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Title: Phenol degradation in a three-phase biofilm fluidized sand bed reactor
Authors : Etzensperger, M.
Thoma, S.
Petrozzi, Sergio
Dunn, Irving J.
Published in : Bioprocess and Biosystems Engineering
Volume(Issue) : 4
Issue : 4
Pages : 175
Pages to: 181
Publisher / Ed. Institution : Springer
Issue Date: 1989
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
Language : English
Subjects : Dissolve oxygen; Sole carbon source; Biomass concentration; Oxygen transfer; Aeration rate
Subject (DDC) : 572: Biochemistry
Abstract: A previous three phase fluidized sand bed reactor design was improved by adding a draft tube to improve fluidization and submerged effluent tubes for sand separation. The changes had little influence on the oxygen transfer coefficients(KL a), but greatly reduced the aeration rate required for sand suspension. The resulting 12.5 dm3 reactor was operated with 1 h liquid residence time, 10.2dm3/min aeration rate, and 1.7-2.3 kg sand (0.25-0.35 mm diameter) for the degradation of phenol as sole carbon source. The KLa of 0.015 s−1 gave more than adequate oxygen transfer to support rates of 180g phenol/h · m3 and 216 g oxygen/h · m3. The biomass-sand ratios of 20-35 mg volatiles/g gave estimated biomass concentrations of 3-6 g volatiles/dm3. Offline kinetic measurements showed weak inhibition kinetics with constants ofKs=0.2 mg phenol/dm3, Ko2=0.5 mg oxygen/dm3 and KinI= 122.5 mg phenol/dm3. Very small biofilm diffusion effects were observed. Dynamic experiments demonstrated rapid response of dissolved oxygen to phenol changes below the inhibition level. Experimentally simulated continuous stagewise operation required three stages, each with 1 h residence time, for complete degradation of 300 mg phenol/dm3 · h.
Further description : «Erworben im Rahmen der Schweizer Nationallizenzen (»
Departement: Life Sciences and Facility Management
Publication type: Article in scientific journal
DOI : 10.21256/zhaw-1699
ISSN: 1615-7591
Appears in Collections:Publikationen Life Sciences und Facility Management

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