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Biodiesel microemulsion upgrading and thermogravimetric study of bio-oil produced by liquefaction of different sludges

Authors :
Lijian Leng
Wenguang Zhou
Pei Han
Jun Li
Xingzhong Yuan
Source :
Energy. 153:1061-1072
Publication Year :
2018
Publisher :
Elsevier BV, 2018.

Abstract

Different sludges such as municipal sewage sludge, paper/pulp mill sludge, and slaughterhouse sludge were collected and characterized for energy production. Bio-oils were produced from these sludges by supercritical liquefaction at 300 °C with methanol as the solvent. Carbon-rich and viscous bio-oils with yields about 20–30% were obtained. With methyl esters as the dominant component, these bio-oils were upgraded by blending or microemulsifying with biodiesel (fatty acid methyl esters). The optimum microemulsions were formed at biodiesel/bio-oil ratio of 10, with bio-oil content of more than 8% (which doubled that obtained by blending) and surfactant effectiveness of 0.5–0.6 g rhamnolipid/g bio-oil being obtained. The thermogravimetric studies show that the blending and microemulsifying processes led to the shift of decomposition range and rate to higher levels and the reduction of activation energy of the hybrid fuel systems. There may be synergies of enhancing the combustion or ignition of microemulsions when biodiesel and bio-oil were used in combination in diesel engines, overcoming the disadvantages of using either biodiesel (e.g., long ignition delay, etc.) or bio-oil (e.g., long ignition delay and viscosity, etc.) individually. Microemulsification may be a promising bio-oil upgrading technology.

Details

ISSN :
03605442
Volume :
153
Database :
OpenAIRE
Journal :
Energy
Accession number :
edsair.doi...........61c276b104f79e0471ce1c65793db44e
Full Text :
https://doi.org/10.1016/j.energy.2018.04.087