Temperature-dependent phosphorus precipitation and chromium removal from struvite-saturated solutions

► Struvite-saturated solutions were reacted at 25, 100, and 300 °C. ► Struvite, newberyite, and magnesium pyrophosphate were the dominant precipitates. ► Removal of Cr(III) with the solid phase was observed at all temperatures. ► At 300 °C removal from Cr(VI) solutions was facilitated by reduction to Cr(III). ► Cr(III) formed short-range polymers that were adsorbed to the mineral surface.