Sewage sludge disruption through sonication to improve the co-preparation of coal–sludge slurry fuel: The effects of sonic frequency

Sewage sludge disruption through sonication to improve the co-preparation of coal–sludge slurry... •Sonication with different frequencies is used to disrupt sludge flocs.•The disrupted sludge is mixed with coal to prepare coal–sludge slurry.•Effects of sonic frequency on reducing slurry viscosity are studied.•Low-frequency sonication generates more intense cavitation effects.•Low-frequency sonication has more obvious effects of reducing slurry viscosity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Thermal Engineering Elsevier

Sewage sludge disruption through sonication to improve the co-preparation of coal–sludge slurry fuel: The effects of sonic frequency

Sewage sludge disruption through sonication to improve the co-preparation of coal–sludge slurry fuel: The effects of sonic frequency

Applied Thermal Engineering 99 (2016) 645–651 Contents lists available at ScienceDirect Applied Thermal Engineering journal homepage: www.elsevier.com/locate/apthermeng Research Paper Sewage sludge disruption through sonication to improve the co- preparation of coal–sludge slurry fuel: The effects of sonic frequency a, b a a Ruikun Wang *, Jianzhong Liu , Yukun Lv , Xuemin Ye Department of Power Engineering, North China Electric Power University, Baoding, Hebei Province 071003, China State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China HIGHLIGHTS Sonication with different frequencies is used to disrupt sludge flocs. The disrupted sludge is mixed with coal to prepare coal–sludge slurry. Effects of sonic frequency on reducing slurry viscosity are studied. Low-frequency sonication generates more intense cavitation effects. Low-frequency sonication has more obvious effects of reducing slurry viscosity. ARTICLE INF O ABS TRA CT Article history: The sewage sludge volume has been increasing annually, and if not treated properly, this sludge endan- Received 28 August 2015 gers the environment and human health. Sludge can be considered as a carbon-containing material, and Accepted 10 January 2016 the energy within is utilized easily and economically by blending it with coal to prepare a slurry fuel Available online 29 January 2016 called coal–sludge slurry (CSS). However, sludge is always disrupted before CSS preparation because of its high bound water content and viscosity. In this study, sonication was performed to disrupt sludge Keywords: and to enhance co-slurrying with coal. The effects of sonic frequency were highlighted, and the results Sludge recycling showed that low-frequency sonication significantly reduces viscosity. Moreover, this process improved Sonication −1 CSS slurrying. The characteristic viscosity (the apparent viscosity measured at a shear rate of 100 s )of Coal water slurry CSS...
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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
1359-4311
eISSN
1873-5606
D.O.I.
10.1016/j.applthermaleng.2016.01.098
Publisher site
See Article on Publisher Site

Abstract

•Sonication with different frequencies is used to disrupt sludge flocs.•The disrupted sludge is mixed with coal to prepare coal–sludge slurry.•Effects of sonic frequency on reducing slurry viscosity are studied.•Low-frequency sonication generates more intense cavitation effects.•Low-frequency sonication has more obvious effects of reducing slurry viscosity.

Journal

Applied Thermal EngineeringElsevier

Published: Apr 25, 2016

References

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