Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) were performed in a combined mode on dry M-struvite powders using a heat flux TGA/DSC 3+ device from Mettler Toledo. All measurements were carried out under a nitrogen atmosphere (flow of 100 ml min -1 ). As a reference material for the heat flux DSC an α-Al2O3 corundum crucible was used. All samples were heated from room temperature to 850°C with a heating rate of 10°C min -1 . The different endo-or exothermic peaks were fitted with Pseudo-Voigt functions to determine peak onset and centroid temperature.