This study aimed to investigate the influence of the conditioning properties such as pH, mixing speed and reaction time on the dewaterability of sewage sludge and compare the performance with the derived conditions at the different solid concentrations. Performance parameters including time to filter test (TTF), specific resistance to filtration (SRF) and water content showed the optimum result at the pH value of 3, the rapid mixing speed of 200 rpm, and the slow reaction time of 20 min. In case of 20,000 mg/L of TS, a dosage of 1.0 g inorganic conditioner/L-sludge decreased TTF, SRF, water content of dewatered sludge cake, turbidity of the supernatant from 146 to 22 sec, 2.0 × 1014 to 0.4 × 1014 m/kg, 81.6 to 74.8% and 112 to 51 NTU, respectively.

• 김정호(국립한경대학교 환경공학과) | Jeong-Ho Kim
• 남세용(국립한경대학교 환경공학과) | Se-Yong Nam Corresponding author