High-Efficiency Membrane & Desalination Equipment
Pre-engineered skids, factory-tested containerized plants, and heavy-duty high-salinity volume reduction packages ready for global deployment.
Macro Industry Landscape: The Global Evolution of SWRO Desalination
From centralized megaplants to modular decentralized infrastructure, the global seawater reverse osmosis (SWRO) market has entered a transformative era driven by energy optimization, strict environmental compliance, and decarbonization mandates.
Historical thermal desalination (MSF/MED) demanded upwards of 10 to 15 kWh/m³ equivalent. Modern SWRO system engineering, pioneered by tier-1 manufacturers, operates near the thermodynamic boundary—yielding Specific Energy Consumption (SEC) ratings between 2.5 and 3.2 kWh/m³ through isobaric energy recovery devices (ERD) with >97% pressure transfer efficiency.
Global EPC contractors are shifting away from on-site civil megaprojects that require 3–5 year construction schedules. Turnkey containerized and skid-mounted SWRO units engineered in factory environments compress project lead times to less than 120 days, offering plug-and-play capability, verified hydraulic testing, and predictable operational footprints.
Stricter coastal ecosystem protections across the Mediterranean, Persian Gulf, and Red Sea require stringent diffuser modeling and reduced chemical outfall. High-recovery SWRO configurations coupled with secondary disc-tube reverse osmosis (DTRO) or brine crystallization achieve zero liquid discharge (ZLD) paradigms, recovering valuable minerals while reducing environmental impact.
Integrated R&D, Heavy Fabrication & Direct Factory Execution
Shanghai Tongjie Environmental Protection Technology Co., Ltd. (established in 2010) brings together process chemistry, high-pressure piping craftsmanship, automation engineering, and rigorous FAT protocols under one certified industrial roof.
Holding official National High-Tech Enterprise status and designated as a Shanghai "Specialized and Sophisticated" Industrial Enterprise, our manufacturing workshops adhere strictly to international quality frameworks. Our facility holds certified ISO 9001:2015 Quality Management, ISO 14001:2015 Environmental Management, and ISO 45001:2018 Occupational Health and Safety certifications. Furthermore, all pressure vessels and electrical assemblies conform to European Union CE Directives (Pressure Equipment Directive 2014/68/EU and Low Voltage Directive 2014/35/EU).
Our contracting credentials include Class II General Contracting in Environmental Protection Engineering and Class II Mechanical & Electrical Equipment Installation, authorizing our field teams to manage turnkey municipal and heavy industrial installations worldwide.
With over 38 authorized invention and utility model patents alongside proprietary software copyrights, our R&D division continuously refines hydraulic flux balancing, anti-scaling flow distributors, and membrane deoxygenation arrays.
To overcome pitting corrosion in hyper-saline maritime conditions (chloride concentrations exceeding 25,000 mg/L), our factory maintains specialized fabrication suites for Super Duplex Stainless Steel (UNS S32750 / 2507), Duplex 2205, and Titanium Grade 2 high-pressure piping. Every automated orbital weld undergoes radiographic (RT) or dye penetrant inspection (PT) to guarantee 100% structural integrity under operating pressures reaching 8.5 MPa (85 bar).
Localized Application Scenarios: Engineered for Extreme Environments
Every marine and industrial intake presents distinct biological, thermal, and osmotic challenges. Our ODM systems are architected to deliver reliable service across diverse operational fronts.
Challenge: Variable seasonal occupancy, severe space limitations, acoustic restrictions (<65 dB at 1m), and unreliable electrical grids.
Solution: Super-insulated containerized SWRO units equipped with high-efficiency isobaric ERDs, low-noise VFD-driven positive displacement or multistage centrifugal pumps, remineralization (calcite/dolomite beds), and secondary disinfection.
Challenge: Space/weight constraints, dynamic ship motions (pitch and roll), corrosive salt-fog atmospheres, and explosive ATEX zones.
Solution: Class-approved skid packages (ABS/DNV standards compliant), explosion-proof electrical cabinets, 316L/Duplex skid frames, and continuous oil-in-water intake monitoring to prevent hydrocarbon fouling.
Challenge: Demanding feedwater requirements for ultra-pure boiler feed and PEM electrolyzers, requiring silica <5 ppb and conductivity <0.06 µS/cm.
Solution: Two-pass SWRO + BWRO configurations paired with membrane contactor deoxygenation (eliminating dissolved O₂ down to <1 ppb) and continuous electrodeionization (EDI) polishing skids.
Challenge: Complex salinity (TDS > 60,000 mg/L), free/emulsified oil, heavy hydrocarbons, scaling ions (Ba, Sr), and fracturing additives.
Solution: Integrated chemical softening and coalescing separation coupled with open-channel Disc Tube Reverse Osmosis (DTRO). Operates up to 120 bar to achieve reinjection water quality with oil content ≤5 mg/L.
