碩士 / 國立屏東科技大學 / 環境工程與科學系所 / 106 / Remineralization after seawater desalination is one of the important topics in drinking water today. The seawater produced by the desalination plant using reverse osmosis is highly corrosive and corroded if not remineralized. The water pipeline, and the heavy metals and other substances in the pipeline and the materials are released into the water, and the taste is very poor. In this study, calcium powder (Ca(OH)2) and limestone (CaCO3) were used as medicines to investigate the effect of carbon dioxide (CO2) aeration on seawater freshwater remineralization under different reaction times and dosages. Dosing conditions that are consistent with the water quality of the Langelier Saturation Index (LSI).
The results of the study show that water temperature has a significant effect on the solubility of gases or drugs. Basically, the high water temperature has a high solubility for the drug, and the low water temperature has a low solubility for the drug, and the gas is the opposite. In the control group and the experimental group of this study, the results of the CO2 aeration water sample of the experimental group and the Ca(OH)2 control group were compared with those of the experimental group. When the water temperature was 20 °C, the solubility of the experimental group was greater than that of the control group, but at 30 °C, there was no significant difference between the control group and the experimental group, or the dissolution of the control group was better than that of the experimental group, but the overall solubility was Above 20 ° C, at low water temperature, CO2 solubility is better than water body temperature, so more CO2 gas is dissolved in water at 20 °C, and dissolved in water at 30 °C due to temperature increase. CO2 will dissolve less than 20 °C; in addition, the same water body of 30 °C, the solubility of the control group will be better than the experimental group, because the gas enters the water body, causing the water body to be from the original 30 ° C depending on the length of aeration, There are some reasons for the temperature drop; most of the time in the experiment, the temperature is the biggest factor in the study.
However, in this study, it was found that the water quality of the LSI water quality optimization was Ca(OH)2, and the CO2 aeration was 6-2.0 g/L. The optimization of water quality is not only for the public to drink water with peace of mind, but also for the government to reduce the corrosion rate of the pipe diameter and reduce the cost of public water supply. The manufacturer can also significantly reduce the cost of drugs and pursue the best water quality. Only to achieve a win-win situation.
| Identifer | oai:union.ndltd.org:TW/106NPUS5615013 |
| Date | January 2018 |
| Creators | Wang, Li-Yun, 王利云 |
| Contributors | Chen, Kuan-Chung, 陳冠中 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 125 |
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