Anaerobic Co-Digestion of Pig Manure and Rice Straw: Optimization of Process Parameters for Enhancing Biogas Production and System Stability

Pengjiao Tian, Binbin Gong, Kaijian Bi, Yuxin Liu, Jing Ma, Xiqing Wang, Zhangsun Ouyang () and Xian Cui ()
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Pengjiao Tian: College of Food Science and Technology, Hubei University of Arts and Science, Xiangyang 441053, China
Binbin Gong: College of Life Science, Xingtai University, Xingtai 054001, China
Kaijian Bi: College of Food Science and Technology, Hubei University of Arts and Science, Xiangyang 441053, China
Yuxin Liu: Jiangxi Rural Energy and Enviroment Agency, Nanchang 330031, China
Jing Ma: Jiangxi Rural Energy and Enviroment Agency, Nanchang 330031, China
Xiqing Wang: College of Food Science and Technology, Hubei University of Arts and Science, Xiangyang 441053, China
Zhangsun Ouyang: Jiangxi Rural Energy and Enviroment Agency, Nanchang 330031, China
Xian Cui: State Key Laboratory of Food Science and Technology, Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China

IJERPH, 2023, vol. 20, issue 1, 1-14

Abstract: The objective of this study was to optimize the process parameters of the anaerobic co-digestion of pig manure and rice straw to maximize methane production and system stability. In this study, batch experiments were conducted with different mixing ratios of pig manure and rice straw (1:0, 1:1, 1:5, 1:10, and 0:1), total solid concentrations (6%, 8%, 10%, 12%, and 14%), and inoculum accounts (5%, 10%, 15%, 20%, and 25%). The results show that a 1:5 mixing ratio of pig manure to rice straw, a 12% total solid content, and a 15% inoculum account yielded biogas up to 553.79 mL/g VS, which was a result of co-digestion increasing the cooperative index (CPI > 1). Likewise, the evolution of the pH and VFAs indicated that the co-digestion system was well-buffered and not easily inhibited by acidification or ammonia nitrogen. Moreover, the results of the Gompertz model’s fitting showed that the cumulative methane production, delay period, effective methane production time, and methane production rate under optimal conditions were significantly superior compared to the other groups employed.

Keywords: Anaerobic co-digestion; rice straw; pig manure; biogas; model analysis (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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