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以长江重庆段水质为研究对象,考察臭氧对混凝去除水中有机污染物的影响。结果表明,臭氧预氧化后,TOC、UV254的去除率分别为2.5%、11.0%,说明臭氧可以部分彻底氧化去除水中有机物,预氧化后有机物的结构改变比较明显;相比于单独混凝,臭氧联合混凝使TOC和UV254的去除率分别提高了4.9～5.3和12.1～14.2个百分点,臭氧预氧化可以强化混凝对TOC和UV254的去除;臭氧预氧后各个分子段有机物的分布改变比较明显,相对分子质量大于3×103的有机物明显减少,相对分子质量小于3×103的有机物明显增加。相比于单独混凝,臭氧联合混凝主要提高了相对分子质量大于3×103的有机物去除率,降低了相对分子质量小于3×103有机物的去除率。
Taking Chongqing’s water quality in the Yangtze River as the research object, the effects of ozone on the removal of organic pollutants in water by coagulation were investigated. The results showed that the removal rates of TOC and UV254 were 2.5% and 11.0% respectively after ozone pre-oxidation, indicating that ozone could partially oxidize and remove organic compounds in water. The structure of organic compounds changed obviously after pre-oxidation. Combined coagulation increased the removal rates of TOC and UV254 by 4.9 ~ 5.3 and 12.1 ~ 14.2% respectively. Ozone preoxidation enhanced the removal of TOC and UV254 by coagulation. The distribution of organic compounds in each molecular segment changed obviously after ozone preoxidation , The relative molecular mass of organic matter greater than 3 × 103 decreased significantly, the relative molecular mass of less than 3 × 103 organics significantly increased. Compared with the coagulation alone, the combined coagulation of ozone mainly improves the removal rate of organic matter with a relative molecular mass of more than 3 × 103, and reduces the removal rate of organic matter with a relative molecular mass of less than 3 × 103.