Chung, Jaeshik Kim, Young-Jin Lee, Gwanghun Nam, Kyoungphile 2024-01-20T04:01:15Z 2024-01-20T04:01:15Z 2021-09-04 2016-07 0045-6535 https://pubs.kist.re.kr/handle/201004/123912 Competitive sorption and resulting nonequilibrium transport of Cu and Pb were investigated using slag as a primary sorbent. A series of estimation models were applied based on the equilibrium, and nonequilibrium sorption respectively, and finally calibrated by incorporating the experimentally determined batch kinetic data. When applied individually, the behavior of metals in slag-sand column were well predicted by both equilibrium and nonequilibrium models in CXTFIT code. However, coexisting Cu and Pb exhibited competition for sorption sites, generating an irregular breakthrough curves such as overshoot (higher concentration in effluent than the feed concentration) of Cu and corresponding earlier peak of Pb followed by gradual re-rising. Although two-site nonequilibrium model further considers coupled hydrochemical process, desorption of the Cu from competition made the model prediction inaccurate. However, the parameter estimation could be improved by incorporating the experimentally determined mass transfer rate, omega(exp) from batch kinetics. Based on the calibrated model, the fraction of instantaneous retardation, beta(exp) of Pb decreased from 0.41 in the single system to 030 in the binary system, indicating the shift from equilibrium to nonequilibrium state, where which of Cu increased from 0.39 to 0.94, representing the shift towards equilibrium. The modified results were also compared with five-step sequential extraction data, confirming that the shift of particular metal fractions from the competition triggered the nonequilibrium transport. (C) 2016 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD SEQUENTIAL EXTRACTION PROCEDURE PORE-WATER VELOCITY ORGANIC-CHEMICALS HEAVY-METALS MODEL USE SOILS BIOSORPTION CD CALIBRATION VALIDATION Experimental determination of nonequilibrium transport parameters reflecting the competitive sorption between Cu and Pb in slag-sand column Article 10.1016/j.chemosphere.2016.03.108 1 CHEMOSPHERE, v.154, pp.335 - 342 CHEMOSPHERE 154 335 342 scie scopus 000376693700043 2-s2.0-84962356035 Environmental Sciences Environmental Sciences & Ecology Article SEQUENTIAL EXTRACTION PROCEDURE PORE-WATER VELOCITY ORGANIC-CHEMICALS HEAVY-METALS MODEL USE SOILS BIOSORPTION CD CALIBRATION VALIDATION Competitive sorption CXTFIT Damkohler number Nonequilibrium transport Overshoot Sequential extraction