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Title
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Nitrogen removal in a moving bed membrane bioreactor for municipal sewage treatment : community differentiation in attached biofilm and suspended biomass
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Author
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Abstract
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| Moving bed membrane bioreactors (MBMBR) are advanced biological wastewater treatments combining suspended biomass (SB) and attached biofilms (AB). To evaluate the specific contribution of each biomass fraction to N removal, the abundances of gene markers of nitrifying and denitrifying bacteria were measured by quantitative PCR in a pilot-scale MBMBR treating municipal sewage. Eight experimental phases were conducted, combining different carrier filling ratios (20% or 35%, v/v), hydraulic retention times (10 h or 24 h) and mixed liquor total suspended solids (ca. 2500 mg/L or ca. 4500 mg/L). Under all the operating conditions tested, the abundance of the targeted bacterial groups was fairly similar in both SB and AB fractions, and the biofilm contributed >20% of the nitrifiers in the MBMBR. Mixed liquor volatile suspended solids, biofilm total solids, COD, temperature and carrier filling ratio significantly explained the changes of abundance of N-cycle bacteria, according to multivariate statistical analysis. In conclusion, the SB and AB fractions appeared to have equally relevant roles in the N removal process in a MBMBR. |
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Language
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English
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Source (journal)
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Chemical engineering journal. - Lausanne, 1996, currens
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Publication
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Lausanne
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Elsevier Sequoia
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2015
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ISSN
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1385-8947
[print]
1873-3212
[online]
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DOI
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10.1016/J.CEJ.2015.04.141
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Volume/pages
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277
(2015)
, p. 209-218
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ISI
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000356984400026
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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