Effects of Solution pH and Seed Material on MAP Crystallization

Abstract

Experimental results revealed that solution pH was one of the most important factor which effected not only phosphorus recovery percentage but also phosphorus recovery rate during the struvite forming process. Introduction of seed materials increased the phosphorus recovery percentage to an extent and optimum seed particle range and adding amount were 70-140 mesh and 0.5g (solution pH=8.5). The one-stage seed addition worked better than multi-stage addition and phosphorus recovery percentage rose with increasing initial seed dosing. Seed addition speeded the phosphorus recovery rate to some extent on the whole.