Cost effective, energy efficient desalination

Capacitive deionization (CDI) is a cost effective, energy efficient technology for desalinating water. CDI systems remove salts from water by applying a voltage that attracts ionic salts. This results in high recovery rates and lower energy consumption compared with reverse osmosis systems that require high hydraulic pressure.

How capacitive deionization works

Feedwater passes between two porous carbon electrodes that have a voltage applied. The electrodes act as a capacitor, attracting the ionic salts but allowing pure water to pass through. When the capacitor becomes fully charged with ionic salts, the voltage is reversed to discharge the salts from the surface of the electrodes and flush the system.

Voltek CDI Units

Voltek CDI units increase efficiency with activated nanofiber electrodes that vastly increase the charged surface area accessible to ions. The Voltek system uses high quality nanofibers with consistent size, and integrated microcontrollers to precisely control charge/discharge cycles. The system delivers real time data and actively monitors TDS, pH, free chlorine sensors, along with flow meter/totalizer and UV light intensity sensors. Voltek CDI technology is in the commercial launch phase. Pilot units have performed for more than three years in the field.

Advantages include:

  • No chemicals, no membranes
  • Lower power consumption than RO
  • Recovery rate equivalent to RO
  • Simple electronic performance monitoring
  • Compact, modular design scales linearly