id	keyword
cet-11941	microalgae
cet-11941	energy
cet-11941	biorefinery
cet-11941	production
cet-11941	drying
cet-11941	extraction
cet-11941	technologies
cet-11941	review
cet-11941	cost
cet-11941	methods
cet-11941	process
cet-11941	chemical