The technology from the digester originally came from Germany where, like other European countries, there are many digesters already operating. The U.S. company now making the equipment is Quasar Energy Group, which has installed two of these digesters at farms in Ohio, with the largest having an electrical output of 1 megawatt. The dome is a membrane that protects the inner membrane which rises and falls depending on how much gas is produced.
April 4, 2011 4:00 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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