.

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