PAN Hua chen, YANG Yi jun, TU Han chao, TIAN Xiao qing

 

(School of Mechanical Engineering, Hangzhou Dianzi University, Zhejiang Hangzhou 310018, China)

 

 

Abstract: Aiming at improving the water quality of stratified lakes and reservoirs, artificial aeration was investigated. In a tank, the influences of aeration flow and orifice diameter of diffuser on aeration were studied by experiments. After aeration, dissolved oxygen of water at 1 meter, 2 meter and 2.3 meter below surface was measured at different time. The diffuser was installed at 2 meter, while in the rectangular center, horizontally. The results indicate that: the bigger aeration flow is, the faster stratified water destroyed; Time of distratification decreases when the orifice diameter decreases. But with the increasing of aeration flow, the dissolved oxygen is not increased. The dissolved oxygen increases, when the orifice diameter decreases. What is more, dissolved oxygen of water column under diffuser is a constant no matter how aeration parameter changes. It is meaningful for engineering of stratified water destroyed.

 

Key words: underwater aeration; stratified water; aeration flow; orifice diameter of diffuser