title: Enhancing ethanol production from thermophilic and mesophilic solid digestate using ozone combined with aqueous ammonia pretreatment.
abstract: Pretreatment with ozone combined with aqueous ammonia was used to recover residual organic carbon from recalcitrant solid digestate for ethanol production after anaerobic digestion (AD) of rice straw. Methane yield of AD at mesophilic and thermophilic conditions, and ethanol production of solid digestate were investigated. The results showed that the methane yield at thermophilic temperature was 72.2% higher than that at mesophilic temperature under the same conditions of 24days and 17% solid concentration. And also the ethanol production efficiency of solid digestate after thermophilic process was 24.3% higher than that of solid digestate after mesophilic process. In this study, the optimal conditions for integrated methane and ethanol processes were determined as 55°C, 17% solid concentration and 24days. 58.6% of glucose conversion, 142.8g/kg of methane yield and 65.2g/kg of ethanol yield were achieved, and the highest net energy balance was calculated as 6416kJ/kg.
authors: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China; Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China; Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA.
authors: Dianlong
authors: D
authors: Wang
authors: Biogas Institute of Ministry of Agriculture, Chengdu 610041, China.
authors: Jiang
authors: J
authors: Xi
authors: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China; Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China. Electronic address: aiping@mail.hzau.edu.cn.
authors: Ping
authors: P
authors: Ai
authors: Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA.
authors: Liang
authors: L
authors: Yu
authors: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China.
authors: Hong
authors: H
authors: Zhai
authors: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China; Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China.
authors: Shuiping
authors: S
authors: Yan
authors: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China; Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China.
authors: Yanlin
authors: Y
authors: Zhang
mesh_terms: D000641:Ammonia / Q000494:pharmacology*; D000693:Anaerobiosis / Q000187:drug effects; D056804:Biofuels; D003460:Crystallization; D000431:Ethanol / Q000378:metabolism*; D005947:Glucose / Q000032:analysis; D006868:Hydrolysis; D008697:Methane / Q000378:metabolism; D012275:Oryza / Q000737:chemistry / Q000187:drug effects; D010126:Ozone / Q000494:pharmacology*; D013696:Temperature; D014866:Waste Products; D014961:X-Ray Diffraction
chemical_list: D056804:Biofuels; D014866:Waste Products; D000431:Ethanol; D010126:Ozone; D000641:Ammonia; D005947:Glucose; D008697:Methane
keywords: Anaerobic digestion; Ethanol fermentation; Methane; Pretreatment; Solid digestate