Optimization of Electrochemical Treatment Process Conditions for Distillery Effluent Using Response Surface Methodology

Table 4

Regression coefficients obtained by the response surface model.

Term constant	COD reduction (%)		Color reduction (%)
	Regression coefficient	value	Regression coefficient	value
Intercept	86.19	<0.0001	91.01	<0.0001
	6.99	<0.0001	10.97	<0.0001
	8.94	<0.0001	12.47	<0.0001
	−5.08	0.0014	1.12	0.3784
	9.21	<0.0001	9.52	<0.0001
	−6.27	0.0027	−10.87	<0.0001
	−16.14	<0.0001	−20.37	<0.0001
	−4.64	0.0167	−4.94	0.0092
	−9.71	<0.0001	−1.93	0.2586
	6.87	0.0070	−2.75	0.2083
	1.37	0.5894	−4.77	0.0382
	−3.04	0.1843	−4.51	0.0482
	−6.09	0.0110	−0.81	0.6895
	−7.83	0.0021	−11.95	<0.0001
	1.86	0.4384	−3.66	0.0559