Numerical simulation for reactive solute transport of arsenic in permeable reactive barrier column including zero-valent iron

Numerical modeling was developed in one dimensional solute transport including chemical reaction to simulate the permeable reactive barrier column results, in which arsenite (As(III)) was removed using zero-valent iron (ZVI). Removal principles of As(III) includes oxidation of As(III) to As(V), sorption of As(III) and sorption of As(V) at least. Each kinetic parameter was drawn in preliminary batch tests to integrate the simulation.The column simulation results show that As(V) adsorption rate was faster than the As(III) adsorption rate and that they are affected by the available mass of Fe(III) in the system. The model can be used to design and predict the long term performance of ZVI permeable reactive barriers (PRBs).