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Clean Air: International Journal on Energy for a Clean Environment

ISSN for PRINT: 1561-4417

Institutional price:	$451.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2006, Volume7

123 pages

DOI: 10.1615/InterJEnerCleanEnv.v7.i3

Issue price - $128.00

ENVIRONMENTAL EVALUATION OF SEWAGE SLUDGE CO-COMBUSTION IN A PILOT FLUIDIZED BED COMBUSTOR

M. Helena Lopes
INETI/DEECA, Estrada Paço do Lumiar 22, 1649-038 Lisboa, Portugal

P. Abelha
DEECA-INETI, Edificio J, Estrada do Paco do Lumiar 22, 1649-038 Lisboa, Portugal

I. Cabrita
INETI/DEECA, Estrada Paço do Lumiar 22, 1649-038 Lisboa, Portugal

J. F. Santos Oliveira
UNL/FCT-Ubia, 2825 Caparica, Portugal

I. Gulyurtlu
DEECA-INETI, Edificio J, Estrada do Paco do Lumiar 22, 1649-038 Lisboa, Portugal

ABSTRACT

Co-combustion of coal with sludge did not result in greater NO_x, SO₂, HCl, and CO emissions. Sludge raised heavy metals emitted, especially Cd, Pb, and Hg, mostly associated with particles greater than 1 μm. Metals were retained in bed ashes and in the cyclones and most of the Hg was adsorbed in fly ashes. The leachability of metals and organic matter decreased with combustion. Results of acid neutralization capacity showed that ashes became more resistant to acidification than the parent sludge. Globally, this study shows that combustion of sludge can reduce environmental impact compared with the traditional direct use of sludge in soils.