The number of anaerobic digesters on farms continues to expand, growing tenfold between 2000 and 2020 (see graph below). As of this year, there are 255 anaerobic digesters in operation and 33 more under construction, according to the U.S. Environmental Protection Agency’s Ag STAR program. Of those farms operating digesters, 205 have dairy cattle, 44 raise hogs, eight have beef cattle, and seven raise poultry. Some digesters accept manure from more than one species, which is why this total exceeds 255.
This article appeared in the November 2020 issue of Journal of Nutrient Management on page 9.
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