Journal
CHEMICAL ENGINEERING JOURNAL
Volume 277, Issue -, Pages 209-218Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.04.141
Keywords
Moving bed membrane bioreactor; Nitrosomonas; Nitrospira; Denitrifying bacteria; Multivariate statistical analysis
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Funding
- Spanish Ministerio de Ciencia y Tecnologia (MCyT) [CTM2009-11929-CO2-02]
- University of Granada
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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. (C) 2015 Elsevier B.V. All rights reserved.
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