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DOES RHEOLOGY RESTRICT THE SECONDARY SETTLER CAPACITY?

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Abstract:

Consideration of sludge rheology is very important for a proper solids transport and to obtain the necessary settler capacity. Although a true yield stress does not exist, large apparent viscosities at low shear rates inhibit an efficient sludge transport. Research indicates that the dimensionless ratio of gravity to viscous forces is an important operational parameter towards settler capacity. To improve solids transport scraper mechanisms are utilized that introduce extra shear to (i) overcome the pseudo-yield stress and (ii) liquefy the sludge.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864704784138278

Publication date: January 1, 2004

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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