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Activated Sludge Microbiology Problems and Their Control

1 Presented at the 20th Annual USEPA National Operator Trainers Conference Buffalo, NY, June 8, 2003. Activated Sludge Microbiology Problems AND Their Control Michael Richard, Sear-Brown Fort Collins, CO CONTENTS I. Introduction II. Microbiology Problems and Their Causes 1. Poor Floc Formation, Pin Floc and Dispersed Growth Problems 2. Toxicity 3. Nitrification and Denitrification Problems 4. Nutrient Deficiency and Polysaccharide Bulking and Foaming 5. Zoogloeal Bulking and Foaming 6. Filamentous Bulking 7. Filamentous Foaming III. Practical Control methods for Filamentous Bulking and Foaming 1. Short Term Control methods a. Sludge Juggling b.

is microbiological in nature. These methods are easy, fast and inexpensive compared to other approaches, and are generally understandable and accepted. MICROBIOLOGY PROBLEMS AND THEIR CAUSES Poor Floc Formation, Pin Floc and Dispersed Growth Problems Basic floc formation, required for activated sludge operation due to the use of gravity clarifiers,

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