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Version prliminaire non publie MODIFICATION OF OXYGEN-CONSUMPTION TESTING FOR THE
 

Summary: Version préliminaire ­ non publiée
MODIFICATION OF OXYGEN-CONSUMPTION TESTING FOR THE
EVALUATION OF OXYGEN BARRIER PERFORMANCE
Bruno Bussière, Industrial NSERC Polytechnique-UQAT Chair on Environment and Mine Waste
Management, UQAT, Rouyn-Noranda, Québec
Anne-Marie Dagenais, URSTM - Industrial NSERC Polytechnique-UQAT Chair on Environment and Mine
Waste Management, UQAT, Rouyn-Noranda, Québec
Mamert Mbonimpa, Industrial NSERC Polytechnique-UQAT Chair on Environment and Mine Waste
Management, École Polytechnique, Montréal, Québec
Michel Aubertin, Industrial NSERC Polytechnique-UQAT Chair on Environment and Mine Waste
Management, École Polytechnique, Montréal, Québec
ABSTRACT: Covers with capillary barrier effects (CCBE) are now considered by the mining industry as a viable option
for oxygen diffusion barriers. Different techniques have been proposed to evaluate the efficiency of an oxygen diffusion
barrier used to control the production of acid mine drainage (AMD). One recent development is the Oxygen-Consumption
(OC) method. The method consists of measuring the decrease in oxygen concentration over a relatively short period of
time in an air filled chamber above the cover. This decrease in O2 concentration is then converted into an instantaneous
oxygen flux by using fundamental Fick's laws. However, this approach, developed initially to determine the oxidation rate
of sulphide tailings, is not well adapted for a low oxygen flux like that observed through a CCBE. The standard OC
method was modified by the authors to increase the precision of gas flux measurements through a cover. The study
showed that the measurements with the modified approach give more realistic oxygen flux through a CCBE cover, when

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies