Hydrothermal and alkaline thermal pretreatment at mild temperature in solid state for physicochemical properties and biogas production from anaerobic digestion of rice straw. (August 2019)

• Record Type: Journal Article
• Authors: Du, Jing; Qian, Yuting; Xi, Yonglan; Lü, Xiwu
• Is Part Of: Renewable energy. Volume 139(2019)
• Page Start: 261
• Page End: 267
• Publication Date: 2019-08
• Subjects: Solid state -- Mild hydrothermal -- Alkaline thermal -- Pretreatment -- Anaerobic fermentation; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2019.01.097
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: The effect of hydrothermal pretreatment (HTP) and alkaline thermal pretreatment (TA) at mild temperature in the solid state was comparatively studied, through the analysis of physicochemical properties of rice straw and its biogas production during anaerobic digestion. The results indicated that TA visibly increased the biogas yield from HTP. The accumulative biogas production of volatile solids was the highest for TA3 up to 411.1 mL/g VS, in which increased 24.04% compared to control. Therefore, the use of TA is more favorable to improve biogas production rates of anaerobic fermentation with rice straw than HTP, however, the additives of calcium hydroxide are too high, but it is not conducive to promoting the biogas yield of rice straw. The best additives amount of Ca (OH)2 was 2% to consider the cost of pretreatment with straw. The research results provide technical support for pretreatment of anaerobic fermentation of lingo-cellulosic materials such as straw. Highlights: The effect of TA pretreatment on the biogas production rate of straw was more obvious than that of HTP. The cumulative gas production rate was the highest (411.1 mL / g) for the 5% calcium hydroxide group. The appropriate addition of 2% calcium hydroxide in TA pretreatment group was more economically from the point of view of engineering application.