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臭氧/紫外线/活性炭工艺是将臭氧氧化、紫外线光解及催化氧化、活性炭吸附及催化氧化结合以提高去除效率的一种新工艺。本文研究了该工艺对水体中天然有机污染物的代表物质腐植酸的降解效果及影响因素。通过静态试验,在中性条件下对比了臭氧、臭氧/紫外线、臭氧/活性炭、臭氧/紫外线/活性炭工艺的降解效果,其中臭氧/紫外线/活性炭工艺降解效果最好。臭氧/紫外线/活性炭工艺对腐植酸溶液CODCr及UV254的降低率分别为48.9%和53.8%,比单独臭氧化工艺分别高出了25.8%和19.2%,比臭氧/紫外线工艺分别高出了13.5%和11.7%,比臭氧/活性炭工艺分别高出了12.5%和10.1%。pH值越高,臭氧通入越多,氧化反应速率越高,去除率也越高。最后,对臭氧、紫外线、活性炭三者协同作用的机理做了探讨。
Ozone / UV / activated carbon process is a new process that combines ozone oxidation, UV photolysis and catalytic oxidation, activated carbon adsorption and catalytic oxidation to improve removal efficiency. In this paper, the degradation of humic acid and its influencing factors on natural organic pollutants in water were studied. By static test, ozone, ozone / ozone, ozone / activated carbon, ozone / UV / activated carbon process were compared under neutral condition, and ozone / UV / activated carbon process was the best. The reduction rates of CODCr and UV254 in humic acid solution by ozone / UV / AC were 48.9% and 53.8%, respectively, which were 25.8% and 19.2% higher than that of ozone alone and 13.5% higher than that of ozone / UV. And 11.7% higher than the ozone / activated carbon process by 12.5% and 10.1% respectively. The higher the pH, the more ozone is introduced and the higher the oxidation reaction rate, the higher the removal rate. Finally, the mechanism of the synergistic action of ozone, ultraviolet ray and activated carbon was discussed.