Kinetics of methane production and hydrolysis in anaerobic digestion of corn stover. (1st May 2016)

• Record Type: Journal Article
• Authors: Li, Dong; Huang, Xianbo; Wang, Qingjing; Yuan, Yuexiang; Yan, Zhiying; Li, Zhidong; Huang, Yajun; Liu, Xiaofeng
• Is Part Of: Energy. Volume 102(2016)
• Page Start: 1
• Page End: 9
• Publication Date: 2016-05-01
• Subjects: Anaerobic processes -- Biogas -- Modelling -- Kinetic parameters -- Hydrolysis -- Nonbiodegradable; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2016.02.074
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: In order to develop a time-saving method for determination of ultimate methane production, obtain the hydrolysis kinetic constant, and identify a determination method for the nonbiodegradable organic fraction of substrate ( VS NB ) of green and air-dried corn stover, the kinetics of methane production and hydrolysis were studied using batch tests. The results showed that the conventional first-order hydrolysis kinetic model was not suitable for describing the entire hydrolysis process of corn stover, because there were two first-order decay periods for hydrolysis of corn stover. The hydrolysis kinetic constants k H, 1 and k H, 2 of the first and second periods were 0.1701 and 0.0415 1/d for green stover and 0.1052 and 0.0360 1/d for air-dried stover. The value of VS NB could be obtained by the graphical method rather than by the hydrolysis kinetic model. The obtained VSNB contents were 12.9% and 24.7% of VS (volatile solid) for green and air-dried stover, respectively. The ultimate methane production and corresponding digestion time could be understood through the methane production kinetic model by digestion experiments within a short time. The ultimate methane productions were 347.1 and 319.4 mL/g based on VS and the corresponding digestion times were 69.2 and 182.3 days for green and air-dried stover, respectively. Highlights: The sectionalized hydrolysis constants were 0.1701 and 0.0415 1/d for green stover. The sectionalized hydrolysis constants were 0.1052 and 0.0360 1/d for air-dried stover. The ultimate methane production of green stover was 347.1 mL/g VS. The ultimate methane production of air-dried stover was 319.4 mL/g VS. The VS NB are 12.9% and 24.7% for green and air-dried corn stover.