The use of iron oxide (Fe3O4) particles to reduce fouling in membrane bioreactors (MBRs)
| Autor: | Semblante Galilee-Uy, 蘇莉華 |
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| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 Soluble microbial products (SMP) are biomolecules that have a significant impact on the fouling phenomenon of membrane bioreactors (MBR). In this study, micro-sized (~500 nm) magnetic particles were evaluated as a possible SMP adsorbent. Magnetite (Fe3O4) was prepared via co-precipitation method, and then coated with polymethyl methacrylate (PMMA) for surface functionalization. The effect of coating method (atom transfer radical polymerization, ATRP and ozone-induced free radical polymerization, O3-RP), temperature (40, 60, 80oC), and time (2, 4, 6 hr) on the adsorption of bovine serum albumin (BSA) was determined in batch tests. It was observed that magnetite coated with PMMA (Fe3O4-PMMA) had higher adsorption capacity than its pristine form. Particles coated at 80oC possessed the highest adsorption capacities (8 to 10 mg/g), regardless of coating method and time. This might be due to the fact that coating temperature has the most influence on the amount of coated polymer. Magnetite have high recoverability – it was found that 99.94% can be separated from water through magnet in as quickly as 10 min. Magnetic particles have potential to recovered, treated, and then re-used as adsorbent for multiple cycles, continuously separating SMP and reducing membrane fouling. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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