Brewers Spent Grain to make IMOs
Top answer
From the KNF library
Drake says spent grain can go into an IMO3 pile if you add carbohydrate back. (Office Hours Ep. 29, 39:42) (Office Hours Ep. 70, 51:59)
Blend in extra carbohydrate like powdered potato, since the yeast already consumed the sugars. (Office Hours Ep. 29, 39:42) In another session, Drake said to amend it with mashed potato, since brewing strips out the sugars. (Office Hours Ep. 70, 51:59)
A written source reads a little differently. It lists spent grains from a brewery among the inputs that may replace wheat mill run as the carbohydrate source in IMO3. (Unravelling the Mysteries of KNF, p. 60) It also says no studies compare how well the different carbohydrate sources work. (Unravelling the Mysteries of KNF, p. 60)
The library gives no potato amounts. It says nothing about stabilizing the grain or handling its nitrogen. It does not cover IMO5 or JLF uses for spent grain.
Sources
- 39:42 Office Hours Ep. 29 (May 2022) — Red Dirt for IMO4, Storing IMO3/IMO4, Spotting Bad KNF Ferments · “Yes, but blend in extra carbohydrate like powdered potato since the yeast already consumed the sugars.”
- 51:59 Office Hours Ep. 70 (Apr 2023) — Piglet Birth, Mastitis Antibiotics, and Chick Feed Regimen · “Yes, but amend it with carbohydrates like mashed potato, since brewing strips out the sugars.”
- p. 60 Unravelling the Mysteries of KNF · “macadamia nut shells (preferably ground), spent grains from brewery”
