Pretreatment of Color Filter Wastewater towards Biodegradable by Fresnel-Lens-Assisted Solar TiO₂ Photocatalysis

Table 3

Effect of Fresnel lens on the degradation efficiency and biodegradability of color filter wastewater.

Solar light source and reaction time	UV280−400nm Intensity, W/m^2	Wastewater temperature, °C	COD removal, %	TOC removal, %	AOS	BOD5/COD
Solar light + Fresnel lens, 1 h	110.3	35–45	37.4	25.8	0.01	0.150
Suntest 500 W/m^2, 1 h	66.5	25	25.9	20.3	−0.40	0.112
Suntest 500 W/m^2, 2 h	66.5	25	29.1	22.6	−0.15	0.120
Suntest 500 W/m^2, 3 h	66.5	25	32.9	24.4	−0.02	0.145