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Microscopic modeling of critical pressure of permeation in oily waste water treatment via membrane filtration

机译：通过膜过滤的油性废水处理渗透临界压力的显微镜模型

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摘要

Membrane pore blockage is a great concern during membrane processes in oily water treatment. In this paper, microfluidic science through the CFD technique was used to recognize this blocking mechanism. The behavior of a sample droplet was modeled on a membrane surface to observe the droplet deformation schematically. The theoretical torque balance and similar experimental data in the literature were applied to validate the modeling results. The critical permeation pressure concept was developed to enable quantitative study of membrane pore blockage. Subsequently, central composite design and the response surface methodology were employed for pressure modeling and optimization. Five variables were selected and studied, which resulted in critical pressures ranging from 5000 to 330 000 Pa. A quadratic model (R-2 = 0.99) for critical pressure was suggested, with maximization results under the optimum process conditions of 660 000 s(-1) shear rate, 0.01 N m(-1) surface tension, 120 degrees contact angle, 0.47 mm pore diameter and 1.44 mu m droplet diameter. CFD results under the optimum conditions predicted 355 kPa critical pressure, which is in 96.2% agreement with the quadratic correlation, representing the ability of this correlation to adjust trans-membrane pressure for the microfiltration of oil in water. On the other hand, the effectiveness order of the variables indicates that contact angle and interfacial tension are the most effective variables; therefore, the best remedy to overcome membrane fouling is membrane surface treatment by increased hydrophilicity along with an increase in interfacial tension.
机译：膜孔隙堵塞是油性水处理中膜过程中的一个很好的关注。在本文中，通过CFD技术进行了微流体科学来识别该阻塞机构。样品液滴的行为在膜表面上建模，以示意性地观察液滴变形。应用文献中的理论扭矩平衡和类似的实验数据来验证建模结果。临界渗透压力概念是开发的，以实现膜孔隙堵塞的定量研究。随后，采用中央复合设计和响应面方法进行压力建模和优化。选择并研究了五个变量，导致临界压力范围为5000至330 000 pa。提出了对临界压力的二次模型（R-2 = 0.99），最大化结果在660 000 s（ - 1）剪切速率，0.01 n m（-1）表面张力，120度接触角，孔径为0.47mm孔径和1.44μm液滴直径。 CFD结果在最佳条件下预测了355 kPa临界压力，其与二次相关的达96.2％，代表这种相关性以调节水中微滤的横膜压力的能力。另一方面，变量的有效性顺序表明接触角和界面张力是最有效的变量;因此，克服膜污染的最佳补救措施是通过增加亲水性以及界面张力的增加来处理膜表面处理。

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  • 来源
    《RSC Advances》 |2016年第75期|共13页
  • 作者

    Monfared Maryam Abbasi; Kasiri Norollah; Mohammadi Toraj;

  • 作者单位

    Iran Univ Sci &

    Technol Comp Aided Proc Engn Lab Sch Chem Engn Tehran Iran;

    Iran Univ Sci &

    Technol Comp Aided Proc Engn Lab Sch Chem Engn Tehran Iran;

    Iran Univ Sci &

    Technol Res Lab Separat Proc Sch Chem Engn Tehran Iran;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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