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Membrane Water Treatment
  Volume 13, Number 1, January 2022 , pages 29-37
DOI: https://doi.org/10.12989/mwt.2022.13.1.029
 


Engineered nanoparticles in wastewater systems: Effect of organic size on the fate of nanoparticles
Soohoon Choi, Ching-Lung Chen, Murray V. Johnston, Gen Suh Wang and Chin-Pao Huang

 
Abstract
    To verify the fate and transport of engineered nanoparticles (ENP), it is essential to understand its interactions with organic matter. Previous research has shown that dissolved organic matter (DOM) can increase particle stability through steric repulsion. However, the majority of the research has been focused on model organic matter such as humic or fulvic acids, lacking the understanding of organic matter found in field conditions. In the current study, organic matter was sampled from wastewater treatment plants to verify the stability of engineered nanoparticles (ENP) under field conditions. To understand how different types of organic matter may affect the fate of ENP, wastewater was sampled and separated based on their size; as small organic particular matter (SOPM) and large organic particular matter (LOPM), and dissolved organic matter (DOM). Each size fraction of organic matter was tested to verify their effects on nano-zinc oxide (nZnO) and nano-titanium oxide (nTiO2) stability. For DOM, critical coagulation concentration (CCC) experiments were conducted, while sorption experiments were conducted for organic particulates. Results showed that under field conditions, the surface charge of the particles did not influence the stability. On the contrary, surface charge of the particles influenced the amount of sorption onto particulate forms of organic matter. Results of the current research show how the size of organic matter influences the fate and transport of different ENPs under field conditions.
 
Key Words
    attachment; critical coagulation concentration; dissolved organic matter; fate and transport; TiO2 and ZnO nanoparticles
 
Address
Soohoon Choi: Department of Civil and Environmental engineering, University of Delaware, Newark, DE 19711, USA/ Department of Environmental Engineering, Chungnam University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea

Ching-Lung Chen:Department of Civil and Environmental engineering, University of Delaware, Newark, DE 19711, USA/ Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan/ Center for Environmental Sustainability and Human Health, Ming Chi University of Technology, New Taipei City, 24301, Taiwan

Murray V. Johnston: Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19711, United States

Gen Suh Wang: Institute of Environmental Health, National Taiwan University, Taipei 100, Taiwan

Chin-Pao Huang: Department of Civil and Environmental engineering, University of Delaware, Newark, DE 19711, USA
 

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