Industrial Water Engineering Whitepaper

China Converting Ocean Water Into Drinking Water Factory & Manufacturers

Next-Generation SWRO Engineering, Intelligent Energy Recovery Devices, and Industrial Membrane Solutions for High-Capacity Water Production

Direct OEM / ODM Marine Equipment

Engineered Seawater Desalination & Purified Water Systems

Browse factory-direct configurations built to international municipal and industrial purity standards. Each unit is pre-assembled, skid-mounted, and tested for immediate plug-and-play field deployment.

Global Landscape & Economics

Converting Ocean Water Into Drinking Water: The Paradigm Shift

Global water stress, driven by aquifer depletion and rapid industrial expansion along coastal economic corridors, has transformed seawater desalination from an emergency backup measure into an indispensable municipal and industrial baseline utility. Modern seawater reverse osmosis (SWRO) facilities represent the pinnacle of chemical separation engineering.

Thermodynamic Energy Optimization

Through the deployment of isobaric pressure exchangers (ERDs) and high-efficiency variable-frequency drive (VFD) positive displacement pumps, contemporary SWRO systems have reduced energy consumption from historically punitive levels of >8 kWh/m³ down to an economically competitive 2.8 – 3.5 kWh/m³.

Polyamide Thin-Film Nanotechnology

Cross-linked aromatic polyamide composite membranes demonstrate salt rejection rates exceeding 99.85%. Advanced surface modifications inhibit bio-fouling and colloidal deposition, guaranteeing multi-year structural integrity even under harsh hyper-saline oceanic conditions with Total Dissolved Solids (TDS) exceeding 45,000 ppm.

Decentralized & Modular Footprints

The global municipal paradigm is rapidly shifting away from multi-billion dollar centralized civil structures toward agile, containerized modules. Prefabricated container systems slash onsite engineering lead times by 70%, allowing island resorts, mining enclaves, and naval stations to establish secure drinking water networks.

Mission-Critical Engineering

Targeted Localization & Challenging Environments

Raw marine conditions vary drastically across geographical regions. Sizing a robust desalination train requires precise engineering adjustments tailored directly to oceanic salinity profiles, thermal swings, and local regulatory mandates.

Remote Islands & Coastal Resorts

Isolated hospitality properties and island townships require high acoustic damping, zero vibration transmission, and compact spatial designs. Automated remineralization calcite filters and continuous ultraviolet (UV) sterilization cycles ensure permeate complies rigorously with WHO potability criteria without chemical residue.

Offshore Platforms & Marine Vessels

For naval operations and offshore oil rigs, structural resilience against marine atmospheric corrosion is mandatory. Skid modules are fabricated from Super Duplex Stainless Steel (2507) and 316L, paired with automated fresh-water flushing sequences that stop crystallization during intermittent shutdowns.

Hyper-Saline Industrial Water Intake

Coastal petrochemical, fertilizer, and metallurgical refineries require dual-stream systems: producing potable domestic water for onsite workers alongside high-purity demir water (conductivity < 0.1 µS/cm) for high-pressure boiler feed trains, achieved via secondary pass RO coupled with Continuous Electrodeionization (CEDI).

Industrial Ecosystem

Supply Chain Resilience: The Chinese Manufacturing Advantage

As a National High-Tech Enterprise and Shanghai Specialized & Sophisticated Enterprise, Shanghai Tongjie merges comprehensive digital fabrication with complete vertical integration, providing an unrivaled global competitive edge in cost, build quality, and delivery speed.

17+
Years Engineering Experience
38+
Invention & Utility Patents
50+
R&D Research Specialists
1,000+
Global Industrial Installations

Integrated Precision Machining

We directly control precision welding, laser tube profiling, and pressure vessel manufacturing. With Class II Contracting Qualifications in Environmental Protection Engineering and M&E Installation, structural tolerances are inspected to micro-millimeter precision before assembly.

Factory Acceptance Testing (FAT) Protocol

Every seawater RO container is subjected to rigorous hydraulic pressure testing (up to 120 bar) and raw water simulations in our Shanghai test bay. Data integrity is confirmed before packaging, minimizing on-site commissioning to under 15 days.

Agile OEM/ODM White-Labeling

We provide complete architectural and electrical engineering flexibility for international EPC partners, including PLC logic adaptation (Siemens, Allen-Bradley, Schneider), localized UI language configurations, and tailored physical dimensions.

Forward-Looking Innovation

Technical Roadmap: Next-Generation Desalination Paradigms

To address the environmental challenges of brine discharges and high grid dependencies, our R&D facility in Shanghai is executing an advanced engineering roadmap focusing on sustainability and AI optimization.

Direct Solar & Renewable Integration

Pioneering direct DC-coupled photovoltaic and battery energy storage architectures that dynamically vary high-pressure pump speeds based on solar irradiance curves, achieving 100% off-grid freshwater production for remote equatorial islands.

