«Our bench scale testing was a 1 - liter vessel — the bacteria was producing little bubbles in it — and the next size up for us was a 145,000 - gallon anaerobicdigester,» he recalls.
Also, methane produced in anaerobic biomass digesters is economically important as «one of the few proven, economical, large - scale bioenergy strategies» in use today, they say.
With Park Spark, small - scale passive anaerobicdigesters are a common low - tech machine used around the world in places like India, China, and parts of South America.