Document Type

Journal Article

Publication Date



Microalgae biomass harvesting, cationic magnetic nanoparticles, microalgae biofuel production, flocculation and magnetic separation


Increasing energy consumption due to rapid urban development has generated huge amount of CO2 emission over the decades, resulting in alarm level of global CO2 concentration (>400ppm) and adverse climate changes have been frequently shown that such global environmental impact should be mitigated. In order to achieve the goals of sustainable growth and carbon neutrality by 2050, a significant reduction of fossil fuels combustion for electricity generation should be implemented. Apart from traditional renewable energy sources like solar and wind energy that have been adopted for many years, microalgae biofuel recently has been proposed for potential large scale application and promising results have been reported. However, due to the properties of diluted cells densities and small cells size of microalgae that a high energy consumption was required for its biomass collection before downstream processing of the biofuel production, for example, conventional cells harvesting methods like centrifugation and filtration consumed 20-30% of the overall energy requirement of the processes. On the other hand, past studies showed that microalgae cells with negatively charged surface can be easily flocculated by simple and inexpensive cationic flocculants, however, effective collection of the flocculated cells and removal of residual flocculating agent from spent medium were required. In the present study, a marine green microalgae Tetraselmis sp. was selected for conducting the growth optimization study under different pH and salinities conditions. A novel cationic polymer (polydiallyldimethylammonium chloride; PDDA) coated iron oxide (Fe3O4) was synthesized to conduct the rapid microalgae cells flocculation (

Source Publication

2023 4th Asia Conference on Renewable Energy and Environmental Engineering (AREEE 2023)