Table 4: Effects and model coefficients for sulfur removal.

TermsMean sum of squaresCoefficients -value value Significance*
Coded valueActual value

Constant41.899.8 92.32 17.01 0.000 HS
(H2O2/S) 1624.5 0.62 65.93 0.000 HS
(Time) 12.5−1.25 0.013 5.09 0.058 S
(Facid/S) 4.50.75 0.042 1.83 0.218 PS
252.5 0.0038 10.17 0.015 S
45.63−3.7 −0.022 18.57 0.003 HS
4.8−1.2 −0.0048 1.95 0.02 S

Residual2.46

: highly significant, S: significant, and PS: possibly significant.