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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 11, No. 4, 2008
Bioline Code: ej08054
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 11, No. 4, 2008

 en Relationship between cultivation mode of white rot fungi and their efficiency for olive oil mill wastewaters treatment
Mdaghri Alaoui, S.; Merzouki, M.; Penninckx, M.J. & Benlemlih, M.

Abstract

Four white rot fungi (WRF) strains, Phanerochaete chrysosporium check for this species in other resources , Trametes versicolor check for this species in other resources , Coriolopsis polyzona check for this species in other resources and Pycnoporus coccineus check for this species in other resources , were tested for efficiency of treatment of Olive Oil mill wastewaters (OOMW) in relation with their cultivation mode, i.e. under the form of free mycelium, mycelium immobilized in alginate beads and solid state cultivation on Petri dishes. Study of biodegradation of phenolic compounds, chemical oxygen demand (COD) decrease and decolourisation of OOMW have shown that Coriolopsis polyzona and Pycnoporus coccineus degradation performances were apparently only slightly affected by the cell cultivation procedures experienced here. In contrast, Phanerochaete chrysosporium and Trametes versicolor showed respectively marked preferences for solid state and alginate immobilisation procedures. Both mono and polyphenolics were reduced to different extent during incubation depending on the strain, as shown by gel filtration analysis. Final pH obtained after fungal treatment of the OOMW based medium (initial pH of 5.0) was measured in order to evaluate the possibility of releasing friendly the treated wastewater in the environment. Laboratory studies as reported here may be useful for orienting the choice of a strain for treating pollution by OOMW in a particular real situation.

Keywords
biotreatment, cell immobilization, olive oil mill wastewaters, white rot fungi.

 
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