Sewage sludge torrefaction in a fluidized bed reactor

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[1] Atienza-Martínez, M.
[2] 1,Fonts, I.
[3] ábrego, J.
[4] Ceamanos, J.
[5] Gea, G.
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Atienza-Martínez, M. (atienza@unizar.es) | 1600年 / Elsevier B.V., Netherlands卷 / 222期
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Torrefaction of sewage sludge in a lab-scale fluidized bed reactor was studied in order to know if this pre-treatment could enhance the properties of this waste in subsequent thermochemical processing; such as pyrolysis. The influence was studied of two important torrefaction operational parameters; temperature (220-320°C) and solid residence time (3.6-10.2min); on the product distribution and properties. Taking into account the operation conditions evaluated in this work; torrefaction temperature affects solid product properties at long solid residence times (longer than 6.1min) and that the effect of solid residence time is only significant at the highest temperature (320°C). Severe torrefaction conditions result in the release of bonded water which could enhance some properties of the liquid obtained in the ensuing pyrolysis process. However; the torrefaction pre-treatment also implies that part of the extractives is lost from the raw material. Compared to dry raw sewage sludge; the energy density of sewage sludge after torrefaction increases under certain conditions. The removal of H2O and CO2 during the torrefaction step reduces the O/C ratio in the torrefied solid up to 0.12 (66.70% reduction compared to 0.37 in raw sewage sludge) which could be a benefit for subsequent thermochemical treatments. For example; one of the main drawbacks of pyrolysis liquids is their high oxygen content. © 2013 Elsevier B.V;
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