Study On Treatment Of Molasses Alcohol Wastewater By Modified Bentonite

Bentonite is an aqueous aluminosilicate clay mineral. As it has some special physical and chemical properties, it is widely used in industrial and agricultural production. Recently, the modified bentonite is substituted for the activated carbon in wastewater treatment, and especially in organic wastewater treatment. The application of bentonite and modified bentonite in wastewater treatment has been emphasized and investigated by environmentalists.There is abundance storage of bentonite in Guangxi Province. Research of modified bentonite and development of it's application are of highly practical importance. Moreover, the light and chemical industry is prosperous in Guangxi, while large amount of organic wastewater is discharged and cause serious pollution. So there is a perspective application of modified bentonite in organic wastewater treatment. In view of reasons said above, the study on treatment of molasses alcohol wastewater by modified bentonite had been carried out in this paper.Based on our early work, Na-bentonite and organobentonite wereprepared, and both two kinds of modified bentonite were used to treat the molasses alcohol wastewater. The experiment results show that the organobentonite has a high ability of adsorption and decoloration for the wastewater, and the decolouring ratio can reach 80%. The adsorption behaviour of molasses alcohol wastewater can be well represented by freundich model and monolayer Langmuir model. The feasible treating conditions of molasses alcohol wastewater by organobentonite are obtained as follows: organobentonite concentration is 5g, pH value is 9, adsorption temperature is 30 C, adsorption time is 30 min for 100mL alcohol wastewater.Catalytic oxidation and adsorption process for the molasses alcohol wastewater was also investigated by using the Fe-pillared bentonite as catalyst of Fenton reaction. The experimental results show that the disadvantages of traditional homogeneous catalysis were eliminated and the treatment effect had been improved effectively. The optimal treatment conditions are obtained as follows: pH value is about 4.2-4.5, amount of Fe-pillared bentonite added is 11g, temperature is 40 C, amount of H2O2 added is 7.5mL, and treatment time is 7h for 100mL alcohol wastewater.At last, the feasibility of the modified bentonite in biochemical oxidation-adsorption treatment for molasses wastewater had been given in the paper.