Primary Modular Systems
Advanced Water Treatment & Desalination Machinery
Engineered to exact raw water chemical compositions: low-energy brackish and seawater desalination, EDI ultrapure production, and high-salinity brine recovery skids.
CE Certification China Suppliers Factory Ultra-Pure Water System for Semiconductor & Microelectronics Manufacturing - 18.2 MΩ·cm Resistivity Suppliers, Manufacturer
Inspect Specifications
China China ODM Suppliers: Eco-Friendly Water Treatment Solutions from a Leading Factory Factory, Supplier
Inspect Specifications
Wholesale China Industrial Demineralized Water Equipment Factory - RO + EDI Suppliers for High-Quality Water Solutions Factory, Manufacturer
Inspect Specifications
China Deoxygenation Membrane Equipment Suppliers and Factory in China for Effective Water Treatment Solutions Suppliers, Supplier
Inspect Specifications
ODM High-Pressure Membrane Concentration System for High-Salinity Wastewater - China Suppliers & Factory Solutions Factories, Manufacturers
Inspect Specifications
ODM High Salinity Brine Concentration System - OARO Technology by China Suppliers and Factory for ZLD Treatment Factory, Supplier
Inspect Specifications
CE Certification High Salinity Brine Concentration System | OARO Technology from China Suppliers & Factory for ZLD Treatment Factories, Manufacturers
Inspect Specifications
Global Macro Paradigm
Industrial Scale Desalination: Global Security & Economics
The transformation of coastal, island, and industrial water reserves through modern membrane separation science and modular engineering architectures.
Global freshwater scarcity is no longer an isolated regional hardship; it has emerged as a fundamental operational risk for industrial manufacturing, energy production, and municipal stability. According to United Nations World Water Development reports, over two billion people live in countries experiencing high water stress. Against this backdrop, the global commercial sector has fundamentally pivoted from thermal evaporation methodologies—such as Multi-Stage Flash (MSF) and Multiple-Effect Distillation (MED)—to high-efficiency, membrane-based Seawater Reverse Osmosis (SWRO) systems. This transition is driven by a massive reduction in specific energy consumption (SEC), falling from over 10–15 kWh/m³ in thermal processes to below 2.5–3.5 kWh/m³ in modern SWRO plants equipped with isobaric energy recovery devices (ERDs).
As an authoritative OEM salt water into drinking water supplier, Shanghai Tongjie Environmental Protection Technology Co., Ltd. (established in 2010) addresses this global landscape by bridging the critical divide between bespoke process design and serial manufacturing scalability. By centralizing research, proprietary pressure vessel fabrication, modular skid assembly, and rigorous wet testing in Shanghai, we eliminate procurement fragmentation for EPC contractors and municipal developers across the Middle East, North Africa, Latin America, and Southeast Asia.
Information Gain Engineering Directive: The true levelized cost of water (LCOW) is determined not merely by membrane capital expenditure, but by thermodynamic recovery limits, anti-fouling operational thresholds, and lifecycle membrane replacement frequency. Tongjie containerized plants integrate digital twin flux optimization to consistently maintain LCOW below $0.65–$0.85 per cubic meter under standard seawater salinity (35,000 mg/L TDS).
17+
Years Engineering Heritage
38+
Patents & Proprietary Claims
<2.8
kWh/m³ Specific Energy Level
1000+
Global Deployed Operations
Decentralized Infrastructure
Rapid growth in coastal urbanization, mega-resorts, and offshore operations demands decentralized containerized SWRO units that bypass multi-year civil works and eliminate distribution grid water losses.
CAPEX to OPEX Optimization
Integrating high-efficiency positive displacement and centrifugal high-pressure pumps with rotary isobaric energy recovery achieves over 97% kinetic energy transfer from reject brine streams directly back into the feed.
Direct Renewable Hybridization
Off-grid photovoltaic (PV) and microgrid-coupled desalination plants are engineered to accommodate diurnal power swings through variable-frequency drives (VFD) and automated throttling without damaging membrane arrays.
Process Train Engineering
The 5-Stage Engineering Train: Raw Seawater to Potable Water
A comprehensive examination of hydrodynamic, chemical, and physical separation stages within Tongjie's containerized and skid-mounted OEM desalination systems.
01
Intake & DAF Clarification
Subsurface beach well or open intake with automatic wedge wire screening, followed by optional Dissolved Air Flotation (DAF) to handle algae blooms, red tides, and oil hydrocarbons.
02
Integrated UF Pretreatment
Pressurized PVDF ultrafiltration hollow-fiber modules (0.02 µm nominal pore size) reduce raw water Silt Density Index (SDI₁₅) to <2.5 and turbidity to <0.1 NTU, shielding RO membranes.
03
High-Pressure Desalination
Duplex (2205) / Super Duplex (2507) high-pressure pumps elevate feed stream to 55–75 bar through polyamide thin-film composite (TFC) membrane elements with 99.8% nominal NaCl rejection.
