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How does the water supply function in DEUS 21?


Rainwater storage
Rainwater storage
Laying the rainwater system
Laying the rainwater system
Membrane filter
Membrane filter

Rainwater, drinking water and utility water

There are many good reasons why the rainwater falling on roofs and other sealed surfaces should be used instead of simply channelling it into sewers. These include flood protection, supplementing groundwater reserves and more efficient wastewater treatment possibilities. In the development plan for the new housing estate "Am Römerweg", it was therefore originally intended for home-owners to construct and operate their own seepage pits on their properties. The drawback of this solution is that it restricts the use of that part of the garden in which the seepage pit is situated.

On the DEUS 21 housing estate, in cooperation with the town of Knittlingen, rainwater is now being handled in a different, but still environmentally-compatible way: Rainwater is collected in a subterranean system of storage pipes and then fed into a modern water treatment plant (based on membrane technology) which purifies it to the standards of the German Drinking Water Ordinance (TVO).

This water can therefore not only be used for washing clothes, flushing the toilet or watering the garden, but also in dishwashers and even for bathing and showering. DEUS 21 therefore calls this water "service water" and not process water.

Since the service water has a very low degree of water hardness, the demand for cleaning agents is reduced. When heating the water, there is no need to add descaling agents and there is no deterioration of the systems, pipes and fittings due to limescale damage. The service water is delivered to the DEUS 21 housing estate via its own supply network which is laid up to the property boundary lines in parallel to the drinking water network. It is then up to the homeowners whether or not to connect their properties to this network and use it for their own selected applications.

In order to be able to use the service water in the buildings now or in the future, it is necessary to plan a second pipeline right from the start in parallel to the drinking water system, even if not all the service water applications are to be exploited at present. Laying additional pipes for new buildings can be managed at low additional cost. These additional costs are offset by the benefits of reducing the consumption of drinking water as well as that of cleaning and descaling agents.

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