Hệ thống khử ion - EDI (Electrodeionization)

Standard Features

No regenerant required for regeneration, EDI does not consume salt and recycle the concentrate in operation, which saves much expense and makes the system much simpler.
Less fouling design, Concentrate and electrolyte stream are flowing into EDI in opposite directions to feed water can avoid fouling effectively. Then it broadens the feed water limit adequately.
Low energy consumption, EDI filled with resin reduces the EDI module resistivity significantly, which reduces the energy consumption largely.
Carbon coated steel frame
Control panel
LCD screen
Liquid filled pressure gauges
Flow meters
Resistivity meter
Factory tested to insured quality
1 Year warranty

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Electrodeionization (EDI)

EDI is a process which combines semi-impermeable membrane technology with ion-exchange media to provide a high efficiency demineralization water up to 18 ΜΩ.

EDI employs electrical current and specially-prepared membranes which are semi permeable to ions based on their charge, electrical current, and ability to reduce the ions based to their charge. Through electro dialysis an electrical potential transports and segregates charged aqueous species. The electrical current is used to continuously regenerate the resin, eliminating the need for periodical regeneration.

The EDI process produces industrial process water of very high purity, using less than 95% of the chemical products used in the conventional ion exchange processes.

With EDI system membranes and electricity replace the million gallons of acid and caustic chemicals that the old processes required daily.

EDI Module

An EDI Module consists of a series of thin chambers that alternately contain mixed bed resin for water purification and a concentrate water flow to carry away impurities. Ionspecific membranes, cationic on one side and anionic on the other, separate the chambers.

A cationic-specific membrane will only allow positively charged ions to pass, while blocking the passage of negatively charge ions. An anionic-specific membrane does just the reverse. Neither membrane will allow water to pass.

High voltage DC Electrodes are located on either side of the sandwiched resin/concentrate chambers. There can be from 4 to 100 resin chambers in an EDI cell, depending on the manufacturer.

As water begins to flow through the cell, the charged ions in the water in a resin chamber are captured by the ion exchange resin. When a voltage is applied (200-400 VDC) across the cell, the captured cationic (+) and anionic (-) impurities begin to migrate across the resin bed in the direction of the appropriate electrode. The ions them pass through the ion-specific membranes into the concentrate chamber. The ions are kept in the concentrate chamber by the reverse charged membrane on the adjacent resin chamber, thus trapping them in the concentrate stream.

Applications