Application of air flow for mitigation of particle deposition in submerged membrane microfiltration

Pradhan, Muna, Aryal, Rupak, Kandasamy, Jaya and Vigneswaran, Saravanamuthu (2011) Application of air flow for mitigation of particle deposition in submerged membrane microfiltration. Desalination and Water Treatment, 32 1-3: 201-207. doi:10.5004/dwt.2011.2699

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Author Pradhan, Muna
Aryal, Rupak
Kandasamy, Jaya
Vigneswaran, Saravanamuthu
Title Application of air flow for mitigation of particle deposition in submerged membrane microfiltration
Journal name Desalination and Water Treatment   Check publisher's open access policy
ISSN 1944-3994
1944-3986
Publication date 2011-08
Sub-type Article (original research)
DOI 10.5004/dwt.2011.2699
Volume 32
Issue 1-3
Start page 201
End page 207
Total pages 7
Place of publication Hopkinton, MA, United States
Publisher Balaban Publishers
Collection year 2012
Language eng
Abstract This study investigates the effect of microfiltration operating conditions on membrane fouling of colloidal particles of kaolin clay. Experiments were conducted with a flat sheet membrane submerged in a suspension prepared from kaolin clay powder of size varying from 0.1 to 4 mm (Sigma) with a mean particle size 2.10 mm. The particle size distribution of clay was unimodal and the concentration of kaolin clay was similar to the biomass concentration in a membrane bioreactor (10 g/L). The effects of scouring and permeate flux rates were studied in terms of the membrane fouling rate. A linear relationship between the transmembrane pressure (TMP) and particle deposition was established for different air flow rates and permeate flow rates. Air scouring was more effective at a low permeate flux. There was only a minor change in the mean particle size of deposited colloidal particles on the membrane at a given flux under varying air flows and at the beginning all had a similar rise in TMP. However, at the later stages as particles accumulated on the membrane surface there was a significant rise in TMP. 15 LMH flux was observed as critical flux beyond which a rise in the permeate flux showed a sharp rise in the TMP which varied with air flow rates and particle deposition. The sharp TMP rise that occurred during the initial few hours of operation indicated that air flow for fouling mitigation strategies should target this period to optimise the membrane process. The study showed that air flow and flux rates are the two major governing factors for particle deposition on the membrane surface.
Keyword Air flow
Membrane fouling
Membrane technology
Permeate flux
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
Advanced Water Management Centre Publications
 
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Created: Fri, 10 Feb 2012, 11:16:07 EST by Dr Rupak Aryal on behalf of Advanced Water Management Centre