id	keyword
brj-22489	straw
brj-22489	et al
brj-22489	biogas
brj-22489	manure
brj-22489	digestion
brj-22489	rice
brj-22489	wheat
brj-22489	pig
brj-22489	rice straw
brj-22489	cow
brj-22489	wheat straw
brj-22489	sheep
brj-22489	maize
brj-22489	china
brj-22489	doi
brj-22489	9:1
brj-22489	anaerobic
brj-22489	tbp
brj-22489	maize straw