厌氧处理结合超声空化高效破解剩余污泥

Disintegrating Efficiently of Excess Sludge by Combined Anaerobic Treatment and Ultrasonic Cavitation

为了提高超声空化破解剩余污泥的效率,进而提高污泥的可生化性能,提出先进行短时间的厌氧处理,再进行超声空化的破解方案;并对厌氧0~6 d的污泥进行了超声破解实验研究.实验结果显示：随着厌氧时间的增加,污泥自身性质发生较大改变,如化学需氧量（COD）、肽聚糖浓度大幅度增加,p H值明显降低等;对厌氧污泥进行破解,其破解效果优于新鲜污泥：对厌氧6 d的污泥进行破解,其COD浓度是新鲜污泥的99.3倍,是新鲜污泥破解后的9.5倍.厌氧处理可以降低污泥的破解难度,在较大程度上提高超声空化强度,该工艺可以实现高效破解剩余污泥的目的.

In order to improve the efficiency of disintegrating excess sludge and then to improve the performance of sludge biodegradability by using ultrasonic cavitation, a program of disintegrating excess sludge by ultrasonic cavitation after a short anaerobic treatment was proposed. In the experiment,excess sludge was treated 0 ~ 6 days by anaerobic digestion and then disintegrated by ultrasonic cavitation. The results showas follows： with increasing of anaerobic digestion time, the properties of sludge change greatly, for example, the concentration of chemical oxygen demand（ COD） and peptidogly can increase significantly,while the p H value drop observably. The efficiency of using ultrasonic cavitation method to disintegrate excess sludge after a process of anaerobic digestion is better than disintegrating excess sludge directly. For example,the result of disintegrating the excess sludge treated 6 days by anaerobic digestion shows that the concentration of COD is 99. 3 times of the sludge without disintegrating,and 9. 5 times of excess sludge without anaerobic digestion. This study considers that anaerobic digestion can reduce the difficulty of sludge disintegrating and the process of anaerobic digestion can significantly improve the intensity of ultrasonic cavitation to a large extent. Therefore,the process can achieve the aim of disintegrating the excess sludge efficiently.