TiO₂-Based Photocatalytic Treatment of Raw and Constructed-Wetland Pretreated Textile Wastewater

Table 2

Irradiation times given in minutes needed to obtain decolouration of different samples and the difference between both methods and between untreated (UN-T.) and pretreated (PRE-T.) samples within each method (PCOx and PCOz).

Colour	Treatment/sample	PCOx; (O2 purging) [min]	PCOz; (O3 purging) [min]	Difference between PCOx and PCOz [%]	Difference between UN-T. and PRE-T. PCOx [%]	Difference between UN-T. and PRE-T. PCOz [%]
Blue, RBL19	Untreated	90	6	93	0	0
	Pretreated	90	6	93
Red, RRD22	Untreated	210	20	90	43	25
	Pretreated	120	15	88
Black, RBK5	Untreated	210	20	90	69	50
	Pretreated	65	10	85