| Enhancement of filterability in MBR achieved by improvement of supernatant and floc characteristics via filter aids addition. | |
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MedLine Citation:
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PMID: 18694586 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Reduction of membrane fouling in membrane bioreactors (MBR) by addition of three typical filter aids (aluminum sulfate (Al(2)(SO(4))(3)), polymeric ferric sulfate (PFS) and Chitosan) was investigated. The effects of filter aids on membrane pore blocking, gel layer and cake layer resistance were analyzed respectively. Significant improvement of the sustainable filtration was demonstrated in the filter aids added MBRs. The membrane fouling rate of the MBRs operated under 20L/m(2)h flux was in the order of Control MBR (no filter aid added)>Al(2)(SO(4))(3) added MBR>Chitosan added MBR>PFS added MBR. Membrane inner fouling due to pore blocking was analyzed by means of Fourier-transform infrared microscope (FTIR). Compared to the control MBR, significantly low protein and carbohydrate concentrations were measured in the membranes of the filter aids added MBRs, indicating that filter aids could effectively alleviate membrane pore blocking. Gel Permeation Chromatography (GPC) analysis suggested that both the concentration and molecular weight distribution of the macromolecules in supernatant play an important role in gel layer formation and loss of membrane porosity. The reduction of fouling rate in the filter aids added MBRs could be attributed to lower concentration and reduction in molecular weight of macromolecules in supernatant. The specific cake resistance (alpha(c)), mean floc size (d(p)) and fractal dimension of the flocs (df) in the filter aids added MBRs were also investigated. It was demonstrated that alpha(c) decreased with the increase of d(p) and with the decrease of df, which is in consistent with the model prediction. |
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Authors:
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Jing Ji; Jiangping Qiu; Fook-sin Wong; Yaozhong Li |
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Publication Detail:
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Type: Journal Article Date: 2008-06-24 |
Journal Detail:
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Title: Water research Volume: 42 ISSN: 0043-1354 ISO Abbreviation: Water Res. Publication Date: 2008 Aug |
Date Detail:
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Created Date: 2008-09-08 Completed Date: 2009-01-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0105072 Medline TA: Water Res Country: England |
Other Details:
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Languages: eng Pagination: 3611-22 Citation Subset: IM |
Affiliation:
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School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 200240, China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Alum Compounds
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chemistry Bioreactors* Chitosan / chemistry Ferric Compounds / chemistry Filtration / instrumentation*, methods* Flocculation Membranes, Artificial* Time Factors Water Pollutants, Chemical / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Alum Compounds; 0/Ferric Compounds; 0/Membranes, Artificial; 0/Water Pollutants, Chemical; 10028-22-5/ferric sulfate; 10043-01-3/aluminum sulfate; 9012-76-4/Chitosan |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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