ABSTRACT
The Total Variation Diminishing (TVD) algorithm (Zheng & Wang 1999) was selected which is feasible to reduce the influence of numerical dispersion effectively. The general grid was 4 × 4 m. The grid refinement at the wells was optimized by adjusting to a tracer breakthrough (O2) which was evaluated during the testing phase of the pilot plant. We received a good agreement with
1 INTRODUCTION
High Arsenic (As) concentrations up to 9 mg/L were found in the groundwater on a military site in Northern Germany. Laboratory experiments suggested that bivalent iron [Fe(II)] has the potential to immobilize As which is composed of inorganic as well as various organic species (Holländer et al. 2008; Krüger et al. 2008). Subsequently, a pilot plant was built at one of the hot-spots and within a two-year operational period, As concentration was reduced from 1.9 mg/L to less than 0.25 mg/L (Krüger et al. 2012).
