It has already proven its worth as a fertilizer and building material, and even as ain Ancient Egyptian ceramics. As it turns out, cow dung might also have a bright future as a plentiful source of clean electricity, thanks to the planet-warming methane it produces.
The technology isn’t all that hard to grasp. Manure and waste water from the farm’s nearly 7,000 cows are transported and sifted into a 25-million-gallon rectangular pit in the ground called a digester. The liquid sits for about 30 days while methane gas rises to the top of the closed digester. The gas then gets piped into a skid shifter, which separates the methane from hydrogen sulfide and other impurities.
This is where fuel cells lend a helping hand, since they don’t spew out carbon dioxide as a byproduct when running the methane-to-electricity reactions. Bar 20 Dairy uses solid oxide fuel cells made by San Jose-based company. They consist of an anode, a cathode, and an electrolyte that’s sandwiched between two interconnected plates.
Sheheady, whose grandfather started Bar 20 Dairy, told The Daily Beast the farm’s microgrid is running better than expected. The fuel-cell system, which started operating in October, is expected to produce about 8.5 million kilowatt-hours of power per year, which is equivalent to powering over 750 homes, according to Bloom. Right now, the farm is basically making more power than it’s able to use.
Clean being a relative term here.
Very encouraging!
If we don’t keep eating ‘em, I guess.
If only we could harness republicans bullshit
But cows are one of the heaviest polluters on Earth..
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