Landfill liners

It is also not tme that vinyl plastics decompose in landfills and give off vinyl chloride monomer, because like all plastics, vinyl is an extremely stable landfill material. It resists chemical attack and degradation, and is so resistant to the conditions present in landfills that it is often used to make landfill liners. On those occasions when vinyl chloride monomer is detected in landfills, it typically can be traced to the presence of other chemicals and solvents. 

The landfill liner, cover, and hydraulic barrier all belong to the subsurface pollutant engineered containment system. The liner is designed at the bottom of a landfill to contain downward leachate. The cover is designed at the top of a landfill to prevent precipitation from infiltrating into the landfill. The hydraulic barrier, or cutoff walls, is a vertical compacted earthen system to contain horizontal flow of plume. The ultimate purpose of these barriers is to isolate contaminants from the environment and, therefore, to protect the soil and groundwater from pollution originating in the landfill or polluted site. 

We use the casting process to make polymer films (less than 0.3 mm thick) and sheets (more than 0.3 mm thick) for such diverse end uses as cling wrap, merchandise bags, roofing membranes, landfill liners, and the interior walls of refrigerators. During chill roll casting, molten polymer is extruded as a curtain from a slot die onto a chilled metal roller where it solidifies. The product is transported over a series of rollers to a winder where it is wound up. 

Hydration antifouling coatings, 7 158 Hydraulic atomizers, 23 175 Hydraulic cements, 5 467, 500-501 Hydraulic-centrifugal classifiers, 22 275 Hydraulic classifiers, 76 619 Hydraulic conductivity, of landfill liners, 25 878... 

Landau-Fermi liquid, 23 840 Landau quasiparticle model, 23 840 Land cost, 9 527 Landering, 8 438-439 Land-farming, 3 768 defined, 3 759t Landfill gas, 25 880 Landfill leachate treatment, reverse osmosis in, 21 646-647 Landfill liners, 25 877-878... 

No water wells were located down gradient from the landfill and significant leaching past the landfill liner was not found hence no further hydrological assessments were undertaken. Airborne emissions from the landfill were characterized by air samples taken at the landfill and airborne concentrations were also measured at the nearest community. 

The principal test to establish the chemical resistance of the polymeric landfill liners to liquid wastes and industrial effluents is the immersion of geomembrane in a sample either of a defined chemical mixture or of a leachate from an existing storage site. This is performed either at various elevated temperatures in order to generate an Arrhenius diagram, or at fixed temperatures of 50 °C and at 20 °C, and is followed by a number of, primarily, mechanical evaluation tests. 

Docking, landfill liners, membranes, swimming pool liners. .. 

Kayabali, K. 1997. Engineering aspects of a novel landfill liner material bentonite-amended natural zeolite. Eng Geology 46 105-114. 

P 11.7 Developing a Landfill Liner to Retain Organic Wastes... 

Smith, J. A., and Jaffe, P. R. (1994). Benzene transport through landfill liners containing OTgsmophihc bentonite, Journal of Environmental Engineering, 120, 6, 1559-1577. 

The behaviour of landfill liners with respect to metal sorption has also been investigated by the novel technique of combined sequential extraction-sorption isotherm analysis (CSSA) (Salim et al, 1996). The study demonstrated that Pb and Ni would be effectively immobilised by the clayey calcareous sediment studied, but Cr would not. Roehl and Czurda (1998) applied a similar approach in their investigation of clay landfill liners and showed that speciation was dependent on heavy metal load, with weaker binding at higher concentrations of Cd and Pb. 

Salim, I.A., Miller, C.J. and Howard, J.L. (1996) Sorption isotherm-sequential extraction analysis of heavy metal retention in landfill liners. Soil Sci. Soc. Am.f., 60, 107-114. 

Excavation in order to remove drums and highly polluted waste. If the most contaminated waste in the landfill body can be identified, excavation may be an efficient remediation technique. Partly corroded drums may be difficult to handle without contaminating the waste material this is for precautions and care. The excavated material may be removed for off-site treatment or may be re-landfilled in landfill sections established with landfill liners, leachate drainage collection, and treatment systems. 

Tab. 9.11 Estimate of the increase in annual concentrations in the groundwater, after landfill liner failure. (From Baccini etal. 1992.)...

To be effective in either limiting liquid ingress or egress and thus help to ensure effective leachate management, landfill liners/covers should be impermeable (or demonstrate very low permeability), durable, and resistant to chemical attack and puncture. 

If it is desired to speed up decomposition in a landfill environment, leachate recirculation can be used. In such systems, instead of pumping out, treating, and discarding any liquid effluent which reaches the top of the landfill liner, the liquid which is pumped out is reintroduced... 

Luders, G. and Seeger, S. (1999), Geotextile Protective Layer systems for Geomembranes, Draft translation. Integrated Research Programme, Development of Advanced Landfill Liner System, Germany. 

Polymers have a number of applications in waste treatment and disposal. Waste disposal landfill liners are made from synthetic polymers, as are the fiber filters that remove particulate pollutants from flue gas in baghouses. Membranes used for... 

Organo-clays may also be used as adsorption (chemical) barriers in association with landfill liners, where they can increase the useM life of the associated liner by 5-10 years (Voudrias, 2002). 

Voudrias, E.A. (2002). The concept of a sorption chemical barrier for improving effectiveness of landfill liners. Waste Management and Research, 20 251-258. Wilson, M J. (1986). Mineral weathering processes in podzolic soils on granitic materials and their implications for surface water acidification. Journal of the Geological Society of London, 143 691-697. 

Zhou, P. (2003). Clay Landfill Liners Subject to Variable Interfacial Redox and pH conditions - Heavy Metal and Clay Interactions. Ph.D. Thesis, Louisiana State University. 

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