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Optimisation of sludge pretreatment by low frequency sonication under pressure

Le, Ngoc Tuan and Julcour-Lebigue, Carine and Barthe, Laurie and Delmas, Henri Optimisation of sludge pretreatment by low frequency sonication under pressure. (2016) Journal of Environmental Management, vol.165. pp.206-212. ISSN 0301-4797

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Official URL: http://dx.doi.org/10.1016/j.jenvman.2015.09.015

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.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Environmental Management website : http://www.sciencedirect.com/science/article/pii/S030147971530267X
HAL Id:hal-01264379
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Other partners > Ho Chi Minh City University of Science - HCMC (VIETNAM)
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Deposited By: Laurie BARTHE
Deposited On:15 Jan 2016 07:52

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