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

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

Research output: Contribution to journalArticlepeer-review

20 Citations (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.
Original languageEnglish
Pages (from-to)251-258
Number of pages8
JournalTHE JOURNAL OF SUPERCRITICAL FLUIDS
Volume143
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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