ISO 9001 / CE Certified • 38+ National Patents

Wholesale Seawater Reverse Osmosis System Supplier & Manufacturers

Engineering high-recovery containerized SWRO desalination plants, modular industrial pure water skids, and zero liquid discharge (ZLD) architectures engineered for global coastal utilities, EPC contractors, and marine infrastructure.

Direct Factory Wholesale Showcase

Featured Industrial Membrane Systems • Batch 01

Factory-assembled, skid-mounted, and containerized reverse osmosis and wastewater treatment systems ready for rapid global deployment and plug-and-play commissioning.

Wholesale Deoxygenation Membrane Equipment Suppliers in China

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China High-Efficiency Brine Concentration System

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China Eco-Friendly Water Treatment Solutions ODM

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OEM China Suppliers Factory Purified Water System

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China ODM Suppliers Eco-Friendly Solutions

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China Factory Fracturing Flowback Water Reuse Equipment

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ODM OEM Precision Manufacturing China Suppliers

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Authority & Proven Track Record

Engineering Integrity Backed by Shanghai Tongjie Technology

Founded in 2010, Shanghai Tongjie Environmental Protection Technology Co., Ltd. is a recognized National High-Tech Enterprise and Shanghai Specialized & Sophisticated Enterprise. With unified R&D, precision manufacturing, and project execution under one roof, we eliminate intermediate risks for overseas procurement teams.

17+

Years Engineering Experience

38+

Invention & Utility Patents

50+

R&D Water Specialists

1000+

Global Industrial Installations

Dual Class II Engineering Qualifications

Certified by the Ministry of Housing and Urban-Rural Development for Environmental Protection Engineering and Mechanical & Electrical Installation Contracting.

  • Direct oversight on high-pressure piping & skids
  • In-house pressure vessel welding validation
  • Complete mechanical integrity certification

Rigorous QA/QC & CE Export Standards

Our manufacturing protocols align with ISO 9001, ISO 14001, and ISO 45001 international standards alongside European CE conformity for machinery and pressure equipment.

  • 100% Factory Acceptance Testing (FAT) before dispatch
  • Hydrostatic pressure tests up to 100 bar on SWRO manifolds
  • Comprehensive material traceability reports (MTR)

Proprietary Automation & SCADA Code

We own independent software copyrights for intelligent desalination operation, anti-scaling chemical pacing, and energy recovery optimization algorithms.

  • Siemens & Allen-Bradley PLC programmable frameworks
  • Automated CIP (Clean-In-Place) sequencing
  • Cloud-based remote telemetry & fault diagnosis
Next-Generation Desalination Paradigms

Technical Roadmap & Future Horizons in SWRO

Modern Seawater Reverse Osmosis engineering has evolved beyond brute-force high-pressure filtration. Our R&D roadmaps focus on maximizing specific thermodynamic efficiency, pushing membrane recovery ceilings, and deploying autonomous edge computing.

Isobaric Energy Recovery (ERD) Evolution

Standard SWRO demands severe hydraulic power to exceed natural osmotic pressures of 25–30 bar. We engineer systems with isobaric pressure exchangers (PX) that recover up to 98% of the high-pressure concentrate energy, drastically lowering Specific Energy Consumption (SEC) to below 2.8–3.2 kWh/m³.

  • Direct ceramic rotor pressure exchangers
  • Hydraulic auxiliary booster pump synchronization
  • Life-cycle electrical operating cost slashed by 55%

AI-Driven Digital Twins & Predictive CIP

By pairing IoT pressure transmitters and conductivity probes with machine-learning algorithms, our smart control panels track normalized permeate flux and salt passage in real time, projecting biofouling curves before pressure differentials degrade membrane life.

  • Dynamic chemical antiscalant dosing optimization
  • Automated clean-in-place (CIP) scheduling
  • Continuous membrane health degradation tracking

OARO & Ultra-High Pressure RO (UHPRO)

Pushing past the conventional 80-bar SWRO limit, our Osmosis-Assisted Reverse Osmosis (OARO) and 120-bar UHPRO trains facilitate extreme brine concentration. This closes the gap between seawater desalination and Zero Liquid Discharge (ZLD) crystallization.

  • Reduces downstream thermal evaporation volume by 70%
  • Concentrates TDS up to 130,000–180,000 mg/L
  • Patented hydraulic membrane channel configurations
Global Operational Footprint

Macro Industry Solutions: Customized Process Architectures

Every coastal geography and industrial process carries distinct feed water chemistry. Tongjie engineers bespoke process trains addressing specific dissolved ions, boron thresholds, temperature swings, and industrial reuse targets.

