Gerardi Settleability Problems and Loss of Solids in the Activated Sludge Process

1. Auflage 2003
ISBN: 978-0-471-27274-8
Verlag: John Wiley & Sons
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, Band 1, 192 Seiten, E-Book

Reihe: Wastewater Microbiology

The activated sludge process is the most versatile, commonly usedwastewater treatment system in North America; however, manyactivated sludge processes frequently experience operationalproblems related to poor compaction or settleability of secondarysolids and loss of secondary solids from the clarifier. Eschewingthe technical jargon and copious chemical equations found in themajority of wastewater studies, Settleability Problems andLoss of Solids in the Activated Sludge Process speaksdirectly to plant operators, showing them how to identify and solvecommon problems and achieve maximum efficiency.
Michael H. Gerardi's hands-on guide addresses the mostcommon plant operational problems, such as increased costs, loss oftreatment efficiency, and permit violations. Using numerous tablesand illustrations, Settleability Problems provides microscopic andanalytical techniques for troubleshooting and identifying theconditions responsible for settleability problems and loss ofsolids. It includes pictures of wet mounts and smears of acceptableand unacceptable microscopic conditions of the activated sludge andpresents corrective measures for operational problems. Chaptersinclude:
* Undesired Filamentous Growth
* Nutrient-Deficient Floc Particles
* Denitrification
* Slug Discharge of Soluble cBOD
* Viscous Bulking or Zoogloeal Growth
* Production and Accumulation of Foam and Scum
Volume II in the series, Settleability Problems will prove to beof unparalleled value to wastewater treatment plant operators aswell as students of wastewater microbiology.

Autoren/Hrsg.

Gerardi, Michael H.

Inhaltsverzeichnis

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.

Über Autor(innen)

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.