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• There is neither an analysis nor a total characterization of the municipal
waste entering the system.
• The environmental loads associated with the emissions of the final waste
disposal in a landfill has not been considered.
• It was not possible to simulate the following products used in the incin-
eration process because of an information lack in the databases consulted:
ferric chloride, active carbon and additives used in the osmosis process.

2.7.4 RESULTS OF THE INVENTORY ANALYSIS
The results for the life-cycle inventory analysis are shown in Table 2.7 and are as
follows:

Raw material consumption The current situation is unfavorable for all of the 14
analyzed parameters that are considered according to Frischnkecht et al. (1996) due
to the higher consumption of raw materials (especially cement, for the higher waste
quantity per produced TJ, and CaO, for the advanced gas treatment) and more
transport activity because of the higher raw material consumption and waste quantity.

Energy consumption The current situation is unfavorable due to the higher energetic
consumption per produced TJ because of the additional energy consumption of the
advanced gas treatment system.

Air emissions From the 37 analyzed parameters, the current situation is unfavorable
for all except 9: As, Cd, PCDD/Fs dust, HCl, HF, Ni, SO and other heavy metals.
2
These are basically the parameters reduced by the operation of the advanced gas
treatment system.

Water emissions From the 23 analyzed parameters, the current situation is unfavor-
able for all except 4: BOD, COD, Cd and Hg. These are basically the parameters
reduced by the current operation that works without water emissions into the sewage.

2.7.5 COMPARISON WITH SPANISH ELECTRICITY MIX
The electricity produced by MSWI, SIRUSA is fed into the Spanish electricity net.
One ton of waste produces about 1 MJ electric energy in the current situation with
advanced flue gas treatment. This can be seen as an energy benefit because SIRUSA
replaces the electricity production of a conventional electrical power plant. On one
hand, this saves resources; on the otherhand, some of the emissions are reduced in
comparison to the Spanish electricity mix.

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