Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 138, Issue -, Pages 115-123Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2018.04.011
Keywords
Wet sewage sludge; Mixed solvents; Liquefaction; Bio-oil; Solid residue
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Funding
- National Natural Science Foundation of China [51576135]
- Aeronautical Science Foundation of China [2015ZB54006]
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The effect of different mixed solvents (methanol-water (MeOH-H2O), n-hexane-water (HEX-H2O)) on liquefaction of municipal wet sewage sludge (WSS) was investigated in this study. The highest bio-oil yield of 46.5 wt % was achieved in MeOH-H2O, of which ester content was 38.1% and methyl ester comprised 37.4%. The lowest solid residue yield of 10.3 wt% was achieved in HEX-H2O. The highest fatty acid compounds content was 54.9% of bio-oil obtained in HEX-H2O, of which were in saturated state. The highest calorific value and the lowest oxygen content of bio-oil were achieved in HEX-H2O: 36.45 +/- 0.38 MJ/kg and 7.65 0.26 wt%, respectively. The thermal stability of solid residue was enhanced in HEX-H2O. The formation of esters was promoted in MeOH-H2O, whereas aliphatic compounds could be efficiently extracted in HEX-H2O.
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