Treatment of Sulfonated Azo Dye Reactive Red 198 by UV/H₂O₂

Table 5

Effect of the irradiation time and in-line addition in some physical-chemical parameters. Experimental conditions: initial pH of 10 and 60°C.

Treatment	Time (min)	pH	Conductivity (S/cm)	H2O2 residual (%)
UV/1% H2O2/60°C; (beginning of the experiment)	0	10.00 ± 0.01	811.00 ± 2.79	1.00 ± 0.01
	60	9.94 ± 0.11	1695.40 ± 14.35	0.60 ± 0.05
	120	8.17 ± 0.13	1712.20 ± 12.40	0.36 ± 0.04
	180	7.13 ± 0.12	1766.30 ± 17.53	0.29 ± 0.04
	240	6.72 ± 0.15	1802.10 ± 15.41	0.05 ± 0.06
UV/1% H2O2/60°C; (addition of H2O2 in-line)	0	10.00 ± 0.02	811.00 ± 2.79	0.00 ± 0.00
	60	7.23 ± 0.12	1228.40 ± 13.80	0.74 ± 0.06
	120	6.07 ± 0.14	1326.70 ± 12.26	0.69 ± 0.04
	180	5.23 ± 0.13	1347.20 ± 16.93	0.71 ± 0.03
	240	4.43 ± 0.10	1433.90 ± 14.98	0.18 ± 0.05