ISO 9001 & CE Certified Tier-1 Desalination Engineering

Wholesale Sea Water RO System Suppliers & Turnkey Engineering

High-salinity maritime and containerized desalination plants, energy recovery architectures, and industrial membrane water treatment systems engineered for global utilities, EPC contractors, and mission-critical production sites.
Featured Equipment Series (Batch 01)

Engineered Seawater Desalination & High-Salinity Systems

Direct wholesale factory allocations: Pre-tested skid assemblies, containerized plug-and-play SWRO units, and ultra-high recovery industrial pure water infrastructure.

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State of the Technology Whitepaper

The Global Paradigm Shift in Seawater Reverse Osmosis (SWRO)

From energy-intensive thermal flash distillation to isobaric energy recovery, high-flux polyamide thin-film nanocomposites, and modular containerized architectures.

Global industrial water security has entered a critical phase. Rising municipal demands, expanding metallurgical extraction processes, offshore drilling ventures, and coastal petrochemical refining require unprecedented volumes of high-purity water. Seawater Reverse Osmosis (SWRO) has completely superseded traditional Multi-Stage Flash (MSF) and Multi-Effect Distillation (MED) as the dominant global standard. Today, reverse osmosis accounts for over 84% of all newly commissioned municipal and industrial desalination capacity worldwide, driven by dramatic thermodynamic efficiency improvements, skid-mounted modularization, and advanced isobaric pressure exchangers.

"The modern standard of commercial SWRO no longer evaluates raw hydraulic output in isolation; it measures life-cycle kilowatt-hours per cubic meter (kWh/m³), membrane degradation under severe seasonal biological bloom events, boron rejection compliance for agricultural/boiler feeds, and corrosion resistance of high-pressure metallurgies against aggressive chloride pitting."

As an established tier-1 manufacturer and wholesale supplier based in Shanghai, Tongjie operates at the nexus of precision hydraulic fabrication and high-salinity membrane physics. Operating across extreme marine salinity envelopes (from 32,000 ppm TDS in open ocean waters to upward of 48,000–55,000 ppm TDS in the Persian Gulf and Red Sea), our seawater reverse osmosis systems integrate multi-stage mechanical clarification, automatic backwash ultrafiltration (UF), positive-displacement and multi-stage centrifugal high-pressure pumping, isobaric energy recovery devices (ERDs), and automated CIP (Clean-in-Place) flushing modules.

≤ 2.4
Specific Energy (kWh/m³)
99.85%
Typical NaCl Salt Rejection
83.5 bar
Max Design Operating Pressure
38+
Engineering Patents & Certifications

Isobaric Energy Recovery

Utilizing ceramic rotary positive-displacement isobaric energy recovery devices (ERD), our plants transfer hydraulic pressure from the high-pressure concentrate brine directly to incoming seawater feed with over 97.5% net transfer efficiency.

  • Reduces primary pump power requirement by up to 58%
  • Zero dynamic internal mixing zone; no brine dilution

Super Duplex Metallurgy

High-salinity, high-temperature marine environments induce critical crevice corrosion and pitting. High-pressure wetted fluid paths utilize cast or forged Super Duplex Stainless Steel (UNS S32750 / 2507).

  • Pitting Resistance Equivalent Number (PREN) ≥ 42
  • ASME Section VIII, Div 1 Code Stamped High-Pressure Vessels

Membrane Biofouling Control

Advanced pre-treatment leveraging pressurized continuous ultrafiltration (UF) coupled with smart coagulant dosing delivers SDI15 (Silt Density Index) consistently below 2.5.

  • Protects expensive SWRO membrane elements from organic shock
  • Extends membrane replacement cycle past 5 to 7 operational years
Global Procurement Specifications

Enterprise Solutions Tailored by Operational Scenario

A rigorous cross-industry matrix resolving water scarcity across offshore platforms, island grids, petrochemical refineries, and remote mining sites.

Island Utilities & Municipal Grids

Decentralized drinking water stations engineered to satisfy WHO potable guidelines. Features automated two-pass SWRO arrangements targeting <0.5 mg/L boron rejection and integrated remineralization (calcite contactors and CO2 dosing).

  • Permeate Quality: TDS < 200 mg/L; Potable Grade
  • System Recovery: 40% – 50%
  • Packaging: 20ft / 40ft High Cube Insulated Containers

Maritime, FPSO & Offshore Rigs

Designed under strict marine classification rules (DNV-GL, ABS, Lloyd’s Register). Compact skids engineered with anti-vibration dampeners, marine-grade epoxy coatings, explosion-proof ATEX/IECEx electrical classifications, and minimal footprint.

