臭氧催化氧化-活性炭处理微污染源水

STUDIES ON EFFICIENCY OF CATALYTIC OZONATION-GAC PROCESSES FOR THE PURIFICATION OF MICRO-POLLUTED SOURCE WATER

通过连续流试验比较了载锰颗粒活性炭催化臭氧氧化(催化氧化)与臭氧氧化及其后续活性炭过滤对微污染松花江水的处理效能。处理效率最高时,催化氧化对CODMn、UV254、DOC及三卤甲烷生成潜能的平均去除率分别为59.7%、75.8%、40.8%和42.4%,分别是臭氧氧化的3.6、1.4、5.0和2.8倍。随着时间的增加,催化氧化对有机物平均去除率下降,降低程度依次为:UV254>CODMn>DOC。催化氧化-活性炭工艺对水力负荷变化有较强的适应能力。臭氧氧化后水中氨氮浓度上升,而催化氧化后稍有下降,同时催化氧化后续活性炭对氨氮的平均去除率在80%左右,比臭氧氧化后续活性炭去除率高而且更加稳定。

A comparative study between ozonation catalitic oxadation by Mn-loaded activated carbon （catazone） and ozonation as well as their subsequent GAC filtration was conducted on the purification of micro-polluted Songhua River water. In the most effective condition of catazone, the average removal rate of permanganate index （CODMn、UV254、DOC and trihalomethanes formation potential by catazone were 59.7%, 75.8%, 40.8% and 42.4% respectively, and were 3.6, 1.4, 5.0 and 2.8 times of these of ozonation. The effectiveness of the catazone declined with operating time, and the declining degree sequence was UV254〉CODMn〉DOC. Furthermore, catazone-GAC processes had stronger ability to adapt the changes of hydraulic loading. Ammonia-nitrogen concentration increased after ozonation, while it decreased a little after catazone, and the ammonia-nitrogen removal rate of GAC filtration following catazone was about 80%, which was higher and more steady than that of GAC filtration following ozonation.