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首页> 外文期刊>Water Science and Technology >Study of cyanide wastewater treatment by dispersion supported liquid membrane using trioctylamine and kerosene as liquid membrane
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Study of cyanide wastewater treatment by dispersion supported liquid membrane using trioctylamine and kerosene as liquid membrane

机译：三辛胺和煤油为液膜的分散负载液膜处理氰化物废水的研究

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A certain amount of cyanide is present in wastewater of various industrial processes, such as wet extraction of gold, coal processing, electroplating and other industries. In this work, an experimental study regarding transport of cyanide through a dispersion supported liquid membrane was performed. A model was established to describe the reaction and transport of CN(I) in the supported liquid membrane and the mass transfer kinetics equations were deduced. Through mass transfer kinetic equation it was derived that, when the carrier concentration was under certain conditions, there was a linear relationship between the reciprocal of the permeability coefficient of CN(I) (1/P-c) and n-th power of the concentration of H+ (c(H+)(n)), and the parameters Delta(a)(delta(a)/da) and Delta(o)(d(o)/d(o)) could be obtained from the slope and intercept of the straight line. Then the diffusion coefficient d(o) and the diffusion layer thickness delta(o) of the phase interface between the feed phase and membrane phase could be calculated. Factors affecting migration of CN(I) were analyzed, and the stable removal rate of CN(I) was more than 90% with carrier concentration (%TOA) of 2%, feed phase pH of 4, initial CN(I) concentration of 30 mg/L, stirring time of 1 hour, volume ratio of membrane solution to NaOH solution of 2: 1, strip phase concentration of 2 mol/L. The results showed that the overall mass transfer rate increased first and then decreased with an increase of TOA concentration, organic-to-strip volume ratio, and strip concentration. Furthermore, the transport percentage of CN(I) was increased, the stability of membrane was enhanced, and the lifetime of the membrane was extended.
机译：各种工业过程的废水中都存在一定量的氰化物，例如湿法提取金，煤炭加工，电镀和其他工业。在这项工作中，进行了有关氰化物通过分散负载的液膜传输的实验研究。建立了描述CN（I）在负载液膜中的反应和迁移的模型，推导了传质动力学方程。通过传质动力学方程推导，当载流子浓度在一定条件下时，CN（I）（1 / Pc）渗透系数的倒数与浓度的n次方成线性关系。可以从斜率和截距获得H +（c（H +）（n））和参数Delta（a）（delta（a）/ da）和Delta（o）（d（o）/ d（o））直线。然后可以计算进料相和膜相之间的相界面的扩散系数d（o）和扩散层厚度delta（o）。分析了影响CN（I）迁移的因素，当载体浓度（％TOA）为2％，进料相pH为4时，CN（I）的初始去除率稳定在90％以上。 30 mg / L，搅拌时间1小时，膜溶液与NaOH溶液的体积比为2：1，汽提相浓度为2 mol / L。结果表明，总体传质速率随TOA浓度，有机物与条带的体积比和试纸浓度的增加先增加然后减少。此外，CN（I）的转运百分比增加，膜的稳定性增强，并且膜的寿命延长。

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