Environmental Engineering Research

  • 제25권4호
  • /
  • Pages.470-478
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  • 2020
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  • 1226-1025(pISSN)
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  • 2005-968X(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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Characteristics of direct transesterification using ultrasound on oil extracted from spent coffee grounds

  • Kim, Yeong Su (Department of Bio-industrial Machinery Engineering, Kyungpook National University) ;
  • Woo, Duk Gam (Research Faculty of Agriculture, Hokkaido University) ;
  • Kim, Tae Han (Department of Bio-industrial Machinery Engineering, Kyungpook National University)
  • 투고 : 2019.02.27
  • 심사 : 2019.07.01
  • 발행 : 2020.08.31
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초록

Spent coffee grounds (SCG), the residue after brewing coffee beverage, is a promising biodiesel feedstock due to its high oil contents (15-20%). However, SCG should be pretreated to reduce the high free fatty acid content, which hampers transesterification reaction. To overcome this, we explored a direct transesterification reaction of SCG using ultrasound irradiation and identified the optimal sonication parameters. A high fatty acid methyl ester (FAME) content, up to 97.2%, could be achieved with ultrasound amplitude of 99.2 ㎛, irradiation time of 10 min, and methanol to oil ratio of 7:1 in the presence of potassium hydroxide concentration of 1.25 wt.%. In addition, we demonstrated that ultrasound irradiation is an efficient method to produce biodiesel from untreated SCG in a short time with less energy than the conventional mechanical stirring method. The physical and chemical properties of the SCG biodiesel met the requirements for an alternative fuel to the current commercial biodiesel.

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피인용 문헌

  1. Solid Fuel Characteristics of Pellets Comprising Spent Coffee Grounds and Wood Powder vol.14, pp.2, 2020, https://doi.org/10.3390/en14020371