Detoxification of olive mill wastewaters by Moroccan yeast isolates

A. Ben Sassi, N. Ouazzani, Graeme M. Walker, S. Ibnsouda, M. El El Mzibri, Abdellatif Boussaid

Research output: Contribution to journalArticle

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Abstract

A total of 105 yeast strains were isolated from Moroccan olive oil production plants and evaluated for their ability to grow in olive oil mill wastewaters (OMW). The 9 isolates that grew best on OMW were selected for further study to evaluate their effect on removal of organic pollutants and OMW phytotoxicity (barley seed germination test). The results showed that at least four yeast isolates effectively lowered the toxicity of this effluent in addition to providing very useful materials in terms of both yeast biomass (6 g/l DW) and an irrigation fluid. This group of yeast isolates significantly reduced the concentration of total phenols (44% removal) and Chemical Oxygen Demand, COD (63% removal). The best germination rate of 80% for undiluted OMW was obtained for strain Candida holstii that also increased the pH from 4.76 to 6.75. Principal component analysis of the results obtained for the best yeast strains confirmed the importance of COD and total phenol reduction along with increase of organic nitrogen and final pH for the improvement of germination rates and phytotoxic reduction. This study has highlighted the potential of indigenous yeasts in detoxification of olive mill wastewaters.
Original languageEnglish
Pages (from-to)337-346
Number of pages10
JournalBiodegradation
Volume19
Issue number3
DOIs
StatePublished - Jun 2008

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yeast
HLA Antigens
Yeast
Waste Water
Yeasts
mill
wastewater
Sex Differentiation
Wastewater
Oils
oil
Germination
germination
Carbamoyl-Phosphate Synthase (Glutamine-Hydrolyzing)
Removal
detoxification
phenol
Thiamphenicol
Detoxification
Olive oil

Cite this

Sassi, A. B., Ouazzani, N., Walker, G. M., Ibnsouda, S., El Mzibri, M. E., & Boussaid, A. (2008). Detoxification of olive mill wastewaters by Moroccan yeast isolates. Biodegradation, 19(3), 337-346. DOI: 10.1007/s10532-007-9140-8

Sassi, A. Ben; Ouazzani, N.; Walker, Graeme M.; Ibnsouda, S.; El Mzibri, M. El; Boussaid, Abdellatif / Detoxification of olive mill wastewaters by Moroccan yeast isolates.

In: Biodegradation, Vol. 19, No. 3, 06.2008, p. 337-346.

Research output: Contribution to journalArticle

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abstract = "A total of 105 yeast strains were isolated from Moroccan olive oil production plants and evaluated for their ability to grow in olive oil mill wastewaters (OMW). The 9 isolates that grew best on OMW were selected for further study to evaluate their effect on removal of organic pollutants and OMW phytotoxicity (barley seed germination test). The results showed that at least four yeast isolates effectively lowered the toxicity of this effluent in addition to providing very useful materials in terms of both yeast biomass (6 g/l DW) and an irrigation fluid. This group of yeast isolates significantly reduced the concentration of total phenols (44% removal) and Chemical Oxygen Demand, COD (63% removal). The best germination rate of 80% for undiluted OMW was obtained for strain Candida holstii that also increased the pH from 4.76 to 6.75. Principal component analysis of the results obtained for the best yeast strains confirmed the importance of COD and total phenol reduction along with increase of organic nitrogen and final pH for the improvement of germination rates and phytotoxic reduction. This study has highlighted the potential of indigenous yeasts in detoxification of olive mill wastewaters.",
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Sassi, AB, Ouazzani, N, Walker, GM, Ibnsouda, S, El Mzibri, ME & Boussaid, A 2008, 'Detoxification of olive mill wastewaters by Moroccan yeast isolates' Biodegradation, vol 19, no. 3, pp. 337-346. DOI: 10.1007/s10532-007-9140-8

Detoxification of olive mill wastewaters by Moroccan yeast isolates. / Sassi, A. Ben; Ouazzani, N.; Walker, Graeme M.; Ibnsouda, S.; El Mzibri, M. El; Boussaid, Abdellatif.

In: Biodegradation, Vol. 19, No. 3, 06.2008, p. 337-346.

Research output: Contribution to journalArticle

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T1 - Detoxification of olive mill wastewaters by Moroccan yeast isolates

AU - Sassi,A. Ben

AU - Ouazzani,N.

AU - Walker,Graeme M.

AU - Ibnsouda,S.

AU - El Mzibri,M. El

AU - Boussaid,Abdellatif

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N2 - A total of 105 yeast strains were isolated from Moroccan olive oil production plants and evaluated for their ability to grow in olive oil mill wastewaters (OMW). The 9 isolates that grew best on OMW were selected for further study to evaluate their effect on removal of organic pollutants and OMW phytotoxicity (barley seed germination test). The results showed that at least four yeast isolates effectively lowered the toxicity of this effluent in addition to providing very useful materials in terms of both yeast biomass (6 g/l DW) and an irrigation fluid. This group of yeast isolates significantly reduced the concentration of total phenols (44% removal) and Chemical Oxygen Demand, COD (63% removal). The best germination rate of 80% for undiluted OMW was obtained for strain Candida holstii that also increased the pH from 4.76 to 6.75. Principal component analysis of the results obtained for the best yeast strains confirmed the importance of COD and total phenol reduction along with increase of organic nitrogen and final pH for the improvement of germination rates and phytotoxic reduction. This study has highlighted the potential of indigenous yeasts in detoxification of olive mill wastewaters.

AB - A total of 105 yeast strains were isolated from Moroccan olive oil production plants and evaluated for their ability to grow in olive oil mill wastewaters (OMW). The 9 isolates that grew best on OMW were selected for further study to evaluate their effect on removal of organic pollutants and OMW phytotoxicity (barley seed germination test). The results showed that at least four yeast isolates effectively lowered the toxicity of this effluent in addition to providing very useful materials in terms of both yeast biomass (6 g/l DW) and an irrigation fluid. This group of yeast isolates significantly reduced the concentration of total phenols (44% removal) and Chemical Oxygen Demand, COD (63% removal). The best germination rate of 80% for undiluted OMW was obtained for strain Candida holstii that also increased the pH from 4.76 to 6.75. Principal component analysis of the results obtained for the best yeast strains confirmed the importance of COD and total phenol reduction along with increase of organic nitrogen and final pH for the improvement of germination rates and phytotoxic reduction. This study has highlighted the potential of indigenous yeasts in detoxification of olive mill wastewaters.

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Sassi AB, Ouazzani N, Walker GM, Ibnsouda S, El Mzibri ME, Boussaid A. Detoxification of olive mill wastewaters by Moroccan yeast isolates. Biodegradation. 2008 Jun;19(3):337-346. Available from, DOI: 10.1007/s10532-007-9140-8