Acidogenic Fermentation of Kitchen Waste for the Production of Volatile Fatty Acids: Bioaugmentation by Bacillus GIEC

Fei Wang, Zhi Wang, Tao Xing, Yuan Huang, Ying Guo, Zhili Xie, Yongming Sun, Xiaoying Kong, Zhang Yi
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Abstract

In this study, the lignocellulosic (banana peel, tea residue, and paper towel in a ratio of 1:1:1) and protein (chicken breast) components of kitchen waste (KW) were used as substrates for mesophilic anaerobic fermentation to produce volatile fatty acids (VFAs). The ability of a new strain belonging to Bacillus sp. to improve the degradation of kitchen waste and VFAs production was investigated. The results showed that the addition of Bacillus cell wall depolymerization GIEC (Bacillus GIEC) to the fermentation system could result in higher concentrations of soluble chemical oxygen demand (sCOD), improved the removal rates of volatile solids (VS), and increased yield of VFAs from the substrates. Compared with the control group, the sCOD concentrations of lignocellulosic and protein substrates increased by 132.58% and 18.36%, respectively; the volatile solids removal rates of lignocellulosic and protein substrates increased by 84.96% and 135.53%, respectively; the yield of VFAs of lignocellulosic and protein substrates increased by 61.29% and 35.92%, respectively, reaching 0.31 g/g VSadded and 0.67 g/g VSadded, separately. According to the study, the addition of Bacillus GIEC enhanced the solubilization of solid organic matter during hydrolysis process, further resulting in a higher yield of VFAs compared to the control group. Furthermore, the micro-aerobic test showed that the bioaugmentation ability of Bacillus GIEC has little effect by the presence of oxygen. The Bacillus GIEC has the potential for bioaugmentation of the VFAs production from kitchen waste.
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厨余发酵产挥发性脂肪酸:GIEC 杆菌的生物增效作用
本研究以餐厨垃圾(KW)中的木质纤维素(香蕉皮、茶渣和纸巾按1:1:1的比例)和蛋白质(鸡胸肉)成分为底物,进行中温厌氧发酵,生产挥发性脂肪酸(VFAs)。研究了一株芽孢杆菌属的新菌株对厨余垃圾的降解能力和VFAs的产生。结果表明,在发酵体系中添加胞壁解聚芽孢杆菌GIEC (Bacillus GIEC)可提高可溶性化学需氧量(sCOD)浓度,提高挥发性固体(VS)的去除率,提高底物中VFAs的产量。与对照组相比,木质纤维素和蛋白质基质的sCOD浓度分别提高了132.58%和18.36%;木质纤维素和蛋白质底物的挥发性固体去除率分别提高了84.96%和135.53%;木质纤维素和蛋白质底物的VFAs产量分别提高了61.29%和35.92%,分别达到0.31 g/g VSadded和0.67 g/g VSadded。研究表明,在水解过程中,添加Bacillus GIEC增强了固体有机物的增溶作用,从而使VFAs的产率高于对照组。此外,微氧试验表明,氧存在对芽孢杆菌GIEC的生物增强能力影响不大。GIEC芽孢杆菌具有从厨房垃圾中生物增强VFAs生产的潜力。
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来源期刊
Journal of Biobased Materials and Bioenergy
Journal of Biobased Materials and Bioenergy 工程技术-材料科学:生物材料
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60
审稿时长
6 months
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