MSW collection and transportation, spreading and compaction
at the landfill site consumed a considerable amount of diesel fuel at
a rate of 9.7 L and 3.7 L respectively per tonne of waste management.
Gross energy consumption from the project was estimated mainly with regard to those activities and this amounted to 11.63 kg
of crude oil-eq/tonne of waste. The LFG-to-energy project in BMA
consumed part of the electricity generated for on-site activities, but
this is not accounted for in the analysis as it is considered as part of
renewable energy. As a result of selling a part of the generated
electricity to the grid (28.2 kWh/tonne), fossil-fuel utilisation for an
equivalent amount of conventional electricity production could be
avoided. Thus, electricity sold to the grid has been credited with
avoiding an equivalent amount of conventional electricity production
(5.95 kg of crude oil-eq/tonne). Taking into account all the
aspects, the estimated net resource consumption from this project
is 5.68 kg of crude oil-eq/tonne of waste management, see Fig. 5. A
comparison of these results with BAU practice shows that an LFG to
energy recovery project can lead to a 51% energy saving, see Fig. 5.
According to the results of the analysis, it was noted that the LFGto-
energy recovery project has a significant influence on the
abiotic fossil resource savings.