抄録
Combustion of municipal sewage sludge was conducted in pilot plant incinerator for estimating heavy metal behavior in exhaust gas by using deposited particle on each chamber as indicator. Slag index, vaporization index, deposition index and fly ash index were identified to be indicator. The result indicated that most of volatile groups could volatile from sludge and As, Pb, Cu, Cd could remain in flue gas. The main deposited particle elements were Zn, P, S, Na, Fe, Al, Si, Ca. and the difference of them in each chamber was observed In secondary chamber, the main deposited particle was Fe but in other parts, the main deposited particle was Zn. At water cooling part, the maximum deposited particle composition is volatile group. From XRD analysis, the main chemical compounds were Zn3(PO4)2, AlPO4, FePO4 and Fe(OH)3. In addition, deposited particle sizes compared with fly ash particles were about 50 times larger size.
