Degradation of ethylene glycol using Fentonʹs reagent and UV

Oxidation of ethylene glycol in aqueous solutions was found to occur with the addition of Fentonʹs reagent with further conversion observed upon UV irradiation. The pH range studied was 2.5–9.0 with initial H2O2 concentrations ranging from 100 to 1000 mg/l. Application of this method to airport storm-water could potentially result in reduction of chemical oxygen demand by conversion of ethylene glycol to oxalic and formic acids. Although the amount of H2O2 added follows the amount of ethylene glycol degraded, smaller H2O2 doses were associated with increases in the ratio of ethylene glycol removed per unit H2O2 added indicating the potential of pulsed doses or constant H2O2 feed systems. Ethylene glycol removal was enhanced by exposure to UV light after treatment with Fentonʹs reagent, with rates dependent on initial H2O2 concentration. In addition to ethylene glycol, the principle products of this reaction, oxalic and formic acids, have been shown to be mineralized in other HO√ generating systems presenting the potential for ethylene glycol mineralization in this system with increased HO√ production.