High-Purity Water & Separation Membrane Equipment
Explore our foundational equipment skids configured for degassing, sub-micron demineralization, and zero-discharge industrial water processing.
The Paradigm Shift in High-Purity Water: Continuous Electrodeionization (CEDI)
In modern high-technology manufacturing, demineralized water is no longer merely filtered water; it is a critical process chemical. Traditional demineralization methodologies—predominantly chemical-regenerated mixed-bed ion exchangers (IX)—are rapidly being phased out worldwide due to acid/alkali consumption, severe hazardous waste disposal liabilities, intermittent batch cycling, and erratic effluent conductivity profiles.
Continuous Electrochemical Regeneration
Continuous Electrodeionization (EDI/CEDI) synthesizes ion-exchange resins and selective ion-exchange membranes within an applied direct current (DC) electric field. The potential difference drives anions and cations across selective barriers while concurrently dissociating water molecules into hydronium (H+) and hydroxyl (OH-) ions.
- Eliminates hazardous hydrochloric acid (HCl) and sodium hydroxide (NaOH) storage.
- Guarantees steady-state equilibrium without regeneration downtime.
- Yields uninterrupted delivery of ultra-pure effluent with constant ionic profiles.
Advanced OEM/ODM Skid Architecture
Shanghai Tongjie Environmental Protection Technology Co., Ltd. (est. 2010) engineers industrial-grade EDI modules with integrated DPRO (Double Pass Reverse Osmosis) systems. As a National High-Tech Enterprise holding 38+ utility and invention patents, we configure plug-and-play skids designed for grueling commercial parameters.
- Structural skid frames fabricated from pickled and passivated 304/316L stainless steel.
- Sanitary orbital welding with borescopic inspection for high-purity piping.
- Integrated Siemens/Allen-Bradley PLC control with remote SCADA telemetry.
Targeted Weak Electrolyte Removal
Standard demineralization systems often fail when eliminating weakly ionized species such as reactive silica (SiO2), boron, and dissolved carbon dioxide. Tongjie EDI stacks leverage optimized ion concentration polarization layers to selectively strip non-conductive contaminants.
- Boron reduction down to < 5 parts-per-trillion (ppt) for sub-micron semiconductor nodes.
- Silica slip maintained below 5 ppb to protect super-critical turbine blades.
- Coupled with membrane contactor degassing systems for 99.9% CO2 removal.
Macro Industry Solutions & Process Integration
Across North America, Europe, East Asia, and the Middle East, high-purity demineralized water is integral to clean energy transitions, micro-electronics reshoring, and biopharmaceutical synthesis. Tongjie designs application-specific process trains that resolve systemic water scarcity and strict compliance hurdles.
Semiconductor & Wafer Fabrication
Sub-nanometer fabrication requires ultrapure water (UPW) reaching theoretical purity limits (18.2 MΩ·cm resistivity at 25°C), zero particulate presence (>0.05 μm), and TOC levels below 1 ppb. Tongjie's integrated ODM solutions employ dual-pass RO, vacuum/gas-permeable deoxygenation contactor membranes, continuous EDI polishing, and 185nm TOC-destruction UV reactors.
Power Generation & Supercritical Boilers
Thermal, nuclear, and combined-cycle gas turbine (CCGT) power plants demand high boiler feedwater purity to prevent tube scaling, turbine blade stress corrosion cracking, and thermal efficiency losses. Tongjie's EDI demineralization skids eliminate silica volatility and sodium slippage, ensuring compliance with EPRI (Electric Power Research Institute) and VGB guidelines.
Biopharma & cGMP Purified Water (PW/WFI)
Pharmaceutical formulation facilities rely on continuous validation adhering to USP <645> (Water Conductivity), USP <643> (TOC), and European Pharmacopoeia (Ph. Eur.) monographs. Our pharmaceutical EDI skids feature hot-water sanitization (85°C), sanitary tri-clamp fittings, fully drainable 316L membrane housings, and audit-ready data tracking systems.
Green Hydrogen Electrolyzers (PEM & Alkaline)
Proton Exchange Membrane (PEM) electrolyzers require exceptionally pure demineralized feed water to prevent catalyst poisoning (platinum/iridium degradation) and membrane degradation. Tongjie engineers modular, containerized EDI plants supplying high-resistivity, low-halide water directly to gigawatt-scale hydrogen generation hubs in arid or coastal sectors.
