Core Seawater & High-Salinity Treatment Equipment
Pre-engineered skids and containerized units manufactured, assembled, and factory-tested under rigorous ISO 9001 and CE directives before global deployment.
Deoxygenation Membrane Physical Degassing Unit
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High-Efficiency Brine Concentration System
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ODM/OEM Precision Custom Water Solution Skid
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Oilfield Fracturing Flowback Water Reuse Unit
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High-Salinity Wastewater Volume Reduction Skid
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Zero Liquid Discharge (ZLD) Treatment Plant
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High-Ratio Industrial Water Reuse System
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Zero-Discharge Flowback Fluid Processing Plant
View Product SpecificationGlobal Water Scarcity & The Strategic Shift to Oceanic Infiltration
With continental aquifers facing terminal depletion and regulatory caps constraining municipal intake, industrial manufacturing, petrochemical refining, and coastal energy grids depend unequivocally on advanced Seawater Reverse Osmosis (SWRO) and Zero Liquid Discharge (ZLD) architectures.
Capital Optimization & LCOW
Modern coastal mega-plants require levelized cost of water (LCOW) benchmarks under $0.65 to $0.85 per cubic meter. Achieving this requires high-efficiency isobaric energy recovery devices (ERD), ultra-low fouling polyamide composite membranes, and precision hydraulic skid engineering.
Stringent Effluent Standards
Discharge permits across the GCC, EU, and Asia Pacific strictly regulate thermal pollution, chemical biocides, and hyper-saline brine discharge. Chinese manufacturing hubs now lead in integrating pre-concentration and MVR crystallizers to transition facilities into zero-discharge assets.
Decentralized Infrastructure
Offshore exploratory platforms, remote mineral processing belts, and isolated island resorts demand self-contained, pre-commissioned containerized plants capable of rapid plug-and-play startup without civil engineering lead times or complex field fabrication.
Global Industrial Footprint & CapEx/OpEx Optimization
How China's premier seawater treatment factories bridge the gap between heavy precision metallurgy, cutting-edge separation chemistry, and cost-efficient EPC project execution.
Technical Baseline: ISO 9001, CE Certified Engineering by Shanghai Tongjie
Founded in 2010 in Shanghai, Shanghai Tongjie Environmental Protection Technology Co., Ltd. has evolved into a recognized National High-Tech Enterprise and Shanghai Specialized & Sophisticated Enterprise. Holding Class II contracting qualifications in environmental protection engineering and mechanical & electrical installations, our engineering factory operates over 38 invention and utility patents. We manufacture industrial pure water systems, seawater RO skids, high-salinity ZLD units, and disc-tube reverse osmosis (DTRO) modules for global clients seeking absolute process reliability.
Metallurgical Superiority
Raw seawater at 35,000–45,000 ppm TDS causes rapid pitting and stress corrosion cracking in conventional steels. Tongjie standardizes high-pressure wetted manifolds in 2507 Super Duplex Stainless Steel (UNS S32750), 904L, or Grade 2 Titanium, combined with ASME-certified high-pressure FRP housings.
Intelligent Variable VFD Architecture
Seawater temperatures fluctuate drastically across seasons, swinging feed osmotic pressure. Our automation software pairs multi-stage centrifugal pumps with intelligent variable frequency drives (VFD) and automated throttling valves to optimize dynamic energy consumption without flux starvation.
End-to-End Skid Testing (FAT)
Every system constructed at our Shanghai production floor undergoes 100% full-hydraulic Factory Acceptance Testing (FAT). We test instrumentation loop integrity, membrane integrity, high-pressure relief triggers, and PLC logic sequences prior to global container loading.
Engineering Architecture & The Multi-Barrier Separation Train
A resilient seawater desalination plant must conquer dynamic biofouling, particulate loading, and boron passage. Below is the battle-tested engineering sequence built into Tongjie factory systems.
Multi-Stage Treatment Topology: From Raw Sea Influx to Boiler-Ready Feed
1. Intake & Flocculation Pretreatment: Seawater drawn via deep open intake or beach wells passes through coarse mechanical screening followed by coagulant dosing. Dissolved Air Flotation (DAF) or high-rate multimedia dual-sand filters remove suspended solids, algae blooms, and marine silt, lowering turbidity to < 0.5 NTU.
