Table 2.

Efficiency comparison of several common flocculants for microalgal biomass harvesting

Flocculants	Optimal dosage, g/L	Species	Algal biomass concentration, g/L	Efficiency, %	References
Chitosan	0.25	Chlorella vulgaris	1.2	91.9	This study
Chitosan	0.05	Chlorella vulgaris	0.5	92.3	This study
Cationic inulin	0.06	Botryococcus sp.	–	88.6	[34]
Cationic cassia gum	0.08	Chlamydomonas sp.	0.85	92	[24]
Cationic starch	0.03	Scenedesmus dimorphus	0.12	91	[19]
Aluminum sulfate	2.5	Chlorella vulgaris	1.2	92.4	This study
Aluminum sulfate	0.8	Scenedesmus spinosus	0.4	99.1	[18]
Ferric sulfate	1.5	Scenedesmus spinosus	0.4	61.6	[18]
Ferric chloride	1.1	Chlorococcum sp.	–	92	[21]
Iron oxide	0.3	Chlorella ellipsoidea	0.8	90	[35]
Yttrium iron oxide	2.5	Chlorella vulgaris	0.82	93	[36]