Batch and column tests for the development of an immobilization technology for toxic heavy metals in contaminated soils of closed mines |
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| Affiliation: | 1. Institut des Sciences Chimiques de Rennes (UMR CNRS 6226), Université de Rennes 1, 263 avenue du Général Leclerc, 35042 Rennes cedex, France;2. Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 2 rue de la Houssinière, 44322 Nantes cedex 3, France;3. CEISAM, Université de Nantes, CNRS, 2 rue de la Houssinière, 44322 Nantes cedex 3, France;1. Department of Resources Engineering, National Cheng Kung University, No. 1 University Road, Tainan, 70101, Taiwan, ROC;2. Department of Earth Sciences, National Cheng Kung University, No. 1 University Road, Tainan, 70101, Taiwan, ROC;3. Chemistry Division, Institute of Nuclear Energy Research, 1000 Wenhua Rd. Jiaan Village, Longtan District, Taoyuan City, 32546, Taiwan, ROC;4. Nuclear Science and Technology Development Center, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan, ROC;1. Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea;2. Department of Biostatistics, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea;3. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea;1. The sixth affiliated hospital of SUN YAT-SEN University, Guangzhou, China;2. Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China;3. Cancer Center, Traditional Chinese Medicine-Integrated Hospital, Southern Medical University, Guangzhou, China;4. Cancer Center, Traditional Chinese Medicine-Integrated Hospital, Southern Medical University, Guangzhou, China;5. Department of Oncology, Panyu Central Hospital, Cancer Institute of Panyu, Guangzhou, China;1. Center for Precision and Automated Agricultural Systems, Washington State University, Prosser, WA 99350, USA;2. Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA;3. Department of Horticulture, Washington State University, Prosser, WA 99350, USA;1. Laboratoire de Ressources Minérales et Environnement, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Tunis, Tunisia;2. Departamento de Geociencias, Universidade de Aveiro, P-3810-193 Aveiro, Portugal;3. Université de Bordeaux, UMR 5805 EPOC, F-33400 Talence, France;4. INRAP, Laboratoire Matériaux Utiles, Pôle Technologique, 2020 Sidi Thabet, Tunisia |
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| Abstract: | Laboratory tests of various chemical treatments for the immobilization of copper, nickel, and lead in soils typically found at mine facilities were evaluated. A series of balch, adsorption tests, and lab-scale continuous column tests were conducted to optimize the design parameters for the full-scale immobilization processes. The laboratory test program consisted of batch and column experiments to measure the leachability and subsequent immobilization of the single heavy metal, Cu2++, Pb2++, and Ni2++ in an artificial soil which was composed of bentonite and quartz fine sand. Batch equilibrium methods were used to test the ability of a large number of chemical additives to react with heavy metals in contaminated soil. The two best treatment chemicals (CaO and Na2S) for each soil-metal combination were selected for more detailed columns studies. The column tests were carried out in the acidic pH range. According to the results of the column leaching test, it was found that the degree of heavy metal leaching is highly dependent on pH. An adsorption test was performed under acidic conditions (pH 4) to evaluate bentonite as an additive to treat acid mine drainage (AMD). |
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