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Sewage sludge as cheap alternative to microalgae as feedstock of catalytic hydrothermal liquefaction processes

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Jan 2019Publisher:Elsevier BVJournal:The Journal of Supercritical Fluids, volume 143, pages 251-258 (issn: 0896-8446,

Authors: Prestigiacomo, Claudia; Costa, Paula; Pinto, Filomena; Schiavo, Benedetto; Siragusa, Angelo; Scialdone, Onofrio; Galia, Alessandro;

doi: 10.1016/j.supflu.2018.08.019

Sewage sludge as cheap alternative to microalgae as feedstock of catalytic hydrothermal liquefaction processes

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Abstract

Abstract Production of biocrude through hydrothermal liquefaction (HTL) of sewage sludge (SS) and Chlorella vulgaris was investigated. NiMo/Al2O3 (KF 851), CoMo/Al2O3 (KF 1022) and activated carbon felt, tested as catalysts at 598 K for 30 min, did not change the biocrude yield but significantly improved its quality. Quantitative sulfur removal and lower oxygen content were found in biocrude when KF 851 and KF 1022 were used with C. vulgaris. The same catalysts decreased O/C and S/C ratio of the biocrude from SS. The highest HHV (38.19 MJ/kg) and H/C ratio (1.65) and the lowest O/C (0.11) of the biocrude from SS were obtained with the cheaper activated carbon felt. A new product phase, probably related to the presence of microplastics in the sludge, was found when SS were converted with catalysts. SS constitute a promising and costless alternative feedstock to microalgae for the HTL processes.

Related Organizations

University of Palermo
Italy
National Laboratory of Energy and Geology
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