Evaluating the excess sludge reduction in activated sludge system with ultrasonic treatment

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Shuang WuChengwen Wang

Abstract

Ultrasonic treatment for enhancing biological processes has recently attracted considerable attention in wastewater treatment. In this study, we systematically investigated the mixed liquor properties of activated sludge under ultrasonic treatment. The sludge samples were collected from the aerobic tank of a full-scale membrane bioreactor (MBR) treating municipal wastewater, and the volatile suspended solids (VSS) concentration was approximately 6.0 g/L. The results showed that ultrasonic treatment induced floc disintegration, organics release, temperature increase, microbial activity and pH variation. The maximum mg soluble chemical oxygen demand (COD) per mg VSS released was estimated to be 0.147 using the Monod equation. The exponential increase in the concentration of dissolved organic matter is related to the loss of relative heterotrophic bacterial activity. A sonolysis-cryptic growth model was demonstrated to be capable of describing ultrasonic sludge reduction, which would support the further development of ultrasonic treatment technology in activated sludge systems.

References

Jun 7, 2003·Biotechnology Progress·William G Pitt, S Aaron Ross
Mar 28, 2009·Trends in Biotechnology·Ekaterina V RokhinaJurate Virkutyte
May 18, 2010·Ultrasonics Sonochemistry·Sridhar PilliR Y Surampalli
Dec 19, 2015·Environmental Science & Technology·Min ZhengWeimin Wu

❮ Previous
Next ❯

Related Concepts

Related Feeds

Bioreactors (ASM)

Bioreactors are important devices or systems that utilize living cells or enzymes for a chemical process. These devices carefully control and monitor the environment factors such as pH, nutrients level, and temperature, which can affect the yield in a given process. Discover the latest research here.

Related Papers

Water Science and Technology : a Journal of the International Association on Water Pollution Research
J C Leyva-DíazJ M Poyatos
Biotechnology and Bioengineering
P S KodukulaR Y Surampalli
Water Science and Technology : a Journal of the International Association on Water Pollution Research
Kyung-Nan MinAnna Mermelstein
Water Science and Technology : a Journal of the International Association on Water Pollution Research
J C Leyva-Díaz, J M Poyatos
© 2022 Meta ULC. All rights reserved