Characteristics of silver nanoparticles and microplastics co-migration in simulated landfill columns
HE Chang1, ZENG Xiao-lan1,2, ZHANG Cun-kuan1, XU Xiao-tang1, DING Wen-chuan1,2
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; 2. National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China
Abstract：Lab-scaled simulated landfill columns and synthetic leachate were prepared to investigate the transport of silver nanoparticles (AgNPs) and microplastics (MPs) in municipal solid waste landfill. The results showed that stability of AgNPs and MPs in leachate increased with the landfill time extending while they existed in a single system as well as in a binary system. Thus the migration ability of these pollutants in the landfill was promoted so that more pollutant particles could be discharged from the middle and aged landfill along with leachate. In comparison with single system, AgNPs and MPs coexisting system facilitated the transport of AgNPs but slightly inhibited the transport of MPs. In term of DLVO theory and colloidal filtration theory, it suggests that MPs of higher mobility could serve as carriers of AgNPs and compete with AgNPs for adsorption sites on the solid media, thereby promoting the transport of AgNPs. Inversely, the coexisting AgNPs could reduce the negative surface charge on the MPs to weaken the stability of pollutants particle, and could provide additional deposit sites for MPs through AgNPs pre-deposition on the solid media, thereby inhibiting the transport of MPs.
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