Effects of pH on the leaching mechanisms of elements from fly ash mixed soils
作者： Kanokwan Komonweeraket , Bora Cetin , Ahmet H. Aydilek , Craig H. Benson , Tuncer B. Edil
DOI: 10.1016/J.FUEL.2014.09.068
关键词: Fly ash 、 Leachate 、 Geochemical modeling 、 Chemistry 、 Dissolved organic carbon 、 Leaching (metallurgy) 、 Soil water 、 Hydroxide 、 Organic matter 、 Environmental chemistry
摘要: Abstract A laboratory pH-dependent batch water leach tests were conducted to investigate the leaching behavior of Al, Zn, Cr, Cu, Fe and Mn from soil–fly ash mixtures used in highway constructions under influence pH. Soil fly prepared six different soils (clayey sand) seven ashes (C-type high carbon ash) collected Wisconsin, Minnesota Maryland. showed cationic patterns where concentrations decreased monotonically as pH increased, while Fe, Zn amphoteric these metals increased at acidic alkaline An increase content leached metal mineral mixtures. Consistency for many elements was observed between High concentration dissolved organic leachate likely responsible Cu with soil having matter. The Geochemical Model MINTEQA2 determine dominant oxidation states define their controlling mechanisms. results geochemical modeling analyses indicated that releases solubility-controlled. For a given element, solubility-controlling solids found be very consistent. Oxide hydroxide minerals control controlled by oxide and/or carbonate minerals.
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