超声波对剩余污泥化学调理的影响

以污泥脱水性能与沉降性能为指标,研究了超声波预处理对剩余污泥经阳离子聚丙烯酰胺（CPAM）进行化学调理时污泥减量效果的影响。试验结果表明,单独采用CPAM对剩余污泥进行化学调理时的ρ（最佳添加量）为120 mg.L-1,污泥滤饼含水率为81.2%;单独采用超声波处理剩余污泥时的最佳声能密度为0.04 W.mL-1,此时的滤饼含水率为80.4%。而当在采用CPAM对剩余污泥进行化学调理前先进行超声波预处理后,污泥滤饼含水率降至72.2%。试验结果表明这种联合处理方式不仅使剩余污泥的脱水性能大为改善,并且最佳CPAM投加量降低至60 mg.L-1,最佳超声声能密度降至0.03 W.mL-1,这表明联合处理方法降低了污泥处理成本。

Influence of ultrasonic treatment in chemical conditioning of excess sludge

The dewaterability and settling property of the sludge have been selected as the indicators to study the effect of ultrasonic pretreatment on sludge reduction in chemical conditioning of excess sludge with cationic polyacrylamide（CPAM）.The test result of single addition of CPAM chemical conditioning shows that the optime udosage of CPAM was 120 mg.L-1 and with the moisture content of filter cake of 81.2%.And the optimum ultrasound energy density was 0.04 W.mL-1with the filter cake moisture content of 80.4% in the treatment of excess sludge with the single ultrasonic treatment.But the filter cake moisture content decreased to 72.2% when with the combination treatment with ultrasonic pretreatment before the chemical conditioning treatment of excess sludge.The results shows that the best dosage of CPAM decreased to 60 mg.L-1and the best ultrasound energy density decreased to 0.03 W.mL-1,which means that this combination treatment method reduced the disposal costs of excess sludge conditioning treatment.