Zakari Sissou, Liu Hui, Tong Lei, Wang Yan, Liu Jianfeng
State Key Laboratory of Biogeology and Environmental Geology and School of Environmental Studies, China University of Geosciences, Wuhan 430074, PR China.
State Key Laboratory of Biogeology and Environmental Geology and School of Environmental Studies, China University of Geosciences, Wuhan 430074, PR China.
Chemosphere. 2016 Feb;144:1807-14. doi: 10.1016/j.chemosphere.2015.10.081. Epub 2015 Nov 11.
The present paper aims to study the transport behavior of bisphenol-A (BPA) in sandy aquifer so as to provide important parameters for the prediction and control of contaminant plume in aquifer. Miscible displacement experiments were conducted and the breakthrough curves (BTCs) were simulated using HYDRUS-1D software. The effects of pore-water velocity (10-52 cm h(-1)) and initial concentration (2.5-40 mg L(-1)) on the sorption were also investigated. The BTCs of BPA fit the linear first-order non-equilibrium two-site model. The parameters such as partition coefficient (K(d)), the fraction of instantaneous adsorption on "Type-1" sites (F), the first order sorption rate coefficient for the kinetic non-equilibrium (type-2) sites (α), the retardation coefficient (R), and sorption capacity (q(column)) were computed. Results showed that BPA transported 0.11-0.83 m with various pore water velocity in sandy sediment column when water flowed 1 m. The sorption of BPA was mainly caused by the instantaneous surface adsorption as F varied from 0.596 to 0.908. The transport velocity of BPA was affected by pore water velocity (v) and followed the linear equation 1/R = 0.0600 + 0.0110v (r(2) = 0.9724). The parameter K(d) were also closely related to v and followed the equation LnK(d) = 1.0023-0.0482v (r(2) = 0.9690). The sorption capacity was more related to the initial BPA concentration (C0) and followed the linear equation q(column) = 0.265 + 0.253C0 (r(2) = 0.9727). The parameter α was affected by both v and C0 whereas F was not dramatically affected by both.
本文旨在研究双酚A（BPA）在砂质含水层中的迁移行为，以便为含水层中污染物羽流的预测和控制提供重要参数。进行了混溶驱替实验，并使用HYDRUS-1D软件模拟了突破曲线（BTCs）。还研究了孔隙水速度（10 - 52 cm h(-1)）和初始浓度（2.5 - 40 mg L(-1)）对吸附的影响。BPA的BTCs符合线性一阶非平衡双位点模型。计算了分配系数（K(d)）、“1型”位点上瞬时吸附的分数（F）、动力学非平衡（2型）位点的一阶吸附速率系数（α）、阻滞系数（R）和吸附容量（q(column)）等参数。结果表明，当水流过1 m时，BPA在砂质沉积柱中随不同孔隙水速度迁移了0.11 - 0.83 m。由于F在0.596至0.908之间变化，BPA的吸附主要由瞬时表面吸附引起。BPA的迁移速度受孔隙水速度（v）影响，并遵循线性方程1/R = 0.0600 + 0.0110v（r(2) = 0.9724）。参数K(d)也与v密切相关，并遵循方程LnK(d) = 1.0023 - 0.0482v（r(2) = 0.9690）。吸附容量与初始BPA浓度（C0）的关系更大，并遵循线性方程q(column) = 0.265 + 0.253C0（r(2) = 0.9727）。参数α受v和C0两者影响，而F不受两者显著影响。
