id	keyword
brj-22347	extraction
brj-22347	sludge
brj-22347	sar
brj-22347	heptane
brj-22347	asphaltene
brj-22347	heptane extraction
brj-22347	et al
brj-22347	petroleum
brj-22347	sar extraction
brj-22347	doi
brj-22347	components
brj-22347	analysis
brj-22347	soil
brj-22347	chloroform