Performance Optimization of Chemical and Green Coagulants in Tannery Wastewater Treatment: A Response Surface Methodology Approach

Table 6

Analysis of variance for response surface model for %COD removal (), %TSS removal (), and SVI () with aluminum sulphate.

Term	d.f	F-value			value
		Model	5	66.2	33.6	572	≤0.001	≤0.001	≤0.001
	1	112	9.63	164	≤0.001	0.017	≤0.001
	1	61.8	14.4	611	≤0.001	0.007	≤0.001
	1	55.7	36.1	40.3	≤0.001	≤0.001	≤0.001
	1	52.1	20.7	612	≤0.001	0.003	≤0.001
	1	41.9	4.36	66.3	≤0.001	0.075	≤0.001
Lack-of-fit	3	0.53	0.47	5.77	0.688	0.720	0.062