Reducing Reliance on Fossil Fuel
30 May 2012
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Distillation is energy-intensive but produces co-products which
can be used as a fuel source. Whisky-making results in two key
co-products. Draff is a residue, resulting from malted and unmalted
cereals soaking in warm water to remove the sugars as wort. Spent
wash or 'pot ale' is the residue in the still after fermentation
and distillation of the wort has taken place. Both have
traditionally been reused as animal feed products known as 'dark
grains' or as a fertiliser and soil improver.
The industry is investing in new ways to recover energy from
co-products as an alternative fuel to produce heat and power. This
will significantly reduce reliance on fossil fuels.