Amendment of Drilling Fluid-Affected Soils with Calcium Salts
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概要
- 論文の詳細を見る
Land disposal of waste drilling fluid is an environmental concern because of the high salt content and the presence of potential toxic elements. A water-based drilling fluid was tested in a laboratory column study to determine the feasibility of leaching excessive salt without mobilizing chromium (Cr). The drilling fluid-affected two Alfisols with similar mineralogy, acidity, and texture were treated with gypsum (CaSO_4・2H_2O), calcium carbonate (CaCO_3), or calcium phosphate (CaHPO_4) (0 to 2% of weight). The electrical conductivity (EC) increased and the sodium adsorption ratio (SAR) decreased with increasing Ca-salt concentration. The pH did not vary significantly with the changes in the concentrations of gypsum and calcium phosphate. The pH of the mixtures increased in proportion to the concentration of added calcium carbonate. The hydraulic conductivity increased and the mobility of the soil particles decreased with increasing Ca-salt concentration. The Cr mobility decreased by gypsum and CaCO_3 treatments but it increased by calcium phosphate treatment. The soil with a higher content of organic matter and cation exchange capacity (CEC) showed a higher hydraulic conductivity and lower Cr mobility than the other soils at the same levels of the treatment. The results of this study suggest that the amendment of drilling fluid-affected soils with CaCO_3 and gypsum can enhance the leaching of excessive salt and reduce the Cr mobility. Among loamy soil, those with a higher CEC and organic matter content are more suitable for land disposal of drilling fluid.
- 社団法人日本土壌肥料学会の論文
著者
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Kim Jae
Department of Anatomy, College of Medicine, Pusan National University
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Kim Jae
Department Of Earth System Sciences Yonsei University
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Dixon J
Department Of Soil And Crop Science Texas A&m University College Station
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Dixon Joe
Department of Soil and Crop Science, Texas A&M University College Station
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Moon H.S.
Department of Earth System Sciences, Yonsei University
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Moon H.
Department Of Obstetrics And Gynecology College Of Medicine Ewha Womans University
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Moon H.s.
Department Of Earth System Sciences Yonsei University
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Kim Jae
Department Of Anatomy College Of Medicine Pusan National University
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Kim Jae
Department Of Anatomy And Brain Korea 21 Project For Medical Science Yonsei University College Of Medicine
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Dixon Joe
Department of Soil and Crop Science, Texas A&M University College Station
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Kim Jae
Deparment of Obstetrics and Gynecology, Seoul National University Collge of Medicine
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