EDI System in Water Treatment

ELECTRODEIONIZATION SYSTEMS

EDI System In Water Treatment

Electrodeionization works in applying functional currents to eradicate ionized substances from water bodies, while simultaneously regrowing the ion exchange media. An EDI water system is usually applied after the usage of a reverse osmosis system or even a double pass ro system.

EDI water treatment helps to guarantee that every part of the system will perform perfectly together. What results is an extremely purified solution that meets all of your requirements.

Electrodeionization(EDI) system features:

Reduced chemical use
Lower capital costs
Compact design (saves space)
Environmentally friendly
Minimal maintenance
Very consistent operation

EDI SYSTEM

Flow rate : 0.5 to 50 M3/hr
No chemical regeneration
Lower conductivity = higher EDI quality
Lower CO2 = higher silica removal
ppb-level contaminants means infrequent EDI cleaning
Higher rated flows for EDI

Aquatech plus has over 15+ years of experience as a global supplier in producing electrodeionization systems for greater purity and support across many industries with cutting-edge solutions in water treatment. Reliability, high quality, and no need for chemical regeneration make our EDI systems extremely desirable in the market.

EDI systems remove ionized and ionizable species from water using electrically active media and electrical potential (DC power) to affect ion transport. By using this type of purification technology, caustic and acidic types of chemicals are not required. The water which has been treated by RO-EDI has typically exceeded customer’s high-purity standards.
Electrodeionization system is a continuous electro-chemical process of water deionization where ion specific membranes, mixed bed resin and a DC voltage across them, replace the standard hazardous acid-caustic chemical regeneration process.
In the latest technology of EDI, modules must be pretreated with RO for many reasons. However, what are the advantages and disadvantages of softening and 1-pass and 2-pass RO as pretreatment?

Many EDI water systems in water treatment using Pure Aqua EDI technology perform very well with 1-pass RO. It is easy to achieve 17+ Megaohm with 1-pass RO. Most USP WFI and purified water systems easily meet requirements with 1-pass RO. As a basic knowledge in the water treatment industry, softening with 1-pass RO system is less expensive and less complex than a 2-pass RO system.
Single pass RO system can be enhanced using membrane degasser for even better EDI performance. Membrane degasser can reduce the CO2 which enhances EDI performance, reduces scaling potential, and helps SiO2 removal by the EDI machine.

In summary, EDI water systems have many options:

Softener followed by RO followed by EDI modules
Softener followed by RO followed by membrane degasser followed by EDI modules
RO followed by caustic dosing followed by RO followed by EDI modules

It is difficult to meet the feed specification to the EDI water treatment plants without pH adjustment and/or membrane degasser. Decreasing the CO2 before the electrodeionization system will decrease the load (lower amps) and improve the product quality. Pure Aqua installed a membrane degasser on many EDI skids for CO2 removal/reduction. The membrane degasser replaced the proposed design of a conventional forced air degasser (tower). It was more cost efficient, compact and decreases installation time.

What is Electrodeionization?

The cartridge filter housing is generally utilized for cleaning or polishing in any type of process industry. Cartridge filter housing works by evenly distributing unfiltered water around the cartridges, from the outside to the inside. Suspended solids are captured from the outside for easy expulsion, and the filtered water exits through the outlet pipe.

How does electrodeionization work?

Electrodeionization is designed to polish the permeate once the water has already went through a water treatment system, such as reverse osmosis. This system utilizes low energy consumption and disposes of the need for costly and unsafe chemicals used in conventional ion exchange water filters. Such factors make operation expenses much lower, and helps water treatment companies meet their environmental protection quotas.

ELECTRODEIONIZATION SYSTEMS