气浮和沉淀工艺对三卤甲烷生成势的去除特性研究  

Removal Characteristics of THMFP by Dissolved Air Flotation and Sedimentation

作　　者：孙晓明[1] 乔琦[1] 刘景洋[1] 

机构地区：[1]中国环境科学研究院国家环境保护生态工业重点实验室,北京100012

出　　处：《中国给水排水》2012年第11期36-40,共5页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07208-002);国际科技合作项目(2010DFB90590)

摘　　要：研究了气浮和沉淀工艺对不同分子质量区间三卤甲烷生成势(THMFP)的去除效果及絮体形态对去除THMFP的影响。结果表明,气浮工艺对各分子质量区间THMFP的去除效果均优于沉淀工艺,二者均以去除大分子质量区间的THMFP为主,对小分子质量区间THMFP的去除效果较差。UV254与THMFP值的线性相关系数为0.917,UV254值可以较好地反映THMFP的含量。气浮絮体的分形维数小于沉淀絮体,孔隙率较大,可以增加对有机物的活性吸附空间;气浮絮体尺寸较小,具有更好的同向絮凝效果,增加了絮体和有机物的接触概率,从而使气浮工艺对THMFP的去除效果优于沉淀工艺。The removal efficiency of trihalomethanes formation potential （THMFP） in different molecular weight ranges by dissolved air flotation （DAF） and sedimentation was studied. The effect of floc morphology on the removal efficiency of THMFP was investigated. The results showed that the remov- al efficiency of THMFP in each molecular weight range by DAF was better than that by sedimentation. Both were more successful in removing THMFP from larger molecular weight range. The linear correlation coefficient of UV254 and THMFP was 0. 917, which indicated that UV254 could appropriately reflect the content of THMFP. The fractal dimension of DAF floc was less than that of sedimentation floe, and the porosity of the DAF floe was larger than that of sedimentation floc, which resulted in enhanced floccula- tion and adsorption space of organic matter. The size of DAF floe was smaller and the efficiency of ortho- kinetic flocculation was better, which could increase the contact probability between floc and organic mat- ter. So the removal efficiency of THMFP by DAF was better than that by sedimentation.

关 键 词：气浮 沉淀 三卤甲烷生成势 分子质量分布 絮体形态 

分 类 号：TU991.2[建筑科学—市政工程]