摘要
对ES DAF气浮装置进行了研究 .该装置取消了溶气灌 ,在循环泵的压水管和吸水管之间装有一个射流器和一个静态混合器进行吸气和溶气 .采用显微摄像系统 ,对该装置中气泡粒径分布进行了探讨 .结果表明 ,当环流比由 10 %增加到 4 0 %时气泡平均粒径由 5 2 9μm降低到 4 0 9μm ,当表观气水比由 12 %降低到 4 %时 ,气泡平均粒径由 5 5 9μm降低到 4 0 1μm .这说明提高溶气系统中的紊流强度能够形成更多的原始气泡核位 ,从而可以形成更小的气泡 .随着溶气压力由 30 0kPa增加到6 0 0kPa ,气泡粒径分布曲线变低变宽说明压力的升高加剧了气泡的碰撞与并聚作用 .
ES-DAF unit was introduced and studied in this paper. Without a costly air saturator, ES-DAF consists of an ejector and a static mixer between the pressure side and suction side of the recycle rotary pump. The bubble size distribution in this novel unit was studied by using a CCD imagination through a microscope. The bubble size decreased with the increase of cycle ratio or the decrease of superficial air-water ratio. These results suggest that smaller bubbles would be formed when the initial number of nucleation sites increase by enhancing the turbulence intensity in the saturation system. The bubble size distribution became lower and wider with the increase of saturation pressure because of more frequent bubble collision and coalescence.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第1期111-113,共3页
Environmental Science
基金
国家自然科学基金重大项目 ( 5 983 83 0 0 )
关键词
溶气气浮
气泡粒径分布
溶气系统
CCD成像
dissolved air flotation (DAF)
bubble size distribution
air saturation system
CCD imagination
