Journal
WASTE MANAGEMENT
Volume 59, Issue -, Pages 371-378Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2016.10.053
Keywords
Supercritical water; Pyrolysis; Sewage sludge; Bio-oil; Bio-char
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Funding
- High Technology Support Project of Tianjin [13ZCZDSF00900]
- Tianjin Research Program of Application and Advanced Technology [15JCQNJC06600, 16JCZDJC39600]
- National Natural Science Foundation of China [51278334]
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Municipal sewage sludge (SS) from wastewater treatment plant containing high water content (>85 wt. %), lead to the difficulty of co-combustion with MSW or coal due to the high cost of drying. This study explores an alternative method by supercritical water (SCW) pyrolysis of sewage sludge (SS) in a high pressure reaction vessel. The effects of temperature and moisture content of SS on yield and composition of the products (bio-oil, bio char and non-condensable gas) were studied. A temperature of 385 degrees C and moisture content of 85 wt.% were found to be the optimum conditions for the maximum bio-oil production of 37.23 wt.%, with a higher heating value of 31.08 MJ/kg. In the optimum condition, the yields of aliphatic hydrocarbon and phenols were about 29.23 wt.% and 12.51 wt.%, respectively. The physical and chemical properties of bio-char were analyzed by using XRF and BET. Results of GC analyses of NCG showed that it has the maximum HHV of 13.39 MJ/m(3) at 445 degrees C and moisture content of 85 wt.%. The reaction path from SS to bio-oil through SCW pyrolysis was given. Moreover, carbon balance was calculated for the optimal condition, and finding out that 64.27 wt.% of the carbon content was transferred from SS to bio-oil. Finally, this work demonstrates that the SCW pyrolysis is a promising disposal method for SS. (C) 2016 Published by Elsevier Ltd.
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