Influence of Water Salinity on the Efficiency of Fe0-Based Systems for Water Treatment

Metallic iron (Fe0) is a reactive material for treating polluted water. The effect of water salinity on the efficiency Fe0-based remediation systems not yet established. This work aims to clarify reasons why Cl− ions are often reported improve Fe0/H2O systems. Quiescent batch experiments were carried out characterize chloride (Cl−) methylene blue (MB) discoloration in presence Fe0. was used form NaCl at concentrations ranging from 0 40 g L−1. MB concentration 10 mg L−1, Fe0 loading 5 and duration experiment varied 2 46 days. Four different materials tested parallel experiments. Tests with levels performed three other organic dyes: Methyl orange (MO), II (OII), red 120 (RR 120). results clearly show that reduces extent dye all investigated. dyes increased order < MO RR OII. In varying concentrations, initially decreases increasing slightly increases [NaCl] > 30 However, = L−1 remains much lower than system demonstrate fundamentally delays process contaminant removal systems, thus improving understanding interactions These also suggest effects inorganic anions should be revisited design field applications.