Waste sludge disintegration and bound water reduction by chemical oxidation: A comparative study

Waste sludge disintegration and bound water reduction was investigated by comparative chemical oxidation using calcium hypochlorite, hydrogen peroxide, peroxymonusulfate peroxydisulfate in the study. Response surface methodology (RSM) with Box-Benhken Design (BBD) used to determine operating parameters namely initial pH (2–10), oxidant dosage (5–85 mg/g TSS), Fe2+ ratio; 0.2-2) time (20–100 min). According ANOVA results, determination coefficient (R2) found 93.2%, 76.3%, 84% 84.8% for each oxidant, respectively. Under optimum conditions, degree terms of oxygen demand (DDCOD) calculated 11.09%, 5.23%, 10.75%, 5.34%, Furthermore, (BWR) waste increased after process, 33.52%, 24.56%, 44.63% 32.80% BWR values were obtained under same conditions. Results show that higher DDCOD achieved hypochlorite peroxymonosulfate treatment.