Publication Date:
2014-12-21
Description:
Non-equilibrium and non-linear sorption of the contaminants in the fractured porous media could significantly influence the shape of the breakthrough curve (BTC). For the fracture-matrix system there are very few studies which consider these processes. In this study, the non-equilibrium fracture-matrix model with two different non-linear sorption isotherms, namely non-linear Freundlich and Langmuir sorption isotherms were developed. The effect of sorption non-linearity and non equilibrium conditions on the shape of the BTC was studied using the temporal moments. The developed models along with the linear equilibrium, linear non-equilibrium fracture matrix models and the multi rate mass transfer model were used to simulate the BTC, which were compared with the experimental data available in the literature. Both sorption non-equilibrium and non-linearity were found to significantly influence the shape of the BTC. Presence of sorption non-linearity reduces the solute spreading, whereas presence of non-equilibrium conditions increases the solute spreading. Considering the sorption non-equilibrium along with the sorption non-linearity leads to an improved simulation of the BTC. The non-equilibrium non-linear sorption models could simulate the extended BTC tailing resulting from sorption non-linearity and rate limited interaction in the fracture-matrix system. This article is protected by copyright. All rights reserved.
Print ISSN:
0043-1397
Electronic ISSN:
1944-7973
Topics:
Architecture, Civil Engineering, Surveying
,
Geography
