volume of the waste disposed of in landfills by 30%. The last scenario
describes an optimum system that includes higher rates of
waste recovery. Compared to the worst-case scenario, the optimum
scenario would reduce the amount of waste to be disposed in
landfills by 80%. These scenarios were obtained by running the submodel
for waste management and land demand evaluation of the
proposed model.
Based on current technologies used in the study area, about
0.45 m3 of landfill space is needed for each type of waste disposed
per ton. A standard depth of landfill used to calculate land demand
for waste disposal varies between 20 and 50 m. Considering the
characteristics of most of available areas for landfill, as well as the
capability of some existing landfills in the study area (e.g.10 million
m3 at the Tong Long Hill landfill), a volume of 10 million m3 for
landfills was adopted. Moreover, it is except that a new landfill
located around Nan Shan District will be built around 2016.
Fig. 7 presents the amount ofwaste to be sent to landfills and the
demand for land to dispose of thiswaste corresponding to the three
scenarios of waste management between 2015 and 2060. There is a
massive gap between the worst-case scenario and the optimum
scenario. When all the demolition waste generated in the city is
disposed of in landfills (worst-case scenario), the demand for land
for landfills is more than 5. Starting from the year 2033, the construction
of new landfills will be required every 6 years under the
worst scenario. The realistic waste disposal scenario has a lower
demand for land for waste disposal than the previous simulation.
However, the amount of demand for landfill is still around 4. Only
under the optimum scenario will the new landfill expected to open
in 2016 be sufficient to satisfy the demand. These results show that
the improvement of demolition waste recycling rate can significantly
reduce the landfill demands and postpone the need for new
landfills.
volume of the waste disposed of in landfills by 30%. The last scenariodescribes an optimum system that includes higher rates ofwaste recovery. Compared to the worst-case scenario, the optimumscenario would reduce the amount of waste to be disposed inlandfills by 80%. These scenarios were obtained by running the submodelfor waste management and land demand evaluation of theproposed model.Based on current technologies used in the study area, about0.45 m3 of landfill space is needed for each type of waste disposedper ton. A standard depth of landfill used to calculate land demandfor waste disposal varies between 20 and 50 m. Considering thecharacteristics of most of available areas for landfill, as well as thecapability of some existing landfills in the study area (e.g.10 millionm3 at the Tong Long Hill landfill), a volume of 10 million m3 forlandfills was adopted. Moreover, it is except that a new landfilllocated around Nan Shan District will be built around 2016.Fig. 7 presents the amount ofwaste to be sent to landfills and thedemand for land to dispose of thiswaste corresponding to the threescenarios of waste management between 2015 and 2060. There is amassive gap between the worst-case scenario and the optimumscenario. When all the demolition waste generated in the city isdisposed of in landfills (worst-case scenario), the demand for landfor landfills is more than 5. Starting from the year 2033, the constructionof new landfills will be required every 6 years under theworst scenario. The realistic waste disposal scenario has a lowerdemand for land for waste disposal than the previous simulation.However, the amount of demand for landfill is still around 4. Onlyunder the optimum scenario will the new landfill expected to openin 2016 be sufficient to satisfy the demand. These results show thatthe improvement of demolition waste recycling rate can significantlyreduce the landfill demands and postpone the need for newlandfills.
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