title: Methane production from rice straw pretreated by a mixture of acetic-propionic acid.
abstract: Rice straw was treated with a mixed solution of acetic acid and propionic acid to enhance its biodegradability. The effect of acid concentration, pretreatment time, and the ratio of solid to liquid on the delignification performance of rice straw were investigated. It was found that the optimal conditions for hydrolysis were 0.75 mol/L acid concentration, 2h pretreatment time and 1:20 solid to liquid ratio. Batch methane fermentation of untreated rice straw, pretreated rice straw, and the hydrolysates (the liquid fraction) of pretreatment were conducted at 35 degrees C for 30 days, and the results indicated that methane production of rice straw can be enhanced by dilute organic acid pretreatment. Moreover, most of the acid in hydrolysates can also be converted into methane gas.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-8577 Ibaraki, Japan. shiorizhao@gmail.com
authors.forename: Rui
authors.initials: R
authors.lastname: Zhao
authors.forename: Zhenya
authors.initials: Z
authors.lastname: Zhang
authors.forename: Ruiqin
authors.initials: R
authors.lastname: Zhang
authors.forename: Miao
authors.initials: M
authors.lastname: Li
authors.forename: Zhongfang
authors.initials: Z
authors.lastname: Lei
authors.forename: Motoo
authors.initials: M
authors.lastname: Utsumi
authors.forename: Norio
authors.initials: N
authors.lastname: Sugiura
mesh_terms: D019342:Acetic Acid / Q000737:chemistry*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002482:Cellulose / Q000737:chemistry; D005285:Fermentation; D005740:Gases; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D008697:Methane / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D012275:Oryza / Q000196:embryology*; D011422:Propionates / Q000737:chemistry*; D012722:Sewage; D013696:Temperature; D013997:Time Factors
chemical_list: D005740:Gases; D011422:Propionates; D012722:Sewage; D002482:Cellulose; D008031:Lignin; C029658:propionic acid; D008697:Methane; D019342:Acetic Acid