Monte Carlo simulations of the transformation and removal of Ag, TiO2 and ZnO nanoparticles in wastewater treatment and land application of biosolids

A - Papers appearing in refereed journals

Barton, L. E., Auffan, M., Durenkamp, M., McGrath, S. P., Bottero, J-Y. and Wiesner, M. R. 2015. Monte Carlo simulations of the transformation and removal of Ag, TiO2 and ZnO nanoparticles in wastewater treatment and land application of biosolids. Science of the Total Environment. 511 (1 April), pp. 535-543.

AuthorsBarton, L. E., Auffan, M., Durenkamp, M., McGrath, S. P., Bottero, J-Y. and Wiesner, M. R.
Abstract

The use of nano-enabled materials in industry and consumer products is increasing rapidly and with it, the more imperative it becomes to understand the consequences of such materials entering the environment during production, use or disposal. The novel properties of engineered nanomaterials (ENMs) that make them desirable for commercial applications also present the possibility of impacting aquatic and terrestrial environments in ways that may differ from materials in bulk format. Modeling techniques are needed to proactively predict the environmental fate and transport of nanomaterials.

A model for nanoparticle (NP) separation and transformation in water treatment was parameterized for three metal and metal-oxide NPs. Functional assays to determine NP specific distribution and transformation were used to parameterize the model and obtain environmentally relevant concentrations of NPs and transformation byproducts leaving WWTPs in effluent and biosolids. All three NPs were predicted to associate > 90% with the solid phase indicating significant accumulation in the biosolids. High rates of transformation for ZnO and Ag NPs resulted in ~ 97% transformation of the NPs that enter the plant despite differences in transformation rate in aerobic versus anaerobic environments. Due to high insolubility and negligible redox transformation, the only process predicted to impact TiO2 NP fate and transport in WWTPs was distribution between the solid and liquid phases. Subsequent investigation of ZnO NP species fate and transport when land applied in biosolids indicated that steady state concentrations of ZnO phases would likely be achieved after approximately 150 days under loading conditions of biosolids typical in current practice.

KeywordsNanoparticles; Exposure; Wastewater treatment; Monte Carlo modeling
Year of Publication2015
JournalScience of the Total Environment
Journal citation511 (1 April), pp. 535-543
Digital Object Identifier (DOI)doi:10.1016/j.scitotenv.2014.12.056
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
Kenyak yeye: UK-Australian Global Soil Meta-omic Programme
Transatlantic initiative for nanotechnology and the environment (TINE)
Output statusPublished
Publication dates
Online09 Jan 2014
Publication process dates
Accepted18 Dec 2014
Copyright licensePublisher copyright
PublisherElsevier Science Bv
ISSN0048-9697

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