04
Isobaric Energy Recovery
Rotary pressure exchangers capture hydraulic energy from the concentrated reject brine stream and pressurize an equal volume of feed water at 96–98% net hydrodynamic efficiency.
05
Remineralization & UV
Permeate calcite contactor filtration balances pH, calcium hardness, and alkalinity to prevent distribution piping corrosion, followed by inline UV disinfection and residual chlorination.
Industrial desalination demands meticulous attention to chemical dosing and hydraulic balance. Upstream of the membrane arrays, Tongjie integrates automated dosing skids for scale inhibitors (phosphonate-free formulations for environmental sensitivity), sodium bisulfite (SBS) for active dechlorination, and biocides under automated Oxidation-Reduction Potential (ORP) control loops. Membrane flux rates are calculated at a conservative 12–15 LMH (liters per meter squared per hour) under harsh warm seawater conditions (>30°C) to prevent irreversible colloidal compaction and scaling.
Compliance & Standards
Global Regulatory Compliance & Localized Support
Ensuring every system satisfies destination-market potable health regulations, environmental discharge thresholds, and pressure vessel engineering codes.
WHO Potable Guidelines
Product water conforms strictly with the World Health Organization (WHO) Guidelines for Drinking-water Quality (4th Edition), US EPA Safe Drinking Water Act (SDWA), and EU Directive 2020/2184, guaranteeing TDS <300 mg/L and Boron <0.5 mg/L.
ASME & CE Pressure Integrity
High-pressure pipe spools, couplings, and fiber-reinforced polymer (FRP) membrane pressure vessels comply with ASME Boiler and Pressure Vessel Code (BPVC Section X) and European Pressure Equipment Directive (PED 2014/68/EU) CE certifications.
IoT Remote Diagnostics
Tongjie integrates edge-computing industrial PLCs (Siemens S7-1500 or Allen-Bradley GuardLogix) linked to cellular and satellite telemetry. Real-time normalized permeate flux, differential pressures, and salt passage rates are visible 24/7 globally.
Factory Acceptance Testing (FAT) Authority: Every OEM containerized system fabricated at Tongjie’s Shanghai facility undergoes comprehensive hydrodynamic pressure testing and simulated wet testing utilizing high-salinity sodium chloride/magnesium sulfate test water prior to export packing. Complete dossiers—including material test reports (MTR 3.1), radiographic weld inspections, hydrostatic test charts, instrument calibration sheets, and O&M manuals—are provided to support local municipal permitting.
Real-World Applications
Mission-Critical Deployment Scenarios
From isolated island resorts to heavy coastal industrial complexes, Tongjie’s customized OEM systems deliver continuous, resilient potable water security.
Remote Islands & Eco-Tourism Resorts
In environments such as the Maldives, the Caribbean, and the South China Sea, freshwater supply is critical to operations. Tongjie supplies containerized, sound-dampened SWRO systems (<72 dB(A) acoustic insulation) operating with variable power inputs. Integrated energy recovery devices minimize generator load, while secondary mineralization ensures soft, highly palatable drinking water matching global luxury hospitality standards.
Offshore Platforms, FPSO & Marine Operations
Marine environments require high corrosion resistance. Tongjie constructs explosion-proof (ATEX/IECEx compliant) skid-mounted seawater desalination systems utilizing 254SMO, Duplex 2205, and Super Duplex 2507 wetted piping. Engineered for ultra-compact footprints, these skids provide technical boiler feed water and human consumption potable streams for drilling crews.
Coastal Power, Refineries & Green Hydrogen
Modern coastal mega-facilities require millions of gallons of water daily for cooling towers, high-pressure steam boilers, and green hydrogen proton exchange membrane (PEM) electrolyzers. Tongjie’s hybrid SWRO + EDI systems take raw seawater, eliminate thermal discharge problems, and generate both potable water and demineralized water (resistivity >16 MΩ·cm) simultaneously.
Emergency Humanitarian Aid & Disaster Relief
When natural catastrophes, tsunamis, or contamination events sever conventional aqueducts, Tongjie’s air-transportable, containerized SWRO units deploy via standard cargo aircraft or flatbed trucks. Equipped with onboard diesel generators and rapid intake systems, these units produce certified WHO-grade drinking water within 2 hours of arrival on site.
Forward Engineering Horizon
Technical Roadmap: Next-Gen Desalination Tech
Continuous investment in cutting-edge materials science, zero liquid discharge integration, and machine-learning membrane flux automation.
The trajectory of industrial desalination is defined by the quest for thermodynamic efficiency and environmental circularity. Conventional SWRO approaches thermodynamic limits; therefore, Tongjie’s R&D engineering center focuses on three pioneering technological vectors:
Biomimetic Aquaporin Membranes
Integrating natural water-channel proteins (aquaporins) into thin-film nanocomposite (TFN) matrices to dramatically heighten water permeability while rejecting trace boron, micropollutants, and silica at lower operational feed pressures.
