Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer

Eskandar Poorasgari, Poul Larsen, Xing Zheng, Per Halkjær Nielsen, Kristian Keiding, Morten Lykkegaard Christensen

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskning

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Resumé

Extra-cellular polymeric substances (EPS), known to contribute to fouling in membrane bio-reactors (MBR)s, are generally divided into bound and free EPS. The free EPS are able to form a gel-like layer on the membrane active surface. The mechanisms involved in formation of such layer and its effects on performance of the MBR membranes were studied. The free EPS, extracted by centrifugation and microfiltration, contained a significant amount of humic-like substances. Under static contact to the membrane, adsorption of humic-like substances to the membrane occurred and could be explained by conventional adsorption kinetics. Due to static adsorption, surface roughness of the membrane declined significantly indicating that adsorbed matters to the membrane filled the cavities of the membrane surface. Filtration of the free EPS caused 50% water flux decline. The fouling resistance linearly increased with the amount of the humic-like substances retained during filtration as predicted by gel growth theory. A low pressure backwash could re-establish the water flux only up to 70%.
OriginalsprogEngelsk
TitelIrreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer
Antal sider10
Publikationsdato2013
StatusUdgivet - 2013
BegivenhedIWA specialized membrane technology coference - Toronto, Canada
Varighed: 25 aug. 201329 aug. 2013

Konference

KonferenceIWA specialized membrane technology coference
LandCanada
ByToronto
Periode25/08/201329/08/2013

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fouling
bioreactor
gel
membrane
adsorption
growth theory
surface roughness
low pressure
cavity
kinetics
water

Citer dette

Poorasgari, E., Larsen, P., Zheng, X., Nielsen, P. H., Keiding, K., & Christensen, M. L. (2013). Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. I Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer
Poorasgari, Eskandar ; Larsen, Poul ; Zheng, Xing ; Nielsen, Per Halkjær ; Keiding, Kristian ; Christensen, Morten Lykkegaard. / Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. 2013.
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title = "Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer",
abstract = "Extra-cellular polymeric substances (EPS), known to contribute to fouling in membrane bio-reactors (MBR)s, are generally divided into bound and free EPS. The free EPS are able to form a gel-like layer on the membrane active surface. The mechanisms involved in formation of such layer and its effects on performance of the MBR membranes were studied. The free EPS, extracted by centrifugation and microfiltration, contained a significant amount of humic-like substances. Under static contact to the membrane, adsorption of humic-like substances to the membrane occurred and could be explained by conventional adsorption kinetics. Due to static adsorption, surface roughness of the membrane declined significantly indicating that adsorbed matters to the membrane filled the cavities of the membrane surface. Filtration of the free EPS caused 50{\%} water flux decline. The fouling resistance linearly increased with the amount of the humic-like substances retained during filtration as predicted by gel growth theory. A low pressure backwash could re-establish the water flux only up to 70{\%}.",
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Poorasgari, E, Larsen, P, Zheng, X, Nielsen, PH, Keiding, K & Christensen, ML 2013, Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. i Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer., Toronto, Canada, 25/08/2013.

Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. / Poorasgari, Eskandar; Larsen, Poul; Zheng, Xing ; Nielsen, Per Halkjær; Keiding, Kristian; Christensen, Morten Lykkegaard.

Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. 2013.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskning

TY - GEN

T1 - Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer

AU - Poorasgari, Eskandar

AU - Larsen, Poul

AU - Zheng, Xing

AU - Nielsen, Per Halkjær

AU - Keiding, Kristian

AU - Christensen, Morten Lykkegaard

PY - 2013

Y1 - 2013

N2 - Extra-cellular polymeric substances (EPS), known to contribute to fouling in membrane bio-reactors (MBR)s, are generally divided into bound and free EPS. The free EPS are able to form a gel-like layer on the membrane active surface. The mechanisms involved in formation of such layer and its effects on performance of the MBR membranes were studied. The free EPS, extracted by centrifugation and microfiltration, contained a significant amount of humic-like substances. Under static contact to the membrane, adsorption of humic-like substances to the membrane occurred and could be explained by conventional adsorption kinetics. Due to static adsorption, surface roughness of the membrane declined significantly indicating that adsorbed matters to the membrane filled the cavities of the membrane surface. Filtration of the free EPS caused 50% water flux decline. The fouling resistance linearly increased with the amount of the humic-like substances retained during filtration as predicted by gel growth theory. A low pressure backwash could re-establish the water flux only up to 70%.

AB - Extra-cellular polymeric substances (EPS), known to contribute to fouling in membrane bio-reactors (MBR)s, are generally divided into bound and free EPS. The free EPS are able to form a gel-like layer on the membrane active surface. The mechanisms involved in formation of such layer and its effects on performance of the MBR membranes were studied. The free EPS, extracted by centrifugation and microfiltration, contained a significant amount of humic-like substances. Under static contact to the membrane, adsorption of humic-like substances to the membrane occurred and could be explained by conventional adsorption kinetics. Due to static adsorption, surface roughness of the membrane declined significantly indicating that adsorbed matters to the membrane filled the cavities of the membrane surface. Filtration of the free EPS caused 50% water flux decline. The fouling resistance linearly increased with the amount of the humic-like substances retained during filtration as predicted by gel growth theory. A low pressure backwash could re-establish the water flux only up to 70%.

KW - free EPS, humic-like substances, adsorption, gel formation, fouling resistance,

M3 - Article in proceeding

BT - Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer

ER -

Poorasgari E, Larsen P, Zheng X, Nielsen PH, Keiding K, Christensen ML. Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. I Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer. 2013