碩士 / 國立宜蘭大學 / 環境工程學系碩士班 / 104 / Soil contamination is an urgent problem which should be solved instantly. Chemical stabilization technique has been used for reclamation of contaminated soils due to several advantages, including easy operation, inexpensive, and friendly for environment. This method has been employed to substitute other expensive techniques for recovery of the industrial areas and farmlands. The objective of this study is using aquaculture’s wastes, including coral bone, natural zeolite, and activated carbon, as chemical stabilizers for treatment of three farmland soils which contaminated with Cu, Zn, Ni, Cd, and Pb. The variations in Cu, Zn, Ni, Cd, and Pb extractabilities and major nutrients in soil were examined when the stabilization reagents were added through an experiment performed with simulating natural precipitation. The results showed that the stabilization reagent with the smallest size could cause the highest decrease in metallic extractability. Furthermore, stabilization reagent which suppressed the extractability of heavy metal was followed the order: coral bone > activated carbon > zeolite.
Sample A (a soil contaminated with Cu, Zn, and Ni): After treatment with both used zeolite and fresh zeolite, the Cu, Zn, Ni extractabilities declined to about 57, 74, 58, 43, 65, and 58% of their original levels respectively. The Cu, Zn, Ni extractabilities declined to about 43, 48, 42, 43, 43, and 25% of their original levels after the additions of used carol bone and fresh carol bone respectively. The Cu, Zn, Ni extractabilities declined to about 43, 70, 50, 29, 57, and 23% of their original levels after the additions of used activated carbon and and fresh activated carbon respectively. After the addition of zeolite nitrogen extractability level became 1.1 and 1.4 times higher than that obtained by additions of used carol bone and used activated carbon. Extractable phosphorus content in soil increased 2.3 times its original level after the addition of used zeolite, however, this level declined to only 14% and 57% of initial level when the soil was treated with used carol bone and used activated carbon, respectively. Extractable potassium content obtained by used carol bone treatment was 1.7 and 1.8 times higher than those treated by used zeolite and used activated carbon treatments.
Sample B (a soil only contaminated with Cd): Stabilization reagent suppressed the Cd extractability was followed the order: coral bone > activated carbon > zeolite. The Cd extractability declined to about 40, 50, 20, 30, 30, and 50% of their original levels after the additions of used zeolite, fresh zeolite, used carol bone, fresh carol bone, used activated carbon, and fresh activated carbon, respectively. After the addition of carol bone, nitrogen extractability level in soil became 1.3 and 1.2 times higher than that obtained by treatment with used zeolite and used activated carbon. Extractable phosphorus content in soil increased 1.2 times its original level after the addition of used zeolite, however, this level declined to only 23% and 77% of initial level when the soil was treated with used carol bone and used activated carbon, respectively. Extractable potassium content in soil obtained by treatment with used carol bone became 1.4 and 1.5 times higher than those treated by used zeolite and used activated carbon.
Sample C (a soil only contaminated with Pb): Stabilization reagent which suppressed the Cd extractability was followed the order: coral bone > activated carbon > zeolite. The Pb extractability declined to about 33, 56, 0, 22, 33, and 56% of their original levels after the additions of used zeolite, fresh zeolite, used carol bone, fresh carol bone, used activated carbon, and fresh activated carbon, respectively. After the addition of carol bone, nitrogen extractability level in soil became 1.2 and 1.1 times higher than that obtained by additions of used zeolite and used activated carbon. After the addition of used zeolite, extractable phosphorus content in soil slightly increased, however, this level declined to only 0% and 40% of initial level when the soil was treated with used carol bone and used activated carbon, respectively. The change of extractable potassium content was insignificant by the treatment of all stabilization reagents for all soil samples. Carol bone had high priority in recommendation for the remediation of farmland contaminated with heavy metals.
Keywords: heavy metal, extractability, Chemical stabilization, Zeoilite, Activated carbon, Coral bone
| Identifer | oai:union.ndltd.org:TW/104NIU00515015 |
| Date | January 2016 |
| Creators | Li,Chi-Shiuan, 李奇軒 |
| Contributors | Liu,Cheng-Chung, 劉鎮宗 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 67 |
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