Authors: Sissou Zakari Hui Liu YanXi Li Xi He Lei Tong
Publish Date: 2016/05/04
Volume: 23, Issue: 15, Pages: 15749-15756
Abstract
This work aimed to quantify the transport and sorption behavior of four individual phthalate esters PAEs in sandy aquifer using column experiments so as to provide important parameters for the prediction and control of PAEs pollution plume in groundwater system The transport curves of four individual PAEs were simulated with HYDRUS1D through fitting linear and nonlinear equilibrium LE/NO linear and nonlinear firstorder onesite nonequilibrium LO/NO linear and nonlinear firstorder twosite nonequilibrium LFO/NFO sorption models Simulation results showed that twosite models LFO and NFO displayed similar best fittings The results from LFO model simulation showed that when water flowed 1000 m in sandy aquifer PAEs with shorter carbon chains DMP and DEP transport 316 and 222 m respectively Unexpectedly for the same water transport distance PAEs with longer carbon chains DBP and DiBP transported 402 and 607 m respectively which were faster than DMP and DEP mainly due to the limited accessibility of type2 sorption sites The retardations were mainly caused by the sorption of PAEs on the timedependent type2 sites DBP and DiBP exhibited higher mass transfer speed to and fro type2 sites but showed lower total sorption coefficient K due to the limited accessibility of sorption sites Coexistence of PAEs and smaller sorbent particles increased total K values of DBP and DiBP due to synergic development of more sorption sites with DMP and DEP
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