Abstract
This paper presents a study of pollutant emissions during combustion tests of sewage sludge in a pilot fluidized-bed system. Mono-combustion of sludge and its co-combustion with coal were compared with combustion of coal alone. It was verified that the high N content in the sludge did not lead to an increase in NOx production and that air staging gave rise to very low levels of NO emissions. SO2 diminished when the sludge was introduced, but achieving acceptable levels to meet emission limits still required the use of limestone. The emissions of heavy metals were increased during co-combustion but decreased during sludge mono-combustion, with the exception of Hg, which was retained more efficiently in cyclone ashes during co-combustion. The study of the dependence of the Pb and Cd distributions on the diameter of the fly ash emitted showed that these metals were associated with particles with an average diameter of 2−3 μm and that their removal would only be possible with adequate gas cleaning.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
