What information do you need to size a seawater RO or industrial water treatment system?

Send a recent raw water analysis (TDS, conductivity, hardness, silica, iron/manganese, SDI or turbidity, oil and suspended solids where relevant), feed water temperature range, required product water quality and daily capacity, target recovery, available power supply (voltage/frequency), site conditions and whether you prefer a skid or containerized layout. With this data our engineers prepare a process design, mass balance and equipment list.

How fast can a containerized seawater desalination plant start producing water?

Tongjie containerized seawater RO units are fully prefabricated, assembled and tested in our Shanghai factory before shipment. On arrival the unit only needs basic power, intake and product water connections, so commissioning is short and predictable, which suits emergency supply, remote islands, construction camps and decentralized permanent supply.

Can your oil and gas produced water system meet reinjection requirements?

Yes. The system combines oil removal, softening, disc tube reverse osmosis (DTRO) and concentration. Treated reinjection water reaches oil content of 5 mg/L or less and suspended solids of 1 mg/L or less, enabling zero-discharge reuse of fracturing flowback. The skid-mounted container design can be commissioned within about 15 days and supports unmanned operation with remote monitoring for sites such as the Middle East and Kazakhstan.

Do your pharmaceutical purified water systems support validation?

Our pharmaceutical water systems use pretreatment, precision filtration, RO and EDI, and are built to pharmaceutical engineering practice with online monitoring of conductivity, temperature and flow. Data is recorded and traceable, and documentation is prepared to support your validation and qualification activities.

Do you offer ODM/OEM water treatment equipment?

Yes. We supply ODM/OEM membrane systems for distributors, EPC contractors and equipment brands, including customized capacity, materials, control systems, container layouts, labeling and documentation.

Which certifications and qualifications does Tongjie hold?

Tongjie holds CE certification and ISO 9001, ISO 14001 and ISO 45001 management system certifications. The company is a National High-Tech Enterprise and Shanghai Specialized & Sophisticated Enterprise, holds Class II contracting qualifications in environmental protection engineering and in mechanical and electrical installation, and owns more than 38 invention and utility patents plus software copyrights.

Industrial Whitepaper & Solutions Matrix

China Turn Salt Water Into Drinking Water Factory & Suppliers

Precision-engineered Reverse Osmosis (SWRO), thermal evaporation, and hybrid demineralization systems for sovereign municipal utilities, remote islands, and offshore resource extraction.

99.8%

Salt Rejection Efficiency

≤ 2.2 kWh

Specific Energy Consumption / m³

38+

Proprietary Engineering Patents

50+ Countries

Global Commissioning Footprint

Primary Deployments

Standardized SWRO & Core Separation Machinery

Explore our core engineering catalog of modular, skid-mounted, and containerized seawater conversion infrastructure manufactured in Shanghai.

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Industrial Perspective

Transforming Saline Hydrology Into Potable Capital

Addressing structural water scarcity through high-recovery membrane architecture and thermodynamically optimized separation processes.

As freshwater withdrawal caps reach ecological thresholds worldwide, the commercial capability to turn salt water into drinking water has transitioned from an emergency mitigation tactic to a baseload utility imperative. Conventional thermal distillation (MSF/MED), while robust against severe fouling, demands heavy thermodynamic footprints (often requiring upwards of 10–15 kWh/m³ equivalent). Modern engineered seawater reverse osmosis (SWRO) facilities manufactured in China operate at specific energy consumption metrics below 2.8 kWh/m³, leveraging isobaric Energy Recovery Devices (ERDs) and high-flux spiral-wound polyamide nanocomposite membranes.

Severe Oceanic Hydrology

Seawater conditions vary dynamically from the Arabian Gulf (TDS > 45,000 ppm, temperatures reaching 38°C) to open marine zones (TDS ~35,000 ppm). Chinese engineering designs incorporate multi-stage hydraulic buffering, anti-scalant dosing calibration, and customized osmotic backwash systems to sustain operational uptime without premature flux decline.

Boron & Bromide Depletion

Converting oceanic brine into verified municipal potable water requires strict chemical compliance with WHO parameters. Standard single-pass systems often leave boron concentrations above 1.5 mg/L. Our factory configurations utilize advanced second-pass brackish RO polishing with pH adjustment, driving boron below 0.5 mg/L to safeguard agricultural security and human physiological thresholds.

Ecological Brine Dispersion

Discharging high-density brine without adequate environmental consideration risks coastal hypoxia and thermal plume disruption. Modern turn-key desalination implementations engineered by Tongjie integrate variable-depth multiport diffuser models and energy dissipation valves to maximize dilution dynamics within local hydrographic mixing zones.

