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Capacitive Deionization Technology

Harness the Power of CDI Technology

A Smart, Sustainable Solution for Water Purification

Capacitive Deionization (CDI) is a cutting-edge water purification technology designed to efficiently remove dissolved salts, ions, and other charged particles from water. Unlike conventional methods that rely on high-pressure membranes or extensive chemical use, CDI leverages electrostatic forces within a simple yet powerful electrical system—making it an eco-friendly, low-energy alternative for desalination and deionization.

The Science Behind CDI Technology

Capacitive Deionization

At the heart of CDI is a pair of high-surface-area, porous carbon electrodes — each with excellent electrical conductivity and ion adsorption capacity. These electrodes are separated by a water-permeable spacer that allows raw water to pass between them.

When a low direct current voltage (typically between 0.8 to 2.0 volts) is applied across the electrodes, they become electrically charged. This creates an electric double layer at the electrode surfaces, which attracts and captures oppositely charged ions from the water. For example, positively charged sodium (Na⁺) ions are attracted to the negatively charged electrode, while negatively charged chloride (Cl⁻) ions move toward the positively charged electrode. As ions are removed from the water stream, the output is purified, low-salinity water.

Once the electrodes are saturated with ions, they are regenerated by reversing the polarity of the applied voltage. This discharges the adsorbed ions, producing a concentrated waste stream that is safely flushed out. The system then resumes normal operation, making CDI a cyclic, continuously operable process with a high recovery rate and low waste generation.

CDI Working principle

Diverse Industrial Applications

CDI’s modular and scalable design makes it uniquely adaptable to a wide range of applications. CDI aligns perfectly with global goals for sustainable water management. As water scarcity intensifies and the demand for resilient, decentralized water treatment grows, CDI is emerging as a next-generation solution—combining material science, smart engineering, and digital control to redefine the way we access clean water.

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Groundwater

Ensure safe, high-quality water for food and beverage production with our CDI systems.

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Brackish Water

Removing dissolved salts and impurities to deliver high-purity water for manufacturing processes.

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Saline Water

Our CDI purifiers efficiently desalinate and purify water from mining runoff or saline sources

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Industrial Wastewater

Transform wastewater into reusable water with our advanced CDI technology

Key Benefits of CDI

Water recovery

70-85%

No disposal of polymeric substances

Long life of CDI cells

5 Years

Treated water pH is neutral

High TDS handling

2000 ppm

Nanotechnology enabled design

Less O&M Cost

2 paisa/L

Internrt of Things (IoT) integration

Modular & Compact

CDI units

Solar integration for external power

Technology Comparison

Explore how Capacitive Deionization (CDI) stands apart from conventional purification technologies like reverse osmosis, distillation, and ion exchange. Our comparison highlights key differences in energy efficiency, water recovery, maintenance, and environmental impact —helping you understand why CDI is the smarter, more sustainable choice for modern water treatment.

(RO – Reverse Osmosis; TD – Thermal Distillation; IX – Ion Exchange)

Parameter
RO
TD
IX
CDI
Automation
Not Available
Available
Available
Available
TDS removal at high temperature
Not Available
Not Available
Not Available
Available
TDS reduction
> 97%
Tunable
Only hardness
Tunable
Energy requirement
High
High
Low
Low
System size
Medium
Large
Medium
Compact
RMS (Remote monitoring system)
Not Available
Available
Not Available
Available
Fouling
High
Very high
Low
Low
Chlorine tolerance
Not Available
Available
Available
Available
Use of Chemicals
High
High
High
Low
Process
Mechanical
Elec./mech.
Chemical
Electrical
Consumables
High
Medium
Low
Low
Maintenance
High
High
Medium
Low

Research & Development

Our innovation begins at the material level

Developing low-cost, sustainable solutions for next-generation water purification. Backed by the world-class research infrastructure at IIT Tirupati, our R&D team focuses on creating efficient, eco-friendly materials and technologies that drive our products.

 

From lab-scale breakthroughs to scalable industrial applications, we are committed to pushing the boundaries of water treatment science for a cleaner, more sustainable future.

CALL US

+91 7397 6334 55

EMAIL US

OPENING HOURS

Mon - Sat: 9:00 AM - 5:00 PM

NGEN

Water Solutions Pvt. Ltd.

An IIT Tirupati Incubated Company

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OUR SERVICES

- Customized CDI Water Purification Solutions

- Community Drinking Water Systems

- Maintenance & Technical Support

- Water Quality Testing

- Consultation

VISIT US

Registered Office:
Indian Institute of Technology Tirupati
Merlapaka Village, Yerpedu Mandal

Tirupati District, Andhra Pradesh

India, 517619

Tel: +91 7397 6334 55

Email: marketing@ngenwater.com

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