A method is discussed of phosphate precipitation from municipal wastes and from the strongly polluted waters using water extract of brown coal fly ash from the Konin power plant. It is shown, that phosphate precipitation occurs immediately after introduction of the coagulant and after a short and intensive mixing.
Precipitation intensity depends mainly on the v coefficient (ratio of mass of a alkalinity in the extract to that in the water to be treated) and on the alkalinity of the treated water. Using a mathematical model of regression curve, described and applied in this paper, the degree of influence of each parameter on the process of phosphate precipitation has been determined.