Response surface methodological analysis on the optimization of polysilicate preparation

The preparation condition to the poly-silcic had important effect on the treatment efficiency of the flocculant. Take pH, Si concentration and activated time as controllable factors. A Box-Behnken Design (BBD) and response surface methodology( RSM) were employed in studying three factors of the polysilicate prepare. The response surface model of the three preparation factors and chromaticity, CODCr were constructed by the software of Design-Expert. The results show that pH=3.2, Si=0.52mol/L, activated time=100min, COD_Cr removal rate achieved 89.2%; pH=3.3, Si=0.55mol/L, activated time= 105min, chromaticity removal rate achieved 92.4%. This method may effectively reduced the experiment times of the preparation condition´s optimization,enhanced the processing effect of the inorganic coagulant polysilicate.