Leachate recirculation: moisture content assessment by means of a geophysical technique.
Bioreactor technology is a waste treatment concept consisting in speeding up the biodegradation of landfilled waste by optimizing its moisture content through leachate recirculation. The measurement of variations in waste moisture content is critical in the design and control of bioreactors. Conventional methods such as direct physical sampling of waste reach their limits due to the interference with the waste matrix. This paper reviews geophysical measurements such as electrical direct current and electromagnetic slingram methods for measuring the electrical conductivity. Electrical conductivity is a property, which is linked to both moisture and temperature and can provide useful indications on the biodegradation environment in the waste mass. The study reviews three site experiments: a first experimentation shows the advantages (correlation between conductive anomaly and water seepage) but also the limits of geophysical interpretation; the two other sites allow the leachate recirculation to be tracked by studying the relative resistivity variation versus time from electrical 2D imaging. Even if some improvements are necessary to consider geophysical measurements as a real bioreactor monitoring tool, results are promising and could lead to the use of electrical 2D imaging in bioreactor designing.
Guérin
Roger
R
UMR 7619 Sisyphe, Pierre et Marie Curie (Paris 6) University, case 105, 4 place Jussieu, 75252 Paris Cedex 05, France. guerin@ccr.jussieu.fr
Munoz
Marie Laure
ML
Aran
Christophe
C
Laperrelle
Claire
C
Hidra
Mustapha
M
Drouart
Eric
E
Grellier
Solenne
S
D019149:Bioreactors; D055590:Electromagnetic Phenomena; D004784:Environmental Monitoring; D005160:Facility Design and Construction; D055593:Geological Phenomena; D005844:Geology; D012037:Refuse Disposal; D012995:Solubility; D014867:Water / Q000032:analysis; D014872:Water Movements
D014867:Water