Challenge: Intermittent power feed, pressure fluctuations, and potential membrane compaction or backpressure damage during rapid solar drops.
Solution: Dynamically adaptive variable-frequency algorithms coordinating high-pressure pump ramping with actuated pressure relief valves, buffer storage, and automated freshwater flushing sequences.
Challenge: Immediate deployment demands following natural disasters or during new infrastructure construction in arid coastal zones.
Solution: Fully road-transportable 20ft and 40ft ISO shipping containers featuring built-in raw water intakes, media/UF pretreatment, RO modules, clean-in-place (CIP) tanks, and diesel/solar tie-in points.
Comprehensive Technical Architecture: Standard SWRO Configurations
Process trains designed against real raw water analyses. Below is the structural envelope engineered across our standard modular series.
| System Capacity | Feed TDS Envelope | High Pressure Metallurgy | Energy Recovery Type | Specific Energy (SEC) | Control Architecture |
|---|---|---|---|---|---|
| 50 – 250 m³/day (Skid/20ft) | Up to 42,000 mg/L | Duplex 2205 / 316L SS | Hydraulic Turbocharger | 3.2 – 3.8 kWh/m³ | Siemens S7-1200 / 7" HMI |
| 500 – 1,500 m³/day (40ft HQ) | Up to 45,000 mg/L | Super Duplex 2507 | Isobaric Rotary Chamber | 2.7 – 3.1 kWh/m³ | Siemens S7-1500 / 12" HMI |
| 2,000 – 5,000 m³/day (Multi-train) | Up to 50,000 mg/L | Super Duplex 2507 / SMO 254 | Dual Isobaric PX Array | 2.4 – 2.8 kWh/m³ | DCS Integration / SCADA / IoT |
| DTRO Hyper-Brine Series | 60,000 – 120,000 mg/L | Titanium Gr. 2 / Hastelloy C | High-Pressure Booster Rail | Process Dependent | Fail-Safe Instrumented PLC |
Localization Support, Global Standards & Quality Engineering
Deploying critical desalination infrastructure overseas demands strict adherence to regional electrical, piping, and environmental safety protocols.
Fabrication and hydro-testing comply with ASME Boiler and Pressure Vessel Code (Section VIII & B31.3) alongside European EN 13480 metallic industrial piping codes.
VFDs, motors, and transformer packages engineered for 380V/50Hz, 440V/60Hz, or 480V/60Hz. Switchgear builds accommodate IEC 61439 or UL 508A / NEMA 4X standards.
Permeate remineralization and post-treatment stages consistently fulfill the WHO Guidelines for Drinking-water Quality, GCC Standardization Organization (GSO), and US EPA limits.
Every train undergoes 100% full-load hydraulic Factory Acceptance Testing (FAT) with simulated saline water in our Shanghai yard prior to container seal and shipping.
R&D Technology Roadmap: Towards Zero-Emissions SWRO
Continuous investment in advanced membrane architecture, artificial intelligence, and ultra-high-pressure thermodynamics shapes our product engineering pipeline.
Standard SWRO membranes operate up to 83 bar (~1,200 psi). Our next-generation DTRO and reinforced spiral modules reach 120 to 150 bar, concentrating seawater brine up to 130,000 mg/L TDS. This shrinks downstream thermal evaporation loads by over 60%, drastically cutting capital costs for Zero Liquid Discharge facilities.
Collaborating with leading material science institutes, we are validating nanocomposite thin-film membranes infused with aquaporin proteins and graphene-oxide nanosheets. Preliminary testing shows up to 35% higher water permeability at equivalent salt rejection, driving specific energy consumption below 2.0 kWh/m³.
Integrating machine learning algorithms directly into PLC controllers to track temperature-normalized permeability, osmotic pressure gradients, and differential pressure variations in real time. The platform forecasts organic and inorganic fouling 7 to 14 days in advance, scheduling automated CIP cycles to protect membranes.
Engineering & Procurement FAQ for EPC Contractors
Detailed technical, commercial, and operational answers addressing the core questions of international procurement teams.
What parameters are essential to size an industrial or municipal SWRO plant?
How does Shanghai Tongjie protect SWRO equipment against severe chloride corrosion?
What energy recovery technology is integrated, and what is the typical SEC?
How fast can a containerized SWRO system be deployed and operational on-site?
Can your systems treat high-salinity oilfield produced water or fracturing flowback?
What private-label OEM/ODM services do you provide for distributors and EPC contractors?
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Request an Engineered Process Simulation & Proposal
Send your raw water analysis (TDS, temperature, cations/anions), desired permeate capacity, and site conditions. Our process engineering team will deliver a comprehensive mass balance, P&ID layout, and detailed equipment schedule within 48 hours.