Application of Fenton's reagent combined with sawdust on the dewater ability of oily sludge

Abstract

The dewater ability of oily sludge by application of Fenton's reagent and sawdust was investigated. The results showed that the two main indexes, capillary suction time and specific resistance to filtration, which are used to evaluate the effect of dewater ability of the raw oily sludge, were reduced from 1750 s and 13.8×10 12 m/kg to 185 s and 1.5×10 12 m/kg, respectively. By optimizing experimental conditions, the best dosage of H2O2, Fe 2+ and sawdust and the best reaction time were determined to be 170mL/L, 216mg/L, 50wt. % and 40 min, respectively. Besides, the dry matter contents of sludge cakes and the properties of the supernatant were analyzed. The final results indicated that the oily sludge is more suitable for further treatment after combined process with Fenton's reagent and sawdust.