Penn State » Outreach »  Wastewater Biology » Course Descriptions » Settleability Problems and Loss of Solids

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Settleability Problems and Loss of Solids--3 hours, 0.3 CEU

Settleability Problems and Loss of Solids reviews the operational conditions responsible for poor compaction of secondary solids and loss of solids from secondary clarifiers in activated sludge processes. Operational conditions reviewed include

1. filamentous growth
   
2. nutrient deficiency
   
3. denitrification
   
4. sheared floc
   
5. dispersed floc
   
6. excess heavy metals
   
7. significant increase in MLVSS
   
8. low dissolved oxygen and the interruption of proper floc formation
   
9. slug discharge of soluble cBOD
   
10. hydrous or colloidal floc
    
11. young sludge age
    
12. zoogloeal growth
    
13. scum production
    
14. floc particles loss through sludge aging
    

In addition, the course covers identification of biological, chemical, and physical foams, as well as the use of settleability testing.

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