Effect of Sand Co-Presence on CrVI Removal in Fe0-H2O System

The aim of the present study was to provide new knowledge regarding effect non-expansive inert material addition on anionic pollutant removal efficiency in Fe0-H2O system. Non-disturbed batch experiments and continuous-flow-through column tests were conducted using CrVI as a redox–active contaminant three different systems: “Fe0 + sand”, only” ”sand only”. Both experimental procedures have advantage that formation (hydr)oxide layers Fe0 is not altered, which makes them appropriate proxies for real Fe0-based filter technologies. Batch carried out at pH 6.5 showed slight improvement 20% system, compared 50, 80 100% systems. Column supported results experiments, revealing highest efficiencies sand” systems with lowest ratio. However, positive sand co-presence decreases increasing from 7.1. Scanning electron microscopy—energy dispersive angle X-ray spectrometry diffraction spectroscopy employed characterization before after indicated higher volumetric ratio more intense corrosion processes affecting grains. Results presented herein indicate capacity sustaining outcomes suggest Fe0:sand = 1:3 could assure only long-term permeability filters, but also enhanced contaminated water.