The Characteristic Analysis of Interrupted Flow Pulsation on Ultrafiltration System

2013 ◽  
Vol 479-480 ◽  
pp. 373-379
Author(s):  
Chyouhwu Huang ◽  
Hung Shyong Chen
Keyword(s):  
Concentration Polarization ◽  
Fruit Juice ◽  
Membrane Separation ◽  
Industrial Applications ◽  
Membrane Module ◽  
Characteristic Analysis ◽  
Oil Water ◽  
Concentration Polarization Layer ◽  
Interrupted Flow ◽  
Macromolecular Solution

Ultrafiltration (UF) process has been widely used in many industrial applications to separate or concentrate macromolecular solution such as the making of fruit juice, the separation of oil-water emulsions, the treatment effluents from the pulp and paper, and environmental protecting applications. However, this process exhibits a limiting flux behavior caused by concentration polarization and consequently reduces the life of the membrane module. Concentration polarization can be especially severe in macromolecular solutions due to low diffusivity in membrane separation. In this study, we introduce an interrupted pulsatile flow to improve the performance of the membrane and decrease the concentration polarization layer. This method involves pulsing the feed flow discontinuously. Our results show that this method can be applied to membrane module regardless of it geometry and materials. Also, when comparing with un-pulsatile module, this could further leader to the improvement of membrane life. Keywords: ultrafiltation, interrupted - pulsating flow, concentration polarization, limiting flux behavior

The Effect of Flow Pulsation on Ultrafiltration System Limiting Flux Behavior

2013 ◽  
Author(s):  
Chyouhwu Brian Huang ◽  
Hung-Shyong Chen
Keyword(s):  
Membrane Filtration ◽  
Concentration Polarization ◽  
Membrane Separation ◽  
Membrane Surface ◽  
Paper Industry ◽  
Surface Concentration ◽  
Permeate Flux ◽  
Filtration Time ◽  
Protection Systems ◽  
Oil Water

Ultrafiltration (UF) is an important industrial operation and is found in the food industry, separation of oil-water emulsions, treatment effluents from the pulp and paper industry, and environmental protection systems. Despite being widely used in these areas, UF systems exhibit a limiting flux behavior caused by concentration polarization on the membrane surface. Concentration polarization can be severe in macromolecular solutions due to low diffusivity on membrane separation and both mechanical and chemical methods have been used to reduce this phenomenon. This study introduces a new mechanical method that improves the performance of membrane separation and decreases concentration polarization. It involves pulsing the feed flow discontinuously and based on our results, feed flow velocity and solution bypass/membrane filtration time ratio are two vital factors when it comes to improving permeate flux. The proposed method is expected to find wide application, particularly in the processing of macromolecular solution.

scholarly journals The Effect of the Concentration Polarization and the Membrane Layer Mass Transport on the Membrane Separation

2017 ◽  
Vol 6 (1) ◽  
Author(s):  
Endre Nagy ◽  
Gábor Borbély
Keyword(s):  
Boundary Layer ◽  
Mass Transport ◽  
Concentration Polarization ◽  
Membrane Separation ◽  
Separation Efficiency ◽  
Enrichment Factors ◽  
Transport Parameters ◽  
Membrane Layer ◽  
Negative Effect ◽  
Concentration Polarization Layer

The negative effect of the concentration polarization layer on the membrane separation is well known. How the mass transport parameters of the membrane matrix, e.g. the solubility coefficient, membrane Peclet number, can affect the concentration profile of the boundary layer, and consequently, the separation efficiency is not investigated in detail yet. This paper gives the suitable mathematical expressions, in order to predict the well known parameters as polarization modulus, enrichment factors, etc., taking into account the transport parameters for both the concentration boundary and the membrane layers, and analyses the concentration distribution and the polarization modulus. It has been shown that the transport properties of the membrane layer have significant effect on the concentration profiles of the boundary layer and thus, on the polarization modulus, enrichment factors, etc., as well. Thus, the well known equations, e.g. the polarization modulus, enrichment factor given in the literature [see e.g. Equations (2) and (3)], could be considered as approaches.