2. Ultrafiltration (UF) Polishing Barrier: Pressurized PVDF hollow fiber ultrafiltration membrane modules (nominal pore size 0.02 - 0.05 micron) maintain a continuous Silt Density Index (SDI15) of < 2.5, shielding the fragile thin-film composite reverse osmosis elements from colloidal deposition.
3. Chemical Conditioning & Cartridge Guard: Dosing stations introduce antiscalant to prevent calcium carbonate, barium sulfate, and silica scaling, alongside sodium bisulfite (SBS) for non-oxidative dechlorination. A 5-micron melt-blown polypropylene safety filter guards against upstream particulate escape.
4. High-Pressure SWRO Core: Utilizing premium spiral-wound polyamide elements rated for 1,200 psi operating pressures, feed seawater is split into crystal-clear permeate and concentrated brine. Coupled isobaric rotary pressure exchangers recover up to 98% of the hydraulic reject energy, transferring it directly to the auxiliary feed stream.
5. Post-Treatment & Degasification: Permeate undergoes remineralization (calcite contactors / CO2 injection) for drinking networks, or passes through deoxygenation membrane contactors and double-pass RO/EDI stages for boiler feed and semiconductor ultra-pure water (UPW) specifications.
Intake & Clarification
Screening, coagulation, DAF algae interception, and multimedia filtration reducing raw SDI down to manageable limits.
UF Fine Filtration
Automated hollow-fiber barrier guaranteeing SDI15 < 2.5, automated air-scour and CEB chemical cleaning cycles.
High-Pressure SWRO
Super Duplex positive displacement/centrifugal pumps, isobaric ERD, and high-rejection spiral-wound SWRO membranes.
EDI / Degassing
Electrodeionization polishing and gas-transfer membrane contactors delivering conductivity <0.1 µS/cm for high-spec utilities.
Localized Application Scenarios: Tested in Demanding Environments
From extreme thermal fluctuations in Middle Eastern deserts to remote maritime islands in Southeast Asia, our factory-built water plants are engineered to overcome regional water chemistries.
Island Resorts & Coastal Communes
Turnkey 20ft and 40ft containerized SWRO units supplying 100 m³/day to 5,000 m³/day of potable drinking water. Integrated with heavy-duty acoustic insulation, motorized intake louvers, internal thermal HVAC, and fully automated CIP skids for minimal operator intervention.
Coastal Petrochemical & Power Stations
Heavy-duty process water plants producing demountable ultra-pure boiler feed. Membrane degassing removes dissolved O2 and CO2, while dual-pass RO followed by EDI guarantees silicate < 10 ppb and sodium < 5 ppb, stopping turbine scaling and pipeline pitting cold.
Oil & Gas Produced Water & DTRO
In Kazakhstan and the Middle East, our skid-mounted DTRO (Disc Tube Reverse Osmosis) systems process fracturing flowback water under challenging organic loadings. Systems reduce oil content to ≤5 mg/L and suspended solids to ≤1 mg/L for reinjection compliance or reuse.
Global Compliance Standards & Comprehensive Lifecycle Support
Overseas procurement demands absolute transparency, verified quality systems, and responsive after-sales engineering to safeguard multi-million dollar industrial assets.
CE, ISO 9001 / 14001 / 45001
Tongjie products comply with the European Pressure Equipment Directive (PED 2014/68/EU), Low Voltage Directive, and Machinery Safety Directives. Our Shanghai manufacturing facilities enforce traceable material mill certs (EN 10204 3.1) on all high-pressure components.
IoT Remote Telemetry & Diagnostics
Equipped with industrial 4G/5G edge gateways, our systems deliver real-time operational telemetry (transmembrane pressure, flux decay, feed conductivity, and normalized differential pressure) directly to your engineers and Tongjie’s central diagnostic hub for proactive maintenance.
Turnkey Commissioning & Spares
We deploy factory-trained field engineers for on-site commissioning, mechanical tie-in oversight, and operator qualification. Our standardized spare parts repository provides rapid worldwide dispatch of replacement membranes, cartridge filters, high-pressure seals, and sensors.
