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Tuesday, April 23, 2019

The Microbiology of Anaerobic Digesters


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Description
Completely mixed anaerobic digesters are the most commonly used treatment system in North America for the degradation of municipal sludges. Although these suspended-growth systems are not used as commonly at industrial wastewater treatment plants, more and more industrial plants are using fixed-film anaerobic digesters for the treatment of soluble organic compounds in their wastewaters.

Anaerobic digesters perform most of the degradation of organic compounds at wastewater treatment plants. However, digesters often experience operational problems that result in process upsets and increased operational costs. Examples of process upsets and operational problems include foam and scum production, decanting and dewatering difficulties, loss of treatment efficiency, toxic upsets, and “souring” of the digester. Poorly operating anaerobic digesters often contribute to operational problems in other treatment units such as the activated sludge process, gravity thickener, clarifiers, and sludge dewatering facilities.

Because of the importance of anaerobic digesters in wastewater treatment processes, a review of the microbiology of the bacteria and the operational conditions that affect their activity is of value in addressing successful and cost-effective operation. This book provides an in-depth review of the bacteria, their activity, and the operational conditions that affect anaerobic digester performance. The identification of operational problems and troubleshooting and corrective measures for process control are presented.

Content:-
Preface
PART IS: OVERVIEW
1. Introduction
2. Bacteria
3. Methane-forming Bacteria
4. Respiration
5. Anaerobic Food Chain
6. Fermentation
7. Anaerobic Digestion Stages
PART II: SUBSTRATES, PRODUCTS, AND BIOGAS
8. Substrates and Products
9. Biogas
PART III: OPERATIONAL CONDITIONS
10. Introduction to Operational Conditions
11. Start-up
12. Sludge Feed
13. Retention Times
14. Temperature
15. Nutrients
16. Alkalinity and pH
17. Toxicity
18. Mixing
PART IV: PROCESS CONTROL AND TROUBLESHOOTING
19 .Upsets and Unstable Digesters
20. Foam and Scum Production and Accumulation
21. Supernatant 
22. Monitoring
PART V: DIGESTERS
23. Types of Anaerobic Digesters
24. Anaerobic Digesters versus Aerobic Digesters
References
Abbreviations and Acronyms
Chemical Compounds and Elements
Glossary
Index

Author Details
"Michael H. Gerardi"




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