Ozone
Why Test Test for ozone levels being delivered by the ozone generator. Maintain ozone levels to optimize the treatment process to reduce taste and odor problems, reduce disinfection byproduct formation, provide pathogen inactivation and to facilitate removal of iron and manganese. Determine ozone concentrations to calculate CT credits.
Method |
Use Model |
Product |
Colorimetric - Indigo |
Lab |
DR 6000 & DR 3900 |
Colorimetric - Indigo |
Portable |
DR 900 |
Chlorine Dioxide
Why Test Test for chlorine dioxide levels being delivered by the chlorine dioxide generator. Maintain chlorine dioxide levels to optimize the treatment process to reduce taste and odor problems, reduce disinfection byproduct formation, provide pathogen inactivation and to facilitate removal of iron and manganese. Determine chlorine dioxide concentration to calculate CT credits for Giardia and virus inactivation.
Method |
Use Model |
Product |
Colorimetric - DPD/Glycine |
Lab |
DR 6000 & DR 3900 |
Colorimetric - DPD/Glycine |
Portable |
DR 900 |
Chlorite
Why Test? Chlorine dioxide produces chlorite as a byproduct of the production process. Chlorite is a regulated parameter and must be monitored.
UV254
Why Test? UV-254 is a measurement of the UV absorbing organic constituents at the 254 nm wavelength. This measurement has shown to be a good indicator of the amount of organic material present that is likely to react with chlorine to form disinfection byproducts. The method uses no reagents and requires an instrument capable of measuring at 254 nm. The method is best used with surface waters like large reservoirs or lakes that have a relatively stable organic level. A change in the UV 254 absorbance value can indicate changes in water quality that may impact the disinfection process. Storm events, algal blooms or reservoir turnover would be examples of events that could impact the UV-254 value and the subsequent treatment process. The UV-254 measurement is made following sample filtration through a 0.45 micron filter. The UV-254 value is also used in the calculation of SUVA which is used to determine compliance for reducing DBP precursor material under the Disinfectants and Disinfection Byproduct Rule.