Enhancement of methane production by anaerobic digestion of corn straw with hydrogen-nanobubble water

Chao He; Hao Song; Liang Liu; Panpan Li; Mukesh Kumar Awasthi; Guizhuan Xu; Quanguo Zhang; Youzhou Jiao; Chun Chang; Yingkui Yang

doi:10.1016/j.biortech.2021.126220

Enhancement of methane production by anaerobic digestion of corn straw with hydrogen-nanobubble water

Bioresour Technol. 2022 Jan;344(Pt A):126220. doi: 10.1016/j.biortech.2021.126220. Epub 2021 Oct 29.

Authors

Affiliations

¹ Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Ministry of Agriculture and Rural Affairs, College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Henan International Joint Laboratory of Biomass Energy and Nanomaterials, Henan Agricultural University, Zhengzhou 450002, China.
² College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
³ Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Ministry of Agriculture and Rural Affairs, College of Mechanical & Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China; Henan International Joint Laboratory of Biomass Energy and Nanomaterials, Henan Agricultural University, Zhengzhou 450002, China. Electronic address: jiaoyouzhou@henau.edu.cn.
⁴ School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China.
⁵ Department of Sociology, Environmental and Business Economics, University of Southern Denmark, Esbjerg, Denmark.

PMID: 34715343
DOI: 10.1016/j.biortech.2021.126220

Abstract

Hydrogen-nanobubble water was proposed to enhance methane production by anaerobic digestion (AD) with corn straw. The effects of H₂-nanobubble water (H₂-NBW) amounts (0%, 20%, 40%, 60%, 80%, and 100%) on methane production characteristics of corn straw were explored. The results showed that the methane yields were increased by 11.54%∼25.29% compared with the control group(CK), and the maximum cumulative methane production reached to 254.36 mL·g-VS^-1 when the H₂-NBW addition was of 60%. Interestingly, the maximum methane concentration increased by 4.37% compared with CK. H₂-NBW addition can destroy the cellulose structure of corn straw, reduce the crystallinity of cellulose, and promote the hydrolysis. The degradation rate of cellulose and hemicellulose were increased by 20%∼33% and 13% ∼25.7% respectively, and the removal rate of TS and VS were increased by 6.82%-27.93% and 8.52%-21.47%, respectively. The modified Gompertz equation fitted the cumulative methane production curves very well, with high correlation coefficients (R² > 0.992).

Keywords: Anaerobic digestion; Corn straw; Hydrogen gas; Nanobubble.

MeSH terms

Anaerobiosis
Biofuels
Hydrogen*
Methane
Water
Zea mays*

Substances

Biofuels
Water
Hydrogen
Methane