改善造纸污泥脱水性条件对CST的影响

Influence of Improving Sludge Dewatering Conditions on CST

关键词:  CST值  脱水性  絮凝剂  造纸污泥

Key Words:CST  dewater ability  flocculants  wastewater

摘要:研究了改善造纸污泥脱水性条件对毛细管吸水时间（CST）的影响，结果表明，先进行300 r/min、10 min的急速搅拌，再进行50 r/min、15 min缓慢搅拌时，造纸污泥的脱水性最佳。提高废水温度，废水黏度降低，CST值也逐渐减小；pH值约为7时，CST值最低，说明中性条件可改善造纸污泥的脱水性能；高分子絮凝剂对CST值的影响表明，阳离子聚丙烯酰胺（CPAM）对提高造纸污泥脱水性优于阴离子聚丙烯酰胺（APAM）。

Abstract:CST (Capillary Suction Time) can quickly and accurately evaluate the dewatering performance of sludge. The dewatering performance of papermaking wastewater sludge was evaluated by using CST method in this study. CST values can be obtained in the tens of seconds, it can accurately reflect the sludge dewatering performance, and also can be used to determine the optimal dosage of flocculent. CST results showed that the wastewater solids had the best dewatering performance when it was rapidly stirred in 300 r/min for 10 min at first, then slowly stirred in 50 r/min for 15 min. CST values were gradually reduced with temperature increasing and viscosity decreasing; CST value was low while pH values was in 7, indicating neutral conditions probably could improve sludge dewatering performance. On the other hand CPAM was more effective than APAM for improving sludge dewatering.