Microwave pyrolysis of distillers dried grain with solubles (DDGS) for biofuel production

Hanwu Lei, Shoujie Ren, Lu Wang, Quan Bu, James Julson, John Holladay, Roger Ruan

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73 Scopus citations


Microwave pyrolysis of distillers dried grain with solubles (DDGS) was investigated to determine the effects of pyrolytic conditions on the yields of bio-oil, syngas, and biochar. Pyrolysis process variables included reaction temperature, time, and power input. Microwave pyrolysis of DDGS was analyzed using response surface methodology to find out the effect of process variables on the biofuel (bio-oil and syngas) conversion yield and establish prediction models. Bio-oil recovery was in the range of 26.5-50.3. wt.% of the biomass. Biochar yields were 23.5-62.2% depending on the pyrolysis conditions. The energy content of DDGS bio-oils was 28. MJ/kg obtained at the 650 °C and 8. min, which was about 66.7% of the heating value of gasoline. GC/MS analysis indicated that the biooil contained a series of important and useful chemical compounds: aliphatic and aromatic hydrocarbons. At least 13% of DDGS bio-oil was the same hydrocarbon compounds found in regular unleaded gasoline.

Original languageEnglish (US)
Pages (from-to)6208-6213
Number of pages6
JournalBioresource Technology
Issue number10
StatePublished - May 2011

Bibliographical note

Funding Information:
This work was supported in part by grants from the South Dakota Corn Utilization Council , and US USDA/Sun Grant Initiative . The authors also wish to thank Dr. Linhong Jing from SDSU Core Campus Mass Spectrometry Facility.


  • DDGS
  • GC/MS
  • Hydrocarbon
  • Microwave pyrolysis


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