M. Mouncif et al., A BIOTECHNOLOGICAL VALORIZATION AND TREATMENT OF OLIVE MILL WASTE-WATERS BY SELECTED YEAST STRAINS, Grasas y aceites, 46(6), 1995, pp. 344-348
Olive mill waste waters were diluted to 1/10, supplied with 2% urea an
d inoculated with yeast strains. 20 yeast strains isolated from Olive
Mill Waste (OMW) water were screened for their biomass production, COD
reduction and polyphenols bioconversion activities. Pure cultures of
yeasts were realized in 100 ml erlen-meyer flasks. 50 ml cultures were
used and the flasks were incubated at room temperature (22 degrees C)
on a shaker. Biomass production, COD (chemical oxygen demand) reducti
on and Polyphenols bioconversion were followed up in the inoculated OM
W waters. Results showed that the urea supply improve significantly th
e biomass production relatively to the control. This reached in some a
ssays 2.06% expressed as g of biomass dry weight per 100 mL of OMW wat
er. Polyphenols removal was estimated to around 50% and the COD was de
creased from 54.14 g/Kg to 21.56 g/Kg. This aerobic treatment lead to
the biomass production and also to a pretreated efluent by the COD and
the removal of the methanization inhibiting polyphenolic compounds.