Abstract
Landfill leachate is categorized as recalcitrant wastewater and its treatment is a necessary measure for environmental protection. Recently, photocatalytic treatment of recalcitrant wastewaters using N-, P-, and N-P-type TiO2 nanoparticles under visible light irradiation has attracted researchers’ attention. This study aims at investigating the photocatalytic removal efficiency of leachate chemical oxygen demand (COD) using tungsten (W)-Carbon (C)-codoped titanium dioxide (TiO2) nanoparticles under visible light irradiation. A cascade photoreactor with immobilized W-C-codoped TiO2 nanoparticles was applied to overcome the limitations of mass transfer and aeration in immobilized photocatalytic treatment processes. The effect of operating parameters such as coating surface density, light intensity, leachate recirculation flow rate, and initial leachate COD on the COD removal efficiency was experimentally investigated. Based on the results, 84 % of leachate COD was removed after 40 h treatment under the conditions of 550 mg.L−1 initial leachate COD, 40 W light intensity, 10.59 g.m-2 coating surface density, and 1 L.min−1 leachate flow rate. In addition, the COD removal efficiency of leachate with 550 mg.L−1 initial COD under 40 h sunlight irradiation, which was 46 %, was equal to that under 40-W light irradiation. The photocatalytic COD removal efficiency of leachate with high initial COD (10,100 mg.L−1) was 32 % after 60 h treatment. The findings of this research offer new insights about efficient photocatalytic treatment of landfill leachate using cascade photoreactor under visible light irradiation on a modest and large scale.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call