Mixed up About TWAS? TWAS can be much harder to mix than primary sludge, leading to disappointment and redesign. Computer simulation combined with a viscous sludge fluid model came to the rescue. By Jeff McCormick, Carollo Engineers; Richard Bishop, CH2M Hill Engineers; John Peterson, Clark Regional Wastewater District; and Glenn Dorsch and Marilyn Pine, both of Vaughan Company, Inc. The Vaughan Rotamix ® mixing system for the

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