| The removal efficiencies of 2-methylisoborneol(MIB) by KMnO4,NaClO,H2O2,O3 etc were compared, and it was found that ozone was the most effective oxidant for MIB removal. By investigating the factors of the removal of MIB by ozone, it was found that the removal of MIB increased with pH increase. And MIB was removed more than 90% after 20min when pH was 7.0~10.0. But MIB removal efficiency decreased when pH reached 10.0. However, it decreased in the presence of bicarbonate and tert-butanol that scavenge ?OH in water. It indicated that MIB degradation mainly followed radical mechanism. The removal efficiency of MIB in Songhua River was almost the same as the results obtained in distilled water. One possible reason is that the carbonate concentration is low(less than 50mg/L), in that way, ?OH may be less scavenged. Also, NOM may promote the removal of MIB by ozone in Songhua River. |
