Analyzing the data in Fig. 1, one can observe that all three factors have asignificant influence on coagulation efficiency. Thus, an increase of initialturbidity leads o a higher efficiency, while terms x2 – x22 (corresponding to Aldosage), and x3 – x32 (pH) have an opposite significance, indicating an optimumrange. This behavior can be easily observed in 3D plots and in their correspondingcontour plots, presented in Figs. 3-5.
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