Nonionic surfactant effects on pentachlorophenol biodegradation

Water Research
Todd CortAngela R Bielefeldt

Abstract

Several potential mechanisms of surfactant-induced inhibition of pentachlorophenol (PCP) biodegradation were tested using a pure bacterial culture of Sphingomonas chlorophenolicum sp. Strain RA2. PCP degradation, glucose degradation, and oxygen uptake during endogenous conditions and during glucose degradation were measured for batch systems in the presence of the nonionic surfactant Tergitol NP-10 (TNP10). TNP10 did not exert toxicity on RA2 as measured by dissolved oxygen uptake rates under endogenous conditions and glucose biodegradation rates. TNPIO reduced the substrate inhibition effect of PCP at high PCP concentrations, resulting in faster PCP degradation rates at higher concentrations of TNP10. Calculations of a micelle partition coefficient (Kmic) show that PCP degradation rates in the presence of surfactant can be explained by accounting for the amount of PCP available to the cell in the aqueous solution. A model is discussed based on these results where PCP is sequestered into micelles at high TNP10 concentrations to become less available to the bacterial cell and resulting in observed inhibition. Under substrate toxicity conditions, the same mechanism serves to increase the rate of PCP biodegradation by reducing aqu...Continue Reading

References

Jun 1, 1995·Environmental Science & Technology·S J GrimbergM D Aitken

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Citations

Mar 6, 2009·Applied Biochemistry and Biotechnology·Jin-Huan SuZhi-Long Wang
Aug 28, 2013·Journal of Hazardous Materials·Guangji HuGuangming Zeng
Nov 28, 2002·Journal of Applied Microbiology·N Christofi, I B Ivshina
Apr 28, 2012·Journal of Hazardous Materials·Myoungsuk Song, Angela R Bielefeldt
Jun 6, 2009·European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences·Marika KamberiDebra Feder
Feb 12, 2008·Chemosphere·Sujata Ray, Catherine A Peters
Oct 25, 2016·Journal of Hazardous Materials·Yang LiuShaoheng Liu
Feb 3, 2005·Biotechnology and Bioengineering·Angela R Bielefeldt, Todd Cort
May 17, 2021·European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Für Pharmazeutische Verfahrenstechnik E.V·Meenakshi GoelMohammad Al-Sayah

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