Water is used in a variety of ways: we need it as drinking water, we use it for hygiene and swimming, we use it for transport and irrigation, and also as process water in almost every kind of industrial production.
This wide range of applications results in very different requirements which have to be met in terms of water quality – and therefore also in terms of water treatment. Gases help produce clean drinking water, supply optimal process water and thoroughly clean even heavily contaminated wastewater.
Gases have been used in large-scale water treatment for over a century. The earliest example of this is the disinfection of drinking water with chlorine gas*. Modern treatment processes now largely avoid the use of toxic or corrosive chemicals. Increasing use is being made of two gases that are also part of the natural water cycle: oxygen and carbon dioxide.
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