Hazardous waste landfill material considerations

This section discusses several material and design considerations for FMLs. It highlights some of the problems encountered in designing bathtub systems for hazardous waste landfills and describes the impact of regulations on material and design considerations. 

The permeation rate for the difihision of a pollutant through the composite liner is thus determined according to Eqs. 7.35 and 7.36 at specified thicknesses (for example. di = 2.5 mm and J2 = 0.75 m and/or 1.50 m for municipal waste landfill and/or the hazardous waste landfill) by diffusion coefficients Di and Do, partition coefficient cTo,i and as well as by the parameters of the porous mineral material 0 and 77 While the parameters Di and Do as well as 0 and /"vary only by one or two orders of magnitude for different pollutants and mineral materials, the partition coefficients partition coefficient between plastic geomembrane and leachate which characterises the permeation rate of the composite liner for different pollutant classes. The partition coefficient for cations and anions is in practice zero, since they cannot be dissolved in the non-polar medium polyethylene. For the diffusive mass transport therefore only undissociated organic and inorganic molecules have to be taken into consideration. 

---