Effects of ultrasound pretreatment of sludge on anaerobic digestion

Kuan-Yeow Show; Taohong Mao; Joo-Hwa Tay; Duu-Jong Lee

Effects of ultrasound pretreatment of sludge on anaerobic digestion

Kuan-Yeow Show, Taohong Mao, Joo-Hwa Tay, Duu-Jong Lee

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Abstract

The effects of low frequency ultrasound on sludge solids disintegration and the feasibility of sonication pretreatment for continuous digester operation were examined in the laboratory. The results suggested that higher sonication intensities are able to Initiate a larger number of transient cavitation bubbles resulting In greater sludge disintegration, which was evidenced by marked particle size reduction and soluble organics enhancement. Comparing the control digester fed with untreated sludge, the chemical oxygen demand (COD) removal increased by 5-32%, 7-51% and 11-59% in the digesters fed with sludge sonicated at intensities of 32 W/cm²,56 W/cm² and 92 W/cm ², respectively under continuous operation. The improved COD removal efficiency corresponded with the increase in biogas production by 45-202%, 184-220% and 115-205% In the respective digesters, as well as an overall increase by up to 22% in methane composition. Greater improvement over the control digester was observed at higher organic loading rates (OLRs). Biogas depression was observed from digesters treating sludge sonicated with higher intensities likely caused by the accumulation of excessive volatile fatty acids (VFAs) under continuous digester operation. © 2006 DEStech Publications, Inc.

Original language	English
Pages (from-to)	51-59
Journal	Journal of Residuals Science and Technology
Volume	3
Issue number	1
Publication status	Published - Jan 2006
Externally published	Yes

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title = "Effects of ultrasound pretreatment of sludge on anaerobic digestion",

abstract = "The effects of low frequency ultrasound on sludge solids disintegration and the feasibility of sonication pretreatment for continuous digester operation were examined in the laboratory. The results suggested that higher sonication intensities are able to Initiate a larger number of transient cavitation bubbles resulting In greater sludge disintegration, which was evidenced by marked particle size reduction and soluble organics enhancement. Comparing the control digester fed with untreated sludge, the chemical oxygen demand (COD) removal increased by 5-32%, 7-51% and 11-59% in the digesters fed with sludge sonicated at intensities of 32 W/cm2,56 W/cm2 and 92 W/cm 2, respectively under continuous operation. The improved COD removal efficiency corresponded with the increase in biogas production by 45-202%, 184-220% and 115-205% In the respective digesters, as well as an overall increase by up to 22% in methane composition. Greater improvement over the control digester was observed at higher organic loading rates (OLRs). Biogas depression was observed from digesters treating sludge sonicated with higher intensities likely caused by the accumulation of excessive volatile fatty acids (VFAs) under continuous digester operation. {\textcopyright} 2006 DEStech Publications, Inc.",

author = "Kuan-Yeow Show and Taohong Mao and Joo-Hwa Tay and Duu-Jong Lee",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected]. ",

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AU - Show, Kuan-Yeow

AU - Mao, Taohong

AU - Tay, Joo-Hwa

AU - Lee, Duu-Jong

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2006/1

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N2 - The effects of low frequency ultrasound on sludge solids disintegration and the feasibility of sonication pretreatment for continuous digester operation were examined in the laboratory. The results suggested that higher sonication intensities are able to Initiate a larger number of transient cavitation bubbles resulting In greater sludge disintegration, which was evidenced by marked particle size reduction and soluble organics enhancement. Comparing the control digester fed with untreated sludge, the chemical oxygen demand (COD) removal increased by 5-32%, 7-51% and 11-59% in the digesters fed with sludge sonicated at intensities of 32 W/cm2,56 W/cm2 and 92 W/cm 2, respectively under continuous operation. The improved COD removal efficiency corresponded with the increase in biogas production by 45-202%, 184-220% and 115-205% In the respective digesters, as well as an overall increase by up to 22% in methane composition. Greater improvement over the control digester was observed at higher organic loading rates (OLRs). Biogas depression was observed from digesters treating sludge sonicated with higher intensities likely caused by the accumulation of excessive volatile fatty acids (VFAs) under continuous digester operation. © 2006 DEStech Publications, Inc.

AB - The effects of low frequency ultrasound on sludge solids disintegration and the feasibility of sonication pretreatment for continuous digester operation were examined in the laboratory. The results suggested that higher sonication intensities are able to Initiate a larger number of transient cavitation bubbles resulting In greater sludge disintegration, which was evidenced by marked particle size reduction and soluble organics enhancement. Comparing the control digester fed with untreated sludge, the chemical oxygen demand (COD) removal increased by 5-32%, 7-51% and 11-59% in the digesters fed with sludge sonicated at intensities of 32 W/cm2,56 W/cm2 and 92 W/cm 2, respectively under continuous operation. The improved COD removal efficiency corresponded with the increase in biogas production by 45-202%, 184-220% and 115-205% In the respective digesters, as well as an overall increase by up to 22% in methane composition. Greater improvement over the control digester was observed at higher organic loading rates (OLRs). Biogas depression was observed from digesters treating sludge sonicated with higher intensities likely caused by the accumulation of excessive volatile fatty acids (VFAs) under continuous digester operation. © 2006 DEStech Publications, Inc.

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M3 - RGC 21 - Publication in refereed journal

SN - 1544-8053

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JO - Journal of Residuals Science and Technology

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Effects of ultrasound pretreatment of sludge on anaerobic digestion

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