The use of silica gel prepared by sol-gel method and polyurethane foam as microbial carriers in the continuous degradation of phenol
Language English Country Germany Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
10968628
DOI
10.1007/s002530000366
Knihovny.cz E-resources
- MeSH
- Biodegradation, Environmental MeSH
- Biomass MeSH
- Bioreactors * MeSH
- Phenols metabolism MeSH
- Cells, Immobilized * MeSH
- Culture Media MeSH
- Yeasts metabolism MeSH
- Moraxella metabolism MeSH
- Ochrobactrum anthropi metabolism MeSH
- Silicon Dioxide MeSH
- Polyurethanes MeSH
- Proteobacteria metabolism MeSH
- Silica Gel MeSH
- Stenotrophomonas maltophilia metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Phenols MeSH
- Culture Media MeSH
- Silicon Dioxide MeSH
- polyurethane foam MeSH Browser
- Polyurethanes MeSH
- Silica Gel MeSH
A mixed microbial culture was immobilized by entrapment into silica gel (SG) and entrapment/ adsorption on polyurethane foam (PU) and ceramic foam. The phenol degradation performance of the SG biocatalyst was studied in a packed-bed reactor (PBR), packed-bed reactor with ceramic foam (PBRC) and fluidized-bed reactor (FBR). In continuous experiments the maximum degradation rate of phenol (q(s)max) decreased in the order: PBRC (598 mg l(-1) h(-1)) > PBR (PU, 471 mg l(-1)h(-1)) > PBR(SG, 394 mg l(-1) h(-1)) > FBR (PU, 161 mg l(-1) h(-1)) > FBR (SG, 91 mg l(-1) h(-1)). The long-term use of the SG biocatalyst in continuous phenol degradation resulted in the formation of a 100-200 microm thick layer with a high cell density on the surface of the gel particles. The abrasion of the surface layer in the FBR contributed to the poor degradation performance of this reactor configuration. Coating the ceramic foam with a layer of cells immobilized in colloidal SiO2 enhanced the phenol degradation efficiency during the first 3 days of the PBRC operation, in comparison with untreated ceramic packing.
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