Study on improvement of hypoxic water using micro-bubble aeration and prediction of its effects on long-term environmental charge.

海湾底部的缺氧水对底栖生物和其他生物造成严重损害。这种水可以通过提供微气泡来改善。虽然在整个海湾安装微气泡发生器是不可行的，但可以将它们安装在海湾的某些区域，这些区域更容易受到缺氧条件的影响，然后这些区域可以在蓝潮之前作为鱼类的避难所。由于气泡的表面积与体积相比大，并且气泡的上升速度慢，因此气泡在将氧气转移到水中方面是有效的。为了确定微气泡在改善水质和底栖环境方面的作用，进行了实验室和现场试验，在实验室试验中，考察了微气泡在各种条件下的溶氧效率。在现场实验中，发现微气泡技术在实际现场将氧气转移到水中是有效的。进一步的观察显示了微气泡扩散和改善沉积物需氧量的特征。此外，微气泡的供应可以推动微生物群落的变化。现场试验的结果将为封闭海湾贫氧水体的治理提供必要的系统设计思路。

Oxygen-deficient water at the bottom of the bay causes serious damage to benthos and other living organisms. This water can be improved by supplying micro-bubbles into it. Although it is not feasible to install micro-bubble generator all throughout the bay but it may be possible to install them in some areas of the bay that are more likely to be affected by anoxic condition and then these areas can serve as a refuge for fishes just prior to the blue tide.Micro-bubble is efficient in transferring oxygen to water because of its large surface area compared to volume and of its slow rising velocity. To determine the micro-bubble effect in improving water quality and the benthic environment, laboratory and field experiment had been performed.In the laboratory experiment, the oxygen dissolution efficiency of the micro-bubble was examined under the various conditions. In the field experiment, micro-bubble techniques were found to be effective in transferring oxygen to water in the actual field. A further observation showed characteristic of micro-bubbles diffusion and improvement of sediment oxygen demand. In addition, the supply of micro-bubbles can drive shifts in microbial communities. These results of field experiment will give an idea for a required system to improve the oxygen-depleted water in closed bays.