Analysis of an ultrafiltration model: Influence of operational conditions

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• 作者：Marí ; a-Cinta Vincent-Vela^a ; Beatriz Cuartas-Uribe^a ; Silvia Á ; lvarez-Blanco ;   ; ^a ;   ; ^{sialvare@iqn.upv.es} ; Jaime Lora-Garcí ; a^a
• 关键词：Model ; Ultrafiltration ; Initial membrane fouling resistance ; Gel layer
• 刊名：Desalination
• 出版年：2012
• 出版时间：4 January 2012
• 年：2012
• 卷：284
• 期：Complete
• 页码：14-21
• 全文大小：404 K

文摘

Ultrafiltration is a widely used technique to remove hazardous pollutants from wastewaters. As ultrafiltration is a dynamic process, non steady-state UF models have been widely investigated and described in the literature. The main equations of most dynamic models found in the literature can be rearranged and simplified into a linear equation. In this work, experimental results from UF tests were expressed in terms of TMP²/J_P² as a function of time to check linearity. Transmembrane pressure (TMP), feed concentration (FC), temperature and crossflow velocity (CFV) were varied during the experiments. The feed consisted in an aqueous solution of polyethylene glycol of 35 kg/mol molecular weight. The experimental results confirmed a linear relationship when TMP²/J_P² was plotted vs. time. For severe fouling conditions, the linearity found when plotting experimental values of initial membrane fouling resistance vs. TMP was very high. A linear correlation between the initial membrane fouling resistance and the temperature was also found for the experimental conditions tested. However, it was found that, above 25 ¡ãC, increasing temperature did not result in a noticeable reduction of the gel layer resistance. The quotient r_c/c_g as a function of TMP and CFV was also evaluated to check if it followed any pattern.