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About the Authors| The late Clair N. Sawyer was active in the field of sanitary chemistry for over 30
years. He received a Ph.D. from the University of Wisconsin. As Professor of Sani-tary
Chemistry at the Massachusetts Institute of Technology, he taught and directed
research until 1958. He then was appointed Vice President and Director of Research
at Metcalf and Eddy, Inc., and served as consultant on numerous water and waste-water
treatment projects in the United States and many foreign countries. After re-tiring,
he served as an environmental consultant for several years. He passed away
in 1992. He was the originator and sole author of the first edition, which was pub-lished
in 1960.Perry L. McCarty is the Silas H. Palmer Professor Emeritus of civil and environ-mental
engineering at Stanford University. He received a B.S. degree in civil engi-neering
from Wayne State University and S.M. and Sc.D. degrees in sanitary engi-neering
from the Massachusetts Institute of Technology, where he taught for four
years. In 1962 he joined the faculty at Stanford University. His research has been
directed towards the application of biological processes for the solution of environ-mental
problems. He is an honorary member of the American Water Works Associ-ation
and the Water Environment Federation, and Fellow in the American Academy
of Arts and Sciences, the American Association for the Advancement of Science,
and the American Academy of Microbiology. He was elected to the National Acad-emy
of Engineering in 1977. He received the Tyler Prize for environmental
achievement in 1992 and the Clarke Prize for outstanding achievement in water sci-ence
and technology in 1997.Gene F. Parkin is a Professor of Civil and Environmental Engineering at the Uni-versity
of Iowa, and Director of the Center for Health Effects of Environmental
Contamination. He received a B.S. degree in civil engineering and an M.S. degree
in sanitary engineering from the University of Iowa and a Ph.D. degree in environ-mental
engineering from Stanford University. He taught at Drexel University for
eight years before joining the faculty at the University of Iowa in 1986. His teach-ing
interests have been in biological treatment processes and environmental chem-istry.
His research has been directed toward anaerobic biological processes and
bioremediation of waters contaminated with organic chemicals. He has received the
J. James R. Croes Medal from the American Society of Civil Engineers and the
Harrison Prescott Eddy Medal from the Water Environment Federation. In 1989 he
received the Hancher-Finkbine Medallion from the University of Iowa for outstand-ing
teaching and leadership and in 1999 he received a state of Iowa Board of Re-gents
Award for Faculty Excellence.
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2003 McGraw-Hill Higher Education