碩士 / 國立中央大學 / 環境工程研究所 / 102 / Traditionally, there are a lot of chemical and physical methods to remove heavy metal ions from industrial sewage. Due to the variety of industrial effluent, it is very difficult to get inexpensive good removal efficiency. Presently, many studies are devoted to develop low cost and reusable biosorbent to get rid of harmful substance in the solution.
In this study we use common floating macrophytes in Taiwan ( Eichhomia crassipes, Pistia stratiotes, Lemna minor ) as the raw materials to investigate their adsorption capacity of metal ions. The experiments include two parts, one is to prepare the adsorbent and use different chemicals to modify it, and to compare the capacity of adsorption of heavy metal. Another is to plant the plants in industrial discharge which contained the metal ion, observe the growth of plants and the metal ions concentration change in solution during the plant’s growth.
The experimental results show that the adsorbent prepared from the plants contained more carboxyl and hydroxyl group has higher capacity to adsorp the heavy metals. The FTIR spectra showed that there are carboxyl groups and hydroxyl groups in biosorbents, which are able to react with heavy metal ions obviously in aqueous solution. The adsorbent modified using NaOH is better than other modifier, due to NaOH.
Three species of floating plants were planted in industrial discharge which contain copper ion. In 20 mg-Cu/L system, the copper concentration decreased with the plant growth. The copper concentration decreased under the effluent standards 3 mg/L after 3 to 5 days. By the mass balance, we know that the amount of copper decrease in solution is equal to the amount increase in the plants. If plants accumulate too much copper, it will be poisoned even leads to fatal.
| Identifer | oai:union.ndltd.org:TW/102NCU05515009 |
| Date | January 2014 |
| Creators | HSIN-YU CHEN, 陳欣妤 |
| Contributors | 李俊福 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 105 |
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