id	keyword
brj-23974	straw
brj-23974	et al
brj-23974	energy
brj-23974	wheat
brj-23974	wheat straw
brj-23974	treatment
brj-23974	chemical
brj-23974	doi
brj-23974	article
brj-23974	pretreatment
brj-23974	anaerobic