Table 2.

Comparison of different advanced oxidation approaches in term of COD reduction (%) and cavitational yield (mg/J).

Type of effluent	Treatment scheme	Oxidant/chemical loading	Treatment time (min)	COD reduction (%)	Cavitational yield (10−3$\times$ mg/J)
Effluent-I	Only US	CaO:1g/L	130	27.3	1.17
	Only Fenton	H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L	70	81.7	–
	Only ozone	O3: 1 g/h	70	47.6	–
	US + Fenton + Lime	H2O2:15 g/L, H2O2/Fe2+:3, CaO:1g/L	70	63.9	5.49
	US + Fenton + Lime	H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L	70	94.8	7.89
	US + Fenton + Lime	H2O2:20 g/L, H2O2/Fe2+:3, CaO:1g/L	70	94.0	8.06
	US + Fenton + Lime	H2O2:22.5 g/L, H2O2/Fe2+:3, CaO:1g/L	70	94.7	8.11
	US + Fenton + Lime	H2O2:30 g/L, H2O2/Fe2+:3, CaO:1g/L	70	92.9	7.18
	US + Fenton + Lime	H2O2:17.5 g/L, H2O2/Fe2+:1, CaO:1g/L	70	87.1	7.38
	US + Fenton + Lime	H2O2:17.5 g/L, H2O2/Fe2+:2, CaO:1g/L	70	92.6	7.52
	US + Fenton + Lime	H2O2:17.5 g/L, H2O2/Fe2+:4, CaO:1g/L	70	90.8	7.48
	US + Ozone	O3: 0.5 g/h	70	37.3	0.77
	US + Ozone	O3: 1 g/h	70	51.6	1.06
	US + Ozone	O3: 2 g/h	70	51.6	1.02
	US + Ozone	O3: 3 g/h	70	48.4	0.99
	US + Fenton + O3	H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L, O3:1g/h	30	95.1	5.23
Effluent-II	Only US	CaO:1g/L	130	29	2.44
	US + Fenton + Lime	H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L	70	51	8.50
	HC + Fenton + Lime	H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L	70	58	564.36