Engineering Comparison: EDI vs. Conventional Mixed-Bed (IX)
A rigorous techno-economic analysis demonstrating why multinational engineering, procurement, and construction (EPC) firms specify Tongjie ODM EDI configurations over legacy chemical mixed beds.
| Performance Indicator | Conventional Mixed Bed (IX) | Tongjie DPRO + EDI System | Strategic Advantage |
|---|---|---|---|
| Regeneration Method | Chemical batch (Concentrated HCl & NaOH) | Continuous Electrochemical (DC Field) | Zero hazardous acid/alkali storage; no chemical exposure hazards. |
| Effluent Resistivity Stability | Fluctuates over exhaustion cycle (1-18 MΩ·cm) | Constant 16.0 – 18.2 MΩ·cm | Eliminates batch variation; protects continuous production lines. |
| Reactive Silica (SiO2) Slip | Spikes rapidly prior to bed regeneration (>50 ppb) | Predictable < 5 – 10 ppb | Essential for super-critical boilers and sub-micron fabrication. |
| Operating Expense (OPEX) | High: chemical procurement, neutralizers, labor | Ultra-Low: electricity only (~0.1-0.2 kWh/m³) | Reduces long-term OPEX by up to 68% over 5-year operating window. |
| Physical Footprint | Large: redundant columns, chemical tanks, piping | Compact modular skid / Containerized | Reduces structural plant footprint by 55%, lowering civil costs. |
| Environmental & ESG Impact | High salinity neutral wastewater discharge | Zero chemical wastewater (95% system recovery) | Enables ZLD integration and strengthens corporate ESG credentials. |
Proprietary EDI Stack Design & Hydraulic Efficiency
Tongjie’s proprietary EDI modules integrate thick-cell and thin-cell hybrid ion-exchange compartments layered with specialized cross-linked monosphere resin beds. This geometry maintains balanced flow distribution, prevents preferential channeling, and curtails localized electrical resistance. The result is a robust 35% reduction in power consumption compared to conventional plate-and-frame architectures, while maintaining peak performance in feed conditions with hardness levels up to 1.0 ppm (as CaCO3) and silica up to 0.5 ppm.
Localized Support, International Compliance & Factory FAT/SAT
When deploying ultra-pure water systems globally, cross-border compliance, localized electrical ratings, and rigorous documentation are essential. Shanghai Tongjie delivers end-to-end assurance through structured engineering gates.
Full CE, ASME & cGMP Qualification
Every Tongjie demineralized water skid complies with international standards. We fabricate pressure vessels to ASME Section VIII / PED 2014/68/EU standards, design control cabinets to CE and UL 508A specifications, and produce complete pharmaceutical validation packages following GAMP 5 methodologies (DQ, IQ, OQ, PQ).
Factory Acceptance Testing (FAT) Protocol
Prior to Shanghai dispatch, all systems undergo rigorous Factory Acceptance Testing under simulated operating conditions. Our testing floor executes hydrostatic pressure testing, helium leak detection, electrical continuity/dielectric checks, PLC logic simulation, and water analytical verification to ensure fast on-site commissioning.
Global Field Service & SCADA Cloud
Our engineering support extends worldwide with localized installation direction, virtual commissioning, and automated cloud SCADA integration. Tongjie’s embedded IoT telemetry tracks stack voltage-to-current ratios, differential pressures, and flow dynamics in real time, alerting maintenance crews before scale deposition or performance drift occurs.
Technology Roadmap: Next-Gen Demineralization Architectures
Tongjie’s Shanghai R&D center is pioneering advanced electrochemical separation technologies, driving energy efficiency and recovery rates higher across global industrial sectors.
AI-Powered Adaptive Voltage Tuning
Integrating real-time conductivity and temperature sensors with closed-loop neural algorithms to modulate rectifier DC outputs dynamically. This minimizes electrical resistance during low-ionic flux cycles, lowers kilowatt-hour consumption by 18%, and prevents premature membrane scaling.
Bipolar Membrane Electrodialysis (BMED)
Expanding the boundary of demineralization into resource recovery. By pairing EDI stacks with proprietary bipolar membranes, our advanced systems can split high-salinity reject streams into clean hydrochloric acid and sodium hydroxide, turning waste streams into process chemicals.
Hot-Water Sanitizable High-Temp Modules
Engineered for sterile biopharma and semiconductor wash applications, Tongjie’s next-generation polymer housing materials allow continuous operational fluid temperatures up to 85°C without warping, seal relaxation, or resin functional group degradation.
Frequently Asked Questions on ODM EDI Demineralized Water Systems
Technical clarity for procurement leads, EPC engineering directors, and plant managers specifying high-purity water assets.
Advanced Concentration, High-Pressure Membranes & ZLD Equipment
Complementary high-recovery membrane systems, DTRO/STRO modules, and fracturing flowback treatment skids engineered by Tongjie.
