Wang Lili, Shen Zhenyao, Wang Hongyuan, Niu Junfeng, Lian Guoxi, Yang Zhifeng
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, PR China.
J Hazard Mater. 2009 Jun 15;165(1-3):441-6. doi: 10.1016/j.jhazmat.2008.10.016. Epub 2008 Oct 14.
The effects of aquatic sediment concentrations, grain size distribution and hydrodynamic conditions on sorption behavior of phenanthrene (PHE) on sediments collected from Yangtze River (Wuhan catchment) were investigated. The results showed that the sorption behavior of PHE was mainly affected by the organic carbon in different phases, i.e. organic carbon contents (f(oc)) (w/w, organic carbon/dry weight sediment) in the sediments and dissolved organic carbon (DOC) in liquid phase. In this study, sediments were subjected to artificial resuspension under turbulent diffusion coefficients being 24.6, 29.5 and 46.2 cm(2)s(-1) corresponded to 0.4, 0.3 and 0.2 s cycle(-1) of the perforated grids, respectively, which were driven by variable speed motor with 150, 180 and 280 rotation per minute (rpm). The suspended particle concentration increased from 1.01 to 6.70 g L(-1) as the hydrodynamic strength increased from 150 to 280 rpm, whereas PHE concentration in liquid phase decreased from 0.56 to 0.34 microg mL(-1). The amount of DOC was supposed to play an important role in the partition of PHE under hydrodynamic conditions. Moreover, a sorption dynamic model was developed based on the linear isotherm expression and law of conservation of mass. The model was validated by PHE sorption behavior acquired with three different hydrodynamic conditions and the predicted values displayed satisfying accordance with experimental data.
研究了长江（武汉流域）沉积物中水生沉积物浓度、粒度分布和水动力条件对菲（PHE）吸附行为的影响。结果表明，PHE的吸附行为主要受不同相中有机碳的影响，即沉积物中的有机碳含量（f(oc)）（w/w，有机碳/干重沉积物）和液相中的溶解有机碳（DOC）。在本研究中，沉积物在紊流扩散系数分别为24.6、29.5和46.2 cm²s⁻¹（分别对应于穿孔网格0.4、0.3和0.2 s周期⁻¹）的条件下进行人工再悬浮，这些条件由转速为150、180和280转/分钟（rpm）的变速电机驱动。随着水动力强度从150 rpm增加到280 rpm，悬浮颗粒浓度从1.01增加到6.70 g L⁻¹，而液相中PHE浓度从0.56降低到0.34 μg mL⁻¹。在水动力条件下，DOC的量被认为在PHE的分配中起重要作用。此外，基于线性等温线表达式和质量守恒定律建立了吸附动力学模型。该模型通过三种不同水动力条件下获得的PHE吸附行为进行了验证，预测值与实验数据显示出令人满意的一致性。
