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Reduction of membrane fouling by innovative method (injection of air jet)

BACKGROUND: One of the most important challenges about the Membrane Bio Reactors is membrane fouling. Fouling has been at the centre of a globe debate for more recent years. It leads to high operational and maintenance costs such as membrane damage and replacement of membrane. Membrane fouling is at...

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Autores principales: Amiraftabi, Maryam-Sadat, Mostoufi, Navid, Hosseinzadeh, Mostafa, Mehrnia, Mohammad-Reza
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4236437/
https://www.ncbi.nlm.nih.gov/pubmed/25411641
http://dx.doi.org/10.1186/s40201-014-0128-0
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author Amiraftabi, Maryam-Sadat
Mostoufi, Navid
Hosseinzadeh, Mostafa
Mehrnia, Mohammad-Reza
author_facet Amiraftabi, Maryam-Sadat
Mostoufi, Navid
Hosseinzadeh, Mostafa
Mehrnia, Mohammad-Reza
author_sort Amiraftabi, Maryam-Sadat
collection PubMed
description BACKGROUND: One of the most important challenges about the Membrane Bio Reactors is membrane fouling. Fouling has been at the centre of a globe debate for more recent years. It leads to high operational and maintenance costs such as membrane damage and replacement of membrane. Membrane fouling is attributed to the physicochemical interactions between the bio fluid and membrane. In order to decrease the fouling in bioreactors there are common anti fouling strategies such as operation at low flux, Optimization of aeration flow-rate and Physical and chemical cleanings. However, often they are not effective. METHODOLOGY: This work deal with fouling crisis by a new and innovative method in order to reduce of fouling on membrane surface by injection of parallel air jet on membrane bio reactor. This is a new idea and fundamental study about the influence of wall jet on fouling of membrane surface. This study is included both experimental and numerical investigations. In order to polarize the stream path on the surface of the membrane, four symmetric nozzles were implemented at the bottom of the membrane surface upon the sparger. The changes in the fouling resistance were experimentally measured at five various jet velocities and all of them recorded by a computer system. In addition the effect of air jet velocity and shear stress on fouling resistances was also investigated by computational fluid dynamics at the similar conditions. RESULTS: It was revealed that the permeate flux and resistance of fouling can be related to shear stress of air flow at the membrane surface. When the velocity of air jets increase, the permeate flux increase too. Also, results illustrate that jet injection can partially remove the cake which was formed on the surface of the membrane. CONCLUSIONS: Correlations were developed for estimating each resistance of the membrane surface via the shear stress. The resistances of the cake are removed by the jet velocity changes, from 20% in lower jet velocity up to 40% in higher jet velocity.
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spelling pubmed-42364372014-11-19 Reduction of membrane fouling by innovative method (injection of air jet) Amiraftabi, Maryam-Sadat Mostoufi, Navid Hosseinzadeh, Mostafa Mehrnia, Mohammad-Reza J Environ Health Sci Eng Research Article BACKGROUND: One of the most important challenges about the Membrane Bio Reactors is membrane fouling. Fouling has been at the centre of a globe debate for more recent years. It leads to high operational and maintenance costs such as membrane damage and replacement of membrane. Membrane fouling is attributed to the physicochemical interactions between the bio fluid and membrane. In order to decrease the fouling in bioreactors there are common anti fouling strategies such as operation at low flux, Optimization of aeration flow-rate and Physical and chemical cleanings. However, often they are not effective. METHODOLOGY: This work deal with fouling crisis by a new and innovative method in order to reduce of fouling on membrane surface by injection of parallel air jet on membrane bio reactor. This is a new idea and fundamental study about the influence of wall jet on fouling of membrane surface. This study is included both experimental and numerical investigations. In order to polarize the stream path on the surface of the membrane, four symmetric nozzles were implemented at the bottom of the membrane surface upon the sparger. The changes in the fouling resistance were experimentally measured at five various jet velocities and all of them recorded by a computer system. In addition the effect of air jet velocity and shear stress on fouling resistances was also investigated by computational fluid dynamics at the similar conditions. RESULTS: It was revealed that the permeate flux and resistance of fouling can be related to shear stress of air flow at the membrane surface. When the velocity of air jets increase, the permeate flux increase too. Also, results illustrate that jet injection can partially remove the cake which was formed on the surface of the membrane. CONCLUSIONS: Correlations were developed for estimating each resistance of the membrane surface via the shear stress. The resistances of the cake are removed by the jet velocity changes, from 20% in lower jet velocity up to 40% in higher jet velocity. BioMed Central 2014-11-14 /pmc/articles/PMC4236437/ /pubmed/25411641 http://dx.doi.org/10.1186/s40201-014-0128-0 Text en © Amiraftabi et al.; licensee BioMed Central Ltd. 2014 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
Amiraftabi, Maryam-Sadat
Mostoufi, Navid
Hosseinzadeh, Mostafa
Mehrnia, Mohammad-Reza
Reduction of membrane fouling by innovative method (injection of air jet)
title Reduction of membrane fouling by innovative method (injection of air jet)
title_full Reduction of membrane fouling by innovative method (injection of air jet)
title_fullStr Reduction of membrane fouling by innovative method (injection of air jet)
title_full_unstemmed Reduction of membrane fouling by innovative method (injection of air jet)
title_short Reduction of membrane fouling by innovative method (injection of air jet)
title_sort reduction of membrane fouling by innovative method (injection of air jet)
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4236437/
https://www.ncbi.nlm.nih.gov/pubmed/25411641
http://dx.doi.org/10.1186/s40201-014-0128-0
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