Leaching of nano-ZnO in municipal solid waste

•Leaching potential of 3 different types of nano-ZnO in real fresh MSW was investigated.•Batch tests were conducted at different pH, ionic strength and ZnO concentrations.•Most of the added nano-ZnO mass was retained within the solid waste matrix.•The pH and IS conditions did not significantly influ...

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Bibliographic Details
Published in:Journal of hazardous materials 2016-11, Vol.317, p.319-326
Main Authors: Sakallioglu, T., Bakirdoven, M., Temizel, I., Demirel, B., Copty, N.K., Onay, T.T., Uyguner Demirel, C.S., Karanfil, T.
Format: Article
Language:English
Subjects:
Landfill
Leachate
Modeling
Municipal solid waste
Nano-ZnO
Nanomaterial
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Summary:•Leaching potential of 3 different types of nano-ZnO in real fresh MSW was investigated.•Batch tests were conducted at different pH, ionic strength and ZnO concentrations.•Most of the added nano-ZnO mass was retained within the solid waste matrix.•The pH and IS conditions did not significantly influence the leaching behavior of ZnO.•A kinetic particle deposition/detachment model was developed to analyze ZnO behavior. Despite widespread use of engineered nanomaterials (ENMs) in commercial products and their potential disposal in landfills, the fate of ENMs in solid waste environments are still not well understood. In this study, the leaching behavior of nano ZnO -one of the most used ENMs- in fresh municipal solid waste (MSW) was investigated. Batch reactors containing municipal solid waste samples were spiked with three different types of nano ZnO having different surface stabilization. The leaching of ZnO was examined under acidic, basic and elevated ionic strength (IS) conditions. The results of the 3-day batch tests showed that the percent of the added nano-ZnO mass retained within the solid waste matrix ranged between 80% and 93% on average for the three types of nano-ZnO tested. The pH and IS conditions did not significantly influence the leaching behavior of ZnO. To further analyze the behavior of ZnO in the MSW matrix, a kinetic particle deposition/detachment model was developed. The model was able to reproduce the main trends of the batch experiments. Reaction rate constants for the batch tests ranged from 0.01 to 0.4 1/hr, reflecting the rapid deposition of nano-ZnO within the MSW matrix.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2016.05.094