Original scientific paper
https://doi.org/10.2478/10004-1254-61-2010-2079
Biodegradation of Olive Mill Wastewater by Trichosporon cutaneum and Geotrichum candidum
Tibela Landeka Dragičević
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Marijana Zanoški Hren
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Margareta Gmajnić
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Sanja Pelko
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Dzoko Kungulovski
; Faculty of Natural Sciences, Gazi Baba bb, Sts. Cyril and Methodius University, Skopje, Macedonia
Ivan Kungulovski
; Faculty of Natural Sciences, Gazi Baba bb, Sts. Cyril and Methodius University, Skopje, Macedonia
Domagoj Čvek
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Jadranka Frece
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Ksenija Markov
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Frane Delaš
; Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
Abstract
Olive oil production generates large volumes of wastewater. These wastewaters are characterised by high chemical oxygen demand (COD), high content of microbial growth-inhibiting compounds such as
phenolic compounds and tannins, and dark colour. The aim of this study was to investigate biodegradation of olive mill wastewater (OMW) by yeasts Trichosporon cutaneum and Geotrichum candidum. The yeast Trichosporon cutaneum was used because it has a high potential to biodegrade phenolic compounds and a wide range of toxic compounds. The yeast Geotrichum candidum was used to see how successful it is in biodegrading compounds that give the dark colour to the wastewater. Under aerobic conditions, Trichosporon cutaneum removed 88 % of COD and 64 % of phenolic compounds, while the dark colour remained. Geotrichum candidum grown in static conditions reduced COD and colour further by 77 % and 47 %, respectively. This investigation has shown that Trichosporon cutaneum under aerobic conditions and Geotrichum candidum under facultative anaerobic conditions could be used successfully in a two-step biodegradation process. Further investigation of OMW treatment by selected yeasts should contribute to better understanding of biodegradation and decolourisation and should include ecotoxicological evaluation of the treated OMW.
Keywords
decolourisation; detoxifi cation; phenolic compounds; yeasts
Hrčak ID:
62461
URI
Publication date:
21.12.2010.
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