Nwafulugo F. U., Adefila S. S.*, Olawale A. S
A factorial analysis using Mini Tab 14 software was carried out to study the interaction effects of the factors; zeolite 4A dose, contact time and initial concentration. This screening process helped in determining factors that has significant effects on the response among the three factors of interest. The result indicates that the three-way-interaction had the highest effect on the response and should be more carefully controlled during routine experiment. The p-values were less than 0.05 for the one way interaction (zeolites 4A dose), the two way interaction (zeolite 4A dose – contact time) and the three way interaction depicting a high interactive effect of the three factors on the response with the three-way interaction having the highest magnitude as aforementioned. The values of R2= 98.90% R2 (adj) = 97.94 % indicates that the model is significant to the process. This was further validated by the residual plots which proved the model to be a good replica of the experimental data.
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