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Home » Authors » Ryan Holzem

Articles by Ryan Holzem

Co-digestion considerations for anaerobic digestion systems

September 30, 2015
Ryan Holzem and John F. Katers
One option often considered for dairy farmers currently operating an anaerobic digestion system is the co-digestion of off-farm substrates.
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4 reasons why anaerobic digesters fail

June 29, 2015
John F. Katers and Ryan Holzem
In partial response to the energy crisis in the early 1970s, anaerobic digesters were installed at nearly 200 dairy farms across the U.S., only for the vast majority of these systems to shut down or fail after just a few years of operation. However, with improvements in anaerobic digester technology, as well as a better understanding of the anaerobic digestion process, there was a resurgence of anaerobic digesters being installed on large dairy farms beginning in the late 1990s and continuing to this day.
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042815.digester 1

Considerations for sizing an anaerobic digester

April 28, 2015
John F. Katers and Ryan Holzem
Anaerobic digesters are being more widely utilized on large dairy farms to produce energy from biogas and to stabilize solids (i.e., reduction of volatile solids, pathogens and weed seeds) for use as animal bedding or soil amendment.
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