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国际清洁环境能源期刊
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN 打印: 2150-3621
ISSN 在线: 2150-363X

国际清洁环境能源期刊

Formerly known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v7.i3.60
pages 269-284

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
Isabel Cabrita
LNEG, Estrada do Paco 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 NOx, 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.