A Novel Photocatalyst with Ferromagnetic Core Used for the Treatment of Olive Oil Mill Effluents from Two-Phase Production Process

Table 2

COD reduction in OMW and MOMW after lab-scale UV/TiO₂ photocatalysis.

Raw effluent	Catalyst type	Catalyst dosage; g L^−1	CODfinal; g L^−1	−ΔCOD4h; %	ΔCOD (0.5); g L^−1	B; g L^−1 h^−1
OMW (CODinitial 14.5 g/L)	Degussa P-25	1	12.1	16.5	1.3	2.6
		3	11.8	18.6	2.5	2.9
		9	11.5	20.7	2.8	3.3
		20	11.8	18.6	2.7	3.0
	Ferromag. TiO2	1	11.4	21.4	2.5	3.2
		3	12.5	13.3	1.6	2.2
		9	13.1	10.3	0.6	1.6
MOMW (CODinitial 3.6 g/L)	Degussa P-25	1	1.7	54.3	10.1	9.2
		3	1.6	56.5	10.0	9.3
		9	1.5	57.0	10.1	9.5
	Ferromag. TiO2	0.5	1.5	58.4	9.8	9.3
		1	1.6	55.7	10.0	9.1
		3	1.7	52.7	9.9	8.7