Electrodialysis is an industry-ready membrane process used for pollution control, desalination, resource recovery and chemical processing. It can be used to produce potable water from brackish sources and remove salts from foodstuffs, recover salts from effluent, and split salts into their constituent acid and base, for example for recovery of mixed acids from spent pickling liqour.

C-Tech has many years of experience in the field of electrodialysis and has fabricated electrodialysis cellstacks as part of EU and TSB funded projects. These range from small units treating around 50ml of fluid to larger stacks with throughput of hundreds of litres. C-Tech is currently a collaborator in a number of TSB funded projects which involve electrodialysis and has experience in the following:

  • The recovery of hydrofluoric acid and sodium hydroxide from a dilute sodium fluoride effluent stream.
  • The in-situ and downstream removal of organic acids from enzyme reactions and fermentations, which helps reduce reaction inhibition thereby increasing target molecule productivity.

C-Tech has successfully applied two-compartment electrodialysis with bipolar membranes (EDBM) in industrial contexts to recover a pure organic acid from a mixture of base and salt.

Electrodialysis laboratory installation

A desktop electrodialysis system developed by C-Tech

Key benefits of electrodialysis

  • Reduce waste disposal costs by recycling
  • Improve product purity by removing salt
  • Converts salt product to free acid or base
  • Improve volume efficiency by decreasing product inhibition
  • Can be applied in situ, as well as downstream processing

Electrodialysis Applications


Electrochemical enhancement of fermentative succinic acid production to reduce costs and improve efficiency.


Utilisation of electrodialysis (ED) membranes for the recovery of amino acids from enzymatic reaction mixtures.

Pete Eddowes

Electrodialysis Project Manager

Have a question about electrodialysis?

Contact Pete