TREATMENT OF WASTEWATER FROM MOLASSES-BASED ALCOHOL DISTILLERIES BY UV/O3 OXIDATION PROCESS

Abstract

The treatment of wastewater from molasses – based alcohol distilleries in Viet Nam is still an unmanageable problem. This kind of wastewater contains high organic components which is difficult to biodegradation. Survey results on molasses – based alcohol distilleries waste water after biological treatment determined that the composition of wastewater also contains a considerable amount of organic compounds with high COD about 1300 - 1800 mg/L. Research results on wastewater after biodegradation in laboratory conditions by using advanced oxidation technologies demonstrated that the UV/ozone oxidation system is more efficient than the Ozone system UV OZONE in which the COD and colour treatment efficiency is higher from 4,2 – 22%. By using modeling method with the 5.0 software mode, this study determined the optimal reaction conditions for the model UV / ozone: pH = 9, O3 concentration = 54 mg/h; UV power = 8W/h. The treatment efficiency can reach 100% and 93% of colour and COD respectively after 120 minutes. The study also demonstrated that the presence of anions such as Cl-, SO42-, HCO3- had a significant impact on the efficiency of the oxidation process.