A public surface drinking water system (DWS) located in Alberta operates two level 2 drinking water treatment plants, one level 3 drinking water treatment plant and three drinking water storage systems. The DWS used both a membrane-covered amperometric sensor and an on-line colorimetric sensor to control and monitor free chlorine residual levels in their drinking water systems.
Both analyzer systems required significant preventative maintenance, the need for replacements parts, and the purchase of consumables. The DWS was also concerned that the measurements of the membrane-covered amperometric sensor would be influenced by bubbles, which occurred frequently in their system.
While both analyzers were able to stay in the residual target range, the Krypton® Multi system had on average less deviation from the reference measurements providing more accurate readings.
ClearTech suggested the installations of Kuntze Krypton® Multi analyzers to measure and control the disinfectant residuals. The DWS agreed to trial the Kuntze analyzer and installed it at the distribution system header right next to the existing membrane sensor. The Krypton® Multi system also featured Kuntze’s patented ASR® automatic sensor cleaning technology, which was set-up for automatic cleaning once per week to prevent the sensor from fouling. The membrane sensor of the competitive system was manually cleaned once per month.
The trial was conducted for one month in September 2020. The operators used a handheld colorimeter taking manual DPD reference measurements five days per week. The free chlorine residual target range was 1.0 to 1.5 ppm, and the reference measurements were compared with the readings of both the Krypton® Multi system and the analyzer with the membrane sensor.
The Kuntze Krypton® Multi system became the preferred technology to monitor and control the free chlorine residuals while significantly reducing the preventative maintenance requirements. The Krypton® Multi system requires no consumables or reagents generating significant cost savings for the drinking water system.
Recently the DWS replaced two on-line colorimetric analyzers with two Kuntze Krypton® DIS analyzers at one of their 750 cubic meter storage tanks to measure the free chlorine residuals at the inlet and discharge points. The DWS reported following reasons for their decision:
Replacing the two on-line colorimetric analyzers with the two Kuntze Krypton® DIS analyzers has generated total savings of $16,350 per year.