博士 / 國立清華大學 / 物理系 / 101 / ABSTRACT
Physical Desalination
Hou Tzon-Kun, Advisors:Prof. Shy Jow-Tsong, Hong Tzay-Ming
Doctor of Philosophy in Physics
National Tsing Hua University, Hsin-Chu City, Taiwan
Current main desalination technologies include Reverse Osmosis and Multi Stage Flash Distillation. Both are operated by filtering or heating sea water under consumable materials and power loss. They suffer the weakness of blocking or stopping the main flow which leads to operation speed reduction, parts contamination and energy loading.
Our method, Physical Desalination, avoids blocking or stopping the main flow of sea water, and redistributes ions distribution and extracts purified water in low ions zone which enables the changes to get higher operation throughput and less parts contamination and low energy loading. We use electric field protected by dielectric film on electro plates to replace DC current which always causes filter contamination and consumable loss. Our electric filed can penetrate the dielectric film, move ions and change ions distribution. Without DC current related contamination we can avoid consumables loss and high throughput. By operating only in small area confined by the designed electric field we provide low operation energy and low consumables desalination_ high value desalination technologies.
Three approaches are utilized to remove ions from sea water: DC, ACDC and high frequency asymmetry AC. In the DC and ACDC approaches, desalination effects are limited to zones near electric plates from the high capacitor impedance in the interior region of desalination cell. For the high frequency AC approach, 15-5 Mega Hz asymmetry voltages were applied, to overcome the high capacitor impedance of desalination cell. This high frequency asymmetry voltage move inner ions in cell to the regulated high voltage edge plates and change ions distribution for purification. All these three approaches can be classified into ions attraction mode and rejection mode.
So far we manage to achieve a desalinate rate in the range of 0.4 %, under single pass in 20cm process unit length. With higher rate improvement and combined by multi-stages operation, we are able to approach commercial desalination effects with particularly no consumable filter loss issues, low energy and high throughput operation.
In the application to agriculture, combined with visible light reflection white plate, such as recycle alumina foils, we can preserve the rehabilitation moisture in soil. As rehabilitation area gradually extends to 0.17 times of the area of our Earth surface, the reflection energy by visible light will reduce the Earth balance surface temperature by 0.6 oC to the temperature level before Industrial Revolution. At the same time the plants on the rehabilitation area can annually absorb CO2 to two times of human annual CO2 emission. We project the cost can be easily and automatically covered by the landlords in their necessary rehabilitation activities. These approaches therefore provide the safest and cheapest Earth engineering.
Key Words: Desalination、Greenhouse
| Identifer | oai:union.ndltd.org:TW/101NTHU5198063 |
| Date | January 2013 |
| Creators | Hou,Tzon-Kun, 侯宗昆 |
| Contributors | Shy, Jow-Tsong, Hong, Tzay-Ming, 施宙聰, 洪在明 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 71 |
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