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| Effect of pH on transport of Pb（2＋）,Mn（2＋）,Zn（2＋）and Ni（2＋） through lateritic soil： Column experiments and transport modeling | |
| 作者姓名： | Srilert Chotpantarat Say Kee Ong Chakkaphan Sutthirat Khemarath Osathaphan |
| 作者单位： | [1]National Center of Excellence for Environmental and Hazardous Waste Management （NCE-EHWM）, Chulalongkorn University, Bangkok 10330, Thailand. [2]Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA, USA [3]Department of Geology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10220, Thailand [4]Environmental Research Institute, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand [5]Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand |
| 基金项目： | The authors would like to express our appreciation to the National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM) and the Geology Department of Chulalongkorn University for funding this research. |
| 摘 要： | This study investigated the e ects of pH on the transport of Pb2+, Mn2+, Zn2+ and Ni2+ through lateritic soil columns. Model results
by fitting the symmetric breakthrough curves (BTCs) of bromide (Br??) with CXTFIT model suggested that physical non-equilibrium
processes were absent in the columns. The heavy metal BTCs were, however, asymmetrical and exhibited a tailing phenomenon,
indicating the presence of chemical non-equilibrium processes in the columns. The retardation factors of Pb2+ were the largest of
the four metal ions at both pH 4.0 (33.3) and pH 5.0 (35.4). The use of Langmuir isotherm parameters from batch studies with
HYDRUS-1D did not predict the BTCs well. Rather the two-site model (TSM) described the heavy metal BTCs better than the
equilibrium linear/nonlinear Langmuir model. The fraction of instantaneous sorption sites ( f ) of all four metal ions on the lateritic
soil was consistently about 30%–44% of the total sorption sites. |
| 关 键 词： | pH值 Langmuir模型 柱实验 重金属离子 运输 非平衡过程 铅 模拟 |
| 收稿时间： | 3/9/2010 12:00:00 AM |
| 修稿时间： | 2010/8/25 0:00:00 |
Effect of pH on transport of Pb2+, Mn2+, Zn2+ and Ni2+ through lateritic soil: Column experiments and transport modeling |
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| Srilert Chotpantarat,Say Kee Ong,Chakkaphan Sutthirat,Khemarath Osathaphan.Effect of pH on transport of Pb2+, Mn2+, Zn2+ and Ni2+ through lateritic soil: Column experiments and transport modeling[J].Journal of Environmental Sciences,2011,23(4):640-648. | |
| Authors: | Srilert Chotpantarat Say Kee Ong Chakkaphan Sutthirat and Khemarath Osathaphan |
| Institution: | 1. National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM),Chulalongkorn University, Bangkok 10330, Thailand;Department of Geology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10220, Thailand 2. Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA, USA 3. Department of Geology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10220, Thailand;Environmental Research Institute, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand 4. National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM),Chulalongkorn University, Bangkok 10330, Thailand;Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University,Phayathai Road, Pathumwan, Bangkok 10330, Thailand |
| Abstract: | This study investigated the effects of pH on the transport of Pb2+, Mn2+, Zn2+ and Ni2+ through lateritic soil columns. Model results by fitting the symmetric breakthrough curves (BTCs) of bromide (Br-) with CXTFIT model suggested that physical non-equilibrium processes were absent in the columns. The heavy metal BTCs were, however, asymmetrical and exhibited a tailing phenomenon,indicating the presence of chemical non-equilibrium processes in the columns. The retardation factors of Pb2+ were the largest of the four metal ions at both pH 4.0 (33.3) and pH 5.0 (35.4). The use of Langmuir isotherm parameters from batch studies with HYDRUS-1D did not predict the BTCs well. Rather the two-site model (TSM) described the heavy metal BTCs better than the equilibrium linear/nonlinear Langmuir model. The fraction of instantaneous sorption sites (f) of all four metal ions on the lateritic soil was consistently about 30%-44% of the total sorption sites. |
| Keywords: | pH e ect heavy metals HYDRUS-1D two-site model lateritic soil |
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