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Fundamentals of Wastewater Treatment and Engineering
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Table of Contents

Sustainable Wastewater Treatment and Engineering
Introduction and history
Current practice
Emerging issues
Future directions
Regulatory requirements
References

Reaction Kinetics and Chemical Reactors
Reaction kinetics
How to find the order of a reaction
Zero order reaction
First order reaction
Second order reaction
Reactors
Batch reactor
Continuous-flow stirred tank reactor
Reactors in series
Semibatch or semiflow reactors
Problems
References

Wastewater Microbiology
Introduction
Bacteria
Archaea
Protozoa
Algae
Fungi
Virus
Problems
References

Natural Purification Processes
Impurities in water
Dilution
Sedimentation
Microbial degradation
Measurement of organic matter
Dissolved oxygen balance
Problems
References

Wastewater Treatment Fundamentals
Introduction
Sources of wastewater
Wastewater constituents
Wastewater treatment methods
Levels of wastewater treatment
Residuals and biosolids management
Flow diagrams of treatment options
Types of biological treatment processes
Problems
References

Preliminary Treatment
Introduction
Screens
Shredder/grinder
Grit chamber
Problems
References

Primary Treatment
Introduction
Types of settling/sedimentation
Type I sedimentation
Type II sedimentation
Primary sedimentation
Chemically enhanced primary treatment
Problems
References

Secondary Treatment: Suspended Growth Processes
Introduction
Microbial growth kinetics
Activated sludge process (for BOD removal)
Modeling suspended growth processes
Types of suspended growth processes
Stabilization ponds and lagoons
Problems
References

Secondary Treatment: Attached Growth and Combined Processes
Introduction
System microbiology and biofilms
Important media characteristics
Loading rates
Stone media trickling filter
Biotower
Rotating biological contactor
Hybrid processes
Combined processes
Problems
References

Secondary Clarification
Introduction
Secondary clarifier for attached growth process
Secondary clarifier for suspended growth process
Problems
References

Anaerobic Wastewater Treatment
Introduction
Process chemistry and microbiology
Methanogenic bacteria
Sulfate-reducing bacteria
Environmental requirements and toxicity
Methane gas production
Anaerobic growth kinetics
Anaerobic suspended growth processes
Anaerobic attached growth processes
Hybrid processes
Problems
References

Solids Processing and Disposal
Introduction
Characteristics of municipal sludge
Sludge quantification
Sludge thickening
Sludge stabilization
Conditioning of biosolids
Biosolids dewatering
Disposal of biosolids
Biosolids disposal regulations in the United States
Problems
References

Advanced Treatment Processes
Introduction
Nitrogen removal
Phosphorus removal
Solids removal
Problems
References

Appendix

Index

About the Author

Dr. Rumana Riffat is a professor in the Civil and Environmental Engineering Department at George Washington University in Washington, D.C. Her research interests are in wastewater treatment, specifically anaerobic treatment of wastewater and biosolids, as well as nutrient removal. She and her research group have conducted extensive research on processes to further reduce pathogens, such as dual digestion, temperature-phased digestion, and various pretreatment options. Her nutrient removal research has focused on determination of kinetics and evaluation of various external carbon sources for denitrification. Dr. Riffat received the Distinguished Teacher Award from the School of Engineering and Applied Science of George Washington University in 2011 and the George Bradley Gascoigne Wastewater Treatment Plant Operational Improvement Medal of the Water Environment Federation (WEF) in 2010. She is a member of several professional organizations, including WEF and the ASCE, and is a registered professional engineer of the District of Columbia.

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