Journal
BIORESOURCE TECHNOLOGY
Volume 253, Issue -, Pages 112-120Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.12.095
Keywords
PVP-AgNPs; Composting; Nitrogen transformation; Functional enzymes; Functional genes
Funding
- National Natural Science Foundation of China [51521006, 51378190, 51409100, 51408219]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
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Polyvinylpyrrolidone coated silver nanoparticles (PVP-AgNPs) were applied at different concentrations to reduce total nitrogen (TN) losses and the mechanisms of nitrogen bio-transformation were investigated in terms of the nitrogen functional enzymes and genes. Results showed that mineral N in pile 3 which was treated with AgNPs at a concentration of 10 mg/kg compost was the highest (6.58 g/kg dry weight (DW) compost) and the TN loss (47.07%) was the lowest at the end of composting. Correlation analysis indicated that TN loss was significantly correlated with amoA abundance. High throughput sequencing showed that the dominant family of ammoniaoxidizing bacteria (AOB) was Nitrosomonadaceae, and the number of Operational Taxonomic Units (OTUs) reduced after the beginning of composting when compared with day 1. In summary, treatment with AgNPs at a concentration of 10 mg/kg compost was considerable to reduce TN losses and reserve more mineral N during composting.
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