高气泡表面积通量浮选柱气浮除藻的研究

湖泊、水库等水源的富营养化，使藻类去除成为饮用水生产的重要任务。本研究采用高气泡表面积通量浮选柱气浮除藻，考察了混凝剂、气泡表面积通量和浮选柱高度等因素的影响。试验表明，高气泡表面积通量浮选柱气浮可高效地去除绿藻、硅藻和蓝藻，叶绿素a和藻类去除率达95％以上，比传统浮选柱气浮和沉降作业有较大幅度提高。与普通气浮柱比较，高气泡表面积通量浮选柱增加了气泡与藻的碰撞几率，防止因大表观充气速率造成的紊流和扰动，使气泡／藻结合体有相对静态的浮升环境，避免了气泡／藻结合体在浮升过程中的脱落，实现对藻类的迅速捕集和转移。

Application of column flotation with high bubble surface area flux for algae removal from source water

Removal of algae including cyanophyta, chlorophyta and euglena from source water is essential to the production of drinking water due to severe eutrophication of lakes and reservoirs. This paper describes the flotation column with high bubble surface area flux and the effects of parameters such as the dosage of coagulant, bubble surface area flux, and column height on the removal efficiency of algae. The reasonable arrangement of multi-spargers can also exclude intensive disturbance, which is unable to be avoided in traditional flotation facilities caused by high superficial gas velocity, and create favorable static environment for the attachment and floating of bubble-algae flocs in the column. The flotation results confirmed that the column can generate sufficient and very fine bubbles at high superficial gas velocity to increase the collision possibility of bubble and algae. This new equipment has shown to be capable of achieving chlorophll a and algal removal efficiencies of over 95%. It is concluded that the performance of column flotation with high bubble surface area flux in algal removal from source water is much higher than that of conventional column flotation or that of traditional sedimentation.