A Wall Film Model for Membrane Fouling

2018 ◽  
Author(s):  
Sina Jahangiri Mamouri ◽  
Volodymyr V. Tarabara ◽  
André Bénard
Keyword(s):  
Multiphase Flow ◽  
Membrane Fouling ◽  
Oil And Gas ◽  
Membrane Separation ◽  
Film Formation ◽  
Membrane Surface ◽  
Permeate Flux ◽  
Water Separation ◽  
Wall Film ◽  
Oil Water

Deoiling of produced or impaired waters associated with oil and gas production represents a significant challenge for many companies. Centrifugation, air flotation, and hydrocyclone separation are the current methods of oil removal from produced water [1], however the efficiency of these methods decreases dramatically for droplets smaller than approximately 15–20 μm. More effective separation of oil-water mixtures into water and oil phases has the potential to both decrease the environmental footprint of the oil and gas industry and improve human well-being in regions such as the Gulf of Mexico. New membrane separation processes and design of systems with advanced flow management offer tremendous potential for improving oil-water separation efficacy. However, fouling is a major challenge in membrane separation [2]. In this study, the behavior of oil droplets and their interaction with crossflow filtration (CFF) membranes (including membrane fouling) is studied using computational fluid dynamics (CFD) simulations. A model for film formation on a membrane surface is proposed for the first time to simulate film formation on membrane surfaces. The bulk multiphase flow is modeled using an Eulerian-Eulerian multiphase flow model. A wall film is developed from mass and momentum balances [3] and implemented to model droplet deposition and membrane surface blockage. The model is used to predict film formation and subsequent membrane fouling, and allow to estimate the actual permeate flux. The results are validated using available experimental data.

Effect of concentration polarization on hydrogen production performance of ceramic-supported Pd membrane module

2015 ◽  
Vol 40 (35) ◽  
pp. 11451-11456 ◽  
Author(s):  
Tatsuya Nakajima ◽  
Takao Kume ◽  
Yoichi Ikeda ◽  
Masahiro Shiraki ◽  
Hideto Kurokawa ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Concentration Polarization ◽  
Membrane Module ◽  
Production Performance ◽  
Pd Membrane ◽  
Supported Pd

scholarly journals Bibliometric approach to the perspectives and challenges of membrane separation processes to remove emerging contaminants from water

2020 ◽  
Vol 82 (9) ◽  
pp. 1721-1741
Author(s):  
Jéssica Stefanello Cadore ◽  
Lucas Fernando Fabro ◽  
Thuany Garcia Maraschin ◽  
Nara Regina de Souza Basso ◽  
Marçal José Rodrigues Pires ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Treatment ◽  
Emerging Contaminants ◽  
Membrane Separation ◽  
High Surface ◽  
High Surface Area ◽  
Industrial Applications ◽  
Mechanical Resistance ◽  
Separation Processes ◽  
Research Attention

Abstract The presence of contaminants in water is concerning due to the potential impacts on human health and the environment, and ingested contaminants cause harm in various ways. The conventional water treatment systems are not efficient to remove these contaminants. Therefore, novel techniques and materials for the removal of contaminants are increasingly being developed. The separation process using modified membranes can remove these micropollutants; therefore, they have attracted significant research attention. Among the materials used for manufacturing of these membranes, composites based on graphene oxide and reduced graphene oxide are preferred owing to their promising properties, such as mechanical resistance, thermal and chemical stability, antifouling capacity, water permeability, high thermal and electrical conductivity, high optical transmittance and high surface area. Membrane separation processes (MSP) can be used as secondary or tertiary treatment during the supply of wastewater. However, the efficient and accessible applications of these technologies are challenging. This study aims to demonstrate the main concepts of membrane separation processes and their application in the removal of emerging contaminants. This study reports bibliometric mapping, relevant data on studies using membranes as water treatment processes, and their viability in industrial applications. The main challenges and perspectives of these technologies are discussed in detail as well.

