Factory-Direct Seawater Desalination & High-Salinity Processing Skids
Explore our pre-assembled, factory-tested (FAT) modular water purification and wastewater reduction units ready for fast global deployment.
OEM High-Salinity Wastewater Treatment System - ZLD Solutions
OEM China ODM Eco-Friendly Water Treatment Solutions for Global Markets
Advanced Fracturing Flowback Water Reuse Treatment Equipment
China Eco-Friendly Water Treatment Solutions with ODM Services
Advanced Fracturing Flowback Fluid Treatment System - Reliable Factory
CE Certification Containerized Seawater Desalination Plants
Industrial Demineralized Water Equipment - High-Purity RO & EDI
Factory-Integrated Containerized Seawater Desalination Plants
Industrial Desalination & High-Flux Seawater Purification Framework
Evaluating thermodynamic recovery, salt-passage mitigation, isobaric energy extraction, and total cost of ownership across heavy manufacturing and municipal utilities.
Tackling Scarcity Through Advanced High-Pressure Separation
Global industrialization and arid coastal urbanization have redefined freshwater procurement. As conventional aquifers decline and regulatory bodies impose strict salinity discharge limits, wholesale purified seawater has shifted from a municipal contingency to a core industrial utility. Contemporary Seawater Reverse Osmosis (SWRO) facilities must achieve extraordinary thermodynamic efficiency while tolerating high osmotic pressures up to 70–85 bar and feed total dissolved solids (TDS) exceeding 35,000 to 45,000 mg/L.
Shanghai Tongjie Environmental Protection Technology Co., Ltd. architects comprehensive membrane separation lines that decouple industrial manufacturing from municipal water grids. By harmonizing micro-bubble dissolved air flotation (DAF), ultrafiltration (UF) pre-treatment, spiral-wound polyamide composite membranes, and isobaric ceramic energy recovery devices (ERD), our turnkey plants cut specific energy consumption (SEC) to below 2.8–3.2 kWh/m³ of permeate produced.
Beyond raw potable water conversion, our heavy engineering capability extends downstream to Electro-Deionization (EDI), mixed-bed polishing, and catalytic vacuum deoxygenation. This produces technical demineralized water (resistivity > 16–18 MΩ·cm) essential for high-pressure power utility boilers, semiconductor cleanrooms, pharmaceutical synthesis, and green hydrogen proton exchange membrane (PEM) electrolyzers.
Systemic Reliability & Materials Metallurgy
Seawater environments represent one of the most corrosive industrial atmospheres due to high chloride ion concentrations, elevated temperatures, and microbiological bio-fouling risks. Our engineering matrix specifies:
- Wetted Metallurgy: Super Duplex Stainless Steel (UNS S32750 / 2507) and Titanium Grade 2 for all high-pressure manifolds, impellers, and relief valves (PREN > 42).
- Low-Pressure Piping: Schedule 80 Polyvinyl Chloride (PVC) and Vinylester Resin Reinforced Fibreglass (FRP) rated for raw intake conditions.
- Membrane Element Geometry: 8-inch diameter spiral-wound aromatic polyamide composite configurations with 34-mil spacer geometry to avoid particulate clogging.
- Autonomous Monitoring: Real-time Silt Density Index (SDI-15), Oxidation-Reduction Potential (ORP), normalized permeate flux, and automated clean-in-place (CIP) triggers.
| Water Matrix Parameter | Raw Seawater Intake | Tongjie SWRO Permeate | Two-Pass SWRO + EDI Output | Concentrated Brine (ZLD Feed) |
|---|---|---|---|---|
| Total Dissolved Solids (TDS) | 35,000 – 44,000 ppm | < 250 – 400 ppm | < 0.1 ppm (18.2 MΩ·cm) | 70,000 – 160,000 ppm |
| Chloride & Sodium Content | ~30,000 ppm Cl / Na | < 150 ppm | Non-Detectable (< 1 ppb) | > 95,000 ppm |
| Boron Concentration | 4.5 – 6.5 mg/L | < 0.8 mg/L (WHO Std) | < 0.05 mg/L | 12.0 – 22.0 mg/L |
| Turbidity / Fouling Index | SDI > 5.0 (Variable) | SDI < 1.0, Turbidity < 0.1 NTU | Particle-free (< 0.05 µm) | Suspended solids mitigated |
| Process Energy Footprint | Intake pumping: 0.2 kWh/m³ | Net SEC: 2.8 – 3.2 kWh/m³ | Additional 0.5 – 0.8 kWh/m³ | Thermal/DTRO combined |
| Typical Industrial Classification | Untreated Feed | Potable / Cooling Tower | Ultra-Pure / Pharma / Semi | Crystallizer Inflow |
Turnkey Desalination Scenarios Across Global Heavy Industry
From offshore platforms in the Arabian Gulf to chemical parks across Southeast Asia, our skid-mounted equipment supports demanding commercial environments.
