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Institut für Wasser- und Umweltsystemmodellierung - IWS



"Optimization of the Migration Properties of Nanofer 25s Nanoparticles in Porous Media using Cascading Columns"

Zero-Valent Iron (ZVI) has recently received much attention in In-Situ remediation technologies for remediating many groundwater pollutions such as Chlorinated Hydrocarbons (CHCs) and turning them into harmless compounds. CHCs are a group of chemicals composed of carbon, chlorine, and hydrogen with very low solubility. Their dissolution into groundwater will take over decades or centuries, forming plumes that can target rivers, lakes and drinking water wells. In the past permeable reactive barriers were used for treatment of plume, made by excavating trench and filling them with granular ZVI. But the problem with this method is that it can only remediate the plume but not the source zone. So a relatively new promising method came into consider. In this way nano- to micro- scale iron suspension have been injected into subsurface using injection wells, targeting the source zone of contamination. Although various injectable ZVI particles are already commercially available, there are still major uncertainties about their application. Many experimental and numerical researches have been done to characterize their transport in porous media. Nano sized iron particles are injectable and to some extend mobile in the subsurface, but it is still difficult to predict and verify the injection radius. Thus it needs more investigation to find the fundamental parameters for a successful application. Nanofer 25s is one of the commercially available products, produced by Czech company NANO IRON s.r.o. There are variable claims about migration properties of these particles which require a thorough investigation to help potential users choose the right concentration of injection slurry. In this research project, cascading columns experiments are conducted to get a better understanding of particles transport around an injection well. It has been shown that the transport distance of nano iron particles are affected by different parameters such as concentration of injection slurry, modifiers, discharge, permeability of porous media and seepage velocity