Localized Scenarios

Application Archetypes: From Offshore Drilling to Island Grids

Deploying specialized water conversion units calibrated for remote geographics, space restrictions, and variable water sources.

Island Resorts & Sovereign Outposts

Remote island municipalities lack surface hydrology and face catastrophic logistics costs importing barged water. Containerized plug-and-play SWRO systems provide decentralized independence. Systems feature fully automated multi-media filtration and integrated hypochlorite disinfection to supply hotels, resorts, and permanent residents with potable water conforming strictly to WHO Guidelines.

Offshore Oil Platforms & Marine Vessels

Marine environments necessitate rugged corrosion containment. Tongjie's skid-mounted SWRO skids utilize Duplex 2205, Super Duplex 2507, and SMO 254 stainless steels for high-pressure flow paths, resisting pit and crevice corrosion under continuous high chloride exposure. Small footprints with explosion-proof electrics make them ready for marine rigs.

Coastal Mega-Industrial Parks & Refineries

Petrochemical, fertilizer, and metal smelting complexes require hundreds of thousands of cubic meters daily for cooling tower make-up and high-pressure boiler feed. Our direct-intake SWRO designs prevent municipal tap exhaustion, incorporating micro-flocculation DAF (Dissolved Air Flotation) clarifiers to protect membranes during red-tide algae blooms.

Technical Verification

Engineering Benchmarks: Seawater Desalination Matrix

Comprehensive design specifications verified across standard skid-mounted and containerized deployments.

System Architecture Indicator	Standard Island Model (TJ-SW-500)	Offshore Heavy Industrial (TJ-SW-2500)	Municipal Skid Array (TJ-SW-10000)
Nominal Permeate Output	500 m³/day (20.8 m³/h)	2,500 m³/day (104.1 m³/h)	10,000 m³/day (416.6 m³/h)
Feed Salinity Limits (TDS)	Up to 38,000 ppm	Up to 45,000 ppm	Up to 42,000 ppm
Pretreatment Infrastructure	Dual Media Filtration + 5μm Cartridge	Ultrafiltration (PVDF UF) + 1μm Polish	DAF Clarification + UF Skids
Membrane Metallurgy Class	SS316L / Duplex 2205 Manifolds	Super Duplex 2507 Wetted Parts	Super Duplex 2507 + Non-metallic FRP
Energy Recovery Device (ERD)	Hydraulic Turbocharger (>82% recov.)	Isobaric Pressure Exchanger (>96%)	Isobaric Ceramic Rotor Array (>97%)
Permeate Quality Metrics	TDS < 400 mg/L, Boron < 0.8 mg/L	TDS < 200 mg/L, Boron < 0.5 mg/L	TDS < 150 mg/L, Boron < 0.4 mg/L
Automation Protocol	Siemens S7-1200 / Touch HMI	Siemens S7-1500 / SCADA Redundant	DCS Distributed / Dual Ethernet / Cloud

Manufacturing Precision

Chinese Supply Chain Resilience & Shanghai Factory Delivery

Combining world-class component sourcing, integrated precision welding, and complete Factory Acceptance Testing (FAT) under one roof.

Vertical Integration

Shanghai Tongjie manages every aspect in-house: frame skid fabrication, automated robotic orbital pipe welding, control panel coding, and final hydraulic stress testing, slashing external outsourcing bottlenecks.

Rigorous Full-Load FAT

Every SWRO plant undergoes simulated wet testing in our Shanghai manufacturing bays using high-salinity test tanks prior to packaging, ensuring hydraulic integrity, zero flange leakage, and immediate site readiness.

Certified QA Governance

Our facility adheres strictly to ISO 9001, ISO 14001, and ISO 45001 management frameworks, and our machines carry valid CE directives for pressure equipment (PED), machinery safety, and low-voltage electrical standards.

Containerized Rapid Logistics

Housed in ISO standard 20-foot and 40-foot HQ insulated sea containers, our systems function as self-contained water utilities ready for deep-sea shipment directly from the Port of Shanghai to any destination globally.

Forward Engineering

Technology Roadmap: Next-Generation Desalination Paradigms

Iterating advanced material sciences, artificial intelligence telemetry, and zero-carbon hybrid power designs.

Graphene & Biomimetic Aquaporin Membranes

Collaborating with premier polymer institutes in Shanghai, Tongjie is bench-testing biomimetic aquaporin layers and graphene-enhanced hollow fibers to lower hydraulic pressure demands by another 18–24%.

