Micro-aerobic conditions based on membrane-covered improves the quality of compost products: Insights into fungal community evolution and dissolved organic matter characteristics

• Published in: Bioresource technology Vol. 362; p. 127849
• Main Authors: Fang, Chen, Yuan, Xiangru, Liao, Keke, Qu, Huiwen, Han, Lujia, He, Xueqin, Huang, Guangqun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2022
• Subjects: Aerobic composting; Dissolved organic matter transformation; Fungal community composition; Molecular membrane; Aerobic composting; Dissolved organic matter transformation; Fungal community composition; Molecular membrane
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2022.127849

[Display omitted] •Micro-aerobic conditions improved compost product quality.•Micro-aerobic conditions were conducive to DOC generation and retention.•Aromatic polymerization was greater under micro-aerobic than static conditions.•Mycothermus dominated the composting process.•The proportion of soil saprotrophs was 5.18% higher after micro-aerobic composting. This study investigated the effects of micro-aerobic conditions on fungal community succession and dissolved organic matter transformation during dairy manure membrane-covered composting. The results showed that lignocellulose degradation in the micro-aerobic composting group (AC: oxygen concentration < 5 %) was slower than that in the static composting group (SC: oxygen concentration < 1 %), but the dissolved organic carbon in AC was greatly increased. The degree of aromatic polymerization was higher in AC than in SC. But the carboxyl carbon and alcohol/ether biodegradations were faster in SC than in AC, which promoted carbon dioxide and methane emissions, respectively. The relative abundances of pathogenic and dung saprotrophic fungi in AC were 44.6 % and 10.59 % lower than those in SC on day 30, respectively. Moreover, the relative abundance of soil saprotrophs increased by 5.18 % after micro-aerobic composting. Therefore, micro-aerobic conditions improved the quality of compost products by influencing fungal community evolution and dissolved organic matter transformation.