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Libroplantasingl

72-73 Sizing shared solid urban waste and light weight packaging treatment lines In order to plan/design efficient plants in geographical areas where the supply is less than 3,000 t/year, the alternative to manual facilities is automation of the sorting process for shared use of remainder fraction treatment and material obtained from selective collection. This provides the lines with sufficient nominal capacity to process the fraction from selective collection in the fewest possible processing hours, dedicating the remaining annual hours to treating the remained fraction. The increased nominal capacity means improved efficiency, which is increased even more by the increased performance compared to that obtained in manual sorting plants. In addition, a greater design capacity is an advantage for adapting the process work plan to seasonal changes in input. It should be noted that sharing the processing line also allows sharing of the fixed costs by the two processes. In light weight packaging sorting lines these costs represent 32-35% of the unit sorting cost. In this way the cost of amortisation and financing, insurance and management and administration personnel can be allocated according to the dedication of the line to each process. For shared line plants the nominal capacity is designed according to the solid urban waste fraction input. The nominal capacity must be such that it allows processing in a single work shift all solid urban waste input at the end of the facility’s service life. The design capacity must allow processing in a single work shift the seasonal input peaks in the last year of the facility’s service life. In addition, to ensure that all waste is treated at all times the design capacity must be oversized by 10%. The design capacity of the facility can be calculated as: Design capacity = 1.1*(mean monthly input and end of lifetime (t/month) * Input increase in one month (%) / (1 shifts * 144 h/month)). The equipment needed to reach this capacity will depend on the nominal line capacity when processing the light weight packaging fraction, and must fulfil the condition that the light weight packaging fraction is processed in a single work shift in the last year of the facility’s service life. This allows the use of the third shift for maintenance operations. LIGHT WEIGHT PACKAGING SORTING PLANTS


Libroplantasingl
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