Biodegradation rates of aromatic contaminants in biofilm reactors

This study has shown that microorganisms can adapt to degrade mixtures of aromatic pollutants at relatively high rates in the µg/l concentration range. The biodegradation rates of the following compounds were investigated in biofilm systems: aromatic hydrocarbons, phenol, methylphenols, chlorophenol...

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Veröffentlicht in:Water science and technology 1995, Vol.31 (1), p.117-128
Hauptverfasser: Arcangeli, Jean-Pierre, Arvin, Erik
Format: Artikel
Sprache:eng
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Zusammenfassung:This study has shown that microorganisms can adapt to degrade mixtures of aromatic pollutants at relatively high rates in the µg/l concentration range. The biodegradation rates of the following compounds were investigated in biofilm systems: aromatic hydrocarbons, phenol, methylphenols, chlorophenols, nitrophenol, chlorobenzenes and aromatic nitrogen-, sulphur- or oxygen-containing heterocyclic compounds (NSOcompounds). Furthermore, a comparison with degradation rates observed for easily degradable organics is also presented. At concentrations below 20-100 µg/l the degradation of the aromatic compounds was typically controlled by fast order kinetics. The first-order surface removal rate constants were surprisingly similar, ranging from 2 to 4 m/d. It appears that NSO-compounds inhibit the degradation of aromatic hydrocarbons, even at very low concentrations of NSO-compounds. Under nitrate-reducing conditions, toluene was easily biodegraded. The xylenes and ethylbenzene were degraded cometabolically if toluene was used as a primary carbon source; their removal was influenced by competitive inhibition with toluene. These interaction phenomena are discussed in this paper and a kinetic model taking into account cometabolism and competitive inhibition is proposed.
ISSN:0273-1223
1996-9732
DOI:10.1016/0273-1223(95)00160-O