Rispri LabsENGINEERING A CIRCULAR FUTURE

RESOURCE RECOVERY AND WASTE TO VALUE / 04

Ready: level 7 to 9 of 9Already in useDistillery

Potash fertiliser from distillery ash.
Turn distillery ash into potash fertiliser.

Your distillery burns spent wash and is left with ash to dispose of. The potassium in the ash is dissolved out and cleaned to make potash fertiliser that dissolves fully in water.

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GETTING SALT, SOLVENTS AND METALS BACK FROM WASTEWATERDelivered by Rispri Labs
Getting salt, solvents and metals back from wastewater
Getting salt, solvents and metals back from wastewater

What it achieves

The key numbers.

100%

water-soluble potash.

15 t/day

scale already running.

50%

potash in the second product.

Problem and fix

The problem this solves.

  1. 01
    The problem

    Your distillery burns spent wash and is left with ash to dispose of.

    How it is fixed

    The potassium in the ash is dissolved out and cleaned to make potash fertiliser that dissolves fully in water. Another method makes potash from plant and spent wash ash without acids.

How it works

Step by step.

  1. 1

    Collect

    Ash from burning spent wash is collected.

  2. 2

    Dissolve

    Potassium salts are dissolved out.

  3. 3

    Purify

    The solution is cleaned and crystallised.

  4. 4

    Pack

    Potash fertiliser is dried and bagged.

Key features

Why it works well.

Already running at a distillery.

  • Extra incomeA saleable product from a waste.
  • Replaces importsLocally made potash.
  • No acidsThe second method uses no harsh chemicals.
  • Zero wasteNo new waste stream.

At a glance

The details.

InputSpent wash ash or biomass ash
OutputWater-soluble sulphate of potash, or potash with sulphur
Running scaleAbout 15 tonnes a day at one distillery
Ready levelLevel 7 to 9 of 9 (already in use)
ScaleDistillery
Used inDistillery, sugar

Costs are indicative and change with your water, site and plant size. We confirm them after testing a sample.

Where it is used

Who it is for.

  • Molasses distilleries
  • Sugar mills
  • Biomass power plants

Questions

Frequently asked questions.

Is this technology proven?

Yes. It is at ready level 7 to 9 of 9, which means: already in use. Already running at a distillery.

Can we try it on our own water first?

Yes. We test a sample in our NABL-accredited lab and, where it helps, run a small trial on your site before you invest in a full plant.

Do you supply and install it?

Yes. We design, supply, install and start up the system, train your staff, and our lab checks the treated water.

Getting salt, solvents and metals back from wastewater

Ready: level 9 of 9Clean salt back from tannery and dyeing wastewaterYour ZLD plant leaves tonnes of mixed salt every month that you cannot sell or dump.Ready: level 9 of 9Removing salt so steel plant water can be reusedSteel plant wastewater has too much chloride, which rusts pipes, to be reused.Ready: level 6 to 8 of 9Getting costly solvents back from wastewaterPharma and fibre plants lose expensive solvents into their wastewater, then pay again to treat it.Problem guideZLD Salt Piling UpYour ZLD plant solved the water problem. Now you have a salt problem. Here is how to fix it.

THE NEXT STEP

Fix it on
your own site.

Send us a water sample or a test report. We will check it, confirm this method fits and tell you what it costs to run.

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THIS SEGMENTResource recovery and waste to valueALL TECHNOLOGIESAll proven technologies