Assertion: anaerobic digestion | /r/HasProperty | popular
Facets:
value: among the water boards
type: OTHER
value: in the western nations
type: LOCATION
Source sentences:
text: In the western nations during the first half of the 20th century, anaerobic digestion had been popular among the water boards, and municipal corporations in charge of the safe disposal of sewage sludge, but almost all of those had, by then, been replaced by incinerators.