Because the makeup of the food waste will vary, the plant operator expects to test incoming material to ensure the right biology in the digester. If too much hydrogen sulfide builds up, for example, it can corrode the machinery. The blue cap is the end of a propeller which will mix the material inside which aids in gas production. The yellow tube is a blower to keep the black outer membrane fully inflated and covering the internal membrane which will rise and fall with the production of gas.
April 4, 2011 4:00 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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