Enhanced reduction of phenol content and toxicity in olive mill wastewaters by a newly isolated strain of Coriolopsis gallica.

Dalel Daasi, Lassaad Belbahri, Armelle Vallat, Steve Woodward, Moncef Nasri, Tahar Mechichi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The search for novel microorganisms able to degrade
olive mill wastewaters (OMW) and withstand the toxic
effects of the initially high phenolic concentrations is of
great scientific and industrial interest. In this work, the
possibility of reducing the phenolic content of OMW
using new isolates of fungal strains (Coriolopsis gallica,
Bjerkandera adusta, Trametes versicolor, Trichoderma
citrinoviride, Phanerochaete chrysosporium, Gloeophyllum
trabeum, Trametes trogii, and Fusarium solani) was investigated.
In vitro, all fungal isolates tested caused an outstanding
decolorization of OMW. However, C. gallica gave the highest
decolorization and dephenolization rates at 30 % v/v OMW
dilution in water. Fungal growth in OMW medium was affected
by several parameters including phenolic compound concentration,
nitrogen source, and inoculum size. The optimal
OMW medium for the removal of phenolics and color was
with the OMW concentration (in percent)/[(NH4)2SO4]/inoculum
ratio of 30:6:3. Under these conditions, 90 and 85 % of
the initial phenolic compounds and color were removed,
respectively. High-pressure liquid chromatography analysis
of extracts from treated and untreated OMW showed a clear
and substantial reduction in phenolic compound concentrations.
Phytotoxicity, assessed using radish (Raphanus sativus)
seeds, indicated an increase in germination index of 23–92 %
when a 30 % OMW concentration was treated with C. gallica
in different dilutions (1/2, 1/4, and 1/8).
Original languageEnglish
Pages (from-to)1746-1758
Number of pages13
JournalEnvironmental Science and Pollution Research
Volume21
Issue number3
Early online date25 Aug 2013
DOIs
Publication statusPublished - Feb 2014

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Keywords

  • Laccase
  • Coriolopsis gallica
  • Oil mill wastewater
  • Phenolic compounds

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