多相催化臭氧氧化对CHCl_3生成势降解效能研究

Efficiency of heterogeneous catalytic ozonation on THMFP

以腐殖酸为天然大分子有机物的代表物,研究了多相催化臭氧氧化技术对三卤甲烷生成势的去除规律.试验发现,催化剂的存在提高了臭氧对腐殖酸的无机矿化度,但并没有进一步改善臭氧化对腐殖酸分解产物的可生化性.在本试验条件下,反应的初始5min和20min后,催化臭氧氧化过程三卤甲烷生成势降低明显,并且显著优于单独臭氧化.而在反应的中间阶段(5～20min),催化臭氧氧化与单独臭氧化对三卤甲烷生成量的影响差异很小.对比THMFP/TOC比值,推测单独臭氧化和催化臭氧氧化后,有机物中可与氯反应生成DBP的反应点逐渐降低.相对而言,催化臭氧氧化较单独臭氧化对这些反应点的减少更有效.

Choosing humic acid as a typical natural organic matters (NOM), efficiency of heterogeneous catalytic ozonation on THMFP was studied. The results show that, in the presence of solid catalyst, the mineralization of ozone on NOM was enhanced. While the biodegradability in catalytic ozonation process did not enhanced compared with ozonation. In the test, the efficiency of catalytic ozonation on the removal of THMFP had obvious advantage on ozone oxidation alone in the initial five minutes and the last 20 minutes, in 5～20 minutes, there was no THMFP degradation difference between catalytic ozonation and ozonation alone. By comparing THMFP/TOC, it was suggested that the active sites in organic was decreased after catalytic ozonation and ozone oxidation, and the catalytic ozonation was more effective than ozonation alone.