Behavior of Metal Compounds Deposit in Wet Sewage Sludge Combustion

Premrudee Kanchanapiya; Takeo Sakano; Chikao Kanaoka; Tokuyoshi Mikuni; Yoshihiko Ninomiya; Lian Zhang; Megumi Masui

doi:10.11491/apcche.2004.0.387.0

Asian Pacific Confederation of Chemical Engineers congress program and abstracts

Session ID : 1K-10

DOI https://doi.org/10.11491/apcche.2004.0.387.0

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Host: The Society of Chemical Engineers, Japan

Behavior of Metal Compounds Deposit in Wet Sewage Sludge Combustion

Premrudee Kanchanapiya, Takeo Sakano, Chikao Kanaoka, Tokuyoshi Mikuni, Yoshihiko Ninomiya, Lian Zhang, Megumi Masui

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Keywords: heavy metal, sewage sludge, melting process, deposited particle

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Abstract

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.

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