Gaseous emissions from sewage sludge combustion in a moving bed combustor

Waste Management
Luciane BatistellaHumberto J José

Abstract

Substantial increase in sewage sludge generation in recent years requires suitable destination for this residue. This study evaluated the gaseous emissions generated during combustion of an aerobic sewage sludge in a pilot scale moving bed reactor. To utilize the heat generated during combustion, the exhaust gas was applied to the raw sludge drying process. The gaseous emissions were analyzed both after the combustion and drying steps. The results of the sewage sludge characterization showed the energy potential of this residue (LHV equal to 14.5MJkg(-1), db) and low concentration of metals, polycyclic aromatic hydrocarbons (PAH), polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF). The concentration of CO, NOx, BTEX (benzene, toluene, ethylbenzene and xylenes) emitted from the sludge combustion process were lower than the legal limits. The overall sludge combustion and drying process showed low emissions of PCDD/PCDF (0.42ng I-TEQNm(-3)). BTEX and PAH emissions were not detected. Even with the high nitrogen concentration in the raw feed (5.88% db), the sludge combustion process presented NOx emissions below the legal limit, which results from the combination of appropriate feed rate (A/F ratio), e...Continue Reading

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Citations

Jun 25, 2016·Journal of Environmental Management·Nuo LiuSicong Tian
Oct 30, 2018·Environmental Technology·Alex BassoHumberto Jorge José
Jul 7, 2020·The Science of the Total Environment·Qing SunHong-Gang Ni
Oct 29, 2020·Environmental Science & Technology·Yuji FujitaniJohn G Watson

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