Inderscience Publishers

Pre–treatment of refinery spent caustic by Fenton's reaction

Experimental results for applying Fenton oxidation as a pre–treatment method for spent caustic are presented. A combination of dilution and Fenton's reaction is proposed as a method for reduction of total COD and total phenols in spent caustics. This approach was used to obtain a decrease in total phenols from 5,200 mg/L to less than 130 mg/L. The greatest removal occurred within a pH range of 2.7–6, with a (Fe3+/H2O2) mass ratio of 1 : 3, Fe3+ concentration of 2.85 g/L and a stoichiometric w/w H2O2/COD ratio of 0.3. Under these conditions, and over 30 min reaction time, 99.5% of total phenols and 95.5% of COD were removed, while sulphides and mercaptans decreased to <0.1 mg/L.

Keywords: chemical oxidation, Fenton oxidation, spent caustic, coagulation, refinery waste, pre–treatment, total COD, chemical oxygen demand, total phenols, sludge, wastewater treatment

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