1Biotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14155-4838, Tehran, I.R. IRAN
2Science and Technology Research Center, Tehran, I.R. IRAN
In this study fungi isolated from the effluent of ethanol factories were identified. Optimal conditions for single cell protein (SCP) production and COD reduction of sugar beet stillage are specified for a species of Hansenula in a continuous culture. Under these conditions 5.7 g dm-3 biomass was produced and 31% of COD was reduced without addition of further nutrients to the beet molasses stillage. Adding nitrogen and phosphorus sources، increased the biomass production and COD reduction to 8.5 g dm-3 and 35.7%، respectively. The crude protein content of SCP in the absence and presence of additives was 39.6% and to 50.6% respectively. The amounts of essential amino acids measured were greater than that of the FAO standards reference and are comparable with some other food proteins، such as soya bean and fish meal.