Effects of surface charge, micro-bubble size and particle size on removal efficiency of electro-flotation

被引：45

作者：

Han, M. Y. ^{[1
]}

Kim, M. K. ^{[1
]}

Ahn, H. J. ^{[1
]}

机构：

[1] Seoul Natl Univ, Sch Civil Urban & Geosyst Engn, Seoul 151742, South Korea

来源：

WATER SCIENCE AND TECHNOLOGY | 2006年 / 53卷 / 07期

关键词：

charge reversal; electro-flotation; flocculation; microbubble; particle size; zeta potential;

D O I：

10.2166/wst.2006.216

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Flotation is a water treatment alternative to sedimentation, and uses small bubbles to remove lowdensity particles from potable water and wastewater. The effect of zeta potential, bubble size and particle size on removal efficiency of the electro-flotation process was investigated because previous modelsimulations indicated that these attributes are critical for high collision efficiency between micro-bubbles and particles. Solutions containing Al3+ as the metal ion were subjected to various conditions. The zeta potentials of bubbles and particles were similar under identical conditions, and their charges were influenced by metal ion concentration and pH. Maximum removal efficiency was 98 and 12% in the presence and absence of flocculation, respectively. Removal efficiency was higher when particle size was similar to bubble size. These results agree with modelling simulations and indicate that collision efficiency is greater when the zeta potential of one is negative and that of the other is positive and when their sizes are similar.

引用

页码：127 / 132

页数：6

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