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Biomass Conversion and Biorefinery

, Volume 8, Issue 3, pp 509–519 | Cite as

Ultrasonic pretreatment for low-temperature hydrothermal liquefaction of microalgae: enhancing the bio-oil yield and heating value

  • Mohammad Saber
  • Abooali Golzary
  • Hu Wu
  • Fumitake Takahashi
  • Kunio Yoshikawa
Original Article
  • 127 Downloads

Abstract

We investigated the effect of ultrasonic pretreatment on the bio-oil yield and heating value in the low-temperature hydrothermal liquefaction (HTL) of microalgae. HTL is one of the thermochemical processes for bio-oil production. However, the high pressure of the process is one of the main challenges for commercialization. On the other hand, a decrease in the HTL pressure, and consequently a decrease in the temperature, results in a decrease in the bio-oil yield. In this work, we investigated a new method to increase the bio-oil yield at low pressures and temperatures. The microalgae (Nannochloropsis sp.) were first pretreated by ultrasonic waves for 30, 60, and 90 s at 100 W. After then, the bio-oil was produced using HTL at 210, 230, and 250 °C. According to the results, using ultrasonic-assisted HTL increased the bio-oil yield up to the maximum of 28.9% (90-s sonication time at 250 °C). Moreover, applying ultrasonic pretreatment resulted in a decrease in oxygen content of the bio-oil and consequently an increase in its heating value. However, the average nitrogen content did not change dramatically by using ultrasonic-assisted hydrothermal liquefaction.

Keywords

Bio-oil Microalgae Hydrothermal liquefaction Sonication Energy efficiency 

Notes

Acknowledgments

We would like to show our gratitude to Professor Serizawa (Department of Chemical Science and Engineering, Tokyo Institute of Technology) for providing Sonicator equipment.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of Environmental Science and Technology, Interdisciplinary Graduate School of Science and EngineeringTokyo Institute of TechnologyYokohamaJapan
  2. 2.Department of Environmental Engineering, Graduate Faculty of EnvironmentUniversity of TehranTehranIran
  3. 3.Process Engineering Division, Engineering UnitToyo Engineering CorporationChibaJapan

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