Study on Photocatalytic Degradation of Molasses Alcoholic Wastewater With Ozone

The degradations of molasses alcoholic wastewater by combination of the solid-state Bi2O3-WO3-based photocatalyst and ozonation was investigated.The color of the molasses alcoholic wastewater were analyzed by ultraviolet and visible spectra(UV-Vis),while the mineralization process was characterized by measuring its decolorization rate.The main operating variables affecting photo-catalytic ozonation efficiencies of wastewater from cane molasses alcoholic fermentation were studied.Semi-batch experiments were performed in order to analyze the influences of catalysts dosage,illumination time,ozone dosage and pH on color and organic matter removal.The experimental results show that the combined photocatalysis with UV irradiation and ozonation (catalyst /UV/O3) process can considerably increase color removal rate.Optimum Catalyst dosage and Ozone dosage are 0.25 g/L and 0.062 g/h,respectively.The effect of the pH is very important.Under high alkaline or acidity conditions,Decolorization rate can increase to 90%.