Optimization of microalgae oil extraction under ultrasound and microwave irradiation

Background. Microalgae are one of the most promising biofuel sources that the world has to offer, although the conversion process is hampered by technical and economic problems mainly related to de-watering and extraction. The efficiency of the process can be dramatically improved by means of non-conventional techniques such as ultrasound (US) and microwaves (MW). However, their energy efficiency must also be taken into account. Results. In the present work different solvents (chloroform/methanol mixtures, hexane, acetone and pure methanol) and procedures (Bligh-Dyer and Folch as conventional, MW and US as non-conventional) were tested to find the best conditions for lipid extraction from Nannochloropsis gaditana microalga. The energy consumption of USand MW-assisted microalgae oil extraction processes have been compared with classical procedures.

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