Experimental study on performance of ozonation disintegration for excess sludge reduction
臭氧处理剩余污泥的减量化实验研究

Continuous experiments in lab scale process were carried out to study the effect of excess sludge ozonation and reduce the cost of sludge reduction. During the treatment process, various parameters characterizing sludge were investigated. A substantial reduction in the volume of sludge was observed. After ozone consumption of 40 minutes, the removal efficiencies of total solid(TS) and volatile total solid (VTS) increased to 57.33% and 72.76%, respectively. Soluble chemical oxygen demand (SCOD) proliferated as a consequence of extending the ozone feeding time in the first 30 minutes, and rose to a final concentration of 6 298.32 mg/L from the original 3 501.24 mg/L, demonstrating a growth rate of 79.88%. A steady decline both in 30 min settled sludge volume (SV30) and water content of sludge cake was observed through ozonation, which suggested that ozonation could improve both of the sedimentation and dewatering performances. These facts suggested a remarkable effect of the sludge reduction by ozonation.