Coastal Utilities & Potable Municipal Grids

Turnkey seawater desalination plants engineered to supply municipal potable water grids in compliance with WHO drinking water standards. Dual-pass configurations enforce stringent boron rejection (<0.5 mg/L) and include post-treatment calcite re-hardening and disinfection.

  • Capacities from 500 m³/day to 50,000 m³/day
  • Integrated remineralization & pH stabilization
  • Multi-barrier ultrafiltration (UF) pretreatment

Offshore Platforms, Marine & Remote Islands

Standardized 20ft and 40ft High-Cube containerized SWRO units built with heavy-duty structural frames, specialized C5M marine coatings, and Super Duplex 2507 metallurgy to withstand aggressive ocean spray, high humidity, and extreme salinity shifts.

  • Pre-wired, pre-piped, plug-and-play field setup
  • Operates reliably up to 45,000 ppm TDS seawater
  • Unmanned automation with remote GSM/Satellite links

Green Hydrogen Electrolyzer Water Feed

Green hydrogen production via PEM and Alkaline electrolyzers demands demineralized water with electrical conductivity below 0.1 μS/cm. Our hybrid SWRO + Two-Pass Brackish RO + Continuous Electrodeionization (EDI) systems deliver high-purity water directly from the sea.

  • Conductivity: <0.055 μS/cm (Resistivity 18.2 MΩ·cm)
  • Zero chemical regeneration footprint via EDI
  • Integrates directly with coastal offshore wind/solar arrays

Mining, Lithium Brine & Industrial Zero Discharge

High-salinity effluent from lithium extraction, petrochemical processing, and coal-chemical operations requires rugged separation. Tongjie disc-tube RO (DTRO) and OARO plants recover valuable minerals and concentrate waste brine for mechanical vapor recompression.

  • DTRO channels eliminate spiral-wound fouling risks
  • 90%+ total industrial water recovery rates achieved
  • Crystallization integration for pure dry-salt cake

Oilfield Produced Water & Fracturing Flowback

Engineered specifically for heavy oil recovery and shale fracturing operations. Combining chemical softening, coalescing oil removal, and multi-stage DTRO, our mobile plants reduce oil content to ≤5 mg/L and TSS to ≤1 mg/L for reinjection compliance.

  • Commissioning completed within 15 days on-site
  • Tested extensively across Central Asia & Middle East fields
  • Explosion-proof ATEX/IECEx skid electrical options

Food, Beverage & Pharma Pure Process Water

Ultra-sanitary water treatment plants engineered for food manufacturing, dairy processing, and API formulations. Features sanitary 316L stainless steel piping, orbital weld endoscopy, and comprehensive DQ/IQ/OQ validation dossier support.

  • Continuous TOC & microbial bioburden control
  • Hot-water sanitizable RO and EDI module arrays
  • Meets global pharmacopeia (USP & EP) purity standards
Smart Manufacturing & Global Integration

China Factory 4.0: Supply Chain Resilience & Precision

Located at No. 1980 Waiqian Highway in Shanghai's Jiading Industrial District, Tongjie combines Chinese advanced fabrication speed and structural cost advantages with world-class critical component integrations.

Super Duplex 2507 Welding

High-salinity seawater causes swift pitting in low-grade alloys. Our ASME-certified welders utilize automated orbital TIG procedures for Super Duplex (PREN > 42) and SMO 254 piping manifolds.

Tier-1 Core Components

We standardize on premium international components: DuPont FilmTec & Toray SWRO membranes, Danfoss APP / FEDCO high-pressure pumps, and ERI PX energy recovery modules.

Full Hydraulic FAT Bay

Our Shanghai factory houses a simulated seawater test bay where every skid undergoes 72 hours of continuous hydraulic pressure and membrane rejection testing before packing and crating.

Container Prefabrication

Insulated shipping containers equipped with industrial HVAC, overhead gantry hoists, LED explosion-proof lighting, and slip-resistant checkered decking arrive ready to plug in.

Predictable Project Execution

How We Deliver Global Projects: Step-by-Step Delivery Gate

For international EPC contractors and plant directors, transparency eliminates risk. Every Tongjie project follows a deterministic five-phase validation methodology with clear documentation deliverables at each milestone.

01

Feed Water Analysis

Comprehensive profiling of TDS, SDI15, Turbidity, Hardness, Silica, Boron, and seasonal seawater temperature fluctuations.

02

Process Design

WAVE & ROSA projection modeling, mass-energy balances, 3D piping routing, and instrument datasheets reviewed with the client.

