Ru/AC催化臭氧氧化难生物降解有机物

Ru/AC Catalyzed Ozonation of Recalcitrant Organic Compounds

研究了臭氧单独氧化和Ru/AC催化臭氧氧化DMP、酚类物质和消毒副产物前体物.结果表明,Ru/AC能显著提高臭氧氧化中有机物的矿化效果.在DMP降解中,反应100 min后TOC的去除率由单独臭氧氧化的28.84%提高到66.13%.在23种酚类物质降解中,反应60min后TOC的去除率由单独臭氧的9.57%-56.08%提高到41.81%-82.32%.相对于单独臭氧,Ru/AC催化臭氧氧化更能有效地降低水源水中消毒副产物的生成势,以卤乙酸生成势的降低最为明显,100 min后卤乙酸生成势由144.02μg/L降到58.50μg/L,低于美国环保局规定的限制浓度60μg/L.而使用单独臭氧处理并不能使卤乙酸生成势降到符合美国EPA的规定.比较了BAC、O3＋BAC、O3/AC＋BAC以及Ru/AC＋O3＋BAC工艺处理水源水的效果,TOC平均去除率分别为3.80%、20.14%、27.45%和48.30%;COD平均去除率分别为4.37%、27.22%、39.91%和50.00%;UV254去除率分别为8.16%、62.24%、67.03%和84.95%.Ru/AC＋O3＋BAC工艺相比其他工艺,更能有效地去除TOC、COD和UV254,整个过程中没有观察到金属Ru的溶出,是一种很有应用潜力的微污染水源水深度处理工艺.

Ozonation and Ru/AC catalyzed ozonation of dimethyl phthalate（DMP）,phenols and disinfection by-products precursors were studied.It shows that Ru/AC catalyst can obviously enhance the mineralization of organic compounds.In the degradation of DMP,TOC removal was 28.84% by ozonation alone while it was 66.13% by catalytic ozonation.In the oxidation of 23 kinds of phenols,TOC removals were 9.57%-56.08% by ozonation alone while they were 41.81%-82.32% by catalytic ozonation.Compared to ozonation alone,Ru/AC catalyzed ozonation was more effective for the reduction of disinfection by-products formation potentials in source water.The reduction of haloacetic acids formation potentials was more obvious than thichlomethane formation potentials.After the treatment by catalytic ozonation,the haloacetic acids formation potentials decreased from 144.02（μg/L） to 58.50（μg/L）,which was below the standard value of EPA.However ozonation alone could not make it reach the standard.The treatments of source water by BAC,O3＋BAC,O3/AC＋BAC and Ru/AC＋O3＋BAC were also studied.In the four processes,TOC removal was 3.80%,20.14%,27.45% and 48.30% respectively,COD removal was 4.37%,27.22%,39.91% and 50.00% respectively,UV254 removal was 8.16%,62.24%,67.03% and 84.95% respectively.Ru/AC＋O3＋BAC process is more effective than the other processes for the removal of TOC,COD and UV254 and no ruthenium leaching observed in the solution.It is a promising process for the treatment of micro polluted source water.