微波联合PAM对污泥脱水性能的影响

Effect of microwave and polyacrylamide on sludge dewaterability

摘要:

为提高剩余污泥脱水性能,降低絮凝剂投加量,采用某城市污水厂剩余污泥为研究对象,研究微波预处理技术联合聚丙烯酰胺（PAM）对污泥脱水性能的影响,分析不同微波加载时间和PAM投加量对污泥毛细吸水时间（tcs）、污泥比阻以及离心后污泥含水率的影响及相关机理．结果表明,适宜的联用条件对污泥脱水效果优于仅PAM调理,污泥tcs、离心后含水率及污泥比阻分别由仅PAM调理的37.3 s、83.68％、1.72×10⁹ s²·g-1降至16.7 s、78.16％、0.35×10⁹ s²·g-1,且PAM投加量节省33％左右．适宜的微波与PAM联用对污泥的脱水性能有明显改善．

Abstract:

To improve the dewaterability of residual sludge and increase the dosage of flocculant, the residual sludge from one sewage treatment plant was studied by analyzing the impact of combination of microwave pretreatment technology and PAM on the sludge dewawtering. The results showed that proper coupling technique could improve the effect of sludge dewatering considerably compared to PAM. There was significantly decrease in the value of sludge’s tcs, sludge’s water content after centrifugation and sludge’s specific resistance, from 37.3 s,83.68％,1.72×10⁹ s²·g-1 (only by PAM) to 16.7 s,78.16％,0.35×10⁹ s²·g-1, and the dosage of PAM reduced by about 33％. Appropriate combination of microwave and PAM could improve the sludge dewatering significantly.