Acid and Base Recycling

Recover, purify, and recycle waste acid. Lower chemical costs.

Flex EDR outfitted with proton selective IonFlux Ion Exchange Membranes recovers and purifies waste acid for re-use. Reducing chemical costs and waste.


We invented a way to turbo-charge diffusion dialysis. Our proton selective membranes enable an electrical driving force to increase acid concentration.

Solutions for:

  • Ion exchange resin regeneration
  • Aluminum anodizing
  • Acid etching
  • Battery acid
  • Metal pickling

Benefit from:

  • Recover any acid: HF, HNO3, HCl, H2SO4, organic acids, and more
  • Recycle acid and reduce chemical costs
  • Reduce waste acid strength, improve safety
  • Proton blocking anion exchange membrane prevents acid leakage
  • Compared to diffusion dialysis: smaller plants, produce highly concentrated pure acid
  • Skid mounted, simple system
  • Fully automated system options
  • Mobile pilot plants available

Our Technologies

  • pH tolerance of 0-12
  • Pure acid is transferred to freshwater via Saltworks’ proton selective IonFlux Ion Exchange Membrane
  • No proton leaking across anion exchange membranes
  • Meet discharge requirements and reuse spent acid
  • Modular, leak-free stack
Saltworks Acid Regeneration

Project Summaries

Flex EDR successfully treated ion exchange resin regeneration acid waste to produce highly concentrated pure acid. The recovered pure acid is kept in a separate stream to be reused, reducing expenditure on new acid.

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Our Expertise Applied to Your Water Treatment Needs.