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

Paper ID Volume ID Publish Year Pages File Format Full-Text
35649 45100 2009 11 PDF Available
Title
Impact of oxygen mass transfer on nitrification reactions in suspended carrier reactor biofilms
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.

Keywords
Mass transfer; Suspended carrier reactor; Biofilm; Nitrification; Biofilm model; Oxygen transfer
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Impact of oxygen mass transfer on nitrification reactions in suspended carrier reactor biofilms
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 44, Issue 1, January 2009, Pages 43–53
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
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