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Bauer Beregnung Rainstar
Braunschweig in Germany

Making water valuable again

31 irrigation machines from Bauer operate under the unique Braunschweig model in northern Germany. The local wastewater association secures the production of food and energy plant production in this way.

The Braunschweig Waste Water Association is a water and soil association located in Braunschweig in northern Germany and is responsible for wastewater treatment in Braunschweig and the surrounding area. With its 80 employees and an annual revenue of approximately 35 million euros, the association is considered a mid-sized business in Germany.

The Braunschweig model developed by the association is unique throughout Germany and combines wastewater from the city with bioenergy from the surrounding rural areas to create a water-food-energy cycle:

The wastewater is treated mechanically and biologically, and the resulting clean water is used to irrigate the agricultural lands of the association members. The energy plants cultivated in the irrigated regions are processed in the association’s own biogas plant for CO²-neutral production of biogas. This secures the supply of several thousand households in Braunschweig with power and heat.

Bauer Beregnung Rainstar
2000 hours per year

31 Rainstars in action

The wastewater association currently used 31 irrigation machines from Bauer to distribute the treated water. The oldest Bauer irrigation machine has been in operation already since 2003 and has exhibited no major problems in this time. The machines are in operation from February to October, for an average of 2,000 operating hours per year. Thanks to the full galvanization, the Bauer machines are reliable, long-lasting and operate with low pressure losses. For this reason, the Braunschweig Waste Water Association is already planning to purchase further Rainstars in future.

Grafik Abwasserverband D

The water cycle

  1. Each resident of Braunschweig and its environs consumes 122 liters of water per day, which flows into the sewer network.
  2. 86 pump stations bring 700 liters of water per second to the Steinhof treatment plant for cleaning. The plant treats 60,000 cubic meters of waste water both mechanically and biologically.
  3. 20,000 cubic meters of clean water is brought to the sewage-irrigated field daily for secondary treatment and storage.
  4. 2,700 hectares of agricultural land is irrigated each year with 10-11 million cubic meters of cleaned waste water.
  5. The energy crops cultivated in the irrigation area of the Braunschweig Wastewater Association are used for the CO2-neutral production of biogas in the association's own biogas plant. The Braunschweig wastewater association supplies the biogas via a 20-kilometer pipeline to the local energy supplier, which generates electricity and heat for several thousand households in Braunschweig.