Combined Application of Coagulation/Flocculation/Sedimentation and Membrane Separation for the Treatment of Laundry Wastewater

Table 5

Analysis of variance (ANOVA) of the Doehlert design for the removal (%) of color and turbidity (α = 0.05).

Source of variation	Color				Turbidity
	SQ	DF	MS	Fcalc	SQ	DF	MS	Fcalc
Regression (d)	3328.979	5	665.796	273.99	2548.89	5	509.78	33.96
Lack of fit (a)	2.430	1	2.430	0.2685	15.075	1	15.075	1.0045
Pure error (b)	99.551	11	9.050		165.082	11	15.007
Residues (a + b = c)	101.981	12	8.498		180.158	12	15.013
Total (c + d)	3532.942	17			2729.051	17

SQ = sum of squares; DF = degrees of freedom; MS = mean of squares; F_calc = F calculated. Color: F_table (5; 12; 0.05) = 3.11; R² = 0.97;  = 0.957. Turbidity: F_table (5; 12; 0.05) = 3.11; R² = 0.934;  = 0.906.