Energy potential of sewage is being explored

David Parry, Northwest regional president for Camp Dresser & McKee, an engineering and consulting firm, makes a good case for turning sewer gas into energy.

As he explained to commissioners and staff for West Sound Utility District and Silverdale Water District, you need to remove carbon dioxide and impurities from biogas to get a high-quality methane, which is essentially natural gas that can heat buildings, run cars or generate electricity. Read more details in my story published in Sunday’s Kitsap Sun. Responding to a question, Parry did a quick back-of-the-envelope calculation about the costs and potential of converting biogas generated at West Sound’s sewage-treatment plant near Retsil. Conversion equipment would cost roughly $500,000, he said, and it would produce an amount of natural gas equivalent to about 100 gallons of gasoline a day.

After hearing his talk, it makes sense to me that sewage-treatment plant owners and operators should at least consider some kind of system for using the energy that would otherwise go to waste.

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