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BWT water treatment for the
new Klagenfurt clinic

Clinic at Klagenfurt am Wörthersee


In early May 2010 the Klagenfurt am Wörthersee clinic was formally opened after a 4-year building programme. The clinic was completed in three construction phases and is one of Europe’s most advanced centres of healthcare with the highest quality standards. BWT also ensured that the water treatment for the clinic was of the best possible quality and could be operated with maximum energy efficiency.


New water treatment system for the Klagenfurt clinic

The renovation and expansion of the LKH Klagenfurt became necessary, as the pre-existing building could no longer guarantee efficient running of the hospital. The new supply and waste water centre (VEZ), which would house the entire water treatment system for the new building, was completed during the second phase of construction. Water for the clinic’s new building is supplied from a spring with a high mineral content.


Softening plant and UV disinfection for untreated water and water for processing

Three volume-controlled, soft water pendulum systems from the BA 800 MD-MHV range (capacity: 3 x 50 m3/h) were installed to soften the drinking water. These systems operate in ‘pendulum’ or alternating mode, which ensures a constant supply of soft water, even at times of peak demand, and guarantees maximum protection from limescale deposits in the water conduit systems.


In a second stage, softened drinking water is produced with a residual hardness of <0.1° dH and reduced levels of pathogenic bacteria, using the BWT Bewades UV disinfection system with no added chemicals. Automatic blending equipment uses a volume-proportional mixing process to blend the softened water with filtered drinking water for various applications and at different hardness grades: laundries and recycling collection centre (2–3° dH),  hot water for the surgical/medical centre and for the supply and waste water centre (7–8° dH).


Pure water for the medical section

Additional water treatment for producing pure water uses BWT’s reverse osmosis system. With this method, the water is desalinated via two dual-stage (permeate-graded) reverse osmosis alternating-mode systems from the BRO range (capacity: 2 x 10 m3/h) up to a residual salt content of < 15 µS/cm, which ensures uniform use of the system capacity. The pure water (permeate) is subsequently produced via demand-driven pumps, energy-optimised for use in the kitchens, the ‘Chirurgie Ost‘ (East Surgery) central sterilised equipment supply division, and for pure-steam applications. In a further downstream treatment stage using electric deionisation (EDI), the water is desalinated again via two alternating-mode systems from the SEPTRON Line 100 range up to a residual salt content of <5 µS/cm. This highly desalinated water (diluate) is then distributed for use in steam sterilisation, for an emergency supply and an electro-steam generator.


The entire water treatment plant can be operated via programmable controls using BWT’s EMSR technology. Modern touchscreen interfaces make the system easy to operate and enable its most critical functions to be monitored.


The project


Kärnten District, Landeskrankenanstalten-Betriebsgesellschaft – KABEG of the Kärnten District

Technical structural design (HVAC) Design of water treatment:

Dipl.-Ing. Wagner/Graz, ZFG Project Planning and Consultancy (Projekt Planungs- und Beratungs) GmbH


Fa. Ortner/Innsbruck, Fa. Hechenleitner & Cie GmbH/Klagenfurt Implementation of water treatment plant: 

BWT Austria GmbH/Mondsee, Buildings and Industry Technology Division (Geschäftsbereich Gebäude- und Industrietechnik)


BWT Septron Line 100/ EDI

Desalination system




Softening system



BWT BRO 11000/10000

Reverse osmosis system



Control with touch panel
BWT Septron Line 100