Fluoropolymers for oil/water membrane separation

2020 ◽  
pp. 209-246
Author(s):  
Roberta Bongiovanni ◽  
Emanuele Nettis ◽  
Alessandra Vitale
Keyword(s):  
Membrane Separation ◽  
Oil Water

Methods to Reduce Concentration Polarization and Fouling in Membrane Filtration

1994 ◽  
Vol 59 (4) ◽  
pp. 737-755 ◽  
Author(s):  
Petr Mikulášek
Keyword(s):  
Membrane Filtration ◽  
Morphological Analysis ◽  
Concentration Polarization ◽  
Membrane Separation ◽  
Separation Processes ◽  
Membrane Modules

Various methods and concepts that are currently being used and proposed to control or minimize concentration polarization and fouling in membrane separation processes are reviewed. A morphological analysis of hydrodynamic ways to prevent the detrimental influence on fluxes is given. The potentials of these different approaches are analyzed and some examples of module designs resulting from the various approaches with special attention to rotary membrane modules are given.

Non-Negligible Diffusio-Osmosis Inside an Ion Concentration Polarization Layer

2016 ◽  
Vol 116 (25) ◽  
Author(s):  
Inhee Cho ◽  
Wonseok Kim ◽  
Junsuk Kim ◽  
Ho-Young Kim ◽  
Hyomin Lee ◽  
...  
Keyword(s):  
Concentration Polarization ◽  
Ion Concentration ◽  
Ion Concentration Polarization ◽  
Concentration Polarization Layer

A concentration-independent micro/nanofluidic active diode using an asymmetric ion concentration polarization layer

Nanoscale ◽  
2017 ◽  
Vol 9 (33) ◽  
pp. 11871-11880 ◽  
Author(s):  
Hyekyung Lee ◽  
Junsuk Kim ◽  
Hyeonsoo Kim ◽  
Ho-Young Kim ◽  
Hyomin Lee ◽  
...  
Keyword(s):  
Concentration Polarization ◽  
Ion Concentration ◽  
Wide Concentration Range ◽  
Convective Flows ◽  
New Class ◽  
Ion Concentration Polarization ◽  
Selective Membrane ◽  
Rectification Factor ◽  
Concentration Polarization Layer

The new class of micro/nanofluidic diodes with an ideal perm-selective membrane were demonstrated at a wide concentration range from 10−5 M to 3 M. Moreover, the rectification factor was actively controlled by adjusting the external convective flows.

Preparation of Membrane Zeolite MCM-22 and Evaluation Process Oil/Water Separation

2015 ◽  
Vol 820 ◽  
pp. 605-608
Author(s):  
A. Santos Barbosa ◽  
A.S. Barbosa ◽  
M.G.F. Rodrigues
Keyword(s):  
Continuous Flow ◽  
Membrane Separation ◽  
Secondary Growth ◽  
Evaluation Process ◽  
Zeolite Membrane ◽  
Water Separation ◽  
Oil Emulsion ◽  
X Ray ◽  
Growth Method ◽  
Oil Water

The objective of this work was prepared by secondary growth method, and evaluate the ability of the MCM-22 zeolite membrane separation system in oil / water in a continuous flow system. The zeolite membrane MCM-22 was characterized by different techniques: X-Ray Spectrometry Energy Dispersive (EDX), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). A continuous flow was used. The test for measuring mass flow of water / oil emulsion was conducted in peristaltic pump, wherein the membrane zeolite MCM-22 was tested. Through the results, we can observe the efficiency of the method used in the preparation of zeolite membrane and was also observed that the zeolite MCM-22 membrane, obtained by secondary growth method showed removal percentages equivalent to the standards required by Resolution 392 CONAMA.

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