A Review of Enzymatic Transesterification of Microalgal Oil-Based Biodiesel Using Supercritical Technology

Table 10

Advantages and disadvantages of different microalgal harvesting methods.

Method	Advantage	Disadvantage
Flocculation	(i) High recovery yield (up to 22 TTS)	(i) Flocculants may be expensive
	(ii) Low energy requirement	(ii) Contamination issue may occur
		(iii) Marine environment high salinity may inhibit the process
		(iv) Long process period
Centrifugation	(i) Reliable	(i) Energy intensive
	(ii) Corrosion resistance	(ii) Expensive
	(iii) Easy cleaning	(iii) High speed may deteriorate the cell
	(iv) Rapid	(iv) Cannot be used for species <30 μm
Filtration	(i) Reliable	(i) Filters may need to be replaced periodically
	(ii) Able to collect species of low density	(ii) Membrane blockage
		(iii) High maintenance cost
		(iv) May be slow
		(v) Head loss