Sectors / Distilling
Closing the water loop in rum distillation
For every litre of rum, a distillery produces many litres of vinasse, known as dunder in the Caribbean, and many distilleries sit where fresh water is precious. Danu Water turns vinasse and cooling blowdown into reuse water, potassium fertiliser and more biogas.
In an exemplar distillery
- 55%less fresh water
- ~80%less effluent discharged
- ~1,400 tpotassium fertiliser a year
- +10%biogas from protected digesters
Desk modelling of an exemplar molasses distillery with anaerobic digestion, based on public data. Not site data.
Where Danu Water fits
Danu Water product
Scroll sideways to see the whole process.
These are jobs, not a fixed line-up
The applications illustrate the jobs that are often needed in a distillery. In practice, we design around each site's own combination of problems. Where and how much water we take, and where we return it, is up to you. Often a single unit can do several jobs, or a pair are designed to work together.
Application
Water and potassium recovery
Recovers reuse water and a potassium fertiliser product from digested vinasse.
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More backset to fermentation
Removes salts from backset so more dunder can return to fermentation, saving dilution water.
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Sulphate control for digesters
Cuts sulphate ahead of anaerobic digestion, reducing hydrogen sulphide and lifting biogas output.
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Cooling blowdown recovery
Desalts cooling tower blowdown and returns it to the tower, cutting make-up water.
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Talk to us about your distilling site
Share what you know about your water, even roughly, and we will tell you where Danu Water fits.