Journal
BIORESOURCE TECHNOLOGY
Volume 357, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127350
Keywords
Compost humification; Biochar; Manganese sulfate; Microbial community; Biological mechanisms
Funding
- Key Research and Devel-opment Project of Qinghai Province, China [2019-NK-A11-03]
- National Natural Science Foundation of China [32172679]
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This study investigated the integrated use of biochar (BC) and Mn2+ in pig manure compost and found that it advanced the compost humification. The treatment with 0.50% Mn2+ and 5% BC showed the highest organic carbon degradation and humic acid production. Microbial community analysis revealed that the integrated use of BC and Mn2+ regulated the diversity and structure of organic matter-mineralizing microbes.
This study aimed to clarify the effect of the integrated addition of different proportions of biochar (0 and 5%) and MnSO4 (0, 0.25%, and 0.50%) to pig manure compost. The results indicated the integrated use of biochar (BC) and Mn2+ advanced the compost humification. In particular, the integrated use of 0.50% Mn2+ and 5% BC showed higher total organic carbon degradation (20.67%) and humic acid production (81.26 g kg-1) than other treatments. Microbial community analysis showed the integrated use of BC and Mn2+ regulated the diversity and community structure of organic matter-mineralizing microbes by maintaining the relative abundance of bacteria Firmicutes (54.62%) and Proteobacteria (38.05%) at high levels during the thermophilic period and boosting those of the fungi of Ascomycota (58.91%) and Actinobacteria (15.60%) during the maturity period of composting. This study illustrated the potential and biological mechanisms of integrating BC and Mn2+ as additives in compost humification.
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