A TiO_2-suspended continuous photoreactor system combined with the separation of TiO_2 particles by coagulation for the photocatalytic degradation of dibutyl phthalate

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Electrolyte-promoted easy separation of suspended TiO_2 particles with a solids retaining type centrifuge was developed by improving the coagulation method with basic aluminum chloride. The centrifuge was combined with a continuous flow photoreactor and the degradation of dibutyl phthalate(DBF) was examined.1.Coagulation of TiO_2 fine particles with electrolytesTiO_2 was added in an aqueous solution containing ImM electrolytes. The pH of the suspension was adjusted to 6.5(isoelectric point of TiO_2). The coagulation was increased in the order : Na_2SO_4〜__=CaCl_2>NaCl.2.Continuous centrifugation of Ti02 fine particles promoted by the addition of electrolytesThe relation between influent rate(residence time) of the suspension added the electrolytes and transmittance(T) of the discharge was examined. Under the setted conditions, T of the discharge was more than 98%.3.Continuous centrifugation of TiO_2 fine particles promoted by the electrolytes in well and tap waterGood separation was attained for well and tap water whose electrolytes amount are 50% of ImM Na_2SO_04.4.The presence of electrolytes and second reuse of recovered TiO_2 reduced the decomposition by 20%.5.Continuous flow operation was attained by connecting the photoreactor with the centrifuge.6.The combined system was successfully applied to the treatment of DBF spiked in well and tap water.