Having identified the economic optimum of the 2S system for
the different waste composition scenarios, it is possible to compare
these figures with the single stage alternatives based on bicarbonate
injection (with and without pre-dusting devices). As a term of
comparison, the total annual cost of the system was assumed, which
includes the annualised equipment cost, the reactant costs (purchase
of reactants and disposal of residues) and the other O&M
costs (energy requirements, replacement parts, maintenance).