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Institute of Hydraulic Engineering

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Calibration for “Magnetic Susceptibility Measurement System”
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descriptionNanoRem - Taking Nanotechnological Remediation Processes from Lab Scale to End User Applica-tion for the Restoration of a Clean Environment The utilization of nano particles (NP), especially zero valent iron nano (nZVI) particles (10 – 120nm), for remediation of contaminated soil and groundwater is a promising new technology. Due to the usage of nZVI in reactive barriers, their ability to degrade a variety of contaminants is already well known. Advantages of nZVI are the high reactivity and the possibility of targeted injection in form of aqueous suspensions.
At the research facility for subsurface remediation – VEGAS (University of Stuttgart) experiments are conducted to link research of nano particles on laboratory scale with end-user applications. The goal is the homogeneous emplacement of a defined mass of nZVI particles in a given reaction zone. By conducting column tests, different nZVI suspensions can be optimized regarding their transport in radial flow systems. Therefore, a one-dimensional column system – a so called Cascading Column System – was designed. By conducting cascading column experiments, the radial distribution of iron particle around a well can be reproduced. Therby experimental conditions (porous media, concentration, flow rate) can be fitted to boundary conditions of field situations. In the same time the effect of condition modification can be tested easily and conclusions can be drawn fast. Results of the new column systemcan be used for planning large scale injections and to predict particle distribution for empirically determined transport lengths. For all experiments a newly developed set-up including a specific measurement technology was used, which allows for the monitoring of all influencing factors. Particularly, space and time dependent propagation velocity of nZVI particles as well as the the distri-bution of the mass of sedimented nZVI can be measured qualitatively and quantitatively with a spe-cially designed magnetical susceptibility sensor.
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contactDipl.-Ing. Anke Wiener