  • Footprint: Up to 35% footprint reduction vs standard
  • Safety: Zone 1 / Zone 2 ATEX Certification Option
  • Intake: High turbidity and oil-in-water separation

Industrial Boiler Feed & Semiconductors

SWRO acting as primary demineralization ahead of double-pass RO, Continuous Electrodeionization (EDI), and mixed-bed polishers. Supplies ultra-low conductivity water for high-pressure boilers and microelectronic fabrication rinses.

  • Resistivity Output: Up to 18.2 MΩ·cm post-polishing
  • Silica Rejection: > 99.2% overall rejection
  • Automation: Siemens S7-1500 / Allen Bradley Rockwell PLC
Standard Series Permeate Output (m³/day) Feed Salinity Range (TDS) High Pressure Metallurgy Energy Recovery Type Footprint Layout
TJ-SWRO-100C 100 m³/day (4.16 m³/h) 30,000 – 45,000 ppm Duplex 2205 / 316L SS Hydraulic Turbocharger 20ft ISO Shipping Container
TJ-SWRO-500C 500 m³/day (20.8 m³/h) 32,000 – 48,000 ppm Super Duplex 2507 Isobaric Pressure Exchanger (PX) 40ft HQ Insulated Container
TJ-SWRO-1500M 1,500 m³/day (62.5 m³/h) 35,000 – 55,000 ppm Super Duplex 2507 (Forged) Dual Isobaric PX Array Open Structural Modular Skid
TJ-SWRO-5000Ind 5,000 m³/day (208.3 m³/h) 32,000 – 45,000 ppm SMO 254 / Super Duplex High-Density Ceramic PX Rack Civil / Turnkey Multi-Train Rack
Reliability & Global Compliance

Factory Acceptance Testing (FAT) & Regulatory Conformity

Every membrane array, high-pressure piping manifold, and automated control loop is rigorously validated under actual pressurized conditions prior to export.

Uncompromising Factory Acceptance Testing (FAT)

The major financial risk faced by EPC contractors and plant operators procuring equipment overseas is site-commissioning failure. Tongjie addresses this through exhaustive, documented in-house testing at our Shanghai fabrication complex:

  • 1.5x Hydrostatic Pressure Testing: All high-pressure pipework, Victaulic coupling joints, and membrane housing arrays undergo hydraulic pressure holding tests exceeding operational thresholds.
  • Full Wet-Loop Simulation: Real saline chemical challenges to verify actual recovery ratios, salt passage, pressure drop, and energy recovery efficiency before shipment.
  • Control Loop & Interlock Validation: Stress-testing VFD pump ramps, automatic high-pressure shut-off trips, conductivity diversion valves, and remote SCADA telemetry.

International Standards & Codes Compliance

Tongjie systems are designed and stamped in accordance with internationally recognized institutional engineering frameworks:

ASME Boiler & Pressure
Sec VIII Div 1 / B31.3 Piping
European CE Marking
Machinery & PED Directives
ISO Tri-Certification
ISO 9001 / 14001 / 45001
Potable Standards
WHO Guidelines / NSF 61
R&D and Future Horizons

Engineering Roadmap: The Next Generation of Desalination

Advancing into AI-driven predictive flux control, biomimetic aquaporin membrane coatings, and Closed-Circuit Desalination (CCD) configurations.

AI Digital Twin & Predictive Maintenance

Our upcoming generation of industrial controllers incorporates neural net normalization algorithms. By cross-analyzing feed temperature fluctuations, differential pressure (dP), and real-time flux decline curves, the system predicts biofouling and scaling events up to 14 days before performance degrades.

Closed-Circuit Reverse Osmosis (CCRO)

For high-recovery inland brackish water and industrial brine concentration, we are commercializing variable-volume, high-recovery CCRO skid units. By circulating concentrate until target recovery is achieved, recovery rates scale from conventional 75% boundaries up to 90%–93% without premature gypsum or silica precipitation.

Zero Liquid Discharge (ZLD) Integration

Coupling SWRO concentrate with Disc Tube Reverse Osmosis (DTRO) and Mechanical Vapor Recompression (MVR) evaporation systems. This closed-loop configuration recovers up to 98.5% of raw water volume, turning troublesome reject streams into commercial-grade crystal salts.

