Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 23, Issue 4, Pages 640-648Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(10)60417-2
Keywords
pH effect; heavy metals; HYDRUS-1D; two-site model; lateritic soil
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Funding
- National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM)
- Geology Department of Chulalongkorn University
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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.
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