NDLI: Semi-pilot scale sewage sludge pyrolysis and characterization of obtained fractions by thermal analysis

Content Provider	Springer Nature Link
Author	Viana, Marcelo Mendes Rangel, Brites Fontoura Júnior, Alex Neves Melchert, Maura Berger Maltez Dweck, Jo
Copyright Year	2015
Abstract	Sewage sludge pyrolysis is an alternative to incineration and presents as advantages the generation of three fractions: gas (non-condensable volatiles), liquid (condensable volatiles) and solid (carbonaceous coke). In this context, the purpose of the present study is to quantify and to characterize by thermal analysis the fractions produced by sewage sludge pyrolysis in semi-pilot scale. The semi-pilot pyrolysis was performed in two steps, the first dynamic up to 500 °C, followed by an isothermal step at this temperature for 3 h. The solid and liquid fractions produced were analyzed by TG/DTG/DTA, and the volatiles were analyzed by thermogravimetry coupled to mass spectrometry (TG-MS). The influence of different pyrolysis conditions (dynamic and isothermal) was verified by differential thermal analysis (DTA) characterization and by the higher heating value (HHV) of the liquid fractions produced by sludge pyrolysis. In total, 60.1, 28.6 and 11.3 % of the sludge initial mass were obtained, respectively, as solid, liquid and gas pyrolytic fractions. The liquid fraction was composed of aqueous and oily phases. By TG-MS, the volatile compounds detected in pyrolysis were as follows: H$_{2}$O, C$_{3}$H$_{6}$, CO$_{2}$, NO$_{2}$, C$_{4}$H$_{8}$, SO$_{2}$, C$_{6}$H$_{6}$ and C$_{7}$H$_{8}$. The aliquots obtained at higher time periods by isothermal pyrolysis at 500 °C showed higher DTA exothermic peaks and higher HHV values as well. Sewage sludge isothermal pyrolysis at 500 °C produces a liquid fraction with HHV of 36.2 MJ kg$^{−1}$, indicating that it can be used as renewable energy source. A good correlation exists between total DTA peak area of the oily fractions obtained from sewage sludge pyrolysis and respective HHV values, indicating that it can be used to estimate these values from corresponding DTA curves.
Starting Page	981
Ending Page	991
Page Count	11
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	123
Issue Number	2
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-06-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sewage sludge Pyrolysis Oil DTA TG-MS Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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