Abstract
In order to secure more effective lipid extraction method, this research investigated new lipid extraction method using laser with absorbent and sought its optimum operation control. In addition, this study compared lipid extraction efficiency and FAME conversion rate between laser extraction method at optimum condition and existing extraction method. Results from experiments for optimizing lipid extraction method using laser showed that the maximum extraction efficiency (81.8%) was attained when using laser with an output capacity of 75Wh/L. Extraction efficiency increased up to 90.8% when microwave treatment as pretreatment process was conducted. Addition of absorbents during lipid extraction process with laser showed higher extraction efficiency than laser and chemical method. It was also found that laser extraction method with absorbent had higher total fatty acid content (853.7 mg/g oil) in extracted lipid than chemical extraction method (825.4 mg/g oil). Furthermore, it had the highest FAME conversion rate (94.2%).
Highlights
In order to secure more effective lipid extraction method, this research investigated new lipid extraction method using laser with absorbent and sought its optimum operation control
Results showed that lipid production capacity and content of Scenedesmus sp. as target microalgae was 9.5 mg/(L·day) and 133.2 mg/g of cell respectively and fatty acid content per cell in comparison with dry weight was 13.2±0.73 mass% (d.b.)
Scenedesmus sp. used as a target microalgae in this study showed lower total lipid content (13.2±0.73 mass% (d.b.)) than the results reported by Kim et al [17] on the lipid content of microalgae
Summary
In order to secure more effective lipid extraction method, this research investigated new lipid extraction method using laser with absorbent and sought its optimum operation control. This study compared lipid extraction efficiency and FAME conversion rate between laser extraction method at optimum condition and existing extraction method. Addition of absorbents during lipid extraction process with laser showed higher extraction efficiency than laser and chemical method. It was found that laser extraction method with absorbent had higher total fatty acid content (853.7 mg/g oil) in extracted lipid than chemical extraction method (825.4 mg/g oil) It had the highest FAME conversion rate (94.2%). Among the aforementioned production processes, lipid extraction process has been regarded as an obstacle to biodiesel production due to the high cost problems and low extraction rate [2] Several methods such as expeller/press, solvent oil extraction, Soxhlet extraction, hydro-cracking, pyrolysis, liquefaction and hydrogenation have hitherto been used to extract lipid from microalgae [5]. Issariyakul and Dalai [10] proposed better method of removing such inhibitors using absorbents
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