03

Fabrication & FAT

Precision skid fabrication in Shanghai, orbital welding X-ray inspections, and 100% full-load hydraulic FAT testing bay sign-off.

04

Export Logistics

Seaworthy vacuum packaging, ISPM-15 export wooden crating or containerized delivery directly from Shanghai Port.

05

Commissioning

Field engineer dispatch or remote augmented-reality guided commissioning, operator training, and 24/7 telemetry activation.

Trusted Worldwide

Trusted by Industrial Owners, EPCs & Global Utilities

Long-term strategic relationships across chemical, mining, municipal, energy, and marine infrastructure worldwide.

Commercial & Engineering Assurance

Global Enterprise Procurement: Capex, Opex & Compliance

When multinational procurement departments, BOT concessions, and Tier-1 EPC contractors evaluate wholesale SWRO equipment manufacturers, equipment reliability and lifecycle operating expenditure dominate decision criteria.

Capex vs. Opex Optimization

Standard commercial systems often cut Capex by omitting energy recovery or under-sizing membrane surface area, driving operating power costs skyward. Tongjie runs 20-year net-present-value (NPV) lifecycle analyses to balance membrane flux rates against pump power draw.

  • Lowers flux rates (12–14 LMH) to prevent premature fouling
  • Energy consumption kept below 3.0 kWh/m³ for typical seawater
  • Antiscalant consumption minimized via precise titration dosing

Modular Container vs. Civil Footprint

Civil plant erection requires long permitting cycles, complex cast-in-place concrete basins, and extensive on-site workforce overheads. Our containerized SWRO solutions compress schedules from years into weeks.

  • Intermodal freight compliant (20ft, 40ft High-Cube)
  • No extensive civil foundation requirements
  • Relocatable asset for temporary mining camps or crisis response

Global Engineering Compliance Dossier

To satisfy stringent third-party insurance inspectors and utility client auditors, all Tongjie SWRO skids arrive with exhaustive engineering data binders.

  • P&ID, General Arrangement (GA) in AutoCAD and BIM Revit
  • Full electrical single-line diagrams (SLD) & I/O lists
  • Pressure vessel ASME Section VIII code stamp certification
Engineering Knowledge Base

Technical & Procurement FAQ: Direct Answers from Engineers

Clear, uncompromising engineering data addressing membrane physics, metallurgical selection, fouling indexes, and overseas procurement logistics.

