Behavior of Engineered Nanoparticles in Landfill Leachate

    Authors

    S. C. Bolyard; D. R. Reinhart;S. Santra

    Comments

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    Abbreviated Journal Title

    Environ. Sci. Technol.

    Keywords

    TITANIUM-DIOXIDE NANOPARTICLES; HUMIC-ACID; ENVIRONMENTAL-IMPACT; ZNO; NANOPARTICLES; ORGANIC-MATTER; NANOMATERIALS; TOXICITY; FATE; AGGREGATION; ADSORPTION; Engineering, Environmental; Environmental Sciences

    Abstract

    This research sought to understand the behavior of engineered nanoparticles in landfill leachate by examining the interactions between nanoparticles and leachate components. The primary foci of this paper are the effects of ZnO, TiO2, and Ag nanoparticles on biological landfill processes and the form of Zn, Ti, and Ag in leachate following the addition of nanoparticles. Insight into the behavior of nanoparticles in landfill leachate was gained from the observed increase in the aqueous concentrations over background for Zn, Ti, and Ag in some tested leachates attributed to leachate components interacting with the nanoparticle coatings resulting in dispersion, dissolution/dissociation, and/or agglomeration. Coated nanopartides did not affect biological processes when added to leachate; five-day biochemical oxygen demand and biochemical methane potential results were not statistically different when exposed to nanoparticles, presumably due to the low concentration of dissolved free ionic forms of the associated metals resulting from the interaction with leachate components. Chemical speciation modeling predicted that dissolved Zn in leachate was primarily associated with dissolved organic matter, Ti with hydroxide, and Ag with hydrogen sulfide and ammonia; less than 1% of dissolved Zn and Ag was in the free ionic form, and free ionic Ti and Ag concentrations were negligible.

    Journal Title

    Environmental Science & Technology

    Volume

    47

    Issue/Number

    15

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    8114

    Last Page

    8122

    WOS Identifier

    WOS:000323013400007

    ISSN

    0013-936X

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