Standardized Engineering Catalog
Factory-Direct Desalination & High-Salinity Treatment Systems
Pre-engineered, modularized, and FAT-tested membrane solutions verified under ISO 9001 and European CE standard mandates.
OEM High-Salinity Wastewater Treatment System - ZLD Solutions from China Suppliers and Factory Suppliers, Manufacturers
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OEM China Suppliers Factory Compact Seawater Desalination Equipment for Small-Scale Freshwater Applications Supplier, Manufacturers
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China OEM Precision Manufacturing in China: Leading Suppliers & Factory for Customized Environmental Water Treatment Solutions Suppliers, Manufacturer
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ODM Osmosis-Assisted Reverse Osmosis System for High Salinity Wastewater Concentration - China Suppliers & Factory Factory, Manufacturers
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ODM China Suppliers Factory: Advanced Fracturing Flowback Water Reuse Treatment Equipment for Oil & Gas Operations Suppliers, Manufacturers
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Wholesale China Pharmaceutical Purified Water & WFI System - Reliable Suppliers & Factory Solutions for Quality Water Production Manufacturers, Manufacturer
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OEM Modular Seawater Desalination Equipment from China Suppliers | Factory Prefabricated for Rapid Deployment and Off-Grid Solutions Suppliers, Supplier
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The Global Commercial & Industrial Status of Seawater Conversion
An in-depth perspective on energy intensity, geopolitical freshwater scarcity, and the technical shift toward decentralized containerized RO plants.
Energy Recovery Devices (ERD)
The industrial landscape for turning seawater into freshwater has transitioned decisively away from thermal multistage flash (MSF) evaporation toward reverse osmosis integrated with Isobaric Pressure Exchangers. Specific Energy Consumption (SEC) has been slashed from 8.0 kWh/m³ down to under 2.8-3.2 kWh/m³, making large-scale desalination economically viable for industrial power generation and agricultural development.
Prefabrication & Containerization
Global procurement teams prioritize pre-engineered, skid-mounted, and containerized seawater reverse osmosis (SWRO) packages. Rapid economic growth across the GCC, North Africa, Latin America, and Southeast Asian archipelagoes requires rapid installation without protracted civil construction delays. Prefabricated containers yield up to 65% faster on-site commissioning.
Stringent European CE Governance
International compliance now dictates strict adherence to the Machinery Directive (2006/42/EC), Low Voltage Directive (2014/35/EU), and Pressure Equipment Directive (PED 2014/68/EU). Certified manufacturing facilities must demonstrate hydrostatic weld validation, Duplex 2205 / Super Duplex 2507 metallurgy compliance, and CE conformity across all pressure vessels.
Verified Engineering Authority
Enterprise Qualifications & Integrated Manufacturing Rigor
Combining proprietary intellectual property, Class II national contracting licenses, and complete lifecycle execution under one roof.
National High-Tech Enterprise
Recognized as a Shanghai Specialized & Sophisticated Enterprise, operating dedicated process engineering, pilot test skids, and automated fabrication halls in Shanghai, China.
Class II Contracting Qualifications
Dual Class II national qualifications in Environmental Protection Engineering contracting and Mechanical & Electrical Installation, ensuring total EPC project alignment.
38+ Patents & SCADA Software
Holding extensive intellectual property portfolios in Disc Tube Reverse Osmosis (DTRO), Osmosis-Assisted Reverse Osmosis (OARO), and proprietary automated CIP management logic.
Comprehensive Certifications
Audited and accredited under ISO 9001 (Quality), ISO 14001 (Environmental), ISO 45001 (Occupational Safety), alongside full-scope EU CE compliance directives.
Field-Deployed Reliability
Localized Applications & Mission-Critical Deployment Scenarios
Engineered to operate continuously under severe climatic conditions, extreme salinity levels, and stringent water purity targets.
Remote Islands & Offshore Platforms
Decentralized island populations and offshore rigs require autonomous, containerized SWRO units that produce potable water matching WHO drinking water guidelines directly from variable ocean feedwater (TDS 32,000 to 45,000 mg/L) with automated antiscalant metering and remineralization.
Coastal Heavy Petrochemical & Power
Thermal power utilities and refining complexes need high-volume, reliable demineralized boiler makeup water. Tongjie combines seawater intake clarification with dual-pass SWRO followed by continuous Electro-Deionization (EDI) to consistently supply sub-0.1 µS/cm high-purity feedwater.
Oilfield Fracturing & High-Salinity ZLD
Beyond natural seawater, our Disc Tube Reverse Osmosis (DTRO) and high-pressure membrane concentration systems remediate complex fracturing flowback fluids and industrial brines. The technology achieves oil content ≤ 5 mg/L and SS ≤ 1 mg/L for sustainable reinjection and Zero Liquid Discharge.
Technology Roadmap & Engineering Horizon
Process Integration: From Raw Marine Intake to Ultrapure Water
A breakdown of our multi-barrier treatment train designed to safeguard reverse osmosis membranes from bio-fouling and mineral scaling.
01. Pretreatment
Ultrafiltration (UF) and media filtration reliably lower the Silt Density Index (SDI < 2.5), removing algae, silt, and suspended organics before high pressure stages.
02. Energy Recovery
Isobaric ceramic pressure exchangers transfer the hydraulic energy of rejected high-pressure brine directly to incoming seawater with up to 98% hydrodynamic efficiency.
03. SWRO Separation
Polyamide thin-film composite membrane elements operate at 55 to 70 bar, providing up to 99.8% nominal salt rejection and efficient single-pass boron removal.
