electrodeionization Articles

  • Electrodeionization

    Electrodeionization (EDI) is a water treatment technology that has gone from an unproven and unknown commodity to one that has revolutionized the industry in the past 20 years. The technology was first introduced to the market in 1987 by Ionpure Technologies. EDI is used in small and large applications. Laboratories use EDI in systems as low as 360 gallons per day (gpd), while power plants, ...


    By Agape Water Solutions, Inc.

  • Electrodeionization, Revolutionary or Evolutionary Technology?

    Electrodeionization (EDI) technology has matured since its commercial introduction over 16 years ago. Acceptance of the technology has been driven by lower costs, higher water quality demands, and improvements in themanufacturing techniques of the product. EDI has not been revolutionary but evolutionary. This paper will review the advancements over the product life cycle and explain the different ...

  • Electrodeionization - Ultrapure water

    Continuous Electrodeionization Process The continuous electrodeionization process (CEDI),  is a system that uses ion exchange resins and electricity  for the production of ultrapure deionized water without chemical processes and without production stops. SIMPEC uses modular systems for the electrodeionization processes. The CEDI modules are installed at the exit ...


    By SIMPEC S.r.l.

  • Spiral wound electrodeionization

    Electrodeionization (EDI) is typically used in combination with RO systems to produce pure or ultrapure water, continuously and without chemicals. This combination eliminates the need for regeneration chemicals and the inherent cost, safety and inconveniences of storage, handling, treatment and discharge associated with ion exchange systems. Power plants, electronics manufacturers and ...


    By Agape Water Solutions, Inc.

  • Comparison of Continuous Electrodeionization Devices

    Electrodeionization (EDI) is the standard method of generating high purity water bypolishing reverse osmosis permeate. The technology utilizes electrical current toremove ionic impurities while continuously regenerating cation and anion exchange resins. EDI is utilized in ...


    By Agape Water Solutions, Inc.

  • Short-Bed Demineralization: An Alternative to Electrodeionization

    Abstract: To be competitive in the deregulated market, power producers are looking for ways to lower operating costs while maintaining a reliable supply. To this end, many plants have investigated innovative technologies for boiler make-up water treatment. One such technology is the combined reverse osmosis (RO) and electrodeionization (EDI) system. While this system offers several benefits, its ...


    By Eco-Tec Inc.

  • Reverse Osmosis and Electrodeionization Alternate to Service DI

    Electrodeionization (EDI) is a chemical free water treatment technology that eliminates the need for off line chemical regeneration. EDI has gone from an unproven and unknown commodity to one that has revolutionized the industry in the past 20 years. Much has been written and discussed about the use of EDI systems for industrial applications such as power plants and semiconductors, where flows ...


    By Agape Water Solutions, Inc.

  • Brazos Electric Generation Facility and Fractional Electrodeionization (FEDI®)

    Overview Brazos Electric Cooperative Power Plant in Cleburne, TX is a nominal 258 MW combined cycle gas fired power plant operating on AGC (Automatic Generation Control) load requirements. The plant uses approximately 54 million gallons of water per year for boiler feed water and NOx control of its combustion turbine. The power plant was originally commissioned in 1997. The ...


    By QUA Group LLC

  • South Coast Steam Power, Puerto Rico and QUA’s Fractional Electrodeionization

    Project Background Puerto Rico Electric Power Authority (PREPA) is the owner of South Coast Steam Power Plant located at Guayanilla in the island of Puerto Rico, about 150 KM south of San Juan. This power station is one of PREPA’s oldest units and uses an oil fired boiler as part of its generation process. The plant decided to replace an ...


    By QUA Group LLC

  • An electrostatic shielding-based coupled electrodialysis/electrodeionization process for removal of cobalt ions from aqueous solutions

    Electrode graphite powder beds were interposed between anode and cathode as intermediate electrodes inside an electrolytic setup. Due to electrostatic shielding they eliminate the applied electric field and therefore stop the electromigration of ions within their mass. It was found that the intermediate electrodes can act as ionic current sinks—ion concentrating compartments and therefore cause a ...


