Thermodynamic Modeling of Phosphorus Recovery from Wastewater

Abstract Municipal wastewater is an interesting source of phosphorus and several processes for the recovery from this have been described. These yield magnesium ammonium phosphate (MAP), a valuable fertilizer. In these processes, pH shifts addition chemicals are used to influence species distribution in solution such as finally obtain desired product prevent co-precipitation salts heavy metal ions. Elucidating distributions experimentally challenging cumbersome task. Therefore, present work, thermodynamic model was developed that can be predicting various steps process. The combines extended Debye-Hückel equation prediction activity coefficients with dissociation constants solubility data literature contains no parameters need adjusted process data. successfully tested by comparison experimental Stuttgart analyzing different steps. Furthermore, it demonstrated how optimizing Graphical