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Biodiesel microemulsion upgrading and thermogravimetric study of bio-oil produced by liquefaction of different sludges
- 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.
- Subjects :
- Biodiesel
Materials science
020209 energy
Mechanical Engineering
Liquefaction
02 engineering and technology
Building and Construction
010501 environmental sciences
Pulp and paper industry
01 natural sciences
Pollution
Industrial and Manufacturing Engineering
Supercritical fluid
chemistry.chemical_compound
Diesel fuel
General Energy
chemistry
Biofuel
0202 electrical engineering, electronic engineering, information engineering
Microemulsion
Methanol
Electrical and Electronic Engineering
Sludge
0105 earth and related environmental sciences
Civil and Structural Engineering
Subjects
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