Hartong Bradley H, Abu-Daabes Malyuba, Le Tuan, Saidan Motasem, Banerjee Sujit
Institute of Paper Science and Technology, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0620, USA.
Water Res. 2007 Mar;41(6):1201-6. doi: 10.1016/j.watres.2006.12.011. Epub 2007 Jan 30.
Cyclodextrins (CDs) increase the cake solids and drainage rate of belt-pressed biological or primary sludge when added to the sludge slurry along with conventional conditioning chemicals. These benefits are obtained at very low CD dosage. A 2.8 percentage point increase in cake solids was obtained in a full-scale trial with mixed primary and biological sludge from a paper mill. CDs also decrease the specific resistance to filtration and increase the capture rate of solids during belt pressing. Mechanistic studies showed that CDs increase the surface tension of c-PAM polymers in water and reduce the turbidity, indicating that they are able to aggregate the charged polymers, and, by inference, sludge particles treated with the polymer. A mechanism is proposed where CDs reduce excessively charged regions of the polymer-treated surface of the sludge, thereby facilitating its flocculation.
当环糊精（CDs）与传统调理化学品一起添加到污泥浆中时，可提高带式压滤生物污泥或初沉污泥的滤饼固体含量和排水速率。在非常低的CD用量下就能获得这些益处。在一项针对造纸厂混合初沉污泥和生物污泥的全尺寸试验中，滤饼固体含量提高了2.8个百分点。CDs还降低了过滤比阻，并提高了带式压滤过程中固体的捕获率。机理研究表明，CDs提高了水中阳离子聚丙烯酰胺（c-PAM）聚合物的表面张力并降低了浊度，这表明它们能够使带电聚合物聚集，由此推断，也能使经该聚合物处理的污泥颗粒聚集。提出了一种机理，即CDs减少了聚合物处理的污泥表面过度带电的区域，从而促进其絮凝。
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