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Wholesale China Industrial Demineralized Water Equipment Factory - RO + EDI Suppliers for High-Quality Water Solutions Factory, Manufacturer
Product Description
Product Overview and Positioning
The industrial demineralized water equipment manufactured by Shanghai Tongjie Environmental Protection Technology Co., Ltd. adopts a combined process of "Pretreatment + Reverse Osmosis (RO) + Mixed Bed (MB) or Electrodeionization (EDI)" to perform deep demineralization of raw water, producing demineralized water with conductivity below 0.1 μS/cm.
The equipment operates on the principles of ion exchange and membrane separation, without the need for a heat source. The produced water quality meets the low salt content requirements of various industrial applications such as high-pressure boilers, electronics cleaning, and pharmaceutical preparation.
Process Flow and Principle
💧 RO Unit Process
Raw water first passes through the pretreatment unit to remove suspended solids, residual chlorine, and some organic matter, then enters the Reverse Osmosis (RO) unit. The RO membrane is a polyamide composite membrane that, under an operating pressure of 1.0–1.8 MPa, removes more than 97% of dissolved salts, colloids, and microorganisms. The conductivity of the RO permeate is typically reduced to below 50 μS/cm.
⚡ Deep Demineralization (MB or EDI)
Depending on water quality requirements, the RO permeate enters a Mixed Bed (MB) or Electrodeionization (EDI) system. The mixed bed process uses cation and anion exchange resins to produce water with resistivity up to 18 MΩ·cm. The EDI process utilizes ion exchange membranes and continuous electrical regeneration to produce water with resistivity consistently above 17 MΩ·cm without chemical regeneration agents.
Equipment Structure and Core Components
- Pretreatment Filters: Multimedia and activated carbon filters for solids and chlorine removal.
- RO Membrane Modules: Spiral-wound brackish water membranes in FRP or stainless steel vessels.
- Deep Demineralization: Mixed bed units with resin traps or EDI modules with plate-and-frame structures.
- Control System: PLC control cabinet for automatic operation and online conductivity monitoring.
- Support Systems: Integrated chemical dosing and cleaning systems.
Key Performance Indicators
Typical control parameters based on industry standards (GB/T 12145):
- Product Water Conductivity: MB < 0.1 μS/cm; EDI < 0.06 μS/cm.
- Product Water Resistivity: MB ≥ 18 MΩ·cm; EDI ≥ 17 MΩ·cm.
- Silica Content: Controlled at ≤ 20 μg/L.
- Hardness: Zero scale formation guaranteed for downstream equipment.
Application Fields
This equipment is widely utilized across multiple sectors:
- Power Industry: High-pressure boiler makeup water.
- Electronics: Pretreatment for ultrapure water systems.
- Pharmaceutical: Purified water and water for injection.
- Chemical Industry: Process ingredients and reaction media.
- Food & Beverage: High-quality production water.
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Water Reuse Equipment (UF+RO)
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Frequently Asked Questions
What is the typical water quality produced by this equipment?
The equipment produces high-purity demineralized water. Depending on the configuration, Mixed Bed (MB) systems reach conductivity below 0.1 μS/cm, while Electrodeionization (EDI) systems can achieve below 0.06 μS/cm.
What is the difference between Mixed Bed (MB) and EDI?
Mixed Bed uses a resin mixture that requires periodic chemical regeneration with acid and alkali. EDI uses an electrical field for continuous resin regeneration, eliminating the need for chemicals and providing a more stable water quality.
Does the system require a heat source to operate?
No. The equipment operates based on ion exchange and membrane separation principles at ambient temperatures, making it energy-efficient without the need for an external heat source.
Can this equipment be used for high-pressure boiler makeup water?
Yes. The product water meets the GB/T 12145 quality standards for thermal power plants, with resistivity reaching up to 18 MΩ·cm and silica content below 20 μg/L, ideal for high-pressure boilers.
How is the equipment controlled?
The system is integrated with a PLC control cabinet that enables fully automatic operation, including online conductivity monitoring, sequence control for regeneration, and fault alarms.
Is the equipment customizable for specific raw water conditions?
Absolutely. We develop a targeted indicator plan based on your raw water analysis report and downstream process requirements to ensure optimal performance and guaranteed water quality.
