Recirkulering af fosfor - fra affald i byerne til ressource i økologisk landbrug

Sasha Gry Hegelund & Lea Sandalgård Knudsen

Studenteropgave: Bachelorprojekt


This thesis examines the possibilities of using recirculated phosphorous streams in organic farming on Zealand. The focus is on the potentials for using waste-products from organic waste from households in the municipality of Copenhagen and production of struvite, a phosphorous-rich sewage waste-product, at BIOFOS’ three wastewater treatment plants in the capital area. The thesis includes organic farmer’s views and perceptions on using waste products as fertilizers in organic agriculture, and furthermore how this recirculation complies with the organic principles.
There is a potential in recirculation of phosphorous from organic waste and sewage water from Copenhagen to cover the needed phosphorous in organic farming. Struvite would need to be approved as a fertilizer in the European regulation on organic farming before it can be used. Furthermore the values of heavy metals in organic waste from households needs to be lowered before it can be used in organic farming. If both products are approved and complies with the limit values for heavy metals, the two phosphorous waste streams from the capital area of Copenhagen can cover the need for organic phosphorous, as alternatives to the current use of conventional manure in organic agriculture on Zealand.

UddannelserBasis - Humanistisk-Teknologisk Bacheloruddannelse, (Bachelor uddannelse) Bachelor
Udgivelsesdato31 maj 2017
Antal sider91
VejledereBente Kjærgård


  • økologi
  • landbrug
  • fosfor
  • bioøkonomi
  • recirkulering
  • næringsstoffer