Energy Research Laboratory, Renewable Energy Section (LRE/SENC), Institute for Geological and Mining Research (IRGM), Nlongkak Yaounde, Cameroon.
Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, Clermont-Ferrand, France.
Bioengineered. 2023 Dec;14(1):228-244. doi: 10.1080/21655979.2023.2234135.
Taken separately, a single sweet sorghum stem bioconversion process for bioethanol and biomethane production only leads to a partial conversion of organic matter. The direct fermentation of crushed whole stem coupled with the methanization of the subsequent solid residues in a two-stage process was experimented to improve energy bioconversion yield, efficiency, and profitability. The raw stalk calorific value was 17,144.17 kJ/kg DM. Fermentation step performed using resulted in a bioconversion yield of 261.18 g Eth/kg DM, . an energy recovery efficiency of 6921.27 kJ/kg DM. The methanogenic potentials were 279 and 256 LCH/kg DM, respectively, for raw stem and fermentation residues, . energy yields of 10,013.31 and 9187.84 kJ/kg DM, respectively. Coupling processes have significantly increased yield and made it possible to reach 13,309.57 kJ/kg DM, . 77.63% of raw stem energy recovery yield, compared to 40.37% and 58.40%, respectively, for single fermentation and methanization processes.
单独来看，甜高粱秸秆生物转化为生物乙醇和生物甲烷的单一过程仅导致有机物的部分转化。通过两段式工艺，将粉碎后的整秸秆直接发酵，并对后续的固体残渣进行甲烷化，可提高能量生物转化的产率、效率和盈利能力。原料秸秆的热值为 17144.17 kJ/kg DM。采用 进行发酵步骤，可得到 261.18 g Eth/kg DM 的生物转化产率，. 6921.27 kJ/kg DM 的能量回收效率。对于原料秸秆和发酵残渣，甲烷化潜力分别为 279 和 256 LCH/kg DM，. 能量产率分别为 10013.31 和 9187.84 kJ/kg DM。耦合工艺显著提高了产率，使 13309.57 kJ/kg DM 的能量回收率达到 13309.57 kJ/kg DM，. 比单一发酵和甲烷化工艺分别提高了 77.63%和 58.40%。
