Journal
CHEMICAL ENGINEERING JOURNAL
Volume 391, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123499
Keywords
Supercritical gasification; Hydrogen; Renewable energy; Catalyst; Pilot scale reactor
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Funding
- Scientific Research Projects Coordinator-ship of Yildiz Technical University (BAP) Istanbul Turkey [2016-05-02-KAP01, 2016-05-02-DOP01]
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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. Consequently, SCWG technology provides complete decomposition of organic matter in a short time, clean gas formation with higher energy content, and volumetric reduction compared to conventional methods.
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