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

Table 4

Effect of solar light intensity on the degradation rate constant of color filter wastewater^a.

Solar Light Intensity	^b𝑘COD, hr^−1	^c𝑘TOC, hr^−1
250 W/m^2 (UV280−400nm: 27.5 W/m^2)	0.154	0.118
500 W/m^2 (UV280−400nm: 66.5 W/m^2)	0.197	0.147
750 W/m^2 (UV280−400nm: 114 W/m^2)	0.218	0.165

^aWastewater temperature: 25 ± 0.5°C.
^b𝑘_COD: pseudo-first-order rate constant based on the degradation of COD in solution.
^c𝑘_TOC: pseudo-first-order rate constant based on the degradation of TOC in solution.