超声波-复合絮凝剂对石化厂剩余污泥脱水的研究

Study on the application of ultrasonic-composite flocculants to residual sludge dewatering in petrochemical water treatment plants

以污泥含水率为考察指标,研究了超声波-复合絮凝剂对石化厂剩余污泥脱水效果的影响。实验结果表明,复合絮凝剂的脱水效果优于单一絮凝剂;污泥采用复合絮凝剂PAM-PAFC进行絮凝脱水,在投加质量浓度190mg/L、m(PAM)∶m(PAFC)=1∶1条件下,再经20kHz、400W/m2超声处理2.5min后,污泥含水率从97%降至79%,污泥体积缩小86%左右,比仅投加PAM处理时污泥含水率降低5%左右。可见,超声波-复合絮凝剂可以强化污泥脱水,在提高污泥脱水效果的同时,减少了有机絮凝剂PAM的用量,降低了污泥处理成本。

Sludge water content has been detected as the index to indicate the effect of ultrasonic and composite flocculants on the residual activated sludge in petrochemical water treatment plants. The results show that the dewatering result of composite flocculants is better than that of a single flocculants. When the sludge is treated with composite flocculants PAM-PAFC （the total dosage is 190 mg/L） at the optimal composite ratio which is 1：1 （the ratio of mass）firstly,then treated by ultrasonics at 20 kHz,400 W/m^2 for 2.5 min, the sludge water content can be decreased from 97% to 79%, the sludge volume could be reduced by 86%, and sludge water content is 5% lower than that with only PAM. So,ultrasonic treatment combined with composite flocculants can improve sludge dewatering rates. At the same time,it cuts down the disposal cost,and reduces the dosage of organic flocculant PAM.