Modelling of particle deposition in a submerged membrane microfiltration system
Identifieur interne : 004055 ( Main/Exploration ); précédent : 004054; suivant : 004056Modelling of particle deposition in a submerged membrane microfiltration system
Auteurs : M. Pradhan [Australie] ; S. Vigneswaran [Australie] ; R. Ben Aim [France] ; J. Kandasamy [Australie]Source :
- Desalination : (Amsterdam) [ 0011-9164 ] ; 2014.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
In this study, microfiltration of a concentrated suspension of kaolin clay was performed in an aerated tank with submerged flat sheet membranes. Particle deposition was correlated with cake resistance based on experimental results. The effects of air flow rate and permeate flux on transmembrane pressure (TMP) and on membrane resistance were studied. The experimental results show that the filtration resistance due to cake formation plays a dominant role in the total filtration resistance. An increase in permeate flux caused higher TMP development due to an increased amount of particle deposition. Conversely, an increase in air flow rate reduced TMP by detaching deposited layers back into suspension. The particle deposition under different filtration flux and air flow rates was correlated to establish an empirical formula. Based on the experimental results, a general relationship between the cake resistance, permeate flux and particle deposition was derived as Rc = 1.01 × 1012J-wc that suggests that the cake resistance is proportional to the multiplication of flux and cake deposition. Moreover, the effect of air flow on cake porosity was observed to be more significant at low permeate flux.
Affiliations:
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Le document en format XML
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<term>Modeling</term>
<term>Porosity</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Modélisation</term>
<term>Microfiltration</term>
<term>Séparation par membrane</term>
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<front><div type="abstract" xml:lang="en">In this study, microfiltration of a concentrated suspension of kaolin clay was performed in an aerated tank with submerged flat sheet membranes. Particle deposition was correlated with cake resistance based on experimental results. The effects of air flow rate and permeate flux on transmembrane pressure (TMP) and on membrane resistance were studied. The experimental results show that the filtration resistance due to cake formation plays a dominant role in the total filtration resistance. An increase in permeate flux caused higher TMP development due to an increased amount of particle deposition. Conversely, an increase in air flow rate reduced TMP by detaching deposited layers back into suspension. The particle deposition under different filtration flux and air flow rates was correlated to establish an empirical formula. Based on the experimental results, a general relationship between the cake resistance, permeate flux and particle deposition was derived as R<sub>c</sub>
= 1.01 × 10<sup>12</sup>
J-w<sub>c</sub>
that suggests that the cake resistance is proportional to the multiplication of flux and cake deposition. Moreover, the effect of air flow on cake porosity was observed to be more significant at low permeate flux.</div>
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