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Accueil du site → Doctorat → États-Unis → 1999 → Minimum requirements for municipal solid waste landfill in the State of Kuwait

University of Florida (1999)

Minimum requirements for municipal solid waste landfill in the State of Kuwait

Al-Yaqout, Anwar F

Titre : Minimum requirements for municipal solid waste landfill in the State of Kuwait

Auteur : Al-Yaqout, Anwar F

Université de soutenance : University of Florida

Grade : Doctor of Philosophy (PhD) 1999

Résumé
The environment and human health in the State of Kuwait are threatened from improper Municipal Solid Waste (MSW) disposal management. MSW landfills in Kuwait act as dumping grounds rather than safe disposal sites. Basic tools that assist in protecting the environment are not included in these systems. Such tools include a base liner, final cover, gas collection system, and leachate collection system. In an effort to help Kuwait Municipality to build safe MSW sites that are environmentally acceptable and cost effective, laboratory and field tests were conducted on the natural calcareous layer of sand (gatch) to study its applicability as liner and cover systems. In addition, Pollutev6 software was used to study contaminant migration through the gatch layer. Furthermore, a high-density polyethylene (HDPE) liner that was exposed to the environment was tested for its tensile stresses and tear resistance in order to identify its workability in the field. Laboratory tests included permeability assessment using triaxial tests and falling head tests where field tests were conducted by two-stage borehole permeability tests. Laboratory results indicated that gatch sands are considered a low permeability soil when compacted at optimum moisture content and maximum dry density. Permeability values as low as 4.0 × 10 -7 and 0.7 × 10-8 cm/sec were recorded by both lab tests. A field test program was conducted on both natural gatch deposits and compacted gatch pads. Permeability from the natural deposit suggested that gatch deposits at great depths could be considered as secondary barrier system in the liner. Similarly, permeability values of compacted gatch were between 3.0 × l0 -5 and 16.7 × 10-5 cm/sec. Upon desiccation, permeabilities of compacted gatch decreased by one magnitude. On the other hand, drying and wetting cycles conducted on the pads and in the lab had increased permeabilities by one magnitude. In the field, gatch can be compacted at 95% of maximum dry density but at moisture contents always dry of optimum. Gatch compaction at dry of optimum may explain the minimal effect of cracking and shrinkage at the layer. Analysis of Pollutev6 models show that gatch will minimize the migration of contaminant where concentrations diminish at 10-m depth of the gatch layer after 200 years. HDPE testing pointed out that Young’s Modulus and strength of the liner decrease after long periods of field application, and HDPE tends to accumulate moisture below its surface which keeps the gatch liner at high moisture contents. The permeability values of the gatch liner at the pad that consists of a composite liner system had decreased after six months. Overall, compacted gatch sands are recommended for use in Kuwait as liner and cover systems without HDPE liners. The liner system should include a leachate collection system, although Kuwait landfill classification model does not require these systems based on climatic water balance.

Mots clés : Sanitation, Applied sciences, Landfill, Kuwait, Solid waste, Civil engineering ]

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