超声波对污泥脱水性能的影响因素研究

The Study on the Influencing Factors of Ultrasonic Technology in Sludge Dewatering Properties

本实验主要研究了超声波技术在污泥沉降及脱水性能中的影响因素,包括超声波声强、处理时间、污泥浓度、污泥温度及不同类型的工具头等因素。实验发现,当超声处理45s时污泥的沉降性能很好且污泥干重较低,且合适的超声波声强是324W/m2,污泥浓度越大(浓度为4000—5000mg/L),超声处理效果越明显,同时控制污泥的温度在20℃以下,污泥的沉降效果较好。但污泥只要经过超声处理,污泥的比阻增大、上清液COD增大,且超声处理后加入PAM对其比阻并无多大改善。试验中通过不同的工具头的比较,表明管式工具头与探头式工具头相比,有一定的局限性。

This experiment mainly studied the influencing factors of ultrasonic technology in sludge settling and dewatering properties. The factors include ultrasonic energy intensity, treatment time, sludge concentration, sludge temperature and different types of tools head. The experiment showed that the optimal ultrasonic energy intensity is 324 W/m^2 and the optimal radiation time is 45s. In this case, the settling characteristics of sludge is well and the sludge dry weight is less. When sludge concentration （about 4000-5000 mg/L）inereased, the effects of ultrasound treatment becomes more obvious. At the same tine, controlling the temperature of the sludge below 20℃, the settlement of the sludge is better. However, as long as after ultrasonic treatment of sludge, sludge specific resistance increases, the supernatant COD increased, and adding PAM after ultrasonic treatment does not much to improve the specific resistance. Through the comparison of different tools head, the experiment showed that tube tool head has some limitations compared with the probe tool head.