Influence of cement and clay on contaminated site soil

M. Allagoa

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Soil Stabilization III

ABSTRACT: Soil contamination involving heavy metals and hydrocarbons is a major problem facing the environment management community. Stabilisation/solidification (S/S) has emerged as an efficient method for the treatment of certain hazardous wastes and contaminated widely used. S/S technologies include a wide range of similar processes that involve mixing inorganic cementitious or pozzolanic binders. In this study, Portland cement and inorganoapplied to stabilize/solidify contaminated made ground soil. The test performed were density, unconfined compressive strength, leachate pH and leachability of both metals and organics. Result shows that binders were able to reduce contaminants under the various tests that were carried out.

RÉSUMÉ: La contamination des sols impliquant les métaux lourds et les hydrocarbures est un problème majeur pour la gestion environnementale de la communauté. La stabilisation/solidification (S/S) a émergé comme une méthode efficace pour le traitement de et a été largement utilisé. Les technologies S/S comprennent un large éventail de processus similaires qui impliquent des mélanges inorganiques à base de ciment ou de liants pouzzolaniques. Dans cette étude,le ciment Portland et une argile inorganostabiliser/solidifier les sols contaminés de terrain composérésistance en compression simple, leorganiques. Les résultats montrent que les liants ont réussi à réduire les contaminants lors des différents tests qui ont été effectués. Key words: Solidification/stabilisation, cement, inorgano 1. INTRODUCTION Stabilization/Solidification (S/S) include simple pre-landfill waste treatment processes that are used to treat hazardous wastes. When mixed into the waste, cement and other pozzolanic bindeform a network of hydration products that bind and encapsulate the waste into a new monolithic material. The EU Landfill Directive will almost certainly result in increased use of S/S for UK hazardous wastes, as this remains the next cheapest option to co-disposal fial.2005)fl. S/S has been used on increasing projects in the UK over the past decade. The advantages include speed of implementation, use of wellestablished equipment and techniques; reduce risks to site workers, facilitation of rapid development of the site and reduction of offSolidification/Stabilization (S/S) reduces the hazardous potential of contaminated sites by converting the contaminants into their least soluble, mobile, toxic form, thus minimizing migration offsite. Many mixing agents are not effective in immobilizing organic contaminants.Solidification/Stabilization is well established in the remediation of metals while its effectiveness for organics is far less successful becauorganics interfere with the hydration processes of the binders fi(LaGrega et al. 1994)fl. However, recent studies indicate that INFLUENCE OF CEMENT AND CLAY ON CONTAMINATED SITE SOIL Soil contamination involving heavy metals and hydrocarbons is a major problem facing the environment management community. Stabilisation/solidification (S/S) has emerged as an efficient method for the treatment of certain hazardous wastes and contaminated ground and has become widely used. S/S technologies include a wide range of similar processes that involve mixing inorganic cementitious or pozzolanic binders. In this study, Portland cement and inorgano-organo clay were minated made ground soil. The test performed were density, unconfined compressive strength, leachate pH and leachability of both metals and organics. Result shows that binders were able to reduce contaminants under the various tests that were carried out. La contamination des sols impliquant les métaux lourds et les hydrocarbures est un problème majeur pour la gestion environnementale de la communauté. La stabilisation/solidification (S/S) a émergé comme une méthode efficace pour le traitement de certains déchets dangereux et du sol contaminé et a été largement utilisé. Les technologies S/S comprennent un large éventail de processus similaires qui impliquent des mélanges inorganiques à base de ciment ou de liants pouzzolaniques. ciment Portland et une argile inorgano-organique ont été appliqués pour solidifier les sols contaminés de terrain composé. Les tests effectués étaient la densitérésistance en compression simple, le pH des lixiviats et la lixiviation des métaux et des matières organiques. Les résultats montrent que les liants ont réussi à réduire les contaminants lors des différents tests qui ont été effectués. Key words: Solidification/stabilisation, cement, inorgano-organo clay, laboratory mixing.ion/Solidification (S/S) include relatively landfill waste treatment processes that are used to treat hazardous wastes. When mixed into the waste, cement and other pozzolanic binders form a network of hydration products that bind and encapsulate the waste into a new monolithic material. The EU Landfill Directive will almost certainly result in increased use of S/S for UK hazardous wastes, as this remains the next fi(Cheeseman et . S/S has been used on increasing projects in the UK over the past decade. The advantages include speed of implementation, use of well-established equipment and techniques; reduce risks apid development of the site and reduction of off-site disposal. Solidification/Stabilization (S/S) reduces the hazardous potential of contaminated sites by converting the contaminants into their least soluble, mobile, toxic form, thus minimizing their potential migration offsite. Many mixing agents are not effective in immobilizing organic contaminants. Solidification/Stabilization is well established in the remediation of metals while its effectiveness for organics is far less successful because some hydration processes of . However, recent modified clays, silicates, and some can be used to immobilize organic contaminants.This work has assessed the performance of two alternative binder systems that could potentially be used to treat organic and inorganic contaminant. The aim is to compare the performance of Portland cement (PC) or CEM I and Inorgano(IOC). The main objective of this research is to perform laboratory treatability study on contaminated site soils and the effect of a wide range of variables such as binder dosage, composition, binders and water: cement ratio. Table 1. shows Solidification - Stabilisation of organic contaminants studies on the use of Scontaminants are comparatively less extensive tabbaa and Rose; 1996)fl. Organic compound Modifying agent or systemPhenol - Phenol - Dioxins - Pentachlorophenol (PCP) creosote 2- chloroaniline - Organic halogens (AOX) and - polychlorinated Soil contamination involving heavy metals and hydrocarbons is a major problem facing the environment management community. Stabilisation/solidification (S/S) has emerged as an efficient ground and has become widely used. S/S technologies include a wide range of similar processes that involve mixing inorganic organo clay were minated made ground soil. The test performed were density, unconfined compressive strength, leachate pH and leachability of both metals and organics. Result shows that binders were able to reduce contaminants under the various tests that were carried out. La contamination des sols impliquant les métaux lourds et les hydrocarbures est un problème majeur pour la gestion environnementale de la communauté. La stabilisation/solidification (S/S) a émergé certains déchets dangereux et du sol contaminé et a été largement utilisé. Les technologies S/S comprennent un large éventail de processus similaires qui impliquent des mélanges inorganiques à base de ciment ou de liants pouzzolaniques. organique ont été appliqués pour . Les tests effectués étaient la densité, la taux et des matières organiques. Les résultats montrent que les liants ont réussi à réduire les contaminants lors des organo clay, laboratory mixing. organic binders immobilize organic contaminants. sed the performance of two alternative binder systems that could potentially be used to treat organic and inorganic contaminant. The aim is to compare the performance of Portland cement (PC) or CEM I and Inorgano-organo clay is research is to perform laboratory treatability study on contaminated site soils and the effect of a wide range of variables such as binder dosage, composition, binders and Stabilisation of organic tudies on the use of S-S with organic contaminants are comparatively less extensive fi(Al-Modifying agent or system References Vipulanandan& Krishnan 1990 Vipulanandan, 1995 Bates et al. 2002 Sora et al. 2002 Yilmaz et al. 2003

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