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Institut für Wasser- und Umweltsystemmodellierung - IWS



"Transport of Nano-Sized Zero-Valent Iron Particles in an Aquifer"

Recently a new technique in groundwater remediation is getting more attention. Instead of the more common pump and treat or PRB treatments, this technique is all about injecting remediation particles directly in the contaminated zone. Often, nano-sized zero-valent iron particles (NZVI-particles) are used for injection.

Experimental set-up:
This thesis determines hydrogeologic characteristics that play a role in the spread of (NZVI-particles) when injected into a confined aquifer by conducting a tracer test and a Darcy Experiment in an artificial, confined aquifer. Furthermore, it shows the contemporary state of development of a measurement technique designed to monitor the spread of those particles by comparing two versions of inductive iron detectors (iFeD’s). Finally, NZVI particles will be injected into the artificial confined aquifer and the actual spread of the injected iron is measured by carrying out a chemical analysis.

All calculated parameters for the artificial aquifer fall within field range. The tracer test yielded sufficient data for this, but improvement of the methods of this experiment are needed. From the two tested iFeD’s a significant improvement was seen in the newest version, making it ready for implementation on field scale if the temperature dependency is solved. The iron injection was a success and the chemical analysis returned very plausible values compared to previous experiments.