Treatment of biologically treated effluents from baker's yeast industry by membrane and ozone technologies

This paper presents pilot-scale membrane treatment results performed on biologically treated effluents from fermentation industry and ozone oxidation on concentrates from the same membrane treatment system. The results obtained from the ultrafiltration (UF) and/or the reverse osmosis (RO) systems indicate that membrane treatment are very effective for COD, Color, NH₃-N and conductivity removal. Ozone oxidation of the membrane concentrates was tested to increase biodegradability of the wastes. The initial ratios of Biochemical oxygen demand (BOD₅) to Chemical oxygen demand (COD) were increased significantly by applying chemicaloxidation with O₃ and O₃ + H₂O₂.