The Landeswasserversorgung withdraws about 30 million cubic metres of water from the Danube annually. The water is changed to drinking water of the highest quality in the Langenau Waterworks over a six-stage process. In times of low ground water levels, water extraction from the river becomes particularly important, even though less than one percent of the flow conditions of the Danube is used for drinking water supply. As the water extraction system is located near Leipheim in Bavaria, water extraction and compensatory services are regulated in an agreement.
The systems for extracting drinking water from the river water of the Danube individually consist of a raw water pumping station, which takes water directly from the river, pressure mains from the pumping station to the Langenau Waterworks and the treatment plants in the waterworks. At peak periods, up to 2300 litres of water from the Danube can be processed into drinking water per second.
The process of extracting drinking water from the Danube has been explored and optimised over many years of testing. It basically consists of the following process steps:
Process diagram of treatment at the Langenau Waterworks
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