Impact of oxygen mass transfer on nitrification reactions in suspended carrier reactor biofilms

Gapes, D.J. and Keller, J. (2009) Impact of oxygen mass transfer on nitrification reactions in suspended carrier reactor biofilms. Process Biochemistry, 44 1: 43-53. doi:10.1016/j.procbio.2008.09.004


Author Gapes, D.J.
Keller, J.
Title Impact of oxygen mass transfer on nitrification reactions in suspended carrier reactor biofilms
Journal name Process Biochemistry   Check publisher's open access policy
ISSN 1359-5113
Publication date 2009-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.procbio.2008.09.004
Volume 44
Issue 1
Start page 43
End page 53
Total pages 11
Place of publication United Kingdom
Publisher Elsevier Science
Collection year 2009
Language eng
Subject C1
090409 Wastewater Treatment Processes
960912 Urban and Industrial Water Management
Abstract Biofilm-internal and external mass transfer resistance was investigated in laboratory-scale nitrifying suspended carrier reactors (SCR), demonstrating the importance of these factors for these increasingly popular reactor systems. Controlled respirometric experiments revealed that oxygen mass transfer resistance regulated the process performance up to a DO concentration of 20 mg L−1. External mass transfer exerts significant control over the overall reaction rate, thus biofilm models must adequately account for this resistance. Whilst carrier type and characteristics have some influence, biofilm structure seems primarily responsible for differences in mass transfer and nitrification performance. Heterogeneous biofilms grown under high ammonium loadings had much greater area-specific rates than the gel-like biofilms sourced from low loaded systems. Being a mass-transfer controlled process, the overall reaction rate of these SCR systems could be immediately increased by elevating the DO above normal operating levels (up to 20 mg L−1). Long-term oxygen deficiency in the lower biofilm sections does not negatively affect the biomass activity.
Keyword Mass transfer; Suspended carrier reactor; Biofilm; Nitrification; Biofilm model; Oxygen transfer
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Available online 20 September 2008.

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Tue, 23 Jun 2009, 15:00:38 EST by Sarah Borsellino on behalf of Advanced Water Management Centre