Pre-Engineered Equipment
Standardized SWRO & Ultrapure Water Core Lineup
Explore our export-certified modular desalination plants, electronic ultrapure water systems, and industrial membrane modules engineered for high durability under harsh hypersaline conditions.
Macro Dynamics
Global Desalination Evolution: Decarbonization, Energy Recovery, and Modularization
Global baseline water stress, stringent environmental regulations on brine discharge, and energy volatility are reshaping procurement criteria for municipal water boards, mining sites, and petrochemical complexes.
Next-Gen Energy Recovery (ERDs)
Modern SWRO architectures focus aggressively on specific energy consumption (SEC). By integrating state-of-the-art isobaric Energy Recovery Devices (such as pressure exchangers), energy consumption has plunged from over 8.0 kWh/m³ in thermal multi-stage flash (MSF) systems to below 2.8–3.2 kWh/m³ in high-efficiency reverse osmosis trains.
- Net energy capture rates reaching up to 98% efficiency
- Variable Frequency Drive (VFD) integration for fluctuating feed salinity
Containerized Plug-and-Play Footprints
Civil engineering delays and remote-site labor scarcity have elevated demand for containerized SWRO units. Prefabricated inside ISO shipping containers (20ft and 40ft High Cube), these systems bypass months of local construction, offering pre-plumbed, pre-wired, and fully FAT-verified operational readiness.
- Insulated, climate-controlled anti-corrosion container enclosures
- Commissioning completed in days instead of months
Advanced Anti-Fouling Membranes
Biofouling and scaling remain primary causes of membrane degradation. Next-generation thin-film nanocomposite (TFN) polyamide membranes and Disc Tube RO (DTRO) modules allow higher flux rates, broad pH tolerance during CIP cycles, and superior rejection rates for challenging ions like Boron (>93%).
- TDS operational range spanning 35,000 to 45,000 ppm
- High recovery ratios coupled with reduced chemical CIP frequency
Manufacturing Resilience
China Factory 4.0: Cost Velocity, Materials Integrity, and QA Governance
Procuring seawater desalination and ultra-pure water systems from Shanghai Tongjie translates to leveraging an advanced industrial ecosystem where metallurgical expertise, digital manufacturing, and rigorous quality systems intersect.
Metallurgical Superiority in Hypersaline Environs
Seawater corrosion requires uncompromising structural metallurgy. Tongjie enforces strict procurement and fabrication standards for high-pressure fluid headers, manifolds, and high-pressure skids:
- Super Duplex Stainless Steel (2507 / UNS S32750): Employed in all high-pressure circuits (70–85 bar), offering pitting resistance equivalent numbers (PREN > 42) to completely eliminate crevice corrosion.
- Duplex SS 2205 & High-Grade Non-Metallic Lines: Utilized in intermediate pressure lines; SCH80 PVC/PVDF/FRP in low-pressure feed and distribution networks.
- Automated Orbital TIG Welding: Back-gas purged automated welding with 100% radiographic and hydrostatic pressure verification up to 1.5x design pressure.
Turnkey Factory Acceptance Testing (FAT) & QA Protocols
We mitigate risks of cross-border overseas installation by moving 90% of technical commissioning checks directly into our Shanghai clean assembly workshops:
- Simulated Full-Flow Wet Testing: Every unit is tested with high-salinity synthesized test water to verify flux rates, permeate conductivity, and ERD pressure transfers.
- PLC/SCADA Cloud Integration: Pre-programmed with Siemens or Allen-Bradley PLCs featuring automated flush cycles, continuous SDI logging, and remote telematics.
- International Certifications: Fully certified against ISO 9001, ISO 14001, ISO 45001, and EU CE Machinery & Pressure Equipment Directives.
17+
Years Engineering Experience
38+
Invention & Utility Patents
99.2%
Salt Rejection Reliability
1000+
Global Installed Projects
Technical Benchmarking
Engineering Comparison: Containerized SWRO vs. Site-Built Desalination Plants
A data-backed evaluation outlining capital expenditure, deployment timelines, and lifecycle operational parameters to guide municipal and industrial engineering decisions.
