Shon H K, Vigneswaran S, Ngo H H, Kim J-H
Faculty of Engineering, University of Technology, Sydney, P.O. Box 123, Broadway, NSW 2007, Australia.
Water Res. 2005 Jul;39(12):2549-58. doi: 10.1016/j.watres.2005.04.066.
An experimental investigation was made to study the effects of chemical coupling of flocculation and adsorption with photocatalysis in treating persistent organic pollutants in wastewater. The photocatalysis alone showed initial reverse reaction when titanium oxide (TiO(2)) was used in catalysis. The effect of the pretreatment of adsorption with powdered activated carbon (PAC) on photocatalysis was studied. The results showed that PAC adsorption followed by photocatalysis was not effective in alleviating reverse reaction. On the other hand, when PAC and TiO(2) were added simultaneously, the reverse reaction was eliminated. Further, the organic removal was also improved by simultaneous PAC and TiO(2) additions. When flocculation with ferric chloride (FeCl(3)) was used as pretreatment, the organic removal efficiency was superior. The initial reverse reaction was also eliminated/minimized. However, inadequate doses of FeCl(3) (less than 30 mgl(-1)) resulted in initial reverse reaction and inferior DOC removal.
开展了一项实验研究，以探讨絮凝和吸附化学耦合与光催化相结合处理废水中持久性有机污染物的效果。单独使用光催化时，以二氧化钛（TiO₂）作催化剂会出现初始逆反应。研究了用粉末活性炭（PAC）进行吸附预处理对光催化的影响。结果表明，先进行PAC吸附再进行光催化并不能有效缓解逆反应。另一方面，当同时添加PAC和TiO₂时，逆反应得以消除。此外，同时添加PAC和TiO₂还提高了有机物去除率。当用氯化铁（FeCl₃）进行絮凝预处理时，有机物去除效率更高。初始逆反应也得以消除/降至最低。然而，FeCl₃投加量不足（低于30 mgL⁻¹）会导致初始逆反应以及溶解性有机碳（DOC）去除效果不佳。
