HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Non-destructive quantification of water gradient in sludge composting with Magnetic Resonance Imaging

Abstract : Sludge from a slaughter-house wastewater plant, and mixtures of bulking agent (crushed wood pallet) and sludge were studied by Nuclear Magnetic Resonance (NMR). The NMR spinspin relaxation (T2)and spinlattice relaxation (T1) signals for sludge, wet crushed wood pallet and mixtures of sludge and bulking agent were decomposed into three relaxation time components. Each relaxation time component was explained by a non-homogeneous water distribution on a microscopic length scale and by the porosity of the material. For all samples, the T2 relaxation time value of each component was directly related to the dry matter content. The addition of wet crushed wood to sludge induced a decrease in the relaxation time, explained by water transfer between the sludge and the wood. Magnetic Resonance Imaging (MRI) and respirometric measurements were performed on sludge and wood mixtures. MR images of the mixtures were successfully obtained at different biodegradation states. Based on specific NMR measurements in an identified area located in the MRI cells, the results showed that grey levels of MR images reflected dry matter content. This preliminary study showed that MRI would be a powerful tool to measure water distribution in sludge and bulking agent mixtures and highlights the potential of this technique to increase the understanding of sludge composting.
Mots-clés : IRM
Document type :
Journal articles
Complete list of metadata

Cited literature [28 references]  Display  Hide  Download

Contributor : Migration Irstea Publications Connect in order to contact the contributor
Submitted on : Friday, May 15, 2020 - 4:58:50 PM
Last modification on : Thursday, August 26, 2021 - 1:22:01 PM


Files produced by the author(s)




F.P. Duval, S. Quellec, A. Trémier, C. Druilhe, François Mariette. Non-destructive quantification of water gradient in sludge composting with Magnetic Resonance Imaging. Waste Management, Elsevier, 2010, 30 (4), pp.610-619. ⟨10.1016/j.wasman.2009.09.045⟩. ⟨hal-02593165⟩



Record views


Files downloads