PROCESS AND AN APPARATUS FOR CHEMICAL REDUCTION OF PHOSPHATE CONTENT OF WATER BY ADDING AT LEAST ONE REAGENT WHICH FORMS A CRYSTALLINE DIFFICULTY SOLUBLE SALT, AND CONTACTING THE LIQUID WITH A SEED MATERIAL PROMOTING THE CRYSTALLISATION

摘要

ABSTRACT OF THE DISCLOSUREThe present invention provides a process for chemicalreduction of the phosphate content of water by adding at leastone reagent which forms a crystalline difficultly soluble salt,and contacting the liquid with a seed material promoting thecrystallisation, characterized in that the contacting takes placein a bed of grains of the seed material promoting the crystalisa-tion fluidized and kept in fluidisation by the water stream, andthat the introduction of the reagent or reagents is effected soas to have a substantially complete heterogenous nucleation takeplace on the seed material.