协同催化臭氧化工艺对水中微量有机污染物的降解

Degradation of micro quantity organic compound in water using synergetic catalysis and ozonation

选用城市二级出水作为试验原水,通过静态试验考察了O3、O3/C、O3/UV、O3/UV/C对水中难以生化降解的微量有机物的处理效果。结果表明:波长为254nm的紫外线和活性炭对水中微量有机物的臭氧化过程具有协同催化作用,并可大幅度提高对臭氧的利用率;在紫外线和活性炭的协同催化臭氧化作用下,对水在254nm处紫外吸光度(E254)的去除率达到87.40%,水中CODCr的去除率可达到59.79%,臭氧的利用率可提高到91.4%。通过考察叔丁醇和碳酸氢钠两种自由基捕捉剂对O3/UV/C反应器处理效果的影响,表明在紫外线和活性炭的协同催化臭氧化作用下,水中有机污染物的氧化降解是多种自由基反应的结果,其中以羟基氧化反应为主。

The water from the final clarifier of municipal waste water treatment was selected as original water containing micro concentration recalcitrant organic contaminants andthe captive test was conducted. The degradation effects of organic contaminants in the water, which was difficult to remove by biochemical process, were investigated with four methods： O3, O3/C, O3/UV and O3/UV/C. The results showed that besides improving the ozonation degradation of micro concentration organic contaminants and the utilization of ozone, ultraviolet light at 254nm wavelength and activated carbon had synergetic action on ozonation. The results of captive test showed that, in the O3/UV/C reactor, the removal rate of ultraviolet absorbency E254 and the removal rate of CODCr could be up to 87.40% and 59.79% respectively. The utilization of ozone could be up to 91.4%. The influence of different radical scavengers on ozonation were investigated. The results showed that the ozonation degradation of organic contaminants in the water from the final clarifier was due to different kinds of radical reactions and hydroxide radical reaction played the most important role.