EDI Water Treatment

Product Description

The JNDTECH EDI water treatment system is a continuous electrodeionization unit that polishes reverse osmosis permeate into ultrapure water for semiconductor, pharmaceutical and laboratory plants. It regenerates its resin in place with a DC field instead of discarding a mixed-bed charge, so it keeps producing while a conventional ion exchange train would be offline. Product water reaches 18.2 MΩ·cm at 25°C and output runs from 100 to 100,000 L/H.

Core Specifications of the EDI Water Treatment System

Performance Features

An EDI stack is not a filter and not a machine that runs on its own. It is a stack of ion exchange membranes and resin between two electrodes, and it only performs on water that reverse osmosis has already stripped of hardness, carbon dioxide and chlorine.

• Continuous production. A mixed-bed unit has to come off line for regeneration, and the loop drops out of specification while it does. The EDI stack regenerates while it runs.
• No acid or caustic. Regeneration is driven by the DC field, so the plant stores no acid or caustic and has no regeneration wastewater to neutralise.
• Flat water quality. Regeneration is continuous rather than batched, so product resistivity stays level instead of falling away between resin changes.
• Lower running cost. No regenerant bill, no resin replacement schedule and no neutralisation pit.
• Modular capacity. Output is built from stack modules, which is how one range covers 100 to 100,000 L/H.
• Interlocks on leak, water level and over-temperature stop the unit rather than let it run dry or overheat.

Applications of the EDI Water Treatment System

The EDI unit is the last stage of a train that starts with multimedia filtration and activated carbon and passes through reverse osmosis. The upstream stage is not optional: feed the stack with untreated water and hardness and carbon dioxide reach the membranes and it fouls. Plants that need the front end too are usually specified the reverse osmosis water treatment equipment first and the EDI skid after it. A water distiller suits high-salinity feed that membranes handle badly, but it burns heating power, and seawater desalination plus EDI is the coastal alternative.

• Electronics: semiconductor manufacturing, integrated circuit production, wafer and component rinsing
• Pharmaceutical: pharmaceutical grade water, medical device and container cleaning
• Laboratory: chemical analysis, biological experiments, environmental monitoring
• Food and beverage: beverage production, food processing, process water
• Other: fine chemicals, materials science
• Not covered: potable water plants that need nothing beyond filtration, and any project without a reverse osmosis stage upstream

Technical Specifications

Every published figure below is copied from the JNDTECH data for this unit. Rows marked [TO CONFIRM] have not been released by the factory and are left blank rather than estimated.

Standard Configuration and Options

The standard skid arrives ready to connect between the reverse osmosis outlet and the point of use. The second list is quoted separately, so a plant can start with the EDI stage alone and add stations as the loop grows.

Standard configuration

• EDI stack with DC power supply on a stainless steel frame
• Feed pump, pressure gauges and flow meters
• Control cabinet with operator panel
• Leak, water level and over-temperature protection
• Sampling point and product water outlet

Optional configuration

• UV steriliser on the product line
• Terminal ultrafiltration or microfiltration unit
• Ultrapure water storage tank and transfer pump
• PLC and touch screen upgrade with data logging
• Voltage and frequency configured for the destination country

Certifications and After-Sales Service

JNDTECH builds this equipment to CE and ISO 9001 requirements and holds SGS certification. Spare parts and stack modules come from the same factory, so a capacity increase years later does not depend on a third party.

• Warranty: 12 months [TO CONFIRM]
• Installation: on-site installation and commissioning by our engineers
• Training: operator training on your loop during commissioning
• Response: technical reply within 24 hours
• Spares: remote support and spare parts supply for the life of the equipment

Frequently Asked Questions

What water quality does the EDI water treatment system produce?

Up to 18.2 MΩ·cm at 25°C, the resistivity specified for ultrapure water. Actual readings depend on the reverse osmosis permeate feeding the stack.

Can the unit run directly on tap water or well water?

No. EDI is a polishing stage and needs reverse osmosis permeate upstream. Without it the stack fouls with hardness and carbon dioxide, which is not covered by warranty.

Does the system need acid or caustic regeneration?

No. The DC field regenerates the resin continuously while the unit produces water, so the plant stores no acid or caustic.

Can the voltage be adjusted for our country?

The standard rating is AC 220V, 380V or 415V ±5% at 50Hz or 60Hz. Other voltages can be arranged on request.

What is the delivery lead time?

[TO CONFIRM] weeks after deposit, confirmed with the quotation.

Do you provide installation and training?

Yes. Our engineers install and commission the unit on site and train your operators before handover.

Get an EDI Water Treatment System Quote

Send us the resistivity you need, the flow rate in L/H, a feed water analysis and whether a reverse osmosis stage already exists on site, and we will confirm the stack configuration and the pretreatment it requires. Quote and P&ID return within 24 hours.

Get a Quote　|　WhatsApp: +86-13823281855