An examination of the relative dissolution of two gravels in acetic acid and impact on leachate collection system performance
P.T. Saheli, F. Gondim, B. Forrestal, R.K. Rowe
In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical ConferenceSession: Geoenvironmental Engineering
ABSTRACT: The potential dissolution of two different types of carbonate based gravels (Michigan gravel with 98% dolomite and Beachville gravel with 47% dolomite) in acetic acid solution (pH5) is examined at 40°C and room temperature. During the two-month experiment, Michigan gravel lost 0.5 % mass at room temperature (corresponds to 3.2% mass loss per year) and 3.6 - 3.7 % mass at 40°C (23% per year). For Beachville gravel the mass losses were 0.8-1.0 % at room temperature (5.8%/year) and 3.4-4.1% at 40°C (22-26%/year). With increasing pH or temperature, calcite solubility decreases which leads to increase in precipitation. The design implications of stones with a wide range of calcite levels (0 and 31.7%) on leachate collection system performance were reviewed. It is expected that a landfill drainage layer built with the Michigan stone will have lower clogging rate and longer service life.
RÉSUMÉ: Le potentiel de dissolution de deux types différents de graviers à base de carbonate (gravier du Michigan avec 98% de dolomite et gravier de Beachville avec 47% de dolomite) dans une solution d'acide acétique (pH5). Au cours des deux mois d™expérience le gravier du Michigan a perdu 0.5 % de sa masse à température ambiante et entre 3.6 et 3.7 % de sa masse à 40°C. Pour le gravier de Beachville les pertes de masse étaient de 0.8 à 1.0 % à température ambiante (5.8% par an) et de 3.4 à 4.1 % à 40°C (de 22 à 26% par an). Avec l™augmentation du pH ou de la température la solubilité de la calcite diminue ce qui conduit à l™augmentation de la précipitation. Il est anticipé qu'une couche de drainage d'enfouissement construite avec de la pierre du Michigan aura moins tendance à se boucher et aura une durée de vie plus longue.
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P.T. Saheli; R.K. Rowe; F. Gondim; B. Forrestal (2014) An examination of the relative dissolution of two gravels in acetic acid and impact on leachate collection system performance in GEO2014. Ottawa, Ontario: Canadian Geotechnical Society.
@article{GeoRegina14Paper359,
author = P.T. Saheli; R.K. Rowe; F. Gondim; B. Forrestal,
title = An examination of the relative dissolution of two gravels in acetic acid and impact on leachate collection system performance,
year = 2014
}
title = An examination of the relative dissolution of two gravels in acetic acid and impact on leachate collection system performance,
year = 2014
}