Supercritical water gasification of sewage sludge by continuous flow tubular reactor: A pilot scale study

Adar E., Ince M., BİLGİLİ M. S.

CHEMICAL ENGINEERING JOURNAL, cilt.391, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 391
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.cej.2019.123499
  • Dergi Adı: CHEMICAL ENGINEERING JOURNAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Aqualine, BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chimica, Compendex, Food Science & Technology Abstracts, INSPEC, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Anahtar Kelimeler: Supercritical gasification, Hydrogen, Renewable energy, Catalyst, Pilot scale reactor, HYDROTHERMAL GASIFICATION, HYDROGEN-PRODUCTION, BIOMASS GASIFICATION, WASTE-WATER, MODEL-COMPOUND, PART 1, LIQUEFACTION, ENERGY, HYDROLYSIS, CELLULOSE
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Treatment and disposal of sewage sludge constitute one of the major problems of wastewater treatment plants due to high water content and more stringent environmental regulations. Supercritical water gasification (SCWG) technology is accepted as a promising method for sustainable sludge disposal because of the elimination of need for costly water reduction and drying processes before disposal by conventional methods. The aim of this study is to determine the effect of temperature (450-650 degrees C), solid matter content (1-2%) and catalyst addition (0.5-2% KOH) on supercritical gasification of sewage sludge in a continuous-flow pilot scale tubular reactor. The results indicate that the gasification efficiency is generally temperature dependent. Furthermore, catalyst addition improves the gasification efficiency at high solids content. The produced gas contains 60% of H-2 and 22% of CH4 at experimentally determined optimal conditions (650 degrees C, 2% solid matter content, 2% KOH). The resulting gas contains H2S and CO below detection limits and there is no need for additional treatment.