ABSTRACT
Fe(0) reaction walls (FERW) are reported as a cost effective alternative to classical pump & treat technologies for the remediation of Chromate and chlorinated hydrocarbon plumes. But critical and up to now more or less unknown factors controlling the long term performance (in most cases more than 10 years) are the evolution of permeability and reaction rates over time. These uncertainties make a prognosis with respect to the economical benefit of FERW quite difficult. In this study we present experimental results for long term performance predictions, which are based on numerous column studies with Fe(0) and TCE in the presence of common groundwater anions as Cl−, HPO4 2−, H2SiO4 2−, HCO3 −, NO3 −, CrO4 2−, SO4 2− and well defined humic acid.
