Transcription of Activated Sludge Microbiology Problems and Their Control
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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.
Hydrogen sulfide toxicity is highly pH dependent, due to the H2S form being the toxic agent and not HS-. The pKa for H2S is 7.0, indicating higher toxicity at a pH of 7 or less when H2S is ... Control of denitrification is either by control of nitrification (reduced sludge age or reduced
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