Effects of the silica nanoparticles (NPSiO2) on the stabilization and transport of hazardous nanoparticle suspensions into landfill soil columns

• Published in: REM - International Engineering Journal 2017-09, Vol.70 (3), p.317-323
• Main Authors: Oliveira, Elizabeth Mendes de, Garcia-Rojas, Edwin Elard, Valadão, Izabella Christynne Ribeiro Pinto, Araújo, Adriana de Souza Forster, Castro, José Adilson de
• Format: Article
• Language: English
• Subjects: ENGINEERING, MECHANICAL; GEOLOGY; hazardous nanoparticles; MECHANICS; METALLURGY & METALLURGICAL ENGINEERING; silica nanoparticles (NPSiO2); soil column; transport
• ISSN: 2448-167X; 2448-167X
• DOI: 10.1590/0370-44672015700204

Abstract This study evaluates the stability and transport behaviors of hazardous nanoparticles into soil landfills using experimental procedures to simulate the effects of natural silica nanoparticle suspensions during their percolation into the soil layers of municipal waste landfills. For this, we prepared stabilized suspensions of nanoparticle oxides containing silicon (NPSiO2), titanium (NPTiO2), copper (NPCuO) and zinc (NPZnO), which are recognized as hazardous to the environment, and we conducted leaching experiments within the soil column by simulating landfills layers and simulating the capture and attenuation of nanomaterials into municipal waste landfills. The results demonstrated that the presence of NPSiO2 in suspensions increases the stable concentrations of copper, zinc and titanium oxides and strongly decreases soil layer effectiveness. In contrast, NPZnO improves effectiveness due to its ability to promote agglomeration and setting conditions, allowing further complexation.