Solar-PV & Wind Direct-Coupled SWRO

Developing dynamic frequency-matching high-pressure pumps capable of ramping seamlessly with intermittent renewable micro-grids without triggering membrane compaction or osmotic collapse, eliminating battery reliance.

AI Predictive Fouling Algorithms

Cloud-integrated edge controllers track real-time differential pressure (dP), temperature, normalized permeate flux, and raw feed SDI, deploying proactive CIP (Clean-In-Place) flushing cycles before irreversible foulant cake layers form.

Global Assurance

Global Commissioning, Local Compliance & Field Support

Bridging Chinese engineering capacity with localized regulatory frameworks, field installation services, and rapid spare-parts distribution.

Regulatory Certification & Traceability

From raw material 3.1 Mill Test Certificates (MTC) to non-destructive weld testing (NDT/RT), full electrical schematics according to IEC standards, and complete documentation ready for local sanitary authority approvals.

Turnkey EPC Field Supervision

Our senior field commission engineers deploy worldwide to oversee intake subsea pipeline anchoring, high-voltage electrical hookup, membrane loading, CIP sanitization, and localized operator training.

Global Spare Parts Lifecycle

We stock critical operational spares—such as high-pressure seals, ERD cartridge bearings, high-rejection SWRO membranes, and dosing pumps—with fast international air-courier dispatch within 48 hours.

Specialized Systems

High-Salinity, Concentration & Modular Desalting Range

Advanced zero-liquid discharge, fracturing fluid reuse, and specialized compact desalination solutions for heavy operations.

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Direct Consultation

Frequently Asked Questions: Industrial Procurement & Engineering

Clear, unhedged technical responses to critical operational, commercial, and engineering questions.

How does a modern SWRO factory reliably turn salt water into verified drinking water?

Turning seawater into drinking water involves a multi-barrier physical and chemical process. Raw seawater undergoes coagulant dosing and primary filtration (media or ultrafiltration) to lower the Silt Density Index (SDI < 3.0). High-pressure pumps drive the clarified brine through thin-film composite polyamide membranes at pressures up to 65–80 bar, forcing freshwater across the osmotic barrier while rejecting 99.5%–99.8% of dissolved salts. Finally, permeate undergoes post-treatment—including remineralization with calcite filters, pH adjustment, and chlorine/UV disinfection—to ensure full potability meeting international WHO standards.

What raw water analysis data is required to generate an engineered design?

To properly size membranes, pump metallurgy, and chemical pretreatment, we require: Total Dissolved Solids (TDS), electrical conductivity, ionic breakdown (specifically Chloride, Sodium, Sulfate, Calcium, Magnesium, Barium, Strontium, and Boron), total iron and manganese, turbidity, seasonal temperature fluctuations, total organic carbon (TOC), and SDI. Additionally, site details like electrical supply parameters (e.g., 380V/440V/480V 50/60Hz) and footprint limits ensure precision skid fabrication.

How do Chinese manufacturers address metallurgy risks in harsh marine environments?

High chloride concentrations cause severe pitting and crevice corrosion in standard stainless steels. Tongjie implements a strict metallurgy zoning strategy: low-pressure raw water circuits utilize UPVC, CPVC, or FRP; high-pressure manifolds contacting untreated seawater are built from Duplex 2205 or Super Duplex 2507 (PREn > 42); permeate lines handling pure water utilize SS316L or food-grade HDPE. All welds undergo automated orbital inert gas purging and pickling/passivation baths.

What energy recovery systems are integrated to minimize power consumption?

Energy represents up to 50% of the operational expenditure in seawater desalination. We engineer plants using positive-displacement isobaric energy recovery devices (such as ceramic rotary pressure exchangers). These capture the hydraulic energy of the high-pressure concentrate stream and transfer it directly to incoming feed water with up to 96–97% efficiency, cutting specific power consumption to as low as 2.2–2.8 kWh/m³.

What is the typical fabrication, testing, and delivery lead time?

Standard containerized systems (100–1,000 m³/day) feature modular, standardized footprints that allow full factory assembly, instrumentation wiring, and wet FAT testing within 45 to 60 days. Custom industrial skids or larger multi-megawatt configurations generally require 90 to 120 days. Equipment ships via Shanghai's deep-water port in ISO sea containers or flat-rack enclosures.

Does Shanghai Tongjie support third-party inspection agencies prior to export?

Yes. We frequently host global inspection agencies—including SGS, Bureau Veritas (BV), TÜV Rheinland, and DNV—at our Shanghai facility. We coordinate full witness audits covering dimensional accuracy, raw material mill certificates, hydraulic pressure testing, electrical megger testing, PLC dry-run simulations, and water quality testing during complete FAT procedures.