2006 Fiscal Year Final Research Report Summary
Study on improvement of hypoxic water using micro-bubble aeration and prediction of its effects on long-term environmental charge.
| Project/Area Number |
14102026
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (S)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
水工水理学
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
ISOBE Masahiko The University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院新領域創成科学研究科, 教授 (20114374)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SATO Shinji The University of Tokyo, Graduate School of Engineering, Professor, 大学院工学系研究科, 教授 (90170753)
KOIBUCHI Yukio The University of Tokyo, Graduate School of Engineering, Assistant Professor, 大学院新領域創成科学研究科, 講師 (60349800)
FUJITA Masafumi University of Yamanashi, Interdisciplinary Graduate School of Medical and Engineering, Research Associate, 大学院医学工学総合研究部, 助手 (60362084)
|
|---|
| Project Period (FY) |
2002 – 2006
|
| Keywords | Micro-bubble / Oxygen-depleted water / Tokyo Bay / Pelagic and Benthic environment / Mitigation / Sediment oxygen demand / Benthos / Solar-Panel |
|---|
| Research Abstract |
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.
|
