School of Environmental Science and Technology, Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian University of Technology, Dalian 116024, China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
School of Bioengineering, Dalian University of Technology, Dalian 116024, China.
Sci Total Environ. 2021 Oct 10;790:148206. doi: 10.1016/j.scitotenv.2021.148206. Epub 2021 Jun 4.
Biochar has been shown to benefit fermentative hydrogen production. However, the influencing factors and key characteristics of its promoting function remained to be elucidated. This study investigated the effects of two crucial factors, feedstock and pyrolysis temperature, on the hydrogen production-promoting function of biochar in ethanol-type fermentation. The physicochemical characteristics and promoting effects of biochars prepared with five biomass wastes (coffee ground, corn stalk, Ginkgo biloba leaf, mealworm frass, and sugarcane bagasse) were determined. Sugarcane bagasse-derived biochar (SBBC) showed the best hydrogen production-promoting effect in ethanol-type fermentation. The physicochemical properties of biochar, such as pH, element composition and surface features, were significantly affected by pyrolysis temperature, but the promoting effects were not significantly changed. The hydrogen production-promoting effect of biochar in ethanol-type fermentation was mainly affected by feedstock instead of pyrolysis temperature. A potential promoting mechanism was proposed that biochar prepared at low temperature boosted the hydrogen production with redox activity, while that at high temperature achieved the promotion via cell growth enhancement. This study revealed the key promoting factor of biochar in ethanol-type fermentative hydrogen production, and provided novel insights for the promoting mechanism of biochar.
生物炭已被证明有利于发酵产氢。然而，其促进功能的影响因素和关键特性仍有待阐明。本研究考察了两个关键因素，即原料和热解温度，对生物炭在乙醇型发酵中产氢促进功能的影响。本研究测定了五种生物质废料（咖啡渣、玉米秸秆、银杏叶、虫粪和甘蔗渣）制备的生物炭的理化特性及其促进作用。甘蔗渣衍生生物炭（SBBC）在乙醇型发酵中表现出最好的产氢促进效果。生物炭的理化性质，如 pH 值、元素组成和表面特征，受热解温度的显著影响，但促进效果没有显著变化。生物炭在乙醇型发酵中产氢的促进作用主要受原料而不是热解温度的影响。提出了一种潜在的促进机制，即低温制备的生物炭通过氧化还原活性促进产氢，而高温制备的生物炭则通过增强细胞生长来促进产氢。本研究揭示了生物炭在乙醇型发酵中产氢的关键促进因素，为生物炭的促进机制提供了新的见解。
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