Table 11.

Comparison between common four microalgae drying methods.

Method	Advantages	Disadvantage
Sun drying	(i) Cheap (no running cost, low capital cost)	(i) Difficult (ii) Slow (iii) Weather dependent (iv) Require large surface (v) Contamination
Spray drying	(i) Fast (ii) Continuous (iii) Efficient	(i) Cost intensive (ii) Species deterioration (i.e. pigments)
Drum drying	(i) Fast (ii) Efficient (iii) Sterilization advantage	(i) Cost intensive
Freeze drying	(i) Gentle	(i) Slow process (ii) Cost intensive