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

被引:82
作者
Adar, Elanur [1 ]
Ince, Mahir [2 ]
Bilgili, Mehmet Sinan [3 ]
机构
[1] Artvin Coruh Univ, Fac Engn, Dept Environm Engn, Seyitler Campus, TR-08100 Artvin, Turkey
[2] Gebze Tech Univ, Fac Engn, Dept Environm Engn, TR-41400 Kocaeli, Turkey
[3] Yildiz Tech Univ, Fac Civil Engn, Dept Environm Engn, TR-34220 Istanbul, Turkey
关键词
Supercritical gasification; Hydrogen; Renewable energy; Catalyst; Pilot scale reactor; HYDROTHERMAL GASIFICATION; HYDROGEN-PRODUCTION; BIOMASS GASIFICATION; WASTE-WATER; MODEL-COMPOUND; PART; LIQUEFACTION; ENERGY; HYDROLYSIS; CELLULOSE;
D O I
10.1016/j.cej.2019.123499
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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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页数:10
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