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The effects of the photochemical pre-treatment by using a pilot-plant UV/H2O2 process on the biodegradability of aqueous linear alkylbenzene sulfonate (LAS) were studied. It was observed that thephotochemical pre-treatment of the LAS solutions by UV-254/H2O2 increased the biodegradability of LASsolutions. Aqueous solutions with higher concentrations of LAS (> 100 mg/L) were non-biodegradable. Theratio of BOD5/COD of the pre-treated LAS solutions was increased, indicating that the pre-treated LAS solutionswere more biodegradable. This ratio was improved as the LAS solutions were more pre-treated. Also,the biodegradability factor for the pre-treated LAS solutions was increased as the time of the photochemicalpre-treatment was increased

Effects of pilot-plant photochemical pre-treatment (UV/H2O2) on the biodegradability of aqueous linear alkylbenzene sulfonate (LAS)