The Electrodeionization (EDI) process, invented over 20 years ago, is a continuous, chemical-free method that removes ionized and ionizable impurities from the feed water. EDI is most commonly used to treat Reverse Osmosis (RO); permeate and replace Mixed Bed (MB) ion exchange; producing high purity water of up to 18 M O.cm. EDI eliminates the need to store and handle hazardous chemicals required for resin regeneration and the associated neutralization steps.
QUA's Fractional Electrodeionization (FEDI) process is an advancement of EDI and was developed by taking into account the limitations of conventional EDI. FEDI has been in the market for over five years now and has been installed in power stations, refineries, and more. Many of these FEDI systems supplied are some of the largest installed systems in the world.
The patented dual voltage process allows for a higher flexibility and tolerance to inlet water conditions, thus lowering the risk of scaling, and improving the plant's design economics and reliability. FEDI products are supported with CE conformity certificates.
The Basket Strainer is available in various materials with a jacket suitable for the pressures & temperature.
Advantages to FEDI:
| MB | EDI | FEDI ® | |
| Capable of generating ultra-pure water without having to discharge chemical laden regeneration waste streams | X | ? | ? |
| Treated Water Quality Improvements Produces from 1 M.W.cm high purity water to 18M.W.cm ultra-pure water with very low levels of silica & boron |
? | ? | ? |
| Ease of operation | X | ? | ? |
| Flexibility to handle feed condition variations due to dual voltage operation | N/A | X | ? |
| Higher feed hardness tolerance, thus avoiding or eliminating module scaling | N/A | X | ? |
| Effective and efficient removal of weakly and strongly ionized impurities | N/A | X | ? |
| Optimum power consumption | N/A | X | ? |
