waste contributes 66% of total recycling potential value under the
worst-case scenario while accounting for 5% of the total weight of
demolition waste. Nevertheless, the potential of recycling more
metal waste materials is limited as it is already highly recycled. All
three scenarios indicate that the recycling potential of concrete and
brick waste is very high. Therefore, focus should be placed on
improving the recycling approaches and recycling rates of concrete
and brick waste so that the recycling revenue can be further
enhanced.
3.3. Landfill demands and planning
Table 8 shows the landfill demands of demolition waste under
different scenarios. Demands for landfill space varied significantly
across the scenarios. In the worst-case scenario, where all thewaste
(except metal) is sent to landfill, 54.4 millionm3 area spaces will be
needed. If the depth of landfill is assumed to be 25 m and the value
for every m2 land is assumed to be $ 0.1million, it would worth $
217.6 billion. The second scenario tries to reproduce the existing
waste disposal regime of the city (realistic scenario). This includes
progressively enhancing the recycling rate, thereby reducing the