Hanovia Ltd - a Halma Company

Evaluation of Inactivation of Cryptosporidium parvum Oocysts in Recreational


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Purpose: To determine the ability of the Hanovia UVP 61 water disinfection system to nactivate Cryptosporidium parvum oocysts suspended in recreational (water park) water.
Methods and materials:
Test water: The water used for this test was from the Adventure Island water park, Tampa, Florida. A 200 gallon (750 L) volume had been  collected on October 24, 1999, and delivered to Clancy Environmental Consultants, Inc. (CEC) in fourteen 15 gal containers, arriving November 4, 1999. The UV transmittance of the water had been previously determined to be 70%.
Test system: The UVP 61, serial number 109903, is a medium pressure UV system consisting of a control/power supply and reactor vessel with one medium pressure lamp, temperature monitor and UV intensity meter.
Test conditions and design: Three flow rates were investigated so as to achieve high, mid-range and low UV doses. Flows of 4.3, 10, and 40 gpm were tested, corresponding to 95, 38, and 10 mJ/cm2, respectively, as displayed on the system control panel, which factored in flow, UV intensity and UV transmittance. Refer to the figure below for the following test set-up description.

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