Skip to Main content Skip to Navigation
Journal articles

Optimisation of sludge pretreatment by low frequency sonication under pressure

Abstract : This work aims at optimizing sludge pretreatment by non-isothermal sonication, varying frequency, US power (P-US) and intensity (I-US varied through probe size), as well as hydrostatic pressure and operation mode (continuous vs. sequential - or pulsed - process). Under non isothermal sonication sludge solubilization results from both ultrasound disintegration and thermal hydrolysis which are conversely depending on temperature. As found in isothermal operation: - For a given specific energy input, higher sludge disintegration is still achieved at higher PUS and lower sonication time. - US effects can be highly improved by applying a convenient pressure. - 12 kHz always performs better than 20 kHz. Nevertheless the optimum pressure depends not only on P-US and I-US, but also on temperature evolution during sonication. Under adiabatic mode, a sequential sonication using 5 min US-on at 360 W, 12 kHz, and 3.25 bar and 30 min US-off gives the best sludge disintegration, while maintaining temperature in a convenient range to prevent US damping.
Complete list of metadata

Cited literature [26 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01264379
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Friday, March 4, 2016 - 10:21:16 AM
Last modification on : Friday, February 5, 2021 - 12:30:03 PM
Long-term archiving on: : Sunday, June 5, 2016 - 10:12:22 AM

File

LBARTHE_ID14646.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Ngoc Tuan Le, Carine Julcour-Lebigue, Laurie Barthe, Henri Delmas. Optimisation of sludge pretreatment by low frequency sonication under pressure. Journal of Environmental Management, Elsevier, 2016, 165, pp.206-212. ⟨10.1016/j.jenvman.2015.09.015⟩. ⟨hal-01264379⟩

Share

Metrics

Record views

124

Files downloads

266