Technological Roadmap: The Next Decade in Seawater Treatment
The convergence of renewable energy, artificial intelligence, and advanced nanomaterials is driving the next evolution of seawater processing. Shanghai Tongjie is actively driving R&D across three transformative domains:
Direct-Coupled Off-Grid Solar & Wind SWRO
Developing dynamic control algorithms that buffer erratic photovoltaic and wind generation directly into variable-speed high-pressure pumping matrices without heavy battery bank CapEx, dramatically lowering off-grid desalted water production costs.
AI-Enabled Predictive Biofouling Mitigation
Training neural networks on raw seawater optical density, seasonal sea surface temperature (SST), and differential pressure dynamics. Systems self-initiate proactive sub-cleaning flushes and antiscalant adjustments before irreversible membrane biofilm compaction occurs.
Valuable Mineral Recovery & Brine Valorization
Transitioning seawater brine from an environmental waste into a commercial resource. Tongjie is testing nanofiltration fractioning cascades to selectively extract battery-grade magnesium, calcium salts, and trace lithium compounds from hyper-saline SWRO rejects.
Specialized Desalination, Purified Water & Volume Reduction
Explore additional field-proven industrial solutions engineered and manufactured by Shanghai Tongjie Environmental Protection Technology Co., Ltd.
Pharma Purified Water & WFI Generation Skid
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High-Efficiency Brine Concentration System
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Osmosis-Assisted High Salinity Brine System
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Membrane-Based Brine Concentration Skid
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Modular Containerized Seawater Desalination Plant
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Advanced Pretreatment UF & RO Water Reuse Skid
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Brine Concentration & Volume Reduction System
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Eco-Friendly Integrated Industrial Treatment Skid
View Product SpecificationFrequently Asked Questions: Industrial Procurement & Engineering
Critical engineering considerations, analytical data requirements, and deployment protocols for overseas EPCs and plant asset managers sourcing from China.
What comprehensive raw water parameters are mandatory for an exact SWRO proposal?
To produce an authoritative mass balance and guaranteed membrane projection, our engineering team requires: complete ionic balance (TDS, Na+, Ca2+, Mg2+, Cl-, SO4 2-, HCO3-), total silica (SiO2), barium, strontium, dissolved iron/manganese, continuous SDI15 or turbidity readings, raw water temperature range (minimum and maximum), biological loading (TOC, chlorophyll-a for algal bloom risks), and target daily permeate flow rate. Supplying site power metrics (e.g., 380V/480V, 50Hz/60Hz) enables precise motor and VFD selection.
How fast can Tongjie containerized seawater desalination plants achieve stable production?
Because every containerized unit is 100% pre-piped, electrically integrated, and hydraulically tested (FAT) at our Shanghai facility, on-site commissioning typically takes just 5 to 10 days post-arrival. Site contractors need only provide raw water feed piping, brine discharge/drain headers, treated permeate off-take connections, and primary grid or generator power feeds.
How does Tongjie resolve severe boron rejection challenges in seawater applications?
Natural seawater boron concentrations often range between 4.5 and 6.0 mg/L, exceeding WHO drinking thresholds (0.5–1.0 mg/L) and agricultural crop safety limits. Because non-ionized boric acid passes easily through standard single-pass SWRO at natural pH (pH 7.8–8.2), Tongjie engineers custom two-pass RO configurations with inter-stage sodium hydroxide (NaOH) dosing to elevate second-pass feed pH above 9.5. This ionizes boric acid into borate, boosting total system boron rejection past 99%.
Can your systems treat fracturing flowback and produced water in oil & gas fields?
Yes. Our oilfield treatment process couples chemical de-oiling and specialized coagulation-softening with open-channel Disc Tube Reverse Osmosis (DTRO). Operating reliably under severe chemical oxygen demand (COD) and extreme scaling salts, the system delivers treated reinjection water with oil ≤ 5 mg/L and suspended solids (SS) ≤ 1 mg/L, providing an effective zero-discharge solution for deep shale and tight oil fields.
What engineering credentials and quality validation does Shanghai Tongjie provide?
Shanghai Tongjie holds ISO 9001, ISO 14001, ISO 45001, and full CE conformity certifications. Recognized as a National High-Tech Enterprise and Shanghai Specialized & Sophisticated Enterprise, the company holds Class II contracting qualifications for environmental protection and mechanical & electrical installations. We support international EPCs with complete IQ/OQ/PQ validation paperwork, weld radiography records, passivation records, and automated SCADA audit trails.