Settleability Problems and Loss of Solids in the Activated Sludge Process

Settleability Problems and Loss of Solids in the Activated Sludge Process

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Description

The activated sludge process is the most versatile, commonly used wastewater treatment system in North America; however, many activated sludge processes frequently experience operational problems related to poor compaction or settleability of secondary solids and loss of secondary solids from the clarifier. Eschewing the technical jargon and copious chemical equations found in the majority of wastewater studies,
Settleability Problems and Loss of Solids in the Activated Sludge Process speaks directly to plant operators, showing them how to identify and solve common problems and achieve maximum efficiency.
Michael H. Gerardi s hands-on guide addresses the most common plant operational problems, such as increased costs, loss of treatment efficiency, and permit violations. Using numerous tables and illustrations, Settleability Problems provides microscopic and analytical techniques for troubleshooting and identifying the conditions responsible for settleability problems and loss of solids. It includes pictures of wet mounts and smears of acceptable and unacceptable microscopic conditions of the activated sludge and presents corrective measures for operational problems. Chapters include:




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 be of unparalleled value to wastewater treatment plant operators as well as students of wastewater microbiology.
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Product details

  • Paperback | 192 pages
  • 174 x 252 x 14mm | 358.34g
  • John Wiley & Sons Inc
  • New York, United States
  • English
  • 1. Auflage
  • 0471206946
  • 9780471206941
  • 1,113,344

Back cover copy

Volume II of the definitive series on the microbiology ofwastewater treatment

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 and Loss ofSolids in the Activated Sludge Process speaks directly to plantoperators, showing them how to identify and solve common problemsand achieve maximum efficiency.

Michael H. Gerardi's hands-on guide addresses the most common plantoperational problems, such as increased costs, loss of treatmentefficiency, and permit violations. Using numerous tables andillustrations, 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

The Wastewater Microbiology Series tackles the critical topics ofcost-effective operation, permit compliance, process control, andtroubleshooting through a microbiological perspective. Volume II inthe series, Settleability Problems will prove to be of unparalleledvalue to wastewater treatment plant operators as well as studentsof wastewater microbiology.
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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.
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Review Text

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

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

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.
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