| Evaluation Parameter | Tongjie Modular Containerized SWRO | Traditional Field-Constructed Plants | Operational Impact & ROI Advantage |
|---|---|---|---|
| Deployment Timeline | 8–12 Weeks (Factory built & pre-tested) | 12–24 Months (Subject to civil delays) | Reduces time-to-first-water by >70%, critical for urgent water security. |
| Footprint & Civil Works | Minimal (Requires only flat concrete slab) | Extensive (Pumping stations, complex buildings) | Cuts civil engineering capex by up to 60%. |
| Specific Energy Consumption | 2.8 – 3.3 kWh/m³ (Isobaric ERD integration) | 3.5 – 4.5 kWh/m³ (Varies with site layout) | Direct reduction of operational power costs over a 15-year lifecycle. |
| Metallurgical Integrity | Super Duplex 2507 / 2205 (Factory controlled welds) | Mixed field welds, variable corrosion risks | Eliminates onsite welding defects, preventing chloride stress cracking. |
| Relocatability & Scalability | 100% Modular; expandable via parallel skids | Fixed permanent asset; difficult to expand | Flexibility for offshore rigs, remote mining sites, and temporary camps. |
Field-Tested Applications
Localized Application Scenarios: Solving Extreme Water Challenges
From hypersaline gulf environments to offshore energy platforms, Tongjie designs tailored pretreatment and membrane trains to guarantee operational uptime under complex feedwater profiles.
Island Resorts & Coastal Municipalities
Providing pristine WHO-grade potable water for tourism retreats, resort archipelagos, and coastal communities lacking municipal supply. Systems include dual-media filtration, automated chlorination, remineralization calcite filters, and ultra-quiet variable-speed pumps designed for tourist zones.
Semiconductor & Electronics Pure Water
Multi-stage treatment pairing seawater or brackish RO permeate with secondary Double-Pass RO and Continuous Electrodeionization (EDI). Generates ultra-pure water with 18.2 MΩ·cm resistivity, low TOC, and ppb-level dissolved oxygen for wafer fabrication and chemical preparation.
Oil & Gas Produced Water & Offshore Rigs
Explosion-proof (ATEX/IECEx compliant) offshore desalination skids engineered to survive high vibration and marine salt spray. Incorporates disc-tube DTRO and deoxygenation modules for boiler feed water, re-injection schemes, and operational platforms in the Arabian Gulf and North Sea.
Procurement & Engineering Q&A
Frequently Asked Questions by Industrial Buyers & EPCs
Transparent technical answers regarding process engineering, membrane longevity, procurement timelines, and OEM customization capabilities.
What specific water quality parameters are required to size a reliable SWRO system?
To provide an accurate mass-balance calculation, P&ID, and membrane projection, we require: raw water Total Dissolved Solids (TDS), conductivity, pH, temperature range (min/max), Silt Density Index (SDI₁₅) or Turbidity, concentration of key scalants (Silica, Calcium, Magnesium, Barium, Strontium), and presence of Iron, Manganese, or residual organics. Where oil or suspended solids are present, our team designs specialized DAF or DTRO pretreatment systems.
How does Shanghai Tongjie achieve low specific energy consumption (SEC)?
We partner with leading global isobaric energy recovery manufacturers (such as Energy Recovery Inc. or Danfoss) and integrate premium high-pressure plunger/multistage centrifugal pumps governed by ABB/Siemens VFDs. The energy in the high-pressure reject brine stream is transferred directly to the incoming feed stream with over 96–98% mechanical efficiency, stabilizing total operating energy at approximately 2.8 to 3.2 kWh/m³.
What materials are used to withstand marine corrosion and chloride attack?
All wetted components exposed to raw seawater at high pressure (>16 bar) are manufactured from 2507 Super Duplex Stainless Steel (UNS S32750 / EN 1.4410) with a PREN > 42. Intermediate and lower salinity reject systems utilize Duplex 2205 (1.4462). Low-pressure piping incorporates heavy-duty Schedule 80 PVC, PVDF, or FRP piping. Structural skid frames undergo hot-dip galvanization followed by a multi-coat marine-grade epoxy polyurethane coating system.
Do you support full OEM/ODM branding and customized engineering for global EPCs?
Yes. Tongjie functions as the tier-1 white-label and OEM manufacturer for numerous global environmental engineering brands. We provide private-label container fabrication, custom HMI interface languages, designated PLC platforms (Siemens TIA Portal, Rockwell Studio 5000), complete bilingual documentation, and factory acceptance test (FAT) video streaming or in-person verification protocols.
What is the expected operating lifespan of the RO membranes and core equipment?
With proper automated chemical dosing (antiscalant, biocide) and periodic Clean-In-Place (CIP) maintenance, high-rejection SWRO membranes have an average operational lifespan of 3 to 5 years. High-pressure pump wet ends and Super Duplex piping manifolds are engineered for a design lifecycle exceeding 15–20 years in continuous service.
Industrial Purification & ZLD
Specialized Desalination, Concentration & Reclaim Equipment
Complete your water treatment chain with our precision-manufactured containerized desalination systems, disc-tube RO modules, and oil & gas fracturing flowback reclaim assemblies.
