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为了确定3种工艺:混凝-沉淀-砂滤-后臭氧-生物活性炭滤池(工艺Ⅰ)、预臭氧-混凝-沉淀-砂滤-生物活性炭滤池(工艺Ⅱ)和预臭氧-混凝-沉淀-砂滤-后臭氧-生物活性炭滤池(工艺Ⅲ)中臭氧的最优投加量和投加方式,采用动态实验进行了不同工况下有机物的去除效果研究,并从臭氧利用率的角度对3种工艺进行比较。同时,为了明晰工艺Ⅲ中各个单元对有机物的去除机制,研究了各处理阶段的有机物分子质量分布情况。结果表明,工艺Ⅲ在最佳工况下出水水质最优,但单位臭氧利用率较低,单位臭氧去除CODMn、TOC分别为0.92 mg/L和0.55 mg/L。该工艺中预臭氧可显著降低有机物分子质量水平,混凝沉淀砂滤主要去除分子质量>3 k Da的有机物,后臭氧则将大分子有机物进一步氧化为分子质量<3k Da的有机物,后者通过生物活性炭滤池得到有效地去除。因此,通过臭氧和生物活性炭的联用,能够有效去除有机物,是一种适宜的饮用水深度处理工艺。
In order to determine the three processes: coagulation - sedimentation - sand filtration - after ozone - biological activated carbon filter (process Ⅰ), pre - ozone - coagulation - sedimentation - sand filtration - biological activated carbon filter Coagulation-sedimentation-sand filtration-post-ozone-biological activated carbon filter (process Ⅲ) in the optimal dosage of ozone and dosage method, the dynamic experiments were conducted under different conditions organic matter removal effect, and from the use of ozone Rate of the three kinds of technology to compare. At the same time, in order to clarify the mechanism of organic matter removal in each unit of process Ⅲ, the distribution of organic molecular mass in each treatment stage was studied. The results showed that process Ⅲ had the best effluent quality under the best conditions, but the unit ozone utilization rate was relatively low. The unit CODMn removal by ozone, TOC was 0.92 mg / L and 0.55 mg / L, respectively. In the process, pre-ozone can significantly reduce the molecular weight of organic matter. Coagulation and sedimentation sand filtration mainly removes organic matter with a molecular mass of more than 3 kDa. Post-ozone further oxidizes the macromolecular organic substance to organic matter with molecular mass <3 kDa, Biological activated carbon filter is effectively removed. Therefore, through the combination of ozone and bio-activated carbon, which can effectively remove organic matter, it is a suitable deep treatment of drinking water.