Effect of ultrasound on activity of activesludge in municipal sewage plant
To improve the activity of activatesludge in municipal sewage plants and the biological activity of sludge in biochemical ponds,ultrasound(US)under different working conditions were introduced to treat activatesludge in a sewage plant.In the experiment,the activatesludge was treated by US equipment with a frequency of 40 kHz,a power density of 0.05,0.33 W·cm-2,and a power of 30,50,500 W,respectively.The oxygen uptake rate(OUR)of activated sludge was measured by a simple method to determine the change of activated sludge activity change in activated sludge activity.The results showed that OUR efficiency was the best when the US power was 500 W,the US intensity was 0.33 W·cm-2,and the action time was less than 5 min.The sludge activity was especially improved at low temperatures.Low-intensity US has no obvious effect on activatesludge OUR and longtime US will accelerate the aging of activatesludge.Conclusion:Applying US to activatesludge in municipal sewage biochemical ponds can effectively improve its activity and improve the efficiency of biological nitrogen removal in winter.
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