Characterization and filtration performance of coating-modified polymeric membranes used in membrane bioreactors

Kochan, Jozef, Wintgens, Thomas, Melin, Thomas and Wong, John Erik Characterization and filtration performance of coating-modified polymeric membranes used in membrane bioreactors Chemical Papers, Vol.63, No. 2, 2009, 152-157

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  

Author(s) Kochan, Jozef
Wintgens, Thomas
Melin, Thomas
Wong, John Erik
Title Characterization and filtration performance of coating-modified polymeric membranes used in membrane bioreactors
Journal name Chemical Papers
Publication date 2009
Year available 2009
Volume number 63
Issue number 2
ISSN 0366-6352
Start page 152
End page 157
Place of publication Poland
Publisher Versita
Collection year 2009
Language english
Subject 290000 Engineering and Technology
291100 Environmental Engineering
Abstract/Summary One of the critical issues for membrane application in wastewater treatment is membrane fouling majorly caused by dissolved organic matters. The aim of the present study was to lower membrane fouling by adsorption of polyelectrolytes. In the paper, the feasibility of coating for diverse ultrafiltration membrane materials was investigated and their filtration performance was compared to that of the unmodified ones. Different ultrafiltration flat-sheet membranes, polyvinylidene fluoride, polyethersulfone, polysulfone and cellulose acetate were coated by branched poly(ethyleneimine) (PEI), poly(diallyldimethylammonium chloride) (PDADMAC) and poly(allylamine chloride) (PAH) and filtrated with sludge supernatant. Short term experiments showed a substantial drop of permeability: almost 40 % for PEI, 23 % for PDADMAC, and about 19 % for PAH coating. This deterioration resulted from the additional resistance of the deposited layers. On the other hand, coating led to lower fouling rates during filtration. In the stable state of filtration, coated membranes showed higher permeabilities compared to the uncoated ones. For the polyethersulfone membrane, the average permeability enhancement was 11 %. For polysulfone and cellulose acetate membranes, the permeability improved by 28 % and 15 % respectively. For polyvinylidene fluoride membranes only coating with PDADMAC enhanced the permeability, by 13 %. PEI and PAH modified membranes featured lower permeabilities than the uncoated ones.
 
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