The influence of energy input on the particle size of disintegrated excess sludge in the ultrasonic disintegration process

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Łukasz Skórkowski, Ewa Zielewicz

Abstract

The objective of this research was to examine the influence of energy input on the particle size distribution of disintegrated sludge. The change of particle size distribution indicates the deagglomeration of flocs and disruption of micro-colonies. As the digestibility of sludge increases with dispersion, particle size analysis is an important factor in evaluating the disintegration process. Four different levels of energy input were used in the research: 10-100 kWh·m-3. All samples showed significant changes as far as dispersion (kdCST = 22.98-74.67, kdFCOD = 3.23-18.46), lysis (kdSCOD = 4.22-12.09), acidification (kdVFAs = 1.78-12.61), nitrogen release (kdTN = 4.02-21.61) indicators were concerned. Results indicate the gradual decrease of measured particle size with increasing energy input. The energy supplied to the disintegration process primarily promotes deagglomeration and with the rise of energy input, the destruction of cells. For EV = 50 and 100 kWh·m-3 an increased occurrence of lysis effects and increase in particle fraction <99.9 μm was noted. The highest efficiency evaluated by increase of filtered chemical oxygen demand (FCOD) and soluble COD (SCOD) per unit of volumetric energy - ΔCOD and ΔSCOD (mgO2·Wh-1) was o...Continue Reading

References

Aug 11, 2007·Water Research·Kuan-Yeow ShowDuu-Jong Lee
May 18, 2010·Ultrasonics Sonochemistry·Sridhar PilliR Y Surampalli
Aug 17, 2010·Journal of Hazardous Materials·H CarrèreI Ferrer
Sep 14, 2016·Topics in Current Chemistry·Ewa Zielewicz
Jul 19, 2017·Water Research·Jianwei ZhaoQi Yang

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Citations

Aug 20, 2021·Bioresource Technology·Pilli SridharRao Y Surampalli

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