Predictive AI Flux Control

Integrating machine learning algorithms within our proprietary PLC modules to monitor real-time Silt Density Index (SDI), trans-membrane pressure (TMP), and temperature, allowing automated optimization of chemical dosing and automated backwashing cycles.

Zero Liquid Discharge Brine Mining

Closing the loop by pairing SWRO brine reject with high-pressure Disc Tube Reverse Osmosis (DTRO), Osmosis-Assisted RO (OARO), and mechanical vapor recompression (MVR) crystallization to extract commercial-grade industrial salts.

International Certification & Reliability

Global Compliance, Auditing & Life-Cycle Assurance

Engineering reliable water plants demands stringent compliance with global health, environmental, and mechanical standards. Tongjie guarantees full audit traceability and comprehensive documentation across every delivered vessel.

CE Conformity

Certified under EU Pressure Equipment Directive (PED 2014/68/EU) and Machinery Directive (2006/42/EC), ensuring safe integration into high-specification European projects.

Triple ISO Framework

Certified under ISO 9001:2015 Quality Management, ISO 14001:2015 Environmental Systems, and ISO 45001:2018 Occupational Health & Safety frameworks.

ASME IX & AWS Welding

All high-pressure piping manifolds, super duplex headers, and structural skids undergo x-ray non-destructive weld testing (NDT) according to ASME Section IX codes.

24/7 Global Field Support

Remote SCADA diagnostics allow Shanghai-based lead engineers to troubleshoot field anomalies in real time, backed by global courier networks for rapid spare component dispatch.

Technical Clarity & Sizing Inquiries

Frequently Asked Questions: Industrial Water Conversion

Direct answers to the critical process and logistical questions evaluated by mechanical engineers and municipal procurement officers prior to equipment procurement.

What essential baseline data is required for sizing a municipal-grade seawater reverse osmosis (SWRO) plant?
To generate an accurate process calculation (membrane array balance, pump displacement curves, and energy recovery projection), we require: comprehensive raw seawater water chemistry analysis (Total Dissolved Solids [TDS], conductivity, Silt Density Index [SDI], turbidity, silica, boron, heavy metals, and ambient seasonal temperature ranges), target daily volume (m³/day or GPD), preferred recovery rate (typically 40% – 50% for seawater), onsite electrical supply parameters (Voltage, Hertz, phase), and site spatial layout constraints.
How does the plant tackle corrosive degradation from high marine chlorinity?
High salinity and chloride concentrations cause pitting and crevice corrosion in standard austenitic steels. Tongjie implements a strict metallurgy protocol: low-pressure intake headers are fabricated from chemical-grade UPVC, CPVC, or FRP; high-pressure manifolds operating above 60 bar utilize Super Duplex Stainless Steel (UNS S32750 / 2507) with Pitting Resistance Equivalent Number (PREN) > 42. High-pressure pump wet ends utilize Duplex 2205 or Super Duplex metallurgy with passivation certification.
What post-treatment architecture is employed to render desalinated permeate potable?
Permeate directly emerging from an SWRO membrane possesses low mineral content, slightly acidic pH (due to free dissolved CO₂), and high corrosivity toward traditional municipal distribution pipes. Our post-treatment trains incorporate: air degassing towers to strip excess carbon dioxide, remineralization calcite/dolomite beds to replenish vital calcium and magnesium ions and achieve a balanced Langelier Saturation Index (LSI 0.0 to +0.2), sodium hydroxide (NaOH) pH trim dosing, and residual disinfection via chlorination or high-output ultraviolet (UV) systems.
How rapid is the installation and commissioning cycle for containerized units?
Unlike traditional civil concrete plant construction requiring 18 to 36 months, a containerized seawater desalination system is fully manufactured, assembled, internally wired, and hydrostatically tested inside our Shanghai manufacturing complex within 6 to 10 weeks. Upon arrival at the installation site, the plug-and-play ISO containerized package requires only foundation anchoring, external power cable coupling, raw seawater intake connection, and brine discharge hookup. Complete commissioning and validation are typically completed within 7 to 15 days.
What are the options for brine reject management and environmental stewardship?
To satisfy stringent coastal environmental impact assessments (EIA), Tongjie provides specialized multi-port diffuser designs engineered to accelerate marine brine dilution and prevent localized benthic shock. Furthermore, for inland, zero-discharge, or resource-recovery projects, our engineering teams provide secondary concentration stages utilizing high-pressure Disc Tube Reverse Osmosis (DTRO) and thermal crystallizers (MVR) to achieve Zero Liquid Discharge (ZLD), turning the reject stream into crystallized, transportable dry industrial salts.
Complete Equipment Inventory

High-Performance Separation & Desalination Machinery

Review our high-efficiency deoxygenation membranes, containerized plants, and extreme-pressure concentration technologies available for direct export and turnkey engineering deployment.