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L1644_C08.fm  Page 308  Tuesday, October 21, 2003  3:03 PM









                             8.2.2.3  Inventory Analysis
                             The considered landfill is situated in Spain. To carry out the inventory analysis, real
                             and bibliographic Spanish data have been considered. For the collection data, the
                             following main steps have been taken into account: use and maintenance of waste
                             containers, collection and transport of  wastes from the point of generation to the
                             landfill, and management of the wastes in the landfill with partial (50%) collection
                             and flaring of the generated biogas and with partial (80%) collection and biological
                             treatment of the produced leachate.
                                The following section and Table 8.1 through Table 8.4 summarize the main input
                             data introduced into the software for characterizing, from an environmental point
                             of view, all the elements directly and indirectly implicated in the landfilling activity
                             (containers, vehicles, landfill and MHSW).

                             Containers:
                                                  3
                             General — capacity: 1.1 m ; lifetime: 6 years; and container load rate: 75%
                             Composition — HDPE: 59 kg; steel: 4 kg; rubber: 1.5 kg; and aluminum: 0.5 kg
                             Cleaning — frequency: 1 per week; water: 30 l; and cleaning product: 0.07 kg

                             Collection and transport vehicles:
                                                3
                             General — load: 21.5 m ; compacting ratio: 6.5%; lifetime: 185,000 km; collection:
                                daily
                             Vehicle body composition — steel: 13 t; PP: 500 kg; aluminum: 250 kg; glass: 50 kg
                             Cleaning — frequency: 15 times/1000 km; water: 300 l; cleaning product: 5 kg
                             Diesel consumption — collection: 116 l/100 km; transport: 50 l/100 km
                             Average distances — collection: 9 km; transport: 18 km
                             Oil consumption — motor oil: 108 l/10,000 km; hydraulic oil: 165 l/10,000 km

                             Landfill:
                             General — tonnage stored: 4167 t/month; total storage capacity: 2,000,000 m 3
                             Construction — clay: 19,000 t; sand and gravel: 12,000 t; HDPE: 150 t; diesel:
                                30,000 l




                              TABLE 8.1
                              Characterization and Composition of MHSW

                                                                  3
                                            Weight (%)  Density (kg/m )  Moisture (%)  Biogas (kg/kg)
                              Organics        37.62       600            77.50          0.63
                              Paper/cardboard  21.01      183            22.32          0.29
                              Glass            8.21       300             1.84          0
                              Plastics        15.81        20            22.50          0
                              Metals           5.31        83             7.70          0
                              Others          12.04        94            20.93          0.18



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