For the solid fraction, the idea is to process it to a low P solid fraction and a phosphateconcentrate (struvite).
Currently, a pilot installation of this process is operational at Groot Zevert. Nijhuis Industries will start construction of the full-scale installation shortly, based on the concept of Wageningen University & Research (WUR).
WUR developed the Re-P-eat technology, in which different steps of acidifiction of the the solid fraction lead to a solution that is rich in phosphorus.
Subsequent separation with a screw press and adding lime (magnesiumhydroxide) to the liquid fraction renders struvite crystals. These precipitate and are simply recoverd from the liquid fraction. This could be used for the production of mineral or organic fertilisers.
The solid fraction, poor in P because 90% of the inital P is removed, is very well-perceived in the Netherlands, which has strict phosphorus application limits.