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The concept

The DEUS 21 - concept comprises several components

Rainwater and Servicewater
Wastewater collection and treatment
Kitchen waste

Rainwater and service water

Das Trinkwasser wird erstens aus dem Grundwasser gewonnen und zweitens aus Regenwasser. Häusliches so wie Straßenabwasser wird versickert und wieder neu genutzt.

There are very good reasons why it is much better to utilise rainwater and permit natural seepage than to channel it into sewers. These include flood protection, supplementing groundwater reserves and more efficient treatment possibilities for wastewater. In the development plan of the new housing estate "Am Römerweg" it was therefore originally intended that homeowners should construct and operate seepage pits on their properties.
Within the scope of the DEUS 21 project and in cooperation with the town of Knittlingen, rainwater is now being dealt with in a different environmentally-compatible way: Rainwater falling on the estate is collected in a subterranean system of storage sewers and fed into a modern membrane plant which processes the water to meet the German Drinking Water Ordinance (TVO) standards with regard to contents and hygiene. The quality of this so-called service water is continuously monitored.
This high quality service water is then supplied to the households on the estate via a separate service water network which is laid parallel to the drinking water supply. This service water is suitable for personal hygiene requirements, washing machines and dishwashers, flushing toilets and irrigating gardens. Since the service water has a very low degree of water hardness, the demand for cleaning agents and detergents is correspondingly reduced. When heating this water, there is no need for additional descaling agents.
In order to be able to use the service water in the houses, it is necessary to plan a second pipeline parallel to the one supplying drinking water right from the start. Laying the additional pipes can then be managed at low additional cost for new buildings. This additional expense is offset by the benefit of a reduced consumption of drinking water, cleaning and descaling agents and, because there is no seepage system, there are no restrictions on using the water for gardening.

Wastewater collection and treatment

Vacuum toilet with up to 10 times less water demand than conventional water-saving toilets
Vacuum toilet with up to 10 times less water demand than conventional water-saving toilets

If the vacuum system is constructed right into the home, it is possible to install vacuum toilets in the bathrooms which require 5 to 10 times less flushing water than conventional toilets.

Domestic wastewater is purified biologically in a high performance, anaerobic membrane plant. A main characteristic of this system is that it can only operate in airtight conditions, i.e. the system is completely enclosed. Odours cannot be emitted.

The planned wastewater treatment plant is able to convert the wastewater components into biogas and the nutrients nitrogen and phosphorous into utilisable fertiliser salt. The biogas is used to supply the plant with power and heat. Surplus electricity is fed back into the supply grid. The wastewater treatment process is designed in such a way that practically no sewage sludge is formed.

Installation of the subterranean rainwater storage tank
Installation of the subterranean rainwater storage tank

Kitchen biowaste

Kitchen biowaste can also be processed alongside domestic wastewater. Homeowners therefore have the possibility to equip their kitchen with an appliance for shredding kitchen waste. This is installed under the kitchen sink and adds shredded waste to the wastewater outflow.

For residents, the main advantage of treating wastewater and kitchen waste together is that there are no hygienic problems or odours from waste containers during the summer months. In addition, the organic kitchen waste substantially increases the biogas yield of the wastewater treatment plant.

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