Clément R., Legchenko Anatoli, Quetu M., Descloitres Marc, Oxarango L., Guyard Hélène, Girard J. F. (2011). Experimental study of domestic waste material using magnetic resonance measurements. Near Surface Geophysics, 9 (2), p. 179-185. ISSN 1569-4445.
Titre du document
Experimental study of domestic waste material using magnetic resonance measurements
Clément R., Legchenko Anatoli, Quetu M., Descloitres Marc, Oxarango L., Guyard Hélène, Girard J. F.
Source
Near Surface Geophysics, 2011,
9 (2), p. 179-185 ISSN 1569-4445
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/m(3). Because the relaxation times of magnetic resonance signals in landfill may be short (T-2 < 100 ms and T-2*<10 ms), existing large-scale MRS instrumentation is not adapted to the investigation of domestic waste landfills.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Hydrologie [062]
;
Géologie et formations superficielles [064]