What exact raw water parameters are needed to accurately size a seawater RO system?
To generate a validated process proposal and membrane mass-balance simulation (via WAVE, ROSA, or TorayDS), our engineering team requires a comprehensive laboratory analysis including: Total Dissolved Solids (TDS) or electrical conductivity, feed temperature minimum/maximum ranges, Silt Density Index (SDI15) or turbidity, pH, total hardness (Ca2+, Mg2+), silica (SiO2), barium/strontium, iron, manganese, and hydrogen sulfide levels. If intake is open-ocean rather than beach-well, we also require seasonal chlorophyll-A and total organic carbon (TOC) levels to determine whether multi-media sand filtration or pressurized ultrafiltration (UF) is mandatory for membrane protection.
Why is the recovery rate of Seawater RO generally capped between 40% and 45%?
Typical seawater has a TDS of 35,000 to 45,000 mg/L, corresponding to an initial osmotic pressure of approximately 28 to 35 bar. As fresh water is extracted through the membrane barrier, the reject concentrate stream doubles in salinity at 50% recovery (reaching 70,000–90,000 mg/L TDS). At this point, the required net driving pressure exceeds 70–80 bar, approaching standard fiberglass pressure vessel rating limits and exponentially multiplying energy draw while elevating the risk of irreversible calcium sulfate and silica scale precipitation. For standard single-stage SWRO, 40%–45% represents the thermodynamic sweet spot of lowest lifecycle cost per cubic meter.
How does Tongjie eliminate boron to meet WHO drinking water standards (<0.5 mg/L)?
Naturally occurring boron in seawater is primarily present as uncharged, neutral boric acid [B(OH)3], which easily permeates through standard thin-film composite reverse osmosis membranes. At normal seawater pH (7.8–8.2), single-pass rejection of boron is only 80%–88%, leaving permeate boron levels at 1.0–1.8 mg/L. Tongjie resolves this by incorporating a partial or full Second-Pass Brackish RO system with upstream caustic soda (NaOH) dosing to elevate the first-pass permeate pH above 9.5–10.0. At high pH, boric acid dissociates into negatively charged borate ions [B(OH)4-], which the second-pass polyamide membrane rejects at >98%, safely reducing permeate boron concentrations to below 0.3–0.5 mg/L.
What high-pressure metallurgy is employed to counter pitting corrosion in seawater?
High chloride concentrations and dissolved oxygen make standard 304 or 316L stainless steel highly vulnerable to severe crevice corrosion and pitting under 60–80 bar operating pressures. Tongjie specifies Super Duplex Stainless Steel 2507 (UNS S32750 / 1.4410) or 254 SMO (6% Molybdenum alloy, UNS S31254) for all high-pressure piping manifolds, check valves, and high-pressure pump wetted parts. These super-austenitic and super-duplex alloys offer a Pitting Resistance Equivalent Number (PREN) exceeding 42, ensuring decade-long corrosion immunity. All low-pressure piping is executed in heavy-duty schedule 80 PVC, CPVC, or Super Duplex.
What is the actual Specific Energy Consumption (SEC) of Tongjie containerized plants?
Without energy recovery devices, conventional SWRO draws between 6.5 and 8.0 kWh per cubic meter of produced water. All Tongjie commercial and municipal SWRO plants incorporate high-efficiency isobaric energy recovery devices (ERI PX Pressure Exchangers or Danfoss iSave systems). By capturing hydraulic energy from the high-pressure concentrate discharge and transferring it directly to the feed stream with 96%–98% mechanical efficiency, our containerized plants operate at an industry-leading specific energy consumption of only 2.8 to 3.4 kWh/m³ (tested on 35,000 ppm TDS seawater at 25°C).
Can your systems treat fracturing flowback and heavy oil produced water?
Yes. Oilfield produced water contains emulsified hydrocarbons, heavy suspended solids, and high mineral hardness that would irreversibly foul standard spiral-wound membranes within hours. Tongjie utilizes an integrated pretreatment train consisting of micro-bubble flotation, ceramic coalescing filters, and Disc Tube Reverse Osmosis (DTRO) or tubular membrane modules. The open-channel hydrodynamics of our DTRO modules allow fluid velocity to scour membrane surfaces continuously, operating reliably with feed oil content up to 10–20 mg/L and delivering reinjection effluent with oil ≤5 mg/L and suspended solids ≤1 mg/L.
What certifications and quality inspection documents accompany export shipments?
Every shipment from our Shanghai facility is backed by a full Quality Assurance binder containing: CE Machinery Directive (2006/42/EC) and Low Voltage Directive (2014/35/EU) certificates of conformity; ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 audit records; EN 10204 3.1 Material Test Reports (MTR) for all metallic pressure parts; hydro-static pressure test logs signed by QA managers; electrical calibration and megger test logs; and comprehensive bilingual O&M manuals with wiring schematics and spare parts catalogs.
How does Tongjie support overseas commissioning and emergency spare parts?
Tongjie provides two tiers of commissioning: Tier 1 consists of on-site dispatch of experienced mechanical and electrical commissioning engineers to lead field integration, load testing, and local staff operational training. Tier 2 leverages our integrated 4G/5G/Satellite cloud telemetry routers for real-time remote-guided start-up. In addition, every system ships with a 2-year operational consumable package (cartridge filters, mechanical seals, O-rings, pressure transmitter sensors, and cleaning chemicals), supported by emergency air-freight dispatch agreements from Shanghai.
Complete Equipment Catalog

Featured Industrial Membrane Systems • Batch 02

High-salinity brine concentration, ultrapure water production, demineralization, and zero-discharge industrial assemblies from Tongjie manufacturing lines.

CE Certification China Suppliers Industrial Demineralized Water Equipment

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ODM High-Salinity Wastewater Treatment System for ZLD

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CE Certification High Salinity Brine Concentration System OARO Technology

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China Factory-Integrated Containerized Seawater Desalination Plants

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China High-Efficiency Brine Concentration Systems for ZLD

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CE Certification China Oilfield Fracturing Flowback Fluid Treatment System

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CE Certification Osmosis-Assisted Reverse Osmosis Factory

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CE Certification Electronic Ultra-Pure Water System for Semiconductor

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Direct Factory Engagement

Send Your Water Analysis Report. Receive an Engineered Process Proposal.

Direct communication with Shanghai Tongjie senior process application engineers. We return comprehensive membrane projections (flux, recovery, anti-scalant dosage, and SEC power balance) within 24 to 48 hours for your specific project water conditions.

Request Engineering Proposal
Direct Engineering Line: +86 136 7199 9290
Engineering Desk: [email protected]
WhatsApp Hotline: +86 136 7199 9290
Facility: No. 1980 Waiqian Highway, Jiading District, Shanghai, China