Research On The Influences Of Beer Industry Sludge Disintegration By Ultrasonic-Fenton Process

In this study, the beer industry excess sludge was treated by applying the techniques of ultrasonic, Fenton oxidation and ultrasonic-Fenton oxidation, and the parameters of pH, the dosage of Fe2+and H2O2, reaction time and temperature, ultrasonic power and time on the effect of sludge disintegration were investigated, to gain the optimum conditions in these three techniques. In the meantime, the disintegration effects of sludge treated by ultrasonic, Fenton oxidation and ultrasonic-Fenton oxidation techniques were compared, aiming to find an effectively feasible technique for the disposal of industry sludge.Under the condition of Fe2+dosage=0.0g/L and reaction temperature=60℃, The Fenton oxidation treatment results showed that the optimal operational conditions were pH=2.1, reaction time=82min, H2O2dosage=13g/L, by Response surface Methodology. And the ultrasonic treatment results showed that the optimal operational conditions were ultrasonic power=100w and ultrasonic time=30min. At the same time, the ultrasonic-Fenton oxidation treatment results showed that under the conditions of ultrasonic power=100w and ultrasonic time=30min, the optimal operational conditions were Fe2+dosage=0g/L, pH=2.5, reaction time=30min, and H2O2dosage=6g/L. The synergistic effect of ultrasonic technique combined with Fenton oxidation had discussed. After ultrasonic-Fenton oxidation treatment the SCOD/TCOD of sludge was30.01%, it was greater than effect of the sum of singe using ultrasonic and Fenton oxidation. Combined with the analysis of micro and apparent effect, the result showed that the effect of sludge disintegration by ultrasonic-Fenton oxidation better than by ultrasonic or Fenton oxidation alone. Not only could the ultrasonic cavitation improve the yield of hydroxyl radicals, but also the ultrasonic mechanical could improve the mass transfer, which promoted the Fenton reaction effectively. Moreover, a large amount of oxygen could make solution in oxygen saturation state, producing by Fenton oxidation reaction, which could strengthen the ultrasonic cavition. Meanwhile, the Fe2+could play a catalytic role, promoting the yield of hydroxyl radicals, increasing the system of oxidation.The study results show that compared to the singe use ultrasonic or Fenton oxidation to disintegrate beer industrial sludge, the ultrasonic-Fenton oxidation could greatly improve the reaction efficiency and shorten the reaction time. It is a good way to disintegrate sludge of food industry. The research can provide certain theoretical reference for the food industry of sludge treatment and engineering application.