Title

Specifying and monitoring ultraviolet systems for effective disinfection of water

Authors

J D. Caufield

Publication Date

1991

Notes

ISBN 0-913235-72-5

Publication Title

Fisheries Bioengineering Symposium: American Fisheries Society Symposium 10

Start Page

421

End Page

426

Editors

Colt J;White RJ;

Publication Place

Bethesda, MD

Publisher

American Fisheries Society

Abstract

The operational characteristics to be identified in a specification for an ultraviolet disinfection unit include water flow rate, temperature, radiation absorption coefficient, and minimum radiation dosage level. Material, equipment, and monitoring requirements also need to be stated. Minimum dosage required to treat water for fish culture is usually taken as 33,000 m W/s/cm2, unless there is reason to guard against a more resistant pathogen. Absorption of ultraviolet radiation by water is a seasonal variable because of changes in color and turbidity. A year of testing the water to be treated is recommended to determine the maximum absorption coefficient. In response to these specifications, suppliers can submit technical data on specific disinfection units whose effectiveness can then be tested by mathematical analysis. Relatively complex formulas have been reduced to a family of curves that can be used to accomplish this analysis by simple arithmetic summation.

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