Drinking water disinfection - that's the easiest way

If the drinking water is probably or relatively safely germinated, it must be disinfected. There are different methods for this. What is possible and what advantages and disadvantages the individual methods have is explained here.

Classic method

The classic method for complete sterilization of drinking water and killing all bacteria is boiling.

If water boils for at least 3 minutes, it is certainly completely germ-free. The method is complex and costs energy. In addition, it can only be used for water that is consumed immediately in small quantities.

When disinfecting water pipes, the method of increasing the temperature is also referred to as thermal disinfection. However, lower water temperatures are used. Legionella control works with around 70° C water temperature.

Use of UV light

The dangerous UV light in certain wavelengths kills living microorganisms within fractions of a second. UV disinfection is thus a very effective, cost-effective and universally applicable method for the complete disinfection of water. Smell and taste are not changed.

In addition, special wavelengths of light are used for the rapid inactivation of viruses. Individual wavelengths of light have a particularly protein-damaging effect and could possibly also be suitable for destroying the previously difficult to control prions.

UV disinfection systems are available as flow systems for the household and also for larger commercial facilities. They contain mercury vapor lamps, which work consistently energy-efficient.

Small units can handle flow rates of around 4 m³ per hour, but large units can certainly deliver outputs of 500 m³ / h or more. Portable devices work with batteries and are no larger than a pen (Steripen).

Chemical disinfection

The addition of certain chemicals in the water also allows sterilization of the drinking water. The problem here is, however, that the added chemicals remain in the water, and change the smell and taste.

In addition, many pathogens, even spores are basically resistant to individual chemicals, some pathogens can also "submerge" in an existing biofilm and thus escape the disinfection.

Tips & Tricks

UV disinfection is a very simple, cost effective and even portable way to reliably rid water of all microorganisms, bacteria, viruses and spores.

Video Board: 3 Simple Ways To Disinfect Water