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Experimental study of domestic waste material using magnetic resonance measurements
Author(s) -
Clément Rémi,
Legchenko Anatoly,
Quetu Mathieu,
Descloitres Marc,
Oxarango Laurent,
Guyard Hélène,
Girard JeanFrançois
Publication year - 2011
Publication title -
near surface geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.639
H-Index - 39
eISSN - 1873-0604
pISSN - 1569-4445
DOI - 10.3997/1873-0604.2010069
Subject(s) - earth's magnetic field , environmental science , homogeneity (statistics) , radioactive waste , waste disposal , groundwater , magnetic field , materials science , nuclear magnetic resonance , geology , waste management , geotechnical engineering , engineering , physics , statistics , mathematics , quantum mechanics
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 NUMIS LITE 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 < 10 ms andT 2 * < 10 ms ), existing large‐scale MRS instrumentation is not adapted to the investigation of domestic waste landfills.