Offshore Oil Platforms & FPSO Vessels
Tongjie engineers compact, vibration-resistant containerized desalination systems engineered to meet ABS and DNV-GL offshore certifications. These units withstand harsh marine swells and supply critical potable water, washwater, and injection feedstocks.
- Explosion-proof ATEX / IECEx certified electrical switchgear.
- Automated CIP systems mitigating bio-film fouling from warm tropical seas.
- Compact footprint footprint reducing topside payload demands.
Coastal Mega-Refineries & Power Stations
Thermal power plants, coal chemical synthesis complexes, and petrochemical crackers utilize high-recovery RO plants to convert raw seawater into low-conductivity boiler feed water, avoiding silica scaling on high-pressure turbines.
- Two-pass RO trains maintaining permeate silica below 0.02 mg/L.
- Integration with membrane contactor deoxygenators for dissolved O₂ < 5 ppb.
- High continuous uptime (> 96% operational availability factor).
Island Resorts & Arid Municipal Grids
Remote islands and arid coastal developments rely on skid-mounted containerized SWRO units that function off-grid, frequently paired with localized solar PV and battery storage systems (BESS) for reliable zero-carbon freshwater generation.
- Plug-and-play ISO 40-foot container shipping standard.
- Post-treatment calcite filtration and remineralization for potable taste.
- Remote cloud SCADA telemetry with automated chemical dosing.
Zero Liquid Discharge (ZLD) & Disc Tube Reverse Osmosis (DTRO)
Converting hyper-saline reject streams and hydraulic fracturing flowback into clean recovered condensate and transportable solid mineral salts.
DTRO Open-Channel Engineering
Standard spiral-wound elements cannot process solutions beyond 85,000 mg/L TDS without severe channel fouling and colloidal blinding. Shanghai Tongjie utilizes Disc Tube Reverse Osmosis (DTRO) modules designed for extreme physical duties:
- Hydraulic Fluid Dynamics: Narrow hydraulic disc chambers with embossed flow deflectors induce high turbulence, preventing concentration polarization.
- Pressure Thresholds: Operational pressure ratings of 90 bar, 120 bar, and 160 bar for continuous operation on high-density brines.
- Unrestricted Maintenance: Every membrane cushion and O-ring can be independently inspected and swapped in minutes, dramatically reducing operating costs compared to glued module configurations.
The ZLD Thermal-Membrane Integration Nexus
Direct thermal evaporation of high-volume wastewater is energy-intensive and cost-prohibitive. Tongjie's integrated ZLD engineering process adopts a multi-tier concentration philosophy:
First, feed brine undergoes high-rate chemical softening (lime-soda or caustic dosing) and multimedia/UF filtration to eliminate calcium, magnesium, barium, and reactive colloidal silica. Second, electro-osmosis or high-pressure DTRO pre-concentrates the stream from 35,000 ppm to 120,000 ppm TDS, returning over 70% of the volume as clean industrial permeate.
Third, only the concentrated residual is routed to our Mechanical Vapor Recompression (MVR) falling-film evaporators and forced-circulation crystallizers. By recycling secondary latent vapor via high-efficiency titanium centrifugal compressors, power consumption drops from > 80 kWh/ton in standard multi-effect evaporators down to < 25–35 kWh/ton of evaporated condensate.
E-E-A-T Credibility: Shanghai Tongjie Manufacturing Rigor
Backed by over 38 patents, certified management systems, and factory acceptance test (FAT) facilities in Jiading District, Shanghai.
ISO Tri-System Accreditation
Fully verified operations holding ISO 9001:2015 (Quality), ISO 14001:2015 (Environmental Management), and ISO 45001:2018 (Occupational Health & Safety).
Class II Engineering Contractor
Official Chinese National Qualification for Environmental Protection Engineering Contracting and Mechanical/Electrical Equipment Installation.
CE Mark Compliance
Conforming to the EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU, with complete Technical Construction Files (TCF).
Remote IoT SCADA Architecture
Proprietary cloud telemetry modules enable remote process monitoring, early flux decay detection, and real-time overseas engineering support.
