Removal of chromium(VI) from drinking water by redox-assisted coagulation with iron(II)

Batch experiments were conducted to determine whether sub-ppb concentrations of dissolved Cr(VI) could be achieved by redox-assisted coagulation with Fe(II). in this process Fe(II) acts as a reductant for Cr(VI) and, after its oxidation to Fe(Ill), as a coagulant. With an Fe(II) dose of 30 muM (1.7 mg/l as Fe), dissolved Cr(VI) concentrations in synthetic or natural Colorado River water (CRW) at pH 8.2 could be decreased from an initial value of 1 muM (52 mug/l) to