Inorganic fertilizer is produced from limited geological sources. Potassium and phosphorus can be recovered from waste streams in the form of potassium struvite, but only if the ammonium content is low. In this work, potassium struvite formation is assessed on centrate after nitrogen removal by anammox.
The use of inorganic fertilizer in large scale has had a profound effect on global nutrient flows. Currently 109 Mton nitrogen, 21 Mton phosphorus and 32 Mton potassium are added to fields as fertilizer every year . This has led to increased agriculture yields and that more people can be sustained by each hectare of arable land, which has helped the world population to grow to the current 7 billion people we are today.