title: Optimization of thermal-dilute sulfuric acid pretreatment for enhancement of methane production from cassava residues.
abstract: In this study, the pretreatment of cassava residues by thermal-dilute sulfuric acid (TDSA) hydrolysis was investigated by means of a statistically designed set of experiments. A three-factor central composite design (CCD) was employed to identify the optimum pretreatment condition of cassava residues for methane production. The individual and interactive effects of temperature, H(2)SO(4) concentration and reaction time on increase of methane yield (IMY) were evaluated by applying response surface methodology (RSM). After optimization, the resulting optimum pretreatment condition was 157.84°C, utilizing 2.99% (w/w TS) H(2)SO(4) for 20.15 min, where the maximum methane yield (248 mL/g VS) was 56.96% higher than the control (158 mL/g VS), which was very close to the predict value 56.53%. These results indicate the model obtained through RSM analysis is suit to predict the optimum pretreatment condition and there is great potential of using TDSA pretreatment of cassava residues to enhance methane yield.
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, PR China.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Tang
authors.forename: Jianhua
authors.initials: J
authors.lastname: Zhang
authors.forename: Zhonggui
authors.initials: Z
authors.lastname: Mao
authors.forename: Li
authors.initials: L
authors.lastname: Jiang
mesh_terms: D000693:Anaerobiosis; D001709:Biotechnology / Q000379:methods*; D005285:Fermentation; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D002365:Manihot / Q000378:metabolism*; D008697:Methane / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D013464:Sulfuric Acids / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D013464:Sulfuric Acids; C033158:sulfuric acid; D008697:Methane