Development of a process for the enhanced phosphorus recovery from the organic matrix of agricultural residues

Phosphorus (P) can be recovered in a sustainable way from agricultural residues (e.g. animal manure, digestate). However, current state of the art technologies can only recover the soluble inorganic P in the liquid fraction after mechanical separation, which can be as low as only 20% of the total P content. In this thesis, enzymatic and chemical processes for the increase of this soluble P content in the liquid fraction were investigated. In addition, a concept for the integrated nutrient recovery from pig manure was proposed.