EN FR
GeoConferences.ca

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 ORCID logo

In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical Conference

Session: 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.

Please include this code when submitting a data update: GEO2014_359

Access this article:
Canadian Geotechnical Society members can access to this article, along with all other Canadian Geotechnical Conference proceedings, in the Member Area. Conference proceedings are also available in many libraries.

Cite this article:
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
}