High-Performance Separation & Purified Water Platforms
Explore standard and customizable skid-mounted modular systems engineered for complex continuous treatment duties.
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Explore PlatformUltrapure Water (UPW) System Design: Purity at the Molecular Boundary
A comprehensive examination of unit operations, multi-stage barrier rejection, and chemical-free polishing dynamics.
The Physics of Sub-ppb Impurity Separation
Ultrapure Water (UPW) engineering transcends conventional filtration. In microelectronics (wafer rinsing) and parenteral pharmaceutical production (Water for Injection - WFI), contaminants must be quantified not in milligrams, but in parts per billion (ppb) or parts per trillion (ppt). Achieving an electrical resistivity approaching the theoretical maximum of 18.2 MΩ·cm at 25°C demands absolute control over dissolved inorganic ions, total oxidizable carbon (TOC), reactive silica, dissolved oxygen (DO), and colloidal particles down to ≤0.05 μm.
Modern ODM manufacturing protocols mandate a multi-stage, synergistic separation philosophy. Raw surface or borehole water initially enters hydraulic multimedia and catalytic adsorption matrices to suppress Silt Density Index (SDI&sub1;&sub5; < 3). Downstream primary demineralization combines high-rejection thin-film composite polyamide (TFC-PA) reverse osmosis with Continuous Electrodeionization (CEDI). By applying an electrical potential across selective ion-exchange membranes, CEDI continuously strips ionic species while regenerating resin beds with in-situ water splitting, eliminating the secondary contamination risks and hazardous effluents inherent to conventional acid/caustic regenerations.
For sub-10nm semiconductor device manufacturing, secondary polishing trains integrate vacuum or nitrogen membrane contactors for physical degassing (achieving DO < 1 ppb), 185 nm TOC destruction ultraviolet reactors that produce hydroxyl free radicals, and non-regenerable nuclear-grade mixed-bed polishers.
Key Performance Parameters
- Resistivity: 18.0 - 18.2 MΩ·cm
- TOC Content: < 1 - 3 ppb
- Dissolved O&sub2;: < 1 - 5 ppb
- Reactive Silica: < 0.5 ppb
- Particles (>0.05μm): < 1 count/mL
- Bacteria (CFU): < 1 CFU/1000mL
| Treatment Phase | Primary Technology | Target Species | Operational Criticality |
|---|---|---|---|
| Pre-Conditioning | Multi-Media + UF + Antiscalant Dosing | Colloids, suspended solids, particulates | SDI < 3; protects primary RO against organic and particulate fouling |
| Primary Desalting | Double-Pass Reverse Osmosis (DPRO) | 99.5% polyvalent & monovalent ions | Electrical conductivity reduced to < 2 μS/cm; minimizes thermal loading |
| Deoxygenation / Degas | Gas-Permeable Hydrophobic Hollow Fiber | Dissolved CO&sub2;, O&sub2;, volatile VOCs | Pre-CEDI CO&sub2; reduction extends resin ion-exchange capacity; prevents oxidation |
| Continuous Polishing | Continuous Electrodeionization (CEDI) | Trace weakly-ionized ions, boron, silica | Attains > 16-17.5 MΩ·cm without chemical downtime or reagent hazards |
| Sub-ppb Polishing | 185nm UV + Nuclear Mixed Bed + 0.05μm UF | Residual TOC, endo-bacteria, nanoparticles | Secures 18.2 MΩ·cm output for advanced node fabrication |
Specialized Industrial & Localized Use Cases
Engineering customized fluid separation skids mapped to sector-specific purity thresholds and discharge mandates.
Semiconductor & Optoelectronics
Fabrication of microprocessors, photovoltaic solar wafers, and OLED panels requires rinsing water devoid of micro-contaminants. Our skids utilize PVDF piping with zero dead-leg geometry and orbitally welded 316L manifolds, stopping leaching of organic plasticizers and ensuring absolute sub-ppb resistivity balance.
Pharmaceutical & WFI Generation
Compliant with cGMP, USP, and EP pharmacopeias. Our membrane purified water units feature sanitary sanitary clamp connections, automatic thermal sanitization (≥80°C), calibrated TOC analyzers, and 21 CFR Part 11-compliant data acquisition for complete operational auditability.
Supercritical Power & Green H&sub2;
Thermal power boilers and PEM/alkaline water electrolyzers for green hydrogen demand strictly demineralized feed water to suppress corrosion and cell degradation. We package high-recovery RO-EDI trains that deliver consistent low-silica water in harsh field conditions.
High-Salinity ZLD & Brine Recovery
Coupling Disk Tube Reverse Osmosis (DTRO) and Osmosis-Assisted Reverse Osmosis (OARO) allows treatment of hypersaline brine upwards of 120,000 ppm TDS. This decreases thermal evaporator duties and operational energy consumption by over 40%.
