Micro-positive pressure significantly decreases greenhouse gas emissions by regulating archaeal community during industrial-scale dairy manure composting

Chen Fang; Huiwen Qu; Sanwei Yang; Guandi He; Ya Su; Xueqin He; Guangqun Huang

doi:10.1016/j.jenvman.2024.121163

Micro-positive pressure significantly decreases greenhouse gas emissions by regulating archaeal community during industrial-scale dairy manure composting

J Environ Manage. 2024 May 14:360:121163. doi: 10.1016/j.jenvman.2024.121163. Online ahead of print.

Authors

Chen Fang¹, Huiwen Qu², Sanwei Yang³, Guandi He³, Ya Su², Xueqin He², Guangqun Huang⁴

Affiliations

¹ College of Agriculture, Guizhou University, Guizhou Province, Guiyang, 550025, China; Engineering Laboratory for AgroBiomass Recycling & Valorizing, College of Engineering, China Agricultural University, Beijing, 100083, China.
² Engineering Laboratory for AgroBiomass Recycling & Valorizing, College of Engineering, China Agricultural University, Beijing, 100083, China.
³ College of Agriculture, Guizhou University, Guizhou Province, Guiyang, 550025, China.
⁴ Engineering Laboratory for AgroBiomass Recycling & Valorizing, College of Engineering, China Agricultural University, Beijing, 100083, China. Electronic address: huanggq@cau.edn.cn.

PMID: 38749130
DOI: 10.1016/j.jenvman.2024.121163

Abstract

In this study, the effects of micro-positive pressure formed by covering with a semipermeable membrane in the heating phase of dairy manure composting on greenhouse gas emissions and the mechanism of reducing methane emissions by the archaeal community were investigated. A large-scale experiment was conducted with semipermeable membrane-covered composting (SMC), forced aeration composting (FAC), and traditional static composting (TSC) groups. The results showed that the oxygen concentration and methanogen abundance were key factors in regulating methane emissions. In the heating phase of SMC, the micro-positive pressure could enhance the O₂ utilization rate and heating rate, resulting in Methanobrevibacter and Methanobacterium greatly decreasing, and the abundance of mcrA decreased by 90.03%, while that of pmoA did not increase. Compared with FAC and TSC, the cumulative methane emissions in SMC decreased by 51.75% and 96.04%, respectively. Therefore, the micro-positive pressure could effectively reduce greenhouse gas emissions by inhibiting the growth of methanogens.

Keywords: Archaeal community composition; Functional gene; Methane reduction; Semipermeable membrane; Solid fraction of dairy manure.