Effect of Devices and Driving Pressures on Energy Requirements and Mass Transfer Coefficient on Microalgae Lipid Extraction Assisted by Hydrodynamic Cavitation

Abstract

Previous studies of biodiesel production from microalgae have concluded that microalgal biodiesel is not profitable at an industrial scale due to its excessive energy consumption for lipid extraction. Hydrodynamic cavitation lipid extraction is one of the extraction methods which has lower energy consumption. Thismethod enables a fast extraction rate and low energy consumption for cell disruption. In order to achieve optimum process conditions, several influential parameters, which are cavitation generator geometry and driving pressure, need to be scrutinized. The experimental result showed that the maximum yield was obtained at 5 bar driving pressure. The lowest specific extraction energy was obtained at 4.167 bar driving pressure while using one side concave cavitation generator geometry with the ratio of the reduced cross-sectional area of 0.39. The value of the energy extraction requirement 17.79 kJoule/g lipids is less than the biodiesel heating value, and the value of the volumetric mass transfer coefficient is almost 20 times fold greater than the conventional extraction method, therefore this method is promising to be further developed.

Journal of Water and Land Development

“…One of methods for intensification of lipid extraction from microalgae is hydrodynamic cavitation. SETYAWAN et al [2018] for their researches used biomass Nannochloropsis sp. In the result of their studies it was established optimum conditions for running process: energy supplied 91.3 kJ•kg -1 , temperature 42°C, cavitation index 0.126 and algae concentration 0.105 g•g -1 .…”

Characterisasion and Rate Determination of Lipid Extraction From Nannochloropsis Using Stirring Method

“…The microalgae used in this study is Nannochloropsis sp. Because it is rich in lipids, it has the potential to be used as a raw material for biodiesel production [21], [22]. As much as 42.315% of fatty acids in Nannochloropsis are palmitoleic acid.…”

Double step method in lipid extraction from biomass <i>Aurantiochytrium sp</i> powder

“…Biocomponents such as DHA and squalene are components contained in lipids found in Aurantiochytrium sp. The biocomponents (lipids) extraction from microalgae is challenging because microalgae have strong cell walls [8]. There are some efforts to extract lipids from microalgae to disrupt the cell wall, including hydrodynamic cavitation [8], stirring (homogenization), ultrasonication, microwave [9], and high-shear mixer [10].…”