Struvite Precipitation and Biological Dissolutions

Struvite is a salt that is formed out of Mg2+,NH4+ and PO43- and it crystallizes in form of MgNH4PO4.6H2O. Struvite’s (magnesium ammonium phosphate or MAP) precipitation has recently been regarded as an interesting technique to remove phosphate and ammonium from waste water.

The high elimination rates and the possibility of recycling the struvite as a direct slow release fertilizer make this process feasible and appealing. However, the costs due to the raw chemicals needed are drawbacks that leave aside the application of the process in some facilities.

The MAP biological dissolution makes possible a recycling of magnesium and phosphate, a fact that reduces the processes costs and will help making it even more feasible and environmentally friend. This thesis goes also through the parameters, reactions and different techniques that optimize the struvite precipitation process.
Source: KTH
Author: Ezquerro, Ander

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