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

通过改进碱式氯化铝混凝法，研制了电解质促进固液分离型离心机分离悬浮态TiO_2。将离心分离机与连续流动光反应器相结合，研究了光催化降解邻苯二甲酸二丁酯（DBF）的效果。将悬浮液的pH调节至6.5（TiO_2的等电点）。2.添加电解质促进TiO_2微粒的连续离心研究了添加电解质的悬浮液的进水速率（停留时间）与放电透过率（T）的关系。在设定的条件下，3.电解质促进的TiO_2微粒的连续离心，对于电解质含量为50%ImM Na_2SO_4的自来水和井水，都能达到良好的分离效果。4.电解质的存在和回收的TiO_2的二次利用，使TiO_2的分解率降低了20% 5.将光反应器与离心机连接，实现了连续流操作。6.成功地将该组合系统应用于处理井水和自来水中的DBF。

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.