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Experimental study of domestic waste material using magnetic resonance measurements

R. Clément 1 A. Legchenko 2 M. Quetu 1 M. Descloitres 2 L. Oxarango 3 H. Guyard 1 Jean-François Girard 4
2 HYBIS
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
3 Transpore
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
Abstract : In this paper, we present results of a laboratory and in situ study of a domestic waste landfill using magnetic resonance measurements. For our study, we used a laboratory Earth's field nuclear magnetic resonance (NMR) instrument developed at LTHE and a large-scale commercial magnetic resonance sounding (MRS) system NUMISLITE from IRIS Instruments. We show that NMR could be a tool for investigating different processes in water-saturated waste samples. Our results show that domestic waste material contains ferromagnetic or paramagnetic particles that perturb the homogeneity of the geomagnetic field at a microscopic scale and render an NMR signal short. Consequently, only the spin echo technique can be applied for measuring. At a macroscopic scale, waste and different buried objects may also perturb the natural geomagnetic field. While investigating the landfill, we observed that magnetic anomalies (±2500 nT) are localized around some cells. This is probably linked to the presence of a higher percentage of metallic objects within the waste disposal. Our first appraisal of the possibility of investigating water-saturated waste in a laboratory using an Earth's field NMR instrument shows that, with existing instruments, waste samples can be studied when the dry density of waste is less than approximately 450 kg/m3. Because the relaxation times of magnetic resonance signals in landfill may be short (T2 < 100 ms and T2*<10 ms), existing large-scale MRS instrumentation is not adapted to the investigation of domestic waste landfills.
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Submitted on : Monday, December 5, 2011 - 10:45:27 AM
Last modification on : Wednesday, October 14, 2020 - 3:48:40 AM

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R. Clément, A. Legchenko, M. Quetu, M. Descloitres, L. Oxarango, et al.. Experimental study of domestic waste material using magnetic resonance measurements. Near Surface Geophysics, European Association of Geoscientists and Engineers (EAGE), 2011, 9 (2), pp.179-185. ⟨10.3997/1873-0604.2010069⟩. ⟨insu-00648110⟩

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