Sustainable Water Treatment and Nutrient Reuse Options

Abwasserverbandes Braunschweig (AVBS)

The wastewater-association Braunschweig was founded in 1954. The association started to irrigate wastewater – from the beginning until 1979 untreated raw wastewater – on agricultural areas. Nowadays the water is treated in a large wastewater treatment plant. This plant was constructed for about 350.000 inhabitant’s equivalents. The average amount of influx is about 60.000 m³/d and about 21 Mill. m³/y. 15 m³/y were reused by sprinkler irrigation in the area of the Association and 6 Mill. m³/y has an biological after-treatment in a surface-flooding-area. The sprinkler irrigation area comprise of about 3.000 ha. The water demand for agricultural purpose was calculated with 300 mm/y additional sprinkler irrigation amounts annually. 150 mm/y were calculated in the vegetation period. Experience has shown in the following decades that the additional water quantity could be increased up to 500 mm/y.

the association infers a great deal of importance in the cluster not just for its dissemination potential, but because their main project has been to integrate wastewater providing communities, operating the wastewater treatment plant with a capacity and expand application of treated wastewater through irrigation in agricultural fields. Therefore, their daily business provides them with experienced input for the German cluster enrichment. The city of Braunschweig (local water authority) is member of the association and provides this cluster with this connection already established.