title: Comparative assessment of the methanogenic steps of single and two-stage processes without or with a previous hydrolysis of cassava distillage.
abstract: In this study, cassava distillage with a high solid content was digested in an anaerobic sequencing batch reactor (ASBR) without or with a previous hydrolytic step by a cellulolytic microbial consortium (i.e., single or two-stage process). The methanogenic steps of these processes were compared and evaluated through observation of the methanogenic stability and methane yield under different organic loading rates (OLRs). It was found the methanogenic reactor can be stably performed with the OLRs lower than 20 g COD L(-1) d(-1) in the two-stage process, where a specific methane yield (0.147 L CH4 g(-1) CODremoved) could be achieved, which was 17.6% higher than that of the single-stage process (0.125 L CH4 g(-1) CODremoved). The above results indicated that the degradation of cassava distillage in a two-stage process with a previous hydrolytic step can assure the methanogenic process proceeds with greater stability and generates higher methane yield.
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, PR China. Electronic address: zqh_net@163.com.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, PR China. Electronic address: xdzhu815@yahoo.com.cn.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Zhu
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, PR China.
authors.forename: Lingbao
authors.initials: L
authors.lastname: Kong
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, PR China.
authors.forename: Ganjun
authors.initials: G
authors.lastname: Yuan
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, PR China.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Zhai
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, PR China.
authors.forename: Haoju
authors.initials: H
authors.lastname: Liu
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, PR China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Guo
mesh_terms: D000693:Anaerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D002365:Manihot / Q000378:metabolism*; D008697:Methane / Q000378:metabolism*
chemical_list: D008697:Methane
keywords: Cassava distillage; Hydrolytic step; Microbial consortium; Organic loading rate (OLR); Two-stage process