title: Methane Production from Rice Straw Hydrolysate Treated with Dilute Acid by Anaerobic Granular Sludge.
abstract: The traditional anaerobic digestion process of straw to biogas faces bottlenecks of long anaerobic digestion time, low digestion rate, less gas production, etc., while straw hydrolysate has the potential to overcome these drawbacks. In this study, the dilute sulphuric acid-treated hydrolysate of rice straw (DSARSH) containing high sulfate was firstly proved to be a feasible substrate for methane production under mesophilic digestion by granular sludge within a short digestion time. Batch anaerobic digestion process was operated under different initial chemical oxygen demand (COD) values at temperature of 37 °C with the pH of 8.5. Among the initial COD values ranging from 3000 to 11,000 mg/L, 5000 mg/L was proved to be the most appropriate considering high COD removal efficiency (94.17 ± 1.67 %), CH4 content (65.52 ± 3.12 %), and CH4 yield (0.346 ± 0.008 LCH4/g COD removed) within 120 h. Furthermore, when the studied system operated at the initial COD of 5000 mg/L, the sulfate removal ratio could reach 56.28 %.
authors.affiliation: Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Functional Foods, Ministry of Agriculture, Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou, 510610, People's Republic of China. jingrongcheng@hotmail.com.|Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, 133 Yihenglu, Dongguanzhuang, Tianhe District, Guangzhou, 510640, People's Republic of China. jingrongcheng@hotmail.com.
authors.forename: Jing-Rong
authors.initials: JR
authors.lastname: Cheng
authors.affiliation: Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Functional Foods, Ministry of Agriculture, Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou, 510610, People's Republic of China.
authors.forename: Xue-Ming
authors.initials: XM
authors.lastname: Liu
authors.affiliation: Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences, Key Laboratory of Functional Foods, Ministry of Agriculture, Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou, 510610, People's Republic of China.
authors.forename: Zhi-Yi
authors.initials: ZY
authors.lastname: Chen
mesh_terms: D000143:Acids; D000693:Anaerobiosis; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis*; D012275:Oryza / Q000378:metabolism*; D012722:Sewage
chemical_list: D000143:Acids; D012722:Sewage; D008697:Methane
keywords: Anaerobic digestion; DSARSH; Granular sludge; Methane production; Sulfate