碩士 / 國立中央大學 / 環境工程研究所碩士在職專班-環境工程規劃 / 94 / ABSTRACT
Ethylenediaminetetraacetic acid (EDTA) has been used to extract heavy metals from contaminated soils; however, EDTA is not biodegradable and the treated soils might not be suitable for various uses. The objective of this thesis is to study the feasibility of using biodegradable sodium alginate as an extraction agent. The contaminated soil obtained from Taipei contained arsenic of 8089 mg/kg soil, and that obtained from Tainan contained chromium of 639 mg/kg with chromate of 378 mg/kg (about 59% of the total). Removal efficiency of chromium and arsenic by EDTA and sodium alginate were compared. The results showed the chromium removal efficiencies were 73 % and 70 % by EDTA and sodium alginate, respectively, and the arsenic removal efficiencies were 16 % and 11 % by EDTA and sodium alginate, respectively. The low removal efficiency of arsenic might be because that the arsenic was in form of As2O3(s), which was deposited from a exhausted gas stream as solid and was not suitable for chemical extraction. The extraction of metals by the mixture of EDTA and sodium alginate were also investigated. It was found that extraction of metal ions was most effective when sodium alginate/EDTA was 1/4.
Keywords: soil remediation, heavy metal contamination, EDTA, sodium alginate, continuous extraction.
| Identifer | oai:union.ndltd.org:TW/094NCU05087003 |
| Date | January 2006 |
| Creators | Chun-Hung Chang, 張俊鴻 |
| Contributors | Ching-Ju Chin, 秦靜如 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 81 |
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