Simulation and exploration of cavitation process during microalgae oil extracting with ultrasonic- assisted for hydrogen production

Microalgae is promising to be used as feedstock resources for hydrogen production due to its high oil and grease contents. This promotes the development of extraction technology of microalgae oil. In this study, based on the Rayleigh-Plesset equation, the effects of temperature, pressure, ultrasonic power and frequency on the bubble motion of ethanol ultrasound cavitation are investigated. Subsequently, the effects of different process parameters on the extraction rate are studied using Schizochytrium sp. as raw material by stirring or ultrasonic-assisted extraction. And the composition of algae extraction oil is analyzed. The results show that the amplitude of cavitation bubbles increases with the increase of ultrasonic power and decrease of ultrasonic frequency. The extraction rate of algae oil reaches 93.76 +/- 0.48% when the ultrasonic power is 150 W, the reaction time is 30 min, the temperature is 50 degrees C and the liquid-solid ratio is 10:1. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study investigates the effects of temperature, pressure, ultrasonic power and frequency on the bubble motion of ethanol ultrasound cavitation, and further studies the impacts of different process parameters on the extraction rate of algae oil, as well as analyzes the composition of extracted oil.