Effects of pH and cyclodextrins on pentachlorophenol degradation (mineralization) by white-rot fungi

Journal of Environmental Management
David Boyle

Abstract

White-rot fungi (WRF) such as Trametes hirsuta completely degrade (mineralize) pentachlorophenol (PCP) and many other organopollutants. This has led to them being used to decontaminate various substrates (e.g. soil) through biorememediation. However, because PCP is a biocide, it can inhibit fungal growth and thereby its own degradation. It was hypothesized that substrate pH might affect PCP degradation, because when the pH is lower than 4.7 (the pKa for PCP) the phenol predominates, while at higher pH the phenate does. These two PCP species differ markedly in physical and biological properties. The effect of cyclodextrins was also investigated since it is known that the inclusion complexes these form with PCP differ in bioavailability and toxicity from non-complexed PCP. Tests were first made in liquid and agar media (where conditions are relatively easy to control), and then in a sawdust, because it is a common target matrix for WRF bioremediation. Results with the liquid and agar media showed that growth in the presence of inhibitory PCP concentrations decreased as the pH decreased, consistent with the phenol being more toxic. Growth in sawdust was less affected by PCP regardless of the pH, presumably because the PCP sorbed t...Continue Reading

References

Apr 16, 2004·Journal of Environmental Management·K HannaP Germain
Jun 26, 2004·Journal of Environmental Management·M WalterC Ford
Dec 1, 1994·Environmental Science & Technology·M G StapletonS K Dentel
Feb 1, 1994·Environmental Science & Technology·D P Barr, S D Aust
Dec 1, 1984·Microbial Ecology·J H Apajalahti, M S Salkinoja-Salonen

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Citations

Apr 23, 2017·Revista Argentina de microbiología·Reyna L Camacho-MoralesJosé E Sánchez
Jan 1, 2015·Beilstein Journal of Organic Chemistry·Véronique Nardello-Rataj, Loïc Leclercq
Feb 2, 2017·Beilstein Journal of Organic Chemistry·Loïc Leclercq
Oct 10, 2020·Environmental Science and Pollution Research International·Fatemeh Sadat ArghavanMorteza Ghadirian

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