Removal of bacteria


In order to measure the amount of bacteria in drinking water, the bacterial count is analyzed. This means the total number of bacteria found by culturing at 22°C and 37°C respectively. At 22°C, there are bacteria which normally do not cause a disease. The bacterial count at 37°C indicates alien bacteria which often cause diseases. Thus, this count needs to be low. Micro-biological growth which is found in drinking water can consist of among other things bacteria, virus, algae, and fungus.


The bacteria can be effectively limited by ultraviolet light because micro-organisms are very sensitive to UV light. With a wavelength of 254 nm (nanometer), the UV light kills the bacteria, virus, algae, and fungus by breaking down the DNA of the micro-organisms. Disinfection by UV light can be used for almost all water types.

UV disinfection plant with a flow rate of 108 m³/h.

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