04. DTRO / Polishing
For high-recovery configurations and oilfield flowback concentration, Disc Tube RO modules manage high osmotic pressures up to 120-160 bar without spacer-fouling risks.
05. Digital Control
Integrated Siemens PLC architecture with encrypted remote SCADA connectivity enables autonomous flux regulation, dynamic flushing cycles, and real-time predictive CIP tracking.
Comprehensive EPC Delivery
Macro Turnkey Solutions: Built Around Verified Water Chemistry
Eliminating site integration risks through complete Shanghai factory pre-assembly and pre-commissioning protocols.
Standard 20ft & 40ft Container Units
Thermal-insulated, corrosion-resistant shipping containers equipped with industrial air conditioning, internal LED task lighting, motorized ventilation dampers, and integrated duplex stainless steel manifold piping. Systems arrive on site ready for utility tie-ins.
Corrosion Metallurgy & Weld Integrity
Feedwater wetted high-pressure components use certified Super Duplex Stainless Steel (UNS S32750 / EN 1.4410) and high-grade titanium grade 2 to prevent pitting and crevice corrosion under high chloride concentrations, verified via full NDT radiographic checks.
Factory Acceptance Testing (FAT)
Every industrial desalination and water treatment skid undergoes full hydrostatic, pressure decay, and control loop verification at our Shanghai manufacturing facility prior to shipment, drastically cutting on-site contractor commissioning schedules down to days.
Advanced Industrial Lineup
Specialized Concentration, Reuse & High-Purity Water Systems
Explore customized ODM and OEM configurations engineered for demanding industrial water reuse and environmental remediation.
China China ODM Suppliers: Eco-Friendly Water Treatment Solutions from Leading Factory for Your Brand Factories, Manufacturers
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China China Suppliers Factory for Fracturing Flowback Water Reuse Treatment Equipment for Oil & Gas Operations Suppliers, Supplier
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ODM High-Pressure Membrane Concentration System for High-Salinity Wastewater | China Suppliers & Factory Factories, Factory
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CE Certification High-Ratio Water Reuse Equipment Suppliers in China - Advanced Pretreatment, UF & RO Process Factory Factories, Manufacturer
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Wholesale High-Pressure DTRO&STRO Membrane Concentration System from China Suppliers & Factory for High-Salinity Wastewater Treatment Factories, Suppliers
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CE Certification China Suppliers Factory Electronic Ultra-Pure Water System for Semiconductor & Microelectronics with 18.2 MΩ·cm Resistivity Factories, Manufacturer
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ODM High-Efficiency Brine Concentration System - China Suppliers & Factory for Wastewater Treatment Solutions Factory, Manufacturer
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CE Certification China Suppliers Factory Deoxygenation Membrane Equipment for Physical Degassing of Water to ppb Levels Suppliers, Manufacturers
View SpecificationTechnical Inquiries & Knowledge Base
Frequently Asked Questions: Seawater Desalination & High-Salinity Treatment
Essential guidance for procurement engineers, EPC project directors, and facility operations teams.
What parameters are required to generate an engineered SWRO system design?
To provide an accurate engineering proposal and membrane array mass balance, our engineering team requires a comprehensive raw water analysis including: Total Dissolved Solids (TDS), electrical conductivity, operating temperature variations, pH, calcium, magnesium, barium, strontium, silica, turbidity, and Silt Density Index (SDI). Additionally, please clarify the daily target permeate volume (m³/day), intended water application (WHO potable, boiler feed, or agricultural reuse), and available site electrical specifications (voltage, frequency).
How does CE certification impact the procurement of Chinese water treatment machinery?
CE certification guarantees compliance with European health, safety, and environmental protection legislation. For Tongjie equipment, this encompasses the Machinery Directive (2006/42/EC), Low Voltage Directive (2014/35/EU), and Pressure Equipment Directive (PED 2014/68/EU). This assures international contractors that pressure vessels, high-pressure Duplex stainless steel manifolds, and electrical enclosures meet verified structural and operational safety standards.
What specific metallurgy does Tongjie employ to prevent seawater pitting corrosion?
For low-pressure feed and UF filtration sections, we use high-grade 316L stainless steel and marine-grade FRP. For all high-pressure marine piping (operating between 55 to 80 bar), we utilize Super Duplex Stainless Steel (UNS S32750 / 2507) or Duplex 2205 with a Pitting Resistance Equivalent Number (PREN) exceeding 40. This metallurgy prevents pitting and crevice attack in high-chloride, warm-water environments.
How does the energy recovery device (ERD) optimize lifecycle operational expenditure?
Our systems integrate isobaric rotary ceramic pressure exchangers. These ERDs capture the hydraulic energy from the concentrated reject brine stream and transfer it directly to the low-pressure feed stream with hydrodynamic efficiencies up to 98%. This reduces high-pressure pump motor sizing by up to 50% and limits Specific Energy Consumption to below 2.8 - 3.2 kWh/m³.
Can containerized SWRO units run directly on hybrid solar/off-grid setups?
Yes. Tongjie designs containerized SWRO units equipped with Variable Frequency Drives (VFDs) and soft-start logic engineered to interface with solar PV systems, battery banks, and auxiliary diesel generators. Dynamic PLC controls ramp pump speeds smoothly to accommodate power fluctuations without tripping high-pressure membrane interlocks.
What is the lead time and on-site commissioning schedule for containerized units?
Standard containerized seawater desalination systems ranging from 50 m³/day to 1,000 m³/day typically have a manufacturing lead time of 6 to 10 weeks, inclusive of full factory acceptance testing (FAT). Because systems are shipped fully piped and pre-wired, field commissioning requires only external pipe tie-ins and electrical connections, typically taking 5 to 15 days on site.