The Next Frontier in Seawater Purification & Brine Valorization
Emerging developments in biomimetic aquaporin channels, direct solar-membrane coupling, and automated digital-twin operating systems.
Biomimetic Aquaporin Membranes
Next-generation polyamide active layers embedded with synthetic aquaporin protein channels show up to 40% higher water flux at equivalent driving pressures, offering lower capital footprints for high-capacity installations.
Direct-Coupled Solar Photovoltaic SWRO
By pairing variable-frequency high-pressure drives (VFD) with smart microgrids, our off-grid systems match variable solar generation directly to membrane flux rates, removing the need for oversized battery energy storage systems.
AI Digital Twin Operational Modeling
Machine-learning models continuously analyze sensor inputs (feed temperature, TDS, pressure differential, membrane flux decay) to forecast scaling thresholds, schedule precise CIP chemical sequences, and extend membrane life by up to 35%.
Engineering Q&A: Specifying Wholesale Desalination Equipment
Key process design criteria, operational thresholds, and technical answers for procurement directors, EPC contractors, and plant engineers.
To deliver an accurate process balance and P&ID layout, our engineers require: a complete inorganic analysis (TDS, sodium, calcium, magnesium, barium, chloride, sulfate, silica, and boron), temperature variations across seasons, Turbidity and Silt Density Index (SDI-15), Total Organic Carbon (TOC), available electrical power (voltage/frequency), and the required permeate capacity and end-use water specifications.
Seawater contains natural boron concentrations around 4.5 to 6.5 mg/L. Uncharged boric acid (H₃BO₃) readily crosses reverse osmosis membranes at neutral pH. Tongjie implements a specialized two-pass arrangement where pass-1 permeate is dosed with sodium hydroxide to elevate the pH above 9.5–10.0, converting boric acid into charged borate ions (B(OH)₄⁻) which the second pass membranes reject at rates exceeding 95%, safely reaching WHO limits of < 0.5–0.8 mg/L.
Our containerized seawater RO systems are prefabricated, piped, wired, and wet-tested in our Shanghai facility before export. Once delivered to site, technicians connect the raw intake, permeate discharge, reject drain, and power supply. Mechanical and electrical commissioning typically takes 7 to 15 days, significantly faster than conventional civil-constructed desalination infrastructure.
We use a multi-barrier pre-treatment train: micro-coagulation dosing, media or pressurized ultrafiltration (UF) delivering SDI-15 < 2.5, followed by cartridge filtration (5 micron) and continuous ORP-monitored bisulfite dechlorination. High-performance phosphonate antiscalants are dosed via flow-paced pumps to maintain sparingly soluble salts in solution, supported by automated low-pressure permeate flushes during shutdowns.
Yes. Our oilfield series integrates multi-stage dissolved air flotation (DAF), organo-clay adsorption, chemical softening, and open-channel Disc Tube Reverse Osmosis (DTRO). This multi-stage process reliably lowers oil content to ≤ 5 mg/L and suspended solids to ≤ 1 mg/L, making the effluent suitable for subsurface reinjection or reuse in fracturing base-fluids.
Yes. Tongjie regularly works with engineering procurement contractors, municipal utilities, and water system brands worldwide. We support customized skid structures, branded container wraps, localized HMI/PLC software (Siemens, Allen-Bradley, Schneider), native documentation, and complete third-party inspection protocols (SGS, TÜV, Bureau Veritas).
Specialized Membrane Equipment, Brine Concentrators & Flowback Units
Explore our full line of specialized deoxygenation, off-grid modular desalination, and zero-liquid-discharge engineering skids.
Modular Containerized Seawater Desalination - Rapid Off-Grid Solar
CE Certified Fracturing Flowback Water Reuse Treatment Equipment
High Salinity Brine Concentration System - Osmosis-Assisted Technology
Wholesale Deoxygenation Membrane Equipment - Physical Degassing
High-Salinity Wastewater Reduction System - Advanced ZLD Technology
Modular Containerized Seawater Desalination - Rapid Factory Delivery
Fracturing Flowback Water Reuse Treatment Equipment - Oil & Gas
Eco-Friendly Water Treatment Solutions - Trusted Industrial Factory
Need an Engineered Proposal for Your Project?
Submit your raw seawater analysis or wastewater parameters. Shanghai Tongjie’s engineering team will return complete membrane projections, system P&ID schematics, and an equipment schedule within 48 business hours.