臭氧处理剩余污泥的减量化实验研究

采用质子交换聚合物膜电解法（PEM）产生臭氧,单独对剩余污泥进行氧化破解实验,结果表明,随着臭氧化反应时间的增加,污泥微生物细胞裂解,胞内物质进入到污泥溶液中,污泥固体物质减少,使得TS和VTS均显著下降,处理40 min后,其去除率分别达到57.33%和72.76%;SCOD前30 min呈线性增长,通入臭氧60 min后,由处理前的3 501.24mg/L上升到6 298.32 mg/L,增长率达79.88%;SV30及滤饼含水率均呈下降趋势,表明剩余污泥的沉淀性能及脱水性能得到明显改善。实验结果表明,直接利用臭氧对剩余污泥进行处理,可获得良好的减量化效果。

Experimental study on performance of ozonation disintegration for excess sludge reduction

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.