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QUA FEDI®

Fractional Electrodeionization Process

QUA’s Fractional Electrodeionization (FEDI)® is an advancement of EDI technology developed to address the limitations of traditional EDI. FEDI’s dual voltage process allows for higher flexibility and tolerance to inlet water to lower the risk of scaling and improve the plant’s design economics and reliability.

Download the FEDI brochure
FEDI
FEDI GIGA
FEDI RX
FEDI Technology
FEDI Stack

Advantages of FEDI Fractional Electrodeionization

01 / 04
Produce High-Purity Water

Produce High-Purity Water

Produces high-purity to ultra-pure water with very low levels of silica and boron.

Greater Intake Flexible

Greater Intake Flexible

Flexibility to handle feed condition variations due to its dual voltage operation, lowering the risk of scaling.

Optimize Power Consumption

Optimize Power Consumption

Use higher electrical current only when required, optimizing plant economics.

Increase Plant Reliability

Increase Plant Reliability

No regeneration of the FEDI units is required, which means no downtime, increasing plant reliability.

FEDI Technology

There are two types of ionic impurities removed in an EDI process: strongly ionized impurities (divalent ions such as Ca, Mg, SO4 and monovalent ions such as Na, Cl and HCO3) and weakly ionized impurities (such as CO2 B and SiO2). Both ionic impurities require a different driving force (current) for movement and separation. Strongly ionized impurities require less current, whereas weakly ionized impurities require more. 

Rather than applying one current to the entire module, the FEDI process differentiates the treatment of weakly ionized and strongly ionized impurities by applying different currents and voltages in a two-stage process. This allows a significant portion of strongly ionized impurities, mainly the divalent ions, which can cause precipitation at a higher voltage, to be removed in Stage 1. Subsequently, a higher voltage is applied to remove weakly ionized impurities in Stage 2. The rejected ions from both stages are removed using separate reject streams, thus preventing hardness precipitation.


FEDI Two-Stage Separation

Hardness is the scaling component and the main limiting factor for feed conditions in a conventional EDI. By incorporating a two-stage separation process with different voltages, the FEDI process can:
  • Achieve a higher hardness tolerance by having distinctly different concentrate chambers with separate reject streams, thus reducing the potential of hardness scaling.
  • Optimize power consumption by using higher electrical current only where required.
  • Ensure the best water quality, continuously, and consistently by removing a major part of the deionization load in the ‘hardness removal zone,’ while residual ionic impurities are effectively removed in the ‘silica removal zone,’ which stays in a polishing mode.

FEDI stacks are designed to produce high purity water up to 18 MΩ.cm using a patented process with double sets of electrodes per stack. The FEDI stack is designed to replace mixed bed technology and produces pure water continuously, without the use of regeneration chemicals. Applications include the semiconductor, power, pharmaceutical, and food and beverage industries. FEDI-2 is available in two operating modes: Dual Voltage (DV) and Single Voltage (SV). The stacks contain media on the concentrate side, eliminating the need for a salt injection.

Download the FEDI-2 Datasheet

FEDI stacks are designed to produce ultrapure water up to 18 MΩ.cm using a patented process with double sets of electrodes per stack. FEDI replaces mixed bed technology and produces pure water continuously without the use of regeneration chemicals. The stacks are designed for operation after double pass reverse osmosis. The stack has ability to produce ultrapure water with high flow rate using a patented “Split Flow EDI” technology. Applications include the semiconductor, power, food & beverage and pharmaceutical industry.

Download the FEDI HF Datasheet

The FEDI-GIGA stack is a next-generation electrodeionization stack that is designed to produce ultrapure water with a high flow capacity. It can minimize associated piping and instruments due to its unique design feature – one inlet and two outlet ports. It is the first electro-deionization stack with three ports Feed, Product & Reject.

Download the FEDI GIGA Datasheet

FEDI Rx stacks are a pharmaceutical grade water system featuring hot water sanitization ability at 85°C. These stacks have the ability to produce high purity water quality up to 18 Mcm using a patented process with double sets of electrodes per stack. FEDI Rx stacks are available in four sizes (5X, 10X, 20X & 30X). These stacks have widespread application in Pharmaceutical, Biomedical & Laboratories where hot water sanitization is required.

Download the FEDI RX Datasheet

Experience unparalleled water purity with our Mobile Fractional Electrodeionization (FEDI) fleet. By combining the power of ion exchange, electrochemistry, and cutting-edge membrane technology, FEDI can consistently produce high-purity water by removing hardness and silica, ensuring unmatched process water purity.

We understand the importance of flexibility, so we offer flexible financing options, allowing you to lease or rent our Mobile FEDI solutions, so you can easily transition from capital to operating expenditures.

About QUA Membranes

About QUA Membranes

QUA is a pioneering innovator of advanced membrane technologies designed to address the most challenging water treatment applications. Headquartered in the United States, QUA is committed to ongoing innovation, leveraging its deep roots in research and development and the expertise of highly experienced global team. 

QUA’s diverse product portfolio includes FEDI® fractional electrodeionization, Q-SEP® hollow fiber ultrafiltration membranes, CeraQ™ ceramic membranes, and EnviQ® flat sheet and hollow fiber submerged ultrafiltration membranes.

Visit QUA's Website

Our Work

01 / 01
ETHYDCO Transforms Petrochemical Water Management with Egypt's First Zero Liquid Discharge Plant

ETHYDCO Transforms Petrochemical Water Management with Egypt's First Zero Liquid Discharge Plant

Alexandria, Egypt

Aquatech was contracted by the Egyptian Ethylene and Derivatives Company (ETHYDCO) to provide a water treatment facility that includes the first integrated zero liquid discharge plant in Egpyt.

Read More

The Latest News

QUA Inaugurates New State-of-the-Art Membrane Manufacturing Facility

QUA Inaugurates New State-of-the-Art Membrane Manufacturing Facility

QUA, an Aquatech company, announces the commencement of production at its new state-of-the-art membrane manufacturing center in Pune, India.

Read More
Sugata Das Discusses the Future of Membrane Technology and QUA's Role in Advancing Filtration Technology with Everything About Water Magazine

Sugata Das Discusses the Future of Membrane Technology and QUA's Role in Advancing Filtration Technology with Everything About Water Magazine

QUA's Director of Manufacturing & Operations discusses the filtration market growth, the inauguration of its new membrane manufacturing center, and the future industry challenges with Everything About Water Magazine.

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FEDI® GIGA: QUA's Next Generation of Fractional Electrodeionization Technology

FEDI® GIGA: QUA's Next Generation of Fractional Electrodeionization Technology

QUA Group has unveiled its latest breakthrough innovation, FEDI GIGA, a high-flow fractional electrodeionization (EDI) solution that revolutionizes the microelectronics and semiconductor industries.

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QUA Group Expands Water Treatment Offering With Three Cutting-Edge Membrane Technologies

QUA Group Expands Water Treatment Offering With Three Cutting-Edge Membrane Technologies

With the introduction of FEDI GIGA, EnviQ RF, and Q-SEP Q-Connect, QUA strives to continuously innovate and ensure a comprehensive product portfolio that caters to its customers' diverse water treatment needs.

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Celebrating the Commencement of QUA's New Membrane Manufacturing Facility

Celebrating the Commencement of QUA's New Membrane Manufacturing Facility

QUA unveils its new cutting-edge membrane manufacturing facility in Pune, India, marking a significant leap forward in water treatment innovation and global impact.

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Contact us today to learn more about our QUA FEDI Fractional Electrodeionization Process.

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