Specifying and monitoring ultraviolet systems for effective disinfection of water
Fisheries Bioengineering Symposium: American Fisheries Society Symposium 10
Colt J;White RJ;
American Fisheries Society
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.