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

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

Risultato della ricerca: Article

9 Citazioni (Scopus)

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.
Lingua originaleEnglish
pagine (da-a)251-258
Numero di pagine8
RivistaTHE JOURNAL OF SUPERCRITICAL FLUIDS
Volume143
Stato di pubblicazionePublished - 2019

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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