Abstract
The pretreatment of oily sludge by wet air oxidation (WAO) technique was investigated. The effect of reaction parameters such as temperature, initial chemical oxygen demand (COD), residence time, catalyst type, concentration of catalyst and O2 excess on the COD removal rate was investigated. The results showed that oily sludge had a high COD removal rate by WAO. Adding the catalyst significantly improved the COD removal rate. Homogeneous catalyst, Mn2+, showed a significant removal rate for pollutants. The COD removal rate was 96·8% by catalytic wet air oxidation (CWAO) over Mn2+ catalyst. The results indicated that the CWAO was an effective pretreatment method for the oily sludge.
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