id	keyword
cet-5721	gasification
cet-5721	biomass
cet-5721	filter
cet-5721	tar
cet-5721	olivine
cet-5721	bed
cet-5721	gasifier
cet-5721	char
cet-5721	particles
cet-5721	time
cet-5721	presence
cet-5721	process