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Settleability Problems and Loss of Solids in the Activated Sludge Process
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Table of Contents

Preface. PART I: OVERVIEW. The Activated Sludge Process. Floc Formation. A Floc Formation Model. Interruption of Floc Formation. PART II: SETTLEABILITY PROBLEMS AND LOSS OF SOLIDS. Introduction. Undesired Filamentous Growth. Nutrient-Deficient Floc Particles. Denitrification. Sheared Floc Particles. Dispersed Floc Particles. Heavy Metals and Congealed Floc Particles. Low Dissolved Oxygen Concentration. Young Sludge Age. Floc Particles Lost Through Sludge Aging. Slug Discharge of Soluble cBOD. Viscous Bulking or Zoogloeal Growth. Increase in Percent MLVSS. Colloidal Floc Particles. Temperature. PART III: FOAM AND SCUM. Production and Accumulation of Foam and Scum. Identification of Foam. Controlling Foam Production and Accumulation. PART IV: SETTLEABILITY TESTING. Settleability Testing and Settling Rate. Settleability Testing: Microscopic Analyses. Appendix I: F/M, HRT, MCRT, MLVSS, Sludge Age, SVI. Appendix II: Microscopic Techniques. References. Abbreviations and Acronyms. Chemical Compounds and Elements. Glossary. Index.

About the Author

MICHAEL H. GERARDI, MS, James Madison University, and currently a research project associate at The Pennsylvania State University, is responsible for the development and presentation of wastewater biology courses. Previous to this appointment, he served as a technical coordinator and manager for the Williamsport (Pennsylvania) Sanitary Authority, where he was responsible for the operational and administrative functions of two activated sludge plants.

Reviews

"...All in all it is an excellent example of applied and troubleshooting microbiology." (Microbiology Today, August 2003)

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