Combustion in fluidised bed boilers is one of the most commonly used methods treatment municipal sewage sludge. Fly ash (FA) and air pollution control (APC) residues are solid by-products generated by flue gas treatment. There significant differences chemical composition these wastes. FA composed mainly SiO2, P2O5, CaO metals such as Zn, Ti, Cu, Cr, Pb Ni. APC contain SO3 Na2O. The leachability...
