Abstract
Wet peroxide oxidation (WPO) and catalytic wet oxidation (CWO) of oily sludge were investigated. Greater than 80% chemical oxygen demand (COD) removal from oily sludge was achieved using sodium carbonate catalysed wet oxidation (WO) under the following conditions using a 0·5 l batch reactor: temperature of 330°C and concentration of sodium carbonate 200 mg/l. Greater than 90% COD removal was achieved using WPO under the following conditions: temperature of 330°C, residence time of 9 min, hydrogen peroxide excess (HE) of 0·8 and initial COD was 20 000 mg/l. Significantly more COD could be removed from oily sludge when HE was 0·8. BOD5/COD ratio was 0·52 after the oily sludge had been treated. It was concluded that WPO was a far more effective pretreatment method for removing organic compounds from oily sludge.
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