과산화수소 산화처리에 의한 정수슬러지의 감량화

Abstract

The effects of hydrogen peroxide treatment on the reduction of waterworks sludge were investigated inthis study. Sludge treated by peroxidation (H2O2 oxidation) was dewatered using a pressure filter at 3atm. Itwas observed that H2O2 treatment at the acidic condition significantly reduce both cake water content andspecific resistance to filtration (SRF), indicating the enhancement of dewaterability and filterability. Thefilterability by hydrogen peroxide treatment at pH 3.5 was better than acidic treatment and becamecomparable with polymer conditioning. The sludge filterability evaluated by SRF was optimal at a dose 2mlH2O2/sludge(0.02g H2O2/gTS) after adjusting of pH to 3.5. The H2O2 oxidation at pH 3.5 also producedeven more dewatered cake when compared with polymer conditioning. The reduction rate of sludge mass atan optimal condition showed 34% compared with untreated sludge. The effects of peroxidation on sludgeproperties including zeta potential, bound water and particle size were also evaluated. Peroxidation at theacidic condition reduced both bound water and zeta potential. By H2O2 combined with sulfuric acid leachediron caused Fenton’s reaction, which showed a potential to significantly reduce the amount of solids massand to produce more compact cake with higher filterability.