Patent ID: 9101968
Filing Date: 2015-08-11
Classification: B09B,E02B,Y02W

Abstract:
1. A method for covering landfills, the method comprising: preparing a flat or sloping surface of landfill waste; depositing and compacting a clay layer over the surface of the landfill waste at an optimum water content of the clay; depositing and compacting a gravelly sand layer above the clay surface; depositing and compacting a silt layer above the gravelly sand surface, the depositing of the layers comprises introducing an additional layer of compacted clay as a compacted bottom clay layer beneath a capillary barrier system, the capillary barrier system made of the silt layer overlying the compacted gravelly sand layer, whereby saturated water permeability of the silt layer, the gravelly sand layer and the compacted bottom clay layer increases first and then decreases from the top to the bottom layers, with the day layer compacted beneath the a capillary barrier system, which reduces water infiltration at dry conditions, and the compacted bottom clay layer reducing water infiltration at wet and saturated conditions and reducing landfill gas emission, using, as the deposited layers, all soils made of naturally occurring materials.