碩士 / 國立臺灣大學 / 生物環境系統工程學研究所 / 98 / Water quality in open ponds is vulnerable to be affected by external factors, in order to control the stability of water quality, practitioners in relevant industry consider that replacement water is the most effective way. To avoid excessive waste of water resources in order to balance the management of the breeding environment, and ensure adequate supply and distribution of oxygen to stabilize one of the key water quality. Therefore, in the ponds to set a variety of oxygen equipment as the main method.
This study investigates the micro-bubble and paddlewheel oxygen equipment for CFdesign simulation, and Chiayi, Ilan field measurement test. Of the configuration, use the number and configuration of the quantity of horsepower, flow fields on the ponds, the impact velocity and dissolved oxygen distribution. The simulation of flow fields, velocity distribution area percentage, divided into red zone, the Green Zone and dead spots, as measured partition of the reference site, to understand the different equipment in the velocity difference partitions, and to explore the aeration efficiency of oxygen equipment and equipment economy.
The field test results from Chiayi and Ilan show that ponds, the higher the proportion of dead spots, the lower the stirring capacity of water, the dissolved oxygen is also driven lower. paddlewheel velocity distribution by the surface and the water level more visible, dead spots of the total area of 28.6 ~ 50.7%, micro-bubble velocity distribution by the bottom water layer is obvious, dead spots of the total area of 36.1 ~ 97.9% shows that paddlewheel made body of water capacities than tankers stirred micro bubble machine. Comparison of two kinds of oxygen equipment efficiency to the scene of the micro-bubble best, the standard oxygen transfer efficiency is 3.47 kgO2/hr, paddlewheel, compared with 2.47 kgO2/hr.
| Identifer | oai:union.ndltd.org:TW/098NTU05404055 |
| Date | January 2010 |
| Creators | Chia-Chen Wu, 吳佳真 |
| Contributors | Wen-Shang Hou, 侯文祥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 94 |
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