    By IWA Publishing

  • SnowPure Tip: Effective CO2 Removal

    CO2 is difficult for both RO and EDI to remove since it has no charge or is weakly ionized. It is important to remove CO2 in the electrodeionization pretreatment because CO2 lowers EDI product water quality, competes with silica for removal, and may lead to scaling ...


    By SnowPure Water Technologies

  • Heat Sanitization Basics

    Even small numbers of bacteria are a problem for critical water systems like pharmaceutical USP water, dialysis water, and water for ...


    By SnowPure Water Technologies

  • QUA Interviewed by Industrial Waterworld at AMTA Membrane Technology Conference 2016

    QUA’s Director of Sales and Marketing, Fred Wiesler, was recently interviewed by Industrial Waterworld at the American Membrane Technology Association (AMTA)’s Membrane Technology Conference 2016 in San Antonio. Qua's Fred Wiesler describes the company's many offerings, including UF, MBR, and ceramic membranes. Highlighted: fractional electrodeionization (FEDI) technology, which ...


    By QUA Group LLC

  • Increased water treatment plant capacity at a Mexican power station using Micro Media Filters ahead of RO and Replacing EDI with ion exchange

    Abstract: This paper describes the process and equipment used to treat a Mexican secondary water source in order to supply boiler feed make-up to a combined cycle power plant. RO pretreatment is provided by a highly efficient micro media filter that produces a filtrate with a turbidity of 0.1 – 0.2 NTU and an SDI value of 3 – 5. Following the RO, a compressed-bed ion exchange system ...


    By Eco-Tec Inc.

  • QUA’s FEDI Chosen for LNG Refinery

    Project Background Sabine Pass, a large LNG refnery in the United States, required a membrane desalination solution to cater to its extensive process water needs in order to produce a large amount of liquefed natural gas for export.  The water is used for injection for compressor turbines for methane, propane and ethylene, wash water for gas turbines and other utility make-up ...


    By QUA Group LLC

  • Cost reduction and operating results of RO-EDI

    Electrodeionization (EDI) uses electrical current, in lieu of acid and caustic chemicals, to regenerate cation and anion resin. Reverse osmosis/EDI systems are now widely used to replace conventional mixed-bed ion-exchange (IX) technology in a broad range of applications. Proven effective at high flowrates, EDI has in recent years been incorporated in water treatment plants around the world, ...


    By Agape Water Solutions, Inc.

  • Challenge #2 - Manufacturing, General Industry

    A small industrial entrepreneurial company on the East Coast was considering using high purity water in the production of their high quality product. They were concerned the ‘larger’ water companies would not give the project the attention it deserved, and that the system may cost too much. They came to Applied Water Solutions, Inc. for the solution. Solution AWS met with the client and ...

  • Spiral wound EDI technology part 1

    Water purification by reducing the concentration of ionic impurities has been an area of considerable technical interest. Water treatment technologies have rapidly advanced in recent years to where a myriad of options have been developed for this purpose. The most well-known processes include electrodialysis, electrodeionization (EDI), liquid chromatography, membrane filtration, and ion exchange. ...


    By Agape Water Solutions, Inc.

  • Case Study - Power Industry

    Electrodeionization Evaluation Programsm (EEP)Applied Water Solutions was contacted by a client who owned the largest EDI System in operation today. They faced numerous challenges including a decline in system performance. Having over 20 years of experience with EDI we understand all the parameters that effect EDI performance, and were able to provide the client with objective recommendations to ...

  • Comparison of plate and frame and spiral wound EDI Part 2

    Part 1 of this series compared spiral-wound electrodeionization(EDI) with more traditional plate-and-frame EDI. The plate-and-frame design is similar in construction to a plate heat exchanger with multiple fluid chambers sandwiched between a set of endplates (and electrodes). Within there are a series of cation and anion ion-exchange (IX) membranes. The spiral-wound design uses a pressure vessel ...


    By Agape Water Solutions, Inc.

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