Reduction of sewage sludge by ball mill pretreatment and Mn catalytic ozonation

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Reduction of sewage sludge by ball mill pretreatment and Mn catalytic ozonation

Lee, Myoung Joo / Kim, Tae Hyeong / Yoo, Ga Young / Min, Boo Ki / Hwang, Sun Jin

Abstract The effects of ball mill pretreatment and Mn catalytic ozonation on the reduction of sewage sludge were investigated. The ball mill pretreatment increased ΔSCOD from 2,000mg/L to 9,000 mg/L, as Total Solids (TS) increased from 1% to 4% at a specific energy of 75.8 KJ/g-TSS. The increase in disintegration ratio (DR), which is an index of the solubilization of sewage sludge, was consistent with that in TS, at the same specific energy input. With Mn catalytic ozonation treatment, the operational pH was varied from 3 to 6 using HCl at an ozone dose of 0.2 g-O3/g-TS; an optimum pH of 3 was determined. At pH 3, the removal efficiency of Total Suspended Solids (TSS) was 45%, the highest value compared with the other pH conditions. The combination of ball mill pretreatment and Mn catalyst ozonation could achieve 60% TSS removal efficiency. The removal efficiency by this combination was about twice as high as the case study of Mn catalyst ozonation treatment alone, without a ball mill pretreatment process.