超声预处理对污泥絮凝脱水性能的影响

为确定超声预处理对污泥脱水性能的影响,在固定频率为25 kHz、不同声强及作用时间下,考察和比较了超声预处理前后污泥结合水及过滤比阻的变化,并就超声预处理污泥的絮凝脱水性能进行了相关测试.结果表明,低声强（0.1～0.15 W/mL）、短时间（2～3 min）的超声预处理可有效降低污泥的结合水量及过滤比阻;当药剂投量相同时,经超声预处理的污泥絮凝脱水性能明显优于未预处理的污泥,即采用超声预处理改善污泥脱水性能是可行的.

Influence of Ultrasonic Pretreatment on Sludge Flocculating and Dewatering Performances

In order to determine the effects of ultrasonic treatment on dewatering characteristics of sludge,under the conditions of ultrasound frequency of 25 kHz,different ultrasound intensities and treatment times, the comparison and analysis on variations of the bound water of sludge and the specific resistance of filtration before and after ultrasonic pretreatment were conducted.The flocculating and dewatering performances of sludge with ultrasonic pretreatment were tested.The results show that the ultrasonic treatment with lower ultrasound intensities(0.1-0.15 W/mL) and short times(2-3 minutes) can effectively reduce the bound water of sludge and the specific resistance of filtration.Under the same dosage conditions,the flocculating and dewatering performance of sludge with ultrasonic pretreatment is obviously better than that of sludge without ultrasonic pretreatment,showing that ultrasonic pretreatment is feasible for improving dewatering performance of sludge.