耦合光催化与生物处理4-氯酚废水

采用三相内循环式流化床光反应器和固定床生物反应器耦合处理4-氯酚(4-CP)废水。光反应器中采用粗孔硅胶负载的具有高活性和长寿命的TiO2为催化剂，处理效率高。废水的BOD5／COD及固定床生物反应器处理效果表明，4-CP为难生物降解物，光催化预处理能显著增强废水的可生化性。在单级耦合处理中，光催化预处理4h后进行生物处理，能达到最佳效率，但要完全矿化COD则需要延长预处理时间。光催化预处理为生物处理提供可降解性COD，后者却没有机会作用于前者。在多级耦合处理中，两者之间存在协同作用，使多级耦合处理效率大大提高。

Treatment of Chlorophenol Wastewater by Coupled Photocatalytic and Biological Processes

p - Chlorophenol wastewater was treated by coupled photocatalytic process in an inner - loop triphasic fluidized reactor and biological process in a fixed bed reactor. Photocatalytic reactor uses porous silica - supported titanium dioxide as catalyst, which has high activity and long life. BOD5/COD analysis and treatment in the fixed bed bioreactor show that p - chlorophenol is biologically recalcitrant and the biodegradability of the wastewater can be improved greatly by photocatalytic pretreatment. In the single - stage coupled processes, a better treatment efficiency can be obtained by 4 h - photocatalytic pretreatment and biological treatment, but complete mineralization needs more time of pretreatment. Photocatalytic pretreatment can offer biodegradable COD to biological treatment, but the latter has no opportunity to affect the former. In contrast, there is synergistic effect between the two kinds of treatment in the multi - stage coupled processes, which can significantly increase the treatment efficiency.