Electrodialysis in water treatment

Electrodialysis in water treatment

Removal of dissolved solids by electro-membrane technology

Did you know?

Electrodialytic phenomena present a great potential for application in the dairy industry. Many of these applications have to be discovered. And so we do.

MEGA Electrodialysis technology

Advantages of MEGA ED in water treatment

Advantages of MEGA ED in water treatment

  • High water recovery up to 95 %
  • High concentration of brine TDS up to 200 g/l
  • Less susceptibility to organic fouling
  • Strong chemicals for cleaning (cid + caustic)
  • Tolerance to free residua chlorine
  • Silica does not affect water recovery
  • 10+ years of membrane lifetime
  • Robust solution
MEGA electrodialysis applications in water treatment

MEGA electrodialysis applications in water treatment

As a water pollution is growing globally as an important issue the main benefits of using electrodialysis in water treatment are:

  • Zero Liquid Discharge
  • Wastewater from paper machine
  • Desalination of high ‑silica water
  • RO brine treatment
  • Condensate treatment from fertilizer production (NPK, NH4NO3)
  • Textile wastewater
  • Cooling tower blowdown treatment

Ask our experts for help with your project

What is electrodialysis


Electrodialysis (ED) is an electric field gradient-driven process enabling the separation of mineral matter from feed water solution while moving dissociated ions, that are either positively or negatively charged (cations or anions), through ion selective membranes and forming two different flows – desalted flow diluate and concentrated flow concentrate (brine).

The  scheme of the electrodialysis reversal

What is electrodialysis reversal?

The electrodialysis reversal (EDR) is a continuous self-cleaning electrodialysis process by means of periodic reversal of the DC polarity and switching concentrating and diluting flow streams.

Thanks to the self-cleaning process the membranes have a much longer lifetime in the EDR stacks.

The  scheme of the bipolar membrane electrodialysis

What is bipolar membrane electrodialysis?

Electrodialysis bipolar membrane proces (EDBM) is based on the unique property of bipolar membrane (BM) - electro-dissociation of water. Basicaly BM effectively divide water into H+ and OH- under the influence of the applied electric field.

MEGA bipolar electrodialysis stack consists of bipolar and monopolar (cation/anion-exchange) membranes, which convert waste salts into acids and bases.

This proces is kown as a Non-thermal ZLD proces.

MEGA Electrodialysis Application Overview

MEGA ́s electrodialysis bipolar membranes for industrial use

Non-thermal ZLD process is used for a recovery of acid and caustic from waste salts for local use. It is environmental friendly technology, that decrease of operating expenditures for waste water treatment plant.

  • Unique low-cost membranes
  • High feed water limits for total hardness
  • Increased mechanical stability
  • Long life-time
  • Modules for reduced maintenance
  • Elimination of thermal treatment
  • Reduction of waste water
  • Production of acid/caustic for re-use

ED vs RO

ED vs RO

ED is an electrically-driven method of removing dissolved ionic compounds

ED is suitable technology for the following cases:

  • Treatment of water with a higher tendency to fouling or variable quality of feed
  • High recovery is required
  • High concentration of concentrate is required (up to 200 g/l)
  • High silica waters
  • Suitable for existing plants without need of external pre-treatment
RO is a pressure-driven method of removing dissolved solids

RO is a pressure-driven method of removing dissolved solids

RO is suitable technology for the following cases::

  • Treatment of water with a low tendency to fouling and constant quality of feed
  • High recovery not strictly required
  • High concentration of concentrate is not strictly required
  • High rejection required, i.e. a high degree of desalination

Electrodialysis batch system

The main benefits of ED

  • Higher resistivity against organic fouling
  • Tolerance of EDR membranes to chlorine
  • Resistivity against risk of scaling
  • Silica does not affect EDR performance

Request a free quotation for your ED water treatment project

Our experts are ready to answer your questions and find the best solution for your ED water treatment project.

Please, fill out the form below. We will reach out to you as soon as possible and look forward to working with you to find the best possible solution for your facility.


Interested? Contact us.

Tomas Dornik

Tomas Dornik

Sales Manager West

+420 601 342 268 tomas.dornik@mega.cz
Oleksandr Bornosus

Oleksandr Bornosus

Sales Manager East

+420 722 459 239 oleksandr.bornosus@mega.cz
Zdenek Divisek

Zdenek Divisek

Area Sales Manager, Americas

+420 725 090 944 zdenek.divisek@mega.cz