Experimental Design of Photo-Fenton Reactions for the Treatment of Car Wash Wastewater Effluents by Response Surface Methodological Analysis

Table 5

ANOVA coefficient of regression and checking¹.

Variable	Standard deviation			Coefficient
	2.405956	2.691238	0.043235	6.475
	2.405956	0.249381	0.812987	0.6
	2.405956	−3.20039	0.023985	−7.7
	3.541472	8.704009	0.000331	30.825
	3.402536	−1.61644	0.166922	−5.5
	3.402536	−0.22042	0.834259	−0.75
	3.541472	6.953324	0.000945	24.625
	3.402536	0.543712	0.609995	1.85
	3.541472	7.673364	0.000599	27.175

: coefficient of determination; values were 0.97 for COD percent removal.