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

通过对碱式氯化铝混凝方法的改进，研制了电解液助凝的固体式离心机分离悬浮二氧化钛颗粒。将离心机与连续流动光反应器相结合，考察了邻苯二甲酸二丁酯(DBF)的降解。1.在含有IMM电解液的水溶液中加入二氧化钛与电解液进行凝聚。将悬浮液的pH值调节到6.5(二氧化钛等电点)。提高混凝效果的顺序为：Na2SO4=CaCl2&GT；NaCl2.加入电解液可促进二氧化钛微粒的连续离心，考察了加入电解液的悬浮液的进水速度(停留时间)与出水透过率(T)的关系。在设定的条件下，出水温度T>98%。3.利用井水和自来水中的电解液促进的二氧化钛微粒的连续离心法，实现了井水和自来水的良好分离。4.电解液的存在和回收的二氧化钛的二次利用使分解效率降低了20%。5.将光反应器与离心机相连接，实现了连续流动操作。6.将该组合系统成功地应用于井水和自来水中DBF的处理。

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.