Li Zhipeng, Chen Zhen, Ye Hong, Wang Yuanpeng, Luo Weiang, Chang Jo-Shu, Li Qingbiao, He Ning
Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, P.R. China; Fujian Provincial Key Laboratory of Fire Retardant Materials, College of Materials, Xiamen University, Xiamen, P.R. China; The Key Lab for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P.R. China.
Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, P.R. China; The Key Lab for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P.R. China.
Waste Manag. 2018 Aug;78:789-799. doi: 10.1016/j.wasman.2018.06.046. Epub 2018 Jul 2.
In this study, the anaerobic co-digestion of food waste (FW) and sewage sludge (SS) was investigated for the production of hydrogen and volatile fatty acids (VFAs). The results showed that the anaerobic co-digestion of these materials enhanced the hydrogen content by 62.4% (v/v), 29.89% higher than that obtained by FW digestion alone, and the total VFA production reached at 281.84 mg/g volatile solid (VS), a 8.38% increase. This enhancement was primarily resulted from improvements in the multi-substrate characteristics, which were obtained by supplying a higher soluble chemical oxygen demand (23.78-32.14 g/L) and suitable a pH (6.12-6.51), decreasing total ammonia nitrogen by 18.67% and ensuring a proper carbon/nitrogen ratio (15.01-23.01). Furthermore, maximal hydrogen (62.39 mL/g VS) and total VFA production potential (294.63 mg/g VS) were estimated using response surface methodology optimization, which yielded FW percentages of 85.17% and 79.87%, respectively. Based on a pyrosequencing analysis, the dominant bacteria associated with VFA and hydrogen production were promoted under optimized condition, including members of genera Veillonella and Clostridium and the orders Bacteroidales and Lactobacillales.
在本研究中，对食物垃圾（FW）和污水污泥（SS）的厌氧共消化进行了研究，以生产氢气和挥发性脂肪酸（VFA）。结果表明，这些物料的厌氧共消化使氢气含量提高了62.4%（v/v），比单独进行食物垃圾消化时获得的氢气含量高出29.89%，挥发性脂肪酸的总产量达到281.84毫克/克挥发性固体（VS），增加了8.38%。这种提高主要是由于多底物特性的改善，这是通过提供更高的可溶性化学需氧量（23.78 - 32.14克/升）和合适的pH值（6.12 - 6.51）、使总氨氮降低18.67%以及确保适当的碳/氮比（15.01 - 23.01）实现的。此外，使用响应面法优化估计出最大氢气产量（62.39毫升/克VS）和挥发性脂肪酸总产量潜力（294.63毫克/克VS），此时食物垃圾的比例分别为85.17%和79.87%。基于焦磷酸测序分析，在优化条件下，与挥发性脂肪酸和氢气产生相关的优势细菌得到了促进，包括韦荣氏菌属和梭菌属的成员以及拟杆菌目和乳杆菌目的成员。
