Degradation of Anionic Surfactant by AOP - Solar/TiO2 and UV/TiO2

摘要

Alternative methods of treating anionic surfactant simulated wastewater by Advanced Oxidation Process Solar/TiO2 and UV/TiO2 were studied. The first half of this research focuses on the Solar/TiO2 treatment of wastewater by studying effects of TiO2 dosages, reaction time, light intensity, surfactant (Sodium Dodecyl Benzene Sulfonate, SDBS) concentration and TiO2 particle sizes. The second half of this research studies the treatment with UV/TiO2 method by using the optimum conditions obtained from Solar/TiO2. The SDBS removal percentage approaches nearly 100% for both Solar/TiO2 and UV/TiO2 while the COD (Chemical Oxygen Demand) removal percentage reaches to 87.9% for Solar/TiO2 method with average solar light intensity (Iav) of 1.0461 mW/cm 2 and 52.3% for UV/TiO2 method with UV- I av of 0.1 mW/cm 2 due to apparatus UV-intensity limitation. In addition, adsorption of SDBS onto TiO2 is fitted to Langmuir isotherm. The modified Langmuir-Hinshelwood kinetic model (L-H model) is also applied to UV/TiO2 and Solar/TiO2 treatments. The experimental data fit both models well and the adsorption constants from both models are close to each other. Therefore, both models can be applied to TiO2 treatment of anionic SDBS surfactant wastewater.