Integration of biogas and liquid recirculation enhance methane production in high-solid anaerobic digestion of pig manure and rice husks

Zhuoqi Xu; Wenbo Gu; Yuwei Shi; Baibing Li; Zhenya Zhang; Zhongfang Lei; Tian Yuan; Yanfei Cheng; Mijung Kim; Akio Shoji

doi:10.1016/j.biortech.2024.131807

Integration of biogas and liquid recirculation enhance methane production in high-solid anaerobic digestion of pig manure and rice husks

Bioresour Technol. 2024 Nov 12:131807. doi: 10.1016/j.biortech.2024.131807. Online ahead of print.

Authors

Zhuoqi Xu¹, Wenbo Gu², Yuwei Shi³, Baibing Li⁴, Zhenya Zhang⁵, Zhongfang Lei⁶, Tian Yuan⁷, Yanfei Cheng⁸, Mijung Kim⁹, Akio Shoji¹⁰

Affiliations

¹ Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected].
² Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected].
³ Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected].
⁴ Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected].
⁵ Institute of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected].
⁶ Institute of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected].
⁷ Institute of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: [email protected].
⁸ R & D Center, Oriental Shiraishi Corporation, 5 Kinugaoka, Mooka, Tochigi 321-4367, Japan. Electronic address: [email protected].
⁹ R & D Center, Oriental Shiraishi Corporation, 5 Kinugaoka, Mooka, Tochigi 321-4367, Japan; Technical Department, Oriental Shiraishi Corporation, 5-6-52 Toyosu, Koto-ku, Tokyo 135-0061, Japan. Electronic address: [email protected].
¹⁰ Technical Department, Oriental Shiraishi Corporation, 5-6-52 Toyosu, Koto-ku, Tokyo 135-0061, Japan. Electronic address: [email protected].

PMID: 39542055
DOI: 10.1016/j.biortech.2024.131807

Abstract

High-solid anaerobic digestion (HSAD) is a promising technology for treating livestock manure and agricultural waste; however, the wide application has been limited due to homogenization problems. This study established a novel HSAD system by integrating liquid and biogas recirculation (R_BL), aiming to enhance the biogas conversion efficiency of high-solid substrates at low costs. Results showed that the highest methane yield was 357 mL/gVS_added in the novel HSAD system (R_BL), 30.7 % and 251.7 % higher than those with only liquid recirculation (R_L) or with no recirculation (R_No). Biogas recirculation helped enhance dissolution and degradation of organic matter, and prevented the VFAs accumulation, contributing to the enhanced methane production in the novel HSAD system. The net electric energy benefit of R_BL was 301.2 kWh for treating 1-ton raw materials, suggesting the high economic feasibility of the novel HSAD system for the sustainable treatment of high-solid organic wastes.

Keywords: Biogas recirculation; Intermediate products; Liquid recirculation; Net electric energy benefit.