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Did you know that UV light helps to ensure safe bathing during the summer months?


Communal wastewater, after being cleaned in clarification plants, is reintroduced into the water cycle, into rivers, lakes and coastal waters. Special treatment is necessary if, at subsequent points, drinking water is extracted or wastewater is fed back to bathing waters. If the wastewater has a high germ count then the hygienic conditions for bathing become doubtful as there are significant dangers of infection for humans.

In addition to the conventional processes for cleaning water – such as the use of chemicals like chlorine and ozone or filtration systems – the importance of ultraviolet light as a reliable, environmentally friendly and economically viable alternative is ever increasing.

The city of Munich and the State of Bavaria started a project to improve the hygienic water quality of the Isar, to ensure safe bathing during the summer months. One part of the Isar is diverted into the Isar canal and used for energy generation.

As a result, the remaining Isar between Bad Toelz and Freising carries very little water. By introducing cleaned wastewater from the clarification plants in this area the degree of contamination was high, in spite of sufficient treatment, and the water was heavy with pathogens.

The Europe-wide, unique “Clean Isar” project included the decision to use UV wastewater disinfection as the final cleaning stage in the clarification plants which fed the wastewater back into the river.

The aim was to significantly reduce the germ count of the waste waters and so improve the hygienic water quality of the Isar in the bathing season, while meeting the severe EU bathing water regulations.

Heraeus Noblelight offers different UV solutions for water treatment.

The disinfection of water can involve the use of compact medium pressure UV lamps, low pressure UV lamps and high power amalgam lamps.

Follow the link, if you would like to read details about the different UV lamp technolgies for water treatment 

Are you interested in details about the project: “Clean Isar – a decision for UV”? Please contact us at

Heraeus Noblelight GmbH
Heraeusstr. 12-14
D-63450 Hanau

Phone +49 6181 35 8539
Fax +49 6181 35 16 8539

Dr. Marie-Luise Bopp | Heraeus Noblelight GmbH
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