Batch Settling of Flocculated Clay Slurry

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• 作者：C. P. Chu ; S. P. Ju ; D. J. Lee ; F. M. Tiller ; K. K. Mohanty ; and Y. C. Chang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2002
• 出版时间：March 6, 2002
• 年：2002
• 卷：41
• 期：5
• 页码：1227 - 1233
• 全文大小：93K
• 年卷期：v.41,no.5(March 6, 2002)
• ISSN：1520-5045

文摘

This study employs a computerized axial tomography scanner (CATSCAN) to measure thespatiotemporal distributions of solidosity for a clay slurry flocculated with a cationic polyelectrolyte. Flocculation produces fast-settling sediment and a clear supernatant. Limited datarevealed the finite role of sludge plasticity on rheological characteristics. However, owing to thedeterioration of the sludge network structure during settling, the purely elastic constitutiveequations properly interpreted the final sediment data. The null-stress solidosity was estimatedusing three different methods. Polyelectrolyte flocculation renders a low attainable solidosityat the settler bottom, the low null-stress solidosity, and a less-compressible sediment. Most ofthe sedimentation processes considering well-flocculated slurries is governed by sedimentationcompaction. The solid flux in the sediment is not a unique function of solidosity.