Compaction Properties of Municipal Solid Waste

摘要

Waste compaction decrease insitu waste void, improve landfill stability and extend landfill life. Recently buried waste was excavated from two large pits in Johannesburg Robinson Deep Landfill site. The compaction characteristics such as optimum moisture content (w_(omc)), compaction effort (Ce) and maximum dry density (γ_(mdd)) of the bulk and reconstituted waste mass were investigated in the laboratory. Compaction effort ranging from 5 layers and 35 blows per layer to 5 layers and 175 blow per layer of as received and reconstituted samples was investigated. The result of series of modified proctor effort revealed that the density of waste mass is dependent on the relative constitution of organics and plastics. Waste mass constituted of 50% of organics, the maximum. Maximum density of waste mass decreased with percentage of plastic and waste mass constituted of 20% plastics was not compactible. The maximum dry unit weight of as received waste was dependent on the pre-compaction moisture content. The maximum dry unit weight of initially soaked was greater than that of the initially dried waste mass. The reproducibility of specific gravity of the compacted waste mass was dependent on specimen mass and test results which were determined by the use of waste specimens that were are less than 200 g was not reproducible. The relationship between density and compaction effort (KN.m/m~3) was nonlinear with R~2 = 0.9196, for the range of 35 blow/layer [44 KN.m/m~3] and 175 blows/layer [222.04 KN.m/m~3], and can provide good estimate of field parameters of compaction plant in relation to number of passes.