Effect of micro-aerobic conditions based on semipermeable membrane-covered on greenhouse gas emissions and bacterial community during dairy manure storage at industrial scale

• Published in: Environmental pollution (1987) Vol. 299; p. 118879
• Main Authors: Fang, Chen, Zhou, Ling, Liu, Ya, Xiong, Jinpeng, Su, Ya, Lan, Zefeng, Han, Lujia, Huang, Guangqun
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.04.2022
• Subjects: Bacterial diversity; Carbon Dioxide - analysis; Greenhouse Effect; Greenhouse gas emission; Greenhouse Gases - analysis; Manure - analysis; Methane - analysis; Nitrous Oxide - analysis; Semipermeable membrane; Solid dairy manure storage; Structural equation model; Greenhouse gas emission; Semipermeable membrane; Bacterial diversity; Structural equation model; Solid dairy manure storage
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2022.118879

This study evaluated the greenhouse gas emissions of solid dairy manure storage with the micro-aerobic group (MA; oxygen concentration <5%) and control group (CK; oxygen concentration <1%), and explained the difference in greenhouse gas emissions by exploring bacterial community succession. The results showed that the MA remained the micro-aerobic conditions, which the maximum and average oxygen concentrations were 4.1% and 1.9%, respectively; while the average oxygen concentrations of the CK without intervention management was 0.5%. Compared with the CK, carbon dioxide and methane emissions in MA were reduced by 78.68% and 99.97%, respectively, and nitrous oxide emission was increased by almost three times with a small absolute loss, but total greenhouse gas emissions decreased by 91.23%. BugBase analysis showed that the relative abundance of aerobic bacteria in CK decreased to 0.73% on day 30, while that in MA increased to 6.56%. Genus MBA03 was significantly different between the two groups (p < 0.05) and was significantly positively correlated with carbon dioxide and methane emissions (p < 0.05). A structural equation model also revealed that the oxygen concentration and MBA03 of the MA had significant direct effects on methane emission rate (p < 0.001). The research results could provide theoretical basis and measures for directional regulation of greenhouse gas emission reduction during dairy manure storage. [Display omitted] •Micro-aerobic conditions storage (MA) was an effective strategy for GHG reduction.•Methane and total GHG emissions in MA decreased by 99.97% and 91.23%, respectively.•The relative abundance of aerobic bacteria in MA30 was 5.83% greater than in CK30.•The inactivate of MBA03 in MA contributed to methane emission reduction.•Oxygen concentration had a significant negative effect on methane emission rate.