Lubna landfill

FIG. 21 Mineral filter layers used for peripheral and “finger” pipe drainages the Lubna landfillThe terrain surrounding the landfill has a low gradient. Therefore a number of control sinks (every25-50 m) along the peripheral drain along with two pumping stations have been designed toprotect the drainage system against silting up. The collected leachate flows to the water cleaningplant in the south-eastern corner of the landfill and finally to the surface streams.Additional drainage was designed on the slopes and along technological roads. The open waterreservoirs were designed for the rain water flow from the landfill slopes (Fig. 4).8.3 Mineral capping systemTaking into account the high slope inclination, the constructed degassing system and introductionof plants on the landfill surface, the former planned capping system with a geomembrane wasreplaced with clay mineral and compost layers. The capping system of the landfill surface wasconstructed successively with the increase, of the landfill height.The compacted clay sub-layers of the mineral capping have the thickness of 03 m. The minimaldegree of compaction was I s = 0.92. A few clay layers were created to protect embankment forwaste layer disposal (Fig. 22). The scheme of the mineral capping system on the landfill slopes ispresented in Fig. 23.18