title: Optimization of the alkaline pretreatment of rice straw for enhanced methane yield.
abstract: The lime pretreatment process for rice straw was optimized to enhance the biodegradation performance and increase biogas yield. The optimization was implemented using response surface methodology (RSM) and Box-Behnken experimental design. The effects of biodegradation, as well as the interactive effects of Ca(OH)2 concentration, pretreatment time, and inoculum amount on biogas improvement, were investigated. Rice straw compounds, such as lignin, cellulose, and hemicellulose, were significantly degraded with increasing Ca(OH)2 concentration. The optimal conditions for the use of pretreated rice straw in anaerobic digestion were 9.81% Ca(OH)2 (w/w TS), 5.89 d treatment time, and 45.12% inoculum content, which resulted in a methane yield of 225.3 mL/g VS. A determination coefficient (R(2)) of 96% was obtained, indicating that the model used to predict the anabolic digestion process shows a favorable fit with the experimental parameters.
authors.affiliation: College of Forestry, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
authors.forename: Zilin
authors.initials: Z
authors.lastname: Song
authors.forename: Gaihe
authors.initials: G
authors.lastname: Yang
authors.forename: Xinhui
authors.initials: X
authors.lastname: Han
authors.forename: Yongzhong
authors.initials: Y
authors.lastname: Feng
authors.forename: Guangxin
authors.initials: G
authors.lastname: Ren
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D056804:Biofuels; D017610:Calcium Compounds / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry; D005227:Fatty Acids / Q000737:chemistry; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D008031:Lignin / Q000737:chemistry; D008697:Methane / Q000737:chemistry*; D012275:Oryza; D010087:Oxides / Q000737:chemistry*; D018547:Plant Stems / Q000378:metabolism*; D013696:Temperature
chemical_list: D056804:Biofuels; D017610:Calcium Compounds; D005227:Fatty Acids; D010087:Oxides; D002482:Cellulose; D008031:Lignin; C016538:lime; D008697:Methane