Reclaimation of heavy metal contaminated soil using synthesized zeolite (III)
|作者:||林正芳||關鍵字:||合成沸石;土壤重金屬;穩定化;線性迴歸;平衡等溫吸附;Freundlich 吸附方程式;一維傳輸模式;synthesized zeolite;heavy metal in soil;stabilization;linear regression;adsorption isotherm;Freundlich equation Model||公開日期:||31-七月-1998||出版社:||臺北市：國立臺灣大學環境工程學研究所||摘要:||本研究旨在探討及量化合成沸石穩定
This research investigated the effect of synthesized zeolite on stabilizing Cd, Cu, and Zn contaminated soil and also developed model for simulating metal transport in soil columns. The experimental work addressed adsorption equilibrium of metals on soils, metal leaching from soil columns, and metal transport model in soil environment. Specifically, four soil samples, Pinchen,Jente, Erlin, and Chengchung, were obtained as representatives of local soil series. In batch adsorption experiments, metals in solution phase will compete for the reacting sites in soil surfaces. In system containing all three metal ions, Cu preferentially outcompetes Zn and Cd for sorption on soils. Sorption of Cd exhibits the weakest affinity for the surface reactions. Thus, in the presence of Cu and Zn, the sorption density of Cd is dramatically reduced by the competition among metals. Adding zeolite in soil mixtures will greatly enhance the holding capability of soils on metals, specifically Cd on Jente soil samples. However, zeolite addition provides less significant effect on Cu as well as Zn sorption. The effects of zeolite addition on metal sorption onto soils can be modeled using Freundlich isotherm by considering the alternation of soil cation change capacity (CEC). The linear relationship between Freundlich adsorption constant K and soil CEC at various zeolite addition was developed. This linear equation is very useful in predicting adsorption ability of soil with some amounts of zeolite addition in terms of Freundlich K. Thereafter, the parameters necessary for pollutant advection-dispersion-adsorption model is obtainable. The model is then used for simulating Cd (30 mg/kg-soil) , Cd, and Zn (300 mg/kg-soil) migration in zeolite amended soil columns. The model outputs provides reasonable data for understanding the reaction as well as metal transport in soil column, especially for metal contamination level in the range of 30 to 300 mg/kg-soil. Nevertheless, this model was unable to offer acceptable results for the system with high metal concentration such as 100 mg-Cd/kgsoil and 1000 mg-Cu-Zn/kg-soil.
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