Salt load reduction of highly saline industrial wastewater by using the innovative electrodialysis process
operational area | usage
- Industrial wastewater treatment
- For wastewater or wastewater partial flows with a conductivity of 50 mS/cm or higher, can be used effectively for wastewater quantities of 50 to 500 m³/d
- In combination with wks dosing technology
- Modular structure
- Concentrate treatment with membrane distillation through to material recovery possible
- Seawater and brackish water desalination
Technology | Process
The desalination takes place by means of an electrochemically driven membrane process. Ion exchanger membranes are used in combination with an electrical potential difference for partial desalination. A wastewater-dependent realisation with pole reversal is possible so that, in combination with suitable treatment chemicals, the treatment can take place under energised conditions. The process is characterised by conductivity-dependent, batch operation of the concentrate, diluate flow and electrode rinsing.
Depending on the wastewater characteristics, the wastewater is pretreated by suitable filtration processes. The concentrate (10–20 %) is fed into a concentrate store.
The dilute (80–90 %) is added to the treatment process. An appropriate conductivity-dependent control system ensures automatic treatment with wastewater-specific treatment chemicals (Cleaning In Place “CIP”).
Process Engineering Components
- Process-relevant equipment for pretreatment
- Electrodialytic equipment
- Membrane packages, CIP
- Automation technology
- Energy-efficient partial desalination
- Depending on the membrane selection, selective desalination of monovalent ions possible
- Increase in membrane service life by operating with pole reversal
- Wastewater-specific manufacturerindependent membrane selection
- Wastewater-specific selection of the optimum CIP recipe