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%.
| Original language | English |
|---|---|
| Title of host publication | Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel-like layer |
| Number of pages | 10 |
| Publication date | 2013 |
| Publication status | Published - 2013 |
| Event | IWA specialized membrane technology coference - Toronto, Canada Duration: 25 Aug 2013 → 29 Aug 2013 |
Conference
| Conference | IWA specialized membrane technology coference |
|---|---|
| Country/Territory | Canada |
| City | Toronto |
| Period | 25/08/2013 → 29/08/2013 |
Keywords
- free EPS, humic-like substances, adsorption, gel formation, fouling resistance,