I´m working in the sector "P-recovery from sewage". With GWB I want to reproduce what´s happening with different sewage. The treatment of supernatant liquor shows struvite as recovered product. So I expanded thermo.dat by the mineral struvite. After several complications ( ) it worked. But now: If I choose in the basis "HPO4--" I just get Hydroxylapatite in GtPlot (while Hydroxylapatite and Struvite are supersaturated". If I choose "PO4---" I just get Struvite. The pH-value is neutral to alkaline, so "HPO4--" has to be the right form....Another problem: I just have the thermodynamic constant for Struvite at 25 °C, no other one.
Does somebody have an idea, what´s wrong?
Thank you very much.