Photo-Fenton and Fenton Oxidation of Recalcitrant Industrial Wastewater Using Nanoscale Zero-Valent Iron

Table 5

Results of statistical analyses of independent variables.

	Dark-Fenton				Photo-Fenton
	COD reduction		TOC reduction		COD reduction		TOC reduction
Term	Effect	𝑃	Effect	𝑃	Effect	𝑃	Effect	𝑃
Constant		0.00		0.00		0.00		0
H2O2 : COD Ratio	17.3	0.01	12.4	0.02	0.9	0.91	6.8	0.07
H2O2 : nZVI Ratio	−11.0	0.02	−12.0	0.02	−5.0	0.57	0.0	0.99
Doses	6.8	0.04	3.3	0.12	−0.7	0.94	3.0	0.24
H2O2 : COD Ratio * H2O2 :  nZVI Ratio	−9.3	0.02	−8.4	0.03	−5.7	0.52	0.9	0.68
H2O2 : COD Ratio * Dose	7.8	0.03	5.2	0.08	−6.8	0.46	0.0	0.99
H2O2 : nZVI Ratio * Dose	−5.8	0.05	−1.6	0.40	−4.9	0.58	1.2	0.57
H2O2 : COD Ratio * H2O2 : nZVI Ratio*Dose	−8.0	0.02	−5.3	0.07	−5.7	0.52	−1.8	0.43
Ct Pt		0.07		0.01		0.91		0.39