Journal
JOURNAL OF INTEGRATIVE AGRICULTURE
Volume 20, Issue 5, Pages 1137-1146Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(20)63300-7
Keywords
aerobic composting; heavy metals; bacterial community; phosphate rock
Categories
Funding
- National Key Research and Development Program of China [2018YFD0500205]
- Strategic Priority Research Program of the Chinese Academy Sciences [XDA23070502]
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This study investigated the microbial mechanisms associated with heavy metal passivation during composting with phosphate rock amendment. Results showed that phosphate rock improved heavy metal passivation, with changes in bacterial communities influencing the process. The study provides insights into the use of heavy metal passivation techniques during composting.
Available information on the microbial mechanisms associated with heavy metal (HM) passivation during co-composting amended with phosphate rock (PR) remains limited. Thus, this study investigated the dynamic changes in bacterial communities and HM-fractions (Zn, Cu, Cd, Cr and Pb) during swine manure composting with maize straw, and ascertained the bacterial influence on HM-passivation. The results demonstrated that the addition of PR improved HM-passivation, especially for Zn and Cd, with their bioavailability factors (BFs) reduced by 247.41 and 176.25%, respectively. As for bacterial communities, the proportion of Firmicutes decreased, while the proportions of Proteobacteria, Bacteroidetes, DeinococcusThermus and Gemmatimonadetes increased in all treatments. PR significantly changed the primary bacterial phyla in the thermophilic phase. Bacteroidetes were the main bacterial component controlling the passivation of Zn, Cu and Cr, while Deinococcus-Thermus mainly regulated the mobility of Zn and Pb, and Proteobacteria only dominated the transformation among Cd-fractions. These results may provide a reference for the use of HM-passivation techniques during composting.
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