In the current assay, Brewer's spent grain
(BSG), obtained from a single lot after the filtration stage during the production of Pilsen malt pure beer, was kindly supplied by Micro Brewery Bier Hoff (Curitiba, Parana State, Brazil).
A small amount of simple sugar, mostly maltose, remains in spent grain
, along with 7 to 10 percent crude fat.
is the leftover malt and adjuncts after the mash has extracted most of the sugars, proteins and nutrients in the beer-making process.
The agro-industrial wastes brewer's spent grain
, soybean peel, corn straw, passion fruit peel, soybean waste, orange peel, pineapple peel, wheat bran, apple peel, sugarcane straw and sugarcane bagasse were obtained locally.
Hughes picks up barrels of spent grain
from several brewers and distillers each week including Lazy Boy and Diamond Knot.
In comparison with original raw grain samples the analysis of thermally treated (pyrolysis) spent grains
revealed the presence of high carbon and low oxygen contents.
The press provided greater efficiency and resulted in a dryer spent grain
, which improved the grain's ability to be used as a fuel source.
The Alaskan Brewing company purchased a furnace outfitted to bum spent grain
, creating steam, which can power most of the brewing process, offseting energy costs by 70 percent per year.
The Alaskan Brewing Company of Juneau, AK, is now using spent grain
as the sole fuel source for their steam boiler.
Leftovers: Yeast may be turned into Marmite; yeast and spent grain
may be fed to farm animals, used hops are used as fertiliser.
WORT BOILING The mashed liquid is then transferred to the second copper tank where the spent grain
is filtered from the still hot liquid to obtain the wort.
Made with organic vegetable broth, Boneyard Brewery spent grain
, glucosamine and other goodness, it may be served straight or over food.