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Biocontained Carcass Composting for Control of Infectious Disease Outbreak in Livestock
Published on: May 6, 2010
Changes of bacterial necromass and their roles in humus conversion during organic wastes composting from different
Wenjie Chen1, Yan Yang2, Su Chang2
1College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, 100193 Beijing, China; School of Agriculture, Food and Ecosystem Sciences, The University of Melbourne, Victoria 3010, Australia.
Abstract:
This study compared the changes of bacterial necromass carbon (BNC) in composting of three distinct organic wastes [sewage sludge (SW), kitchen waste (KW), and pig manure (PM)] and their relationship with bacterial communities and humus formation. Results revealed that BNC content significantly differed across treatments, with KW exhibiting the highest level at 13 mg/g, followed by PM, where BNC changed between 8 % and 444 % of microbial biomass. Humification index and degree of polymerization indicated that PM had higher humification potential. Network analysis showed that key bacterial phyla contributing to BNC included Firmicutes in KW and Proteobacteria and Gemmatimonadota in SW and PM. Structural equation modeling demonstrated that BNC promoted the formation of humic acid in KW, while core bacteria facilitated the conversion of fulvic acid to humic acid in PM. These findings underscored the crucial role of bacterial necromass in enhancing humification and highlighted the distinct humification processes in composting.
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