1999
DOI: 10.1897/1551-5028(1999)018<1927:eoanso>2.3.co;2
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Effects of a Nonionic Surfactant on Biodegradation of Phenanthrene and Hexadecane in Soil

Abstract: The influence of a nonionic (alcohol ethoxylate) surfactant (Witconol SN70) on biodegradation of phenanthrene and hexadecane (nonaqueous-phase liquid) in soil was studied in batch and transport systems. Simultaneous enhancement of phenanthrene and hexadecane degradation was noted at surfactant doses resulting in aqueous-phase surfactant concentrations below the critical micelle concentration (CMC). Conversely, degradation rates of both compounds declined to essentially zero at supra-CMC doses, suggesting that … Show more

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Cited by 3 publications
(2 citation statements)
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“…The inhibiting activity of surfactants toward microbial transformation processes is usually accounted for via one or a combination of three mechanisms: decreased bioavailability of the contaminant because of micellar solubilization [48], uptake of the surfactant as a preferential substrate over the contaminant [25,49], or interaction of the surfactant with vital components of the microorganism [27,50,51]. Experiments investigating the effect of Steol CS-330 concentration demonstrated that both PCE and TCE in a micellar solution are rapidly degraded, indicating that decreased bioavailability did not limit dechlorination.…”
Section: Effect Of Surfactants Similar In Structure To Steol Cs-330 Omentioning
confidence: 99%
“…The inhibiting activity of surfactants toward microbial transformation processes is usually accounted for via one or a combination of three mechanisms: decreased bioavailability of the contaminant because of micellar solubilization [48], uptake of the surfactant as a preferential substrate over the contaminant [25,49], or interaction of the surfactant with vital components of the microorganism [27,50,51]. Experiments investigating the effect of Steol CS-330 concentration demonstrated that both PCE and TCE in a micellar solution are rapidly degraded, indicating that decreased bioavailability did not limit dechlorination.…”
Section: Effect Of Surfactants Similar In Structure To Steol Cs-330 Omentioning
confidence: 99%
“…The extent of stimulation varies with the type and concentration of surfactants and the type of microorganisms involved [8][9][10][11][12][13]. Conversely, others have reported surfactant additions to inhibit, or at least not enhance, PAH biodegradation [14][15][16][17][18]. Various attempts to explain observations of undesirable effects have been made [19]; for example, adverse effects resulting from surfactants at high concentrations [16], formation of surfactant-membrane protein complexes produced by unfavorable micelle-cell interactions [20], permeabilization of cell membrane by surfactants [17], depletion of oxygen by surfactant-degrading bacteria [21], prevention of bacterial access or adhesion to hydrophobic substrates [1], and preferential utilization of surfactants as substrates by potential PAH degraders [14,15].…”
Section: Introductionmentioning
confidence: 99%