Oilfield Produced Water Treatment
Integrating pre-separation oil skimming with robust open-channel STRO/DTRO technology allows reinjection and reuse of fracturing flowback fluids under harsh field environments, maintaining effluent oil ≤ 5 mg/L and suspended solids ≤ 1 mg/L.
Decentralized Coastal Infrastructure
Packaged, containerized seawater reverse osmosis (SWRO) systems tailored for remote islands, commercial resorts, and coastal ports. Pre-tested, skid-housed units allow immediate operation upon coupling to intake and power headers.
Global Dynamics & Membrane Technology Roadmap
Navigating global regulatory pressures, volatile water footprints, and the transition toward next-generation membrane architectures.
The global water treatment landscape faces a critical turning point. Industrial production facilities confront stringent regulatory mandates including the EU Water Framework Directive, US EPA PFAS guidance limits, and Asia's aggressive zero-liquid discharge targets. Water is no longer an expendable utility—it is a closed-loop resource requiring maximum lifecycle retention.
Simultaneously, traditional high-energy thermal desalination and chemical deionization cannot scale sustainably against aggressive corporate decarbonization schedules. The industry is rapidly pivoting toward high-recovery membrane concentration, biomimetic filtration channels, and automated self-optimizing skids driven by industrial AI.
Low-Energy Thin-Film Nanocomposites
Deployment of graphene-doped and metal-organic framework (MOF) polyamide membranes. Achieves a 20% drop in hydraulic resistance while maintaining >99.7% sodium chloride rejection.
Hypersaline OARO & UHPRO Scaling
Maturation of Ultra-High-Pressure Reverse Osmosis (pressures up to 150 bar) and Osmosis-Assisted RO. Pushes membrane concentration boundaries past 140,000 ppm TDS prior to thermal stages.
Predictive AI & Autonomous Fouling Mitigation
Integration of neural-network inference modules on PLC edges. Real-time mass-balance models anticipate boundary layer crystallization and trigger proactive flow reversals.
Biomimetic Aquaporin Systems
Industrialization of functional cellular-channel aquaporin membranes for selective water flux, allowing zero ion slippage with minimal thermodynamic penalty.
China Factory Precision & Global Supply Chain Advantages
Combining integrated precision machining, rapid component sourcing, and stringent Factory Acceptance Testing (FAT).
End-to-End Vertical Control: Concept to Commissioning
Sourcing bespoke ultrapure water and membrane systems globally can introduce logistical handoff delays, fragmented subcontracting, and erratic assembly tolerances. Operating directly from our specialized Shanghai manufacturing base, Shanghai Tongjie resolves these issues by consolidating hydraulic design, structural skid welding, Class II electrical integration, and automated control programming within one roof.
China's manufacturing ecosystem provides immediate access to metallurgy (duplex steel 2205/2507, titanium Grade 2, and high-purity PVDF polymers) alongside high-efficiency precision component manufacturing. Our engineers coordinate every step of system buildout: precision pipe spool orbital welding, 100% helium leak verification, wet functional validation, and automated control burn-in before containerized transport.
Supply Chain Efficiencies
Localized Support & International Compliance Assurance
Backing your water system with cross-border technical field services, digital twin telemetry, and verified documentation.
International Certifications
Our complete systems align with CE machinery and low-voltage directives. Operations strictly conform to ISO 9001, ISO 14001, and ISO 45001. System designs for pharmaceutical applications supply complete DQ, IQ, and OQ validation dossiers to support local drug authority audits.
Field Commissioning & Handover
We deploy senior field service engineers for on-site mechanical anchoring, pipe interconnections, instrument loop checks, and wet commissioning. Comprehensive operator training modules empower local plant teams with deep insight into hydraulic flushing and CIP optimization.
SCADA & Cloud Telemetry
Equipped with secure cellular or fiber gateway connections, our skids interface with distributed control systems (DCS) via standard Modbus/Profibus protocols. Secure cloud dashboards enable Tongjie process specialists to provide remote diagnostics and predictive maintenance support.
Frequently Asked Questions: System Engineering & Procurement
Direct responses to critical inquiries concerning feed metrics, membrane life, and ODM collaboration models.
What critical raw water analysis points are necessary to finalize an Ultrapure Water or ZLD proposal?
How does Tongjie manage Boron and Silica leakage in single/double-pass RO configurations?
What distinguishes CEDI technology from conventional mixed-bed ion-exchange polishers?
What lifecycle lifespan can be projected for membranes under high-salinity and harsh feed operations?
Can Tongjie provide turnkey modular skids under white-label ODM partnerships for engineering firms?
Advanced Separation, Concentration & Water Recovery Skids
Explore additional specialized membrane and high-salinity concentration modules engineered for complex industrial applications.
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Explore PlatformInitiate Your Process Simulation & System Sizing
Provide your feed water quality analysis report and treatment targets. Our engineering specialists will deliver a complete mass balance model, technical process train design, and skid footprint proposal within 48 hours.