碩士 / 國立臺灣大學 / 環境工程學研究所 / 105 / The accumulation of nutrients in reservoirs and lakes leads to eutrophication and frequent occurrence of algal blooms. During the periods of algal blooms in reservoirs, the cost of water purification and various environmental problems will increase. In order to ensure sound operation of the water purification unit and the safety of public water supply, many in situ treatment methods have been developed to remove algae and reduce the release of toxic substances. Reducing the intensity of irradiation through the water surface may be an approach to reduce photosynthesis and inhibit algal blooms.
In this study we choose activated carbon and charcoal powders as shading materials for their black color and stable property. Charcoal was powdered by using ball mill, and activated carbon by ball mill and adding arabic gum. Results of the settlement experiments showed that charcoal powders had lower settling rate and higher extinction coefficient than activated carbon suspension. Chl-a, DO, and pH were monitored throughout the shading experiments. The results showed that these two kinds of materials were able to inhibit the photosynthesis and lower the algae growth. However, the strong adsorption of pigments on activated carbon and charcoal interfered the measurement of Chl-a. The reduction of algal growth after shading the light could only be suggested by the decrease of pH and dissolved oxygen as well.
Comparing to the shading test by using plastic film in Jinmen Xihu Reservoir, the approach of applying carbon powder is easier to operate in-situ and having lower maintenance cost. As a sorbent, carbon can also absorb pollutants in the water. The results of this study have provided a feasible algal control measure.
| Identifer | oai:union.ndltd.org:TW/105NTU05515015 |
| Date | January 2017 |
| Creators | Yu-Jhih Chan, 詹妤芝 |
| Contributors | 吳先琪 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 58 |
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