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Influence of Improving Sludge Dewatering Conditions on CST
  
DOI：10.11980/j.issn.0254-508X.2013.11.009
Key Words:CST  dewater ability  flocculants  wastewater
Author NameAffiliation
赵骏衡1 1.江原大学校山林环境科学大学造纸工学科，韩国春川，200-701 
金海兰2,* 2.东北林业大学生物质材料科学与技术教育部重点实验室, 黑龙江哈尔滨，150040 
李　坚2 2.东北林业大学生物质材料科学与技术教育部重点实验室, 黑龙江哈尔滨，150040 
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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.
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