Odor control in wastewater treatment: The removal of thioanisole from water - A model case study by pulse radiolysis and electron beam treatment

A novel electron beam irradiation process has proven to be effective in rem oving thioanisole (methyl phenyl sulfide, CH3S-C6H5) from aqueous solutions . This paper presents substrate destruction data at pH 5 and pH 9. To apply a kinetic model, which predicts removal efficiencies, overall rate constan ts for reactions of thioanisole with (OH)-O-. radicals, hydrated electrons, and hydrogen atoms were newly measured or carefully re-determined by pulse radiolysis. The respective values are (9.90 +/- 0.13) x 10(9) (3.1 +/- 0.1 ) x 10(8), and (3.24 +/- 0.08) x 10(9)(M s)(-1). comparison of the model pr edictions to the experimental results revealed a very good agreement at pH 5 and an overestimation of the removal at pH 9. The presence of an addition al scavenger at pH 9 but not at pH 5 reacting with (OH)-O-. radicals, hydra ted electrons and hydrogen atoms is considered to be responsible for the de crease in removal efficiency.