The sedimentation probability model based on the particle size distribution and cake morphology in the cross-flow membrane process

IF 4.1 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2025-02-01 DOI:10.1016/j.ces.2024.121045

Ge Hu, Zhan Wang

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引用次数: 0

Abstract

Evolution of non-uniform cake structure in the cross-flow membrane process was investigated in this study. Considering the real cake surface morphology and particle size distribution, the sedimentation probability of foulant (γ) was calculated, then a new flux prediction model based on the mass conservation on the cake surface was proposed. Results showed that the predictions of the new model had excellent agreements with experimental data (R² > 0.97), wherein cake surface heights obeyed normal distribution and protrusion heights approximately obeyed exponential distribution. Meanwhile, γ decreased with cross-flow velocity from 4.59 % (0.24 m/s) to 2.53 % (0.48 m/s), whereas γ increased with trans-membrane pressure from 2.80 % (0.1 MPa) to 6.44 % (0.2 MPa). In addition, a skin layer which was approximately about 20 % of total cake thickness but possessed 70 % of the total resistance, was also observed in the cross-flow mode. These results provided a brand-new perspective (tuning cake morphology or structure) on the essence of membrane fouling alleviation.

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基于粒径分布和滤饼形态的横流膜工艺沉降概率模型

研究了跨流膜过程中不均匀饼状结构的演变。考虑实际滤饼表面形貌和粒径分布，计算了杂质（γ）的沉降概率，提出了一种基于滤饼表面质量守恒的通量预测模型。结果表明，新模型的预测结果与实验数据吻合良好（R2 >； 0.97），其中饼面高度服从正态分布，突出高度近似服从指数分布。同时，γ随跨膜压力从2.80 %（0.1 MPa）增加到6.44 %(0.2 MPa)， γ随跨膜流速从4.59 %（0.24 m/s）减少到2.53 %（0.48 m/s）。此外，在交叉流模式下，还观察到约占饼总厚度20% %的皮层，但具有70 %的总阻力。这些结果提供了一个全新的视角（调整饼的形态或结构），以缓解膜污染的本质。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.