Removal of anionic surfactant sodium dodecyl sulfate from aqueous solutions by O 3/UV/H 2O 2 advanced oxidation process: Process optimization with response surface methodology approach

摘要

This study investigates the removal of sodium dodecyl sulfate (SDS) by O 3 /UV/H 2 O 2 process. Response surface methodology based on central composite design was used to assess the effects of process parameters including initial pH, H 2 O 2 concentration, ozone dosage and reaction time on SDS removal. Analysis of variance showed that all parameters had significant effects on SDS removal. SDS removal increased significantly with increasing pH, ozone dosage and reaction time. Quadratic model was used for the response variable, i.e., SDS removal, and the predicted removal was 96%. Optimum conditions were obtained based on the performance of O 3 /UV/H 2 O 2 process in reaction time of 55?min, initial pH of 7.0, 10?mM?H 2 O 2 concentration and 10?mg?L ?1 ozone dosage. The model predictions were in an agreement with the experimental data with a deviation less than 2%.