Rispri LabsENGINEERING A CIRCULAR FUTURE

RESOURCE RECOVERY AND WASTE TO VALUE / 01

Ready: level 9 of 9Already in useFactory

Clean salt back from tannery and dyeing wastewater.
Turn piled-up ZLD salt into salt you can sell.

Your ZLD plant leaves tonnes of mixed salt every month that you cannot sell or dump. The salty water is treated in steps so common salt and Glauber's salt (sodium sulphate) come out separately and clean.

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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.

98.5%

pure common salt.

98.5%

pure Glauber's salt.

Less

hazardous waste stored.

Problem and fix

The problem this solves.

  1. 01
    The problem

    Your ZLD plant leaves tonnes of mixed salt every month that you cannot sell or dump.

    How it is fixed

    The salty water is treated in steps so common salt and Glauber's salt (sodium sulphate) come out separately and clean.

How it works

Step by step.

  1. 1

    Dissolve

    Mixed salt waste is dissolved.

  2. 2

    Separate

    Common salt and Glauber's salt are crystallised in steps.

  3. 3

    Dry

    Each salt is dried and bagged.

  4. 4

    Reuse or sell

    Salts go back to the dye house or to buyers.

Key features

Why it works well.

Both salts are over 98.5% pure, good enough to reuse or sell.

  • Two clean productsBoth salts have good market value.
  • Less storageFrees up hazardous waste yards.
  • Simple processCost-effective and easy to run.

At a glance

The details.

InputMixed salt from ZLD or evaporators
OutputCommon salt and Glauber's salt, each over 98.5% pure
Ready levelLevel 9 of 9 (already in use)
ScaleFactory
Used inLeather, textile

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.

  • Textile dyeing units
  • Tanneries
  • ZLD plants

Questions

Frequently asked questions.

Is this technology proven?

Yes. It is at ready level 9 of 9, which means: already in use. Both salts are over 98.5% pure, good enough to reuse or sell.

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 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.Ready: level 7 to 9 of 9Potash fertiliser from distillery ashYour distillery burns spent wash and is left with ash to dispose of.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.

Discuss your problem
THIS SEGMENTResource recovery and waste to valueALL TECHNOLOGIESAll proven technologies