Bacteria at a plant in Grangemouth eat the leftovers of Scotland's whisky industry — almost 750,000 tons of spent barley and two billion liters of pot ale a year — and excrete acetone, ethanol and butanol, with the butanol close enough to gasoline to burn in an unmodified engine

Bacteria at a plant in Grangemouth eat the leftovers of Scotland's whisky industry — almost 750,000 tons of spent barley and two billion liters of pot ale a year — and excrete acetone, ethanol and butanol, with the butanol close enough to gasoline to burn in an unmodified engine

Every liter of Scotch whisky leaves a mess behind it. For each liter of the spirit, a distillery produces roughly two and a half kilograms of spent barley