title: Pretreatment of corn stover with diluted acetic acid for enhancement of acidogenic fermentation.
abstract: A Box-Behnken design of response surface method was used to optimize acetic acid-catalyzed hydrothermal pretreatment of corn stover, in respect to acid concentration (0.05-0.25%), treatment time (5-15 min) and reaction temperature (180-210°C). Acidogenic fermentations with different initial pH and hydrolyzates were also measured to evaluate the optimal pretreatment conditions for maximizing acid production. The results showed that pretreatment with 0.25% acetic acid at 191°C for 7.74 min was found to be the most optimal condition for pretreatment of corn stover under which the production of acids can reach the highest level. Acidogenic fermentation with the hydrolyzate of pretreatment at the optimal condition at the initial pH=5 was shown to be butyric acid type fermentation, producing 21.84 g acetic acid, 7.246 g propionic acid, 9.170 butyric acid and 1.035 g isovaleric acid from 100g of corn stover in 900 g of water containing 2.25 g acetic acid.
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Aerospace Environmental Engineering Co., Ltd., Beijing 100074, China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Xuebin
authors.initials: X
authors.lastname: Lu
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China. Electronic address: zhangst@tju.edu.cn.
authors.forename: Shuting
authors.initials: S
authors.lastname: Zhang
mesh_terms: D019342:Acetic Acid / Q000737:chemistry*; D000693:Anaerobiosis; D005285:Fermentation; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D003313:Zea mays / Q000737:chemistry*
chemical_list: D019342:Acetic Acid
keywords: Acetic acid; Acidogenic fermentation; Corn stover; Pretreatment