Publications by authors named "Teo Chee Loong"
Evaluation of direct transesterification of microalgae using microwave irradiation.
Bioresour Technol
December 2014
Nannochloropsis sp. wet biomass was directly transesterified under microwave (MW) irradiation in the presence of methanol and various alkali and acid catalyst. Two different types of direct transesterification (DT) were used; one step and two step transesterification.
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- Biodiesel was produced with a higher yield from microalgae (Nannochloropsis sp. and Tetraselmis sp.) using a technique called simultaneous cooling and microwave heating (SCMH).
- Compared to conventional heating (CH) and microwave heating (MWH), SCMH yielded superior results, showing 83.33% from Nannochloropsis sp. and 77.14% from Tetraselmis sp.
- The optimal conditions for SCMH included using a microwave set to 50°C for 16 hours, alongside cooling at 15°C, resulting in biodiesel with good ignition and lubricating properties based on GC analysis.
Article Synopsis
- The study explored how different LED light qualities and intensities affected the production of fatty acid methyl esters (FAMEs) from Nannochloropsis sp. over a 14-day period.
- The optimal light conditions for biomass growth and lipid content were identified as red LED at 150 μmol, blue LED at 100 μmol, and mixed red-blue LED at 200 μmol.
- Results indicated that LED light quality and intensity significantly impacted FAME composition, with blue LEDs producing FAMEs with high unsaturation and low cetane number, while red LEDs produced the opposite, and the mixed combination yielded favorable ignition and stability properties.
Article Synopsis
- The study focuses on how the choice of microalgae strains and lipid extraction methods affect crude oil productivity.
- Two strains, Nannochloropsis sp. and Tetraselmis sp., were selected, and four lipid extraction methods (Hara and Radin, Folch, Chen, and Bligh and Dyer) were tested using both conventional heating and microwave irradiation.
- The highest lipid yields were obtained under microwave irradiation: Tetraselmis sp. with Hara and Radin (8.19%) and Nannochloropsis sp. with Folch (8.47%), and the extracted lipids were later transesterified to produce and analyze biodiesel quality using gas chromatography.
Wavelength of light is a crucial factor which renders microalgae as the potential biodiesel. In this study, Tetraselmis sp. and Nannochloropsis sp.
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