Removing of Pesticides From water using Advanced Oxidation Processes including: O3, H2O2 and UV in combination

Abstract

The performance of advanced oxidation processes involving the combination of O₃, UV and H₂O₂ was investigated in this study using semi batch lab scale experiments for the mineralization of the pesticides, atrazine (ATZ), alachlor (ALC) and diazinon (DIZ). Different parameters, H₂O₂ concentration, pesticide concentration and pH were tested to find the optimum conditions for the mineralization of ATZ. Mineralization of single, binary and ternary mixture of the pesticides was tested using the optimum conditions obtained for ATZ. The results show that ATZ and DIZ were mineralized completely, while ALC achieved 93% of mineralization by the combination of O₃, UV and H₂O₂(420mg/L) treatment for 5mg/L concentration of each pesticide. The mineralization of binary mixture of ALC+DIZ, ALC+ATZ and DIZ+ATZ achieved 100, 88 and 83% respectively. A ternary mixture of ALC, DIZ and ATZ achieved 78% of mineralization. A kinetic model was used to predict the experimental data, good fitting was observed between the model and the experimental data.