The Impact of Silver Nanoparticles on the Composting of Municipal Solid Waste

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• 作者：Alireza Gitipour ; Amro El Badawy ; Mahendranath Arambewela ; Bradley Miller ; Kirk Scheckel ; Michael Elk ; Hodon Ryu ; Vicente Gomez-Alvarez ; Jorge Santo Domingo ; Stephen Thiel ; Thabet Tolaymat
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：December 17, 2013
• 年：2013
• 卷：47
• 期：24
• 页码：14385-14393
• 全文大小：444K
• 年卷期：v.47,no.24(December 17, 2013)
• ISSN：1520-5851

文摘

The study evaluates the impact of polyvinylpyrrolidone (PVP) coated silver nanoparticles (PVP-AgNPs) on the composting of municipal solid waste. The results suggest that there was no statistically significant difference in the leachate, gas, and solid quality parameters and overall composting performance between the treatments containing the AgNPs, Ag⁺, and negative control. Nonetheless, taxonomical analyses of 25 Illumina 16S rDNA barcoded libraries containing 2鈥?93鈥?04 sequences indicated that the bacterial communities in composted samples were highly diverse and primarily dominated by Clostridia (48.5%), Bacilli (27.9%), and beta-Proteobacteria (13.4%). Bacterial diversity studies showed that the overall bacterial community structure in the composters changed in response to the Ag-based treatments. However, the data suggest that functional performance was not significantly affected due to potential bacterial functional redundancy within the compost samples. The data also indicate that while the surface transformation of AgNPs to AgCl and Ag₂S can reduce the toxicity, complexation with organic matter may also play a major role. The results of this study further suggest that at relatively low concentrations, the organically rich waste management systems鈥?functionality may not be influenced by the presence of AgNPs.