NDLI: Strategies for dephenolization of raw olive mill wastewater by means of Pleurotus ostreatus

Content Provider	Springer Nature Link
Author	Olivieri, Giuseppe Russo, Maria Elena Giardina, Paola Marzocchella, Antonio Sannia, Giovanni Salati, Piero
Copyright Year	2011
Abstract	The reduction of polyphenols content in olive mill wastewater (OMW) is a major issue in olive oil manufacturing. Although researchers have pointed out the potential of white-rot fungus in dephenolizing OMW, the results available in the literature mainly concern pretreated (sterilized) OMW. This paper deals with the reduction of polyphenols content in untreated OMW by means of a white-rot fungus, Pleurotus ostreatus. Dephenolization was performed both in an airlift bioreactor and in aerated flasks. The process was carried out under controlled non-sterile conditions, with different operating configurations (batch, continuous, biomass recycling) representative of potential industrial operations. Total organic carbon, polyphenols concentration, phenol oxidase activity, dissolved oxygen concentration, oxygen consumption rate, and pH were measured during every run. Tests were carried out with or without added nutrients (potato starch and potato dextrose) and laccases inducers (i.e., CuSO4). OMW endogenous microorganisms were competing with P. ostreatus for oxygen during simultaneous fermentation. Dephenolization of raw OMW by P. ostreatus under single batch was as large as 70%. Dephenolization was still extensive even when biomass was recycled up to six times. OMW pre-aeration had to be provided under continuous operation to avoid oxygen consumption by endogenous microorganisms that might spoil the process. The role of laccases in the dephenolization process has been discussed. Dephenolization under batch conditions with biomass recycling and added nutrients proved to be the most effective configuration for OMW polyphenols reduction in industrial plants (42–68% for five cycles).
Starting Page	719
Ending Page	729
Page Count	11
File Format	PDF
ISSN	13675435
Journal	Journal of Industrial Microbiology and Biotechnology
Volume Number	39
Issue Number	5
e-ISSN	14765535
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-12-18
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Olive mill wastewater Airlift Polyphenols Laccases Continuous cultures Pleurotus ostreatus Microbiology Bioinformatics Genetic Engineering Biotechnology Biochemistry Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Bioengineering Applied Microbiology and Biotechnology Biotechnology

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