[Investigating the efficiency of UV/H[2]O[2] process for removal of linear alkylbenzene sulfonate [LAS] in aqueous solutions]

ABSTRACT

Surfactants are one of the largest pollutants which exist in urban and industrial wastewaters. Large quantities of surfactants have entered to the environment since last decade due to increased use of synthetic detergent in industrial and home consumptions.In this study, the efficiency of UV/H[2]O[2] process in removal of linear alkylbenzane sulfonate [LAS] from aqueous solutions was investigated. In this study methylene blue active substane[MBAS]method and spectrometery were used to determine anion and residual surfactant respectively. In this study important variables were H[2]O[2] concentration, initial concentration of surfactant, pH and duration of UV radiation. The effect of UV/H[2]O[2] process on the degradation of LAS was analyzed statistically by using Multiple Linear Regression test. The resulted showed that after 20 minute, ultraviolet radiation solely removed 38.44 percent of Anionic detergent, Hydrogen peroxide showed no significant removal of detergent solution in the time course study. The efficiency of UV/H[2]O[2] process in 10, 20 and 30 minute were to 86.2, 90 and 96.5%, respectively. The results showed that the efficiency of ultraviolet radiation and hydrogen peroxide process in anionic detergent was not significant thoogh it was considerable in combination process [UV/H[2]O[2]]