Fluid-flow models operating on linear algebra for extraction and stripping of silver ions from pharmaceutical wastewater by HFSLM
Fluid-flow models operating on linear algebra for extraction and stripping of silver ions from pharmaceutical wastewater by HFSLM
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DOI：
10.1016/j.cej.2013.02.091
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发表时间：
2013-04
影响因子：
15.1
通讯作者：
Thidarat Wongsawa;N. Leepipatpiboon;Nopphawat Thamphiphit;U. Pancharoen;A. Lothongkum
中科院分区：
文献类型：
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作者：
Thidarat Wongsawa;N. Leepipatpiboon;Nopphawat Thamphiphit;U. Pancharoen;A. Lothongkum
研究了中空纤维支撑液膜（HFSLM）对银离子的萃取和反萃。以含银离子30 mg/dm 3的制药废水为料液。LIX 84-I溶解在煤油中，和硫代硫酸钠五水合物溶液分别用作液膜和反萃溶液。考察了各种因素对银离子萃取和反萃的影响。流体流动模型更准确地描述传输的银离子从进料相反萃取相开发。用线性代数方法对模型进行了计算。模型中考察的参数包括两侧的轴向对流和轴向扩散、料液膜和液膜反萃界面的化学反应以及体系中银离子的积累。确定了液膜中的传质系数（km）用于模型。进料相和反萃相中银离子的最终预测浓度成功地与实验数据一致。表明流体流动模型可以准确地估计中空纤维内外对应的轴向对流、轴向扩散、料液膜和液膜-汽提界面反应的银离子传输。根据这项调查，HFSLM显示了实际意义，用于制药废水处理。
The extraction and stripping of silver ions by hollow fiber supported liquid membrane (HFSLM) was examined. Pharmaceutical wastewater containing 30mg/dm3of silver ions was used as the feed solution. LIX 84-I dissolved in kerosene, and sodium thiosulfate pentahydrate solution were used as the liquid membrane and stripping solution, respectively. The influences of several variables on the extraction and stripping of silver ions were investigated. Fluid-flow models for greater accuracy in describing the transport of silver ions from feed phase to stripping phase were developed. The models were calculated by linear algebra. The investigated parameters in the models were axial convections and axial diffusions on both sides, chemical reactions at the feed-liquid membrane and liquid membrane-stripping interfaces as well as the accumulation of silver ions in the system. The mass transfer coefficient in the liquid membrane (km) was determined for use in the models. The final predicted concentrations of silver ions in feed and stripping phases were successfully in agreement with the experimental data. It indicates that the fluid-flow model can accurately estimate the transport of silver ions inside and outside the hollow fibers corresponding to the axial convections, axial diffusions, reactions at the feed-liquid membrane and liquid membrane-stripping interfaces. In accordance with this investigation, the HFSLM shows a practical implication for the use in pharmaceutical wastewater treatment.