强化混凝与臭氧预氧化强化处理微污染水的对比

当源水的有机物浓度较高时,常规过滤效果明显降低,采用强化混凝和臭氧预氧化可强化过滤效果,但二者的强化机理不同。强化混凝是通过对污染物的吸附等作用,使小颗粒浊度物质、溶解性有机物、UV254得到有效去除;臭氧预氧化则是通过改善粒径相对较大的颗粒物的表面性质来强化过滤效果。臭氧预氧化会使有机物的结构发生改变,但其必须与其他分离工艺(絮凝、沉淀、过滤等)有效结合,才能强化去除污染物。滤后水的THMFP都较进水有所升高,其中臭氧预氧化强化过滤后的THMFP升幅最小。

Comparison of Enhanced Treatment of Micro-polluted Water by Enhanced Coagulation and Ozone Pre-oxidation

The efficiency of conventional filtration is remarkably lowered when source water con-tains high content organic matter.Both enhanced coagulation and ozone pre-oxidation can enhance the fil-tration efficiency, however, the mechanisms of the two enhancement methods are different.In enhanced coagulation, small-particle turbidity, dissolved organic matter and UV_(254) are effectively removed by ad-sorption.And in ozone pre-oxidation, the filtration efficiency is enhanced by improving surface properties of particles with relatively larger size, and the structure of organic matter is changed, but only through co-operation with other separation processes (flocculation, sedimentation, filtration and so on), ozone pre-oxidation can remove contaminants effectively.In addition, the trihalomethane formation potential (THM-FP) is increased after filtration under all the experimental conditions, in which ozone pre-oxidation has the lowest increase in THMFP.