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Troubleshooting Activated Sludge Secondary Clarifier Performance With Simple Diagnostic Tests
Author: Eric J. Wahlberg, Douglas T. Merrill, Denny S. Parker
Date: 10/95
Presented at Water Environment Federation 68th Annual Conference & Exposition Miami Beach, Florida, October 23, 1995

Both mixed liquor flocculation and secondary clarifier shot-circuiting problems result in elevated suspended solids concentrations in activated sludge secondary effluents. Because corrective actions differ, it is important to identify which of these problems is causing high effluent suspended solids. A testing procedure, using the dispersed suspended solids and the flocculated suspended solids tests, is presented to distinguish between these problems. Three in-plant examples are given.