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Sign upMay 1, 2022
The Municipality of Saxon
Saxon
In recent years, the Swiss municipality of Saxon faced heavy bacteriological contamination of its spring water, particularly during heavy rainfall and snowmelt. Collaborating with engineering firm PMAX, they installed the BactoSense fully automated monitoring and control system. This innovative system integrates modern measurement technology, chlorine pumps, and shut-off valves to ensure high-quality water supply. Based on rain event detection and flow cytometry, it enables real-time selective alerts to villages in case of contamination risks in their supply area.
The entire microbiological contamination risk management system operates with low power consumption, using only a few hundred watts, which translates to a cost of approximately 4 to 5 cents per cubic meter. Additionally, chlorine usage was significantly reduced in 2022, with only 3.5 kg of chlorine consumed. In comparison, continuous chlorination would have required around 129 kg of chlorine, demonstrating a major reduction in chemical use and further enhancing cost efficiency.
The actual situation in terms of microbial contamination detection on drinking water plants is very slow and not reliable. First, the actual method takes 2-3 days to show any abnormal situation, time where population will get sick. Secondly, the actual procedure identify only a small percentage of bacteria (1-5%) as not all bacteria are able to growth on a dry nutrient support. The whole procedure requires 50 gr of plastic of lab consumable. The BactoSense device detects automatically in less than 30 min all bacteria in water directly coming from the process via a single sampling tube. When placed at the entry of the plant, the device acts as an early warning system in case of abnormal microbial conditions. When placed in other locations, process optimization can be generated with potential reductions of chlorine, impacting positively tap water acceptance and bottled water consumption (EU major initiative). On a 10 years basis, 1000 kg of plastic consumption and more than 3 to of CO2 can be avoided.
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