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. 2018 Apr:253:112-120.
doi: 10.1016/j.biortech.2017.12.095. Epub 2017 Dec 29.

Pathway and mechanism of nitrogen transformation during composting: Functional enzymes and genes under different concentrations of PVP-AgNPs

Guangming Zeng  1 , Lihua Zhang  2 , Haoran Dong  2 , Yaoning Chen  2 , Jiachao Zhang  3 , Yuan Zhu  2 , Yujie Yuan  2 , Yankai Xie  2 , Wei Fang  2
Affiliations

Pathway and mechanism of nitrogen transformation during composting: Functional enzymes and genes under different concentrations of PVP-AgNPs

Guangming Zeng et al. Bioresour Technol. 2018 Apr.

Abstract

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 ammonia-oxidizing 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.

Keywords: Composting; Functional enzymes; Functional genes; Nitrogen transformation; PVP-AgNPs.

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