Procurement & Engineering FAQ

Frequently Asked Questions on Wholesale SWRO Engineering

Definitive engineering answers addressing sizing criteria, chemical pretreatment, energy recovery, and lifetime OPEX variables.

What specific water quality metrics are needed to calculate membrane projections and system sizing?
To provide an accurate process projection and budgetary proposal, our engineering team requires: 1) Total Dissolved Solids (TDS) along with comprehensive cation/anion balance (including Na, Ca, Mg, Cl, SO4, HCO3, and especially Reactive Silica SiO2, Barium Ba, Strontium Sr, and Boron B); 2) Raw water temperature envelope (minimum winter vs. maximum summer, as RO membrane permeability shifts ~3% per degree Celsius); 3) Silt Density Index (SDI15) and Turbidity (NTU); 4) Target daily permeate production capacity (m³/day or GPD) and required final purity (potable vs boiler feed conductivity limits); 5) Available on-site electrical supply (Voltage, Frequency, Phase configuration).
How does Tongjie achieve specific energy consumption under 2.5–3.0 kWh/m³ in seawater desalination?
Specific energy reduction is achieved through an integrated three-pillar optimization approach: First, we utilize state-of-the-art isobaric ceramic rotary pressure exchangers (PX) which recover up to 97.5% of the hydraulic pressure energy from the reject stream, transferring it directly back to the membrane feed without secondary electrical conversion. Second, high-pressure pumps are paired with premium-efficiency IE4 motors and precision Variable Frequency Drives (VFDs) that adjust pump speed in real time to match seasonal osmotic pressure shifts. Third, our membrane array flux rates are conservative (typically 12–14 LMH), minimizing hydraulic concentration polarization and net driving pressure requirements.
Why is Super Duplex 2507 specified over Standard 316L Stainless Steel in SWRO high-pressure piping?
Under pressures ranging from 55 to 83 bar and chloride concentrations exceeding 20,000–35,000 mg/L, standard austenitic 316L stainless steel suffers rapid chloride-induced pitting corrosion and stress corrosion cracking (SCC), often within 6 to 18 months of continuous service. Super Duplex 2507 (UNS S32750) has a Pitting Resistance Equivalent Number (PREN) exceeding 42 (compared to ~25 for 316L), providing absolute resistance to crevice corrosion, superior yield strength under high mechanical cycling, and vastly extending system design life past 20 operational years.
How do containerized plug-and-play seawater RO plants handle rapid deployment and commissioning?
Tongjie containerized SWRO units are fully integrated inside standardized 20ft or 40ft ISO shipping containers. Pretreatment media filters or ultrafiltration, chemical dosing skids, high-pressure booster assemblies, membrane pressure vessels, Clean-in-Place (CIP) systems, and PLC electrical cabinets are fully wired, plumbed, insulated, and climate-controlled within the enclosure before leaving the Shanghai factory. On site, operators simply anchor the container onto a level concrete pad, connect feed intake piping, brine discharge piping, permeate delivery piping, and main power. Normal commissioning takes less than 3 to 5 operational days.
What is the typical operational lifespan of the SWRO membranes, and how is biofouling prevented?
In properly managed systems utilizing Tongjie pre-treatment configurations, reverse osmosis membranes achieve a standard lifespan of 5 to 7 years. Biofouling prevention relies on a multi-stage barrier: 1) Continuous multi-media coagulation/flocculation or ultrafiltration (UF) holding SDI15 < 2.5; 2) Dosing of certified phosphonate or polyacrylate scale inhibitors to avoid calcium carbonate or sulfate scaling; 3) Automatic low-pressure permeate flushing cycles during every shutdown to displace high-salinity brine from the membrane surface; 4) Ergonomic automated Clean-in-Place (CIP) systems utilizing specialized alkaline and acidic cleanings whenever differential pressure across any stage increases by 15%.
Featured Equipment Series (Batch 02)

Specialized Industrial, DTRO, & Pure Water Solutions

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Direct Engineering Support

Request a Custom SWRO System Mass Balance & Equipment Projection

Send your raw water laboratory report (TDS, temperature, cations/anions) and target daily capacity. Tongjie's licensed chemical and mechanical engineers will deliver a comprehensive technical proposal, P&ID diagram, and factory-direct wholesale pricing within 24 hours.

Consult with an SWRO Engineer Download Engineering Catalog