OARO & Near-ZLD Integration
Osmotically Assisted Reverse Osmosis (OARO) and Disc Tube Reverse Osmosis (DTRO) push brine concentration beyond 120,000 mg/L TDS, minimizing brine disposal volumes and enabling high-efficiency salt recovery.
AI Dynamic Flux Balance
Proprietary neural-network predictive algorithms analyze raw water seasonal temperatures, bio-turbidity indices, and scaling potentials in real time, automatically shifting VFD pump speeds and recovery ratios before fouling occurs.
Technical Clarifications
Frequently Asked Technical Questions
Key process, procurement, and engineering answers compiled by Tongjie’s chief water treatment engineers.
Boron in natural seawater typically ranges from 4.0 to 6.5 mg/L, existing as uncharged boric acid (B(OH)₃) at ambient pH, which readily passes through standard polyamide membranes. Tongjie implements a specialized two-pass SWRO configuration or a partial second pass. In the second pass, feed water pH is elevated to ~9.5–10.0 using caustic soda dosing, converting boric acid into charged borate ions (B(OH)₄⁻), which TFC membranes reject at rates exceeding 96%. This guarantees final product water boron levels strictly below 0.5 mg/L, meeting WHO and EU drinking water thresholds.
To combat severe crevice and pitting corrosion associated with seawater chloride concentrations exceeding 20,000 mg/L under pressures up to 80 bar, Tongjie strictly rejects standard 304 or 316L stainless steel for high-pressure wetted service. We engineer all high-pressure manifolds, pump heads, and valve bodies in Super Duplex Stainless Steel (UNS S32750 / EN 1.4410 / 2507) or Duplex 2205, with Pitting Resistance Equivalent Numbers (PREN) >42. Low-pressure suction piping is constructed from heavy-wall Sch 80 PVC, PVDF, or marine-grade GRP.
With Tongjie’s integrated ultrafiltration (UF) pretreatment, automatic low-pressure permeate flushing during shutdowns, and scheduled Clean-In-Place (CIP) cycles, our industrial SWRO membrane elements routinely achieve operational lifespans of 5 to 7 years. Membrane life is preserved by maintaining a continuous feed SDI₁₅ below 2.5, preventing chlorine oxidation through online ORP interlocks, and utilizing anti-scalants that halt calcium carbonate and barium sulfate crystal formation.
Yes. As a dedicated OEM/ODM manufacturer, Tongjie supplies skid-mounted and containerized water systems with custom corporate branding, tailored HMI interface designs, client-specific paint/enamel coatings (including C5-M marine-grade offshore paint systems), and native software architecture built on Siemens WinCC, Allen-Bradley FactoryTalk, or Schneider EcoStruxure platforms, alongside neutral or private-labeled engineering manuals.
Because all internal piping, cable trays, instrument calibrations, and PLC I/O functional checks are fully completed and wet-tested in our Shanghai factory prior to export shipping, on-site commissioning is exceptionally fast. Once lowered onto a level concrete slab or compacted foundation, the unit requires only connection of raw seawater intake piping, concentrated brine discharge, clean permeate delivery lines, and the main 3-phase electrical feed. Potable water delivery typically begins within 48 to 72 hours of arrival.
Complete Equipment Catalog
Engineered Industrial Portfolio
Additional specialized water processing, produced water reuse, zero liquid discharge, and precision membrane manufacturing systems from our Shanghai factory.
China OEM Precision Manufacturing in China: Leading Suppliers & Factory for Customized Environmental Water Treatment Solutions Suppliers, Manufacturer
Inspect Specifications
CE Certification Containerized Seawater Desalination Plants Supplier, Manufacturer
Inspect Specifications
CE Certification China Suppliers Factory Electronic Ultra-Pure Water System for Semiconductor & Microelectronics with 18.2 MΩ·cm Resistivity Factories, Manufacturer
Inspect Specifications
China China Suppliers of Containerized Seawater Desalination Plants - Factory-Integrated Mobile Solutions for Water Needs Suppliers, Supplier
Inspect Specifications
China Eco-Friendly Water Treatment Solutions: ODM Services by China Suppliers & Factory for Global Brands Suppliers, Supplier
Inspect Specifications
Wholesale China Ultra-Pure Water System for Semiconductor & Electronics | Top Suppliers & Factory Quality Solutions Suppliers, Manufacturers
Inspect Specifications
OEM High-Ratio Water Reuse Equipment - Ultrafiltration & Reverse Osmosis by China Suppliers and Factory Suppliers, Supplier
Inspect Specifications
CE Certification China Fracturing Flowback Fluid Treatment System by Suppliers and Factory for Zero-Discharge Reuse Factory, Suppliers
Inspect SpecificationsRequest an Engineered Process Simulation & Mass Balance
Provide your raw seawater chemical assay (TDS, temperature, turbidity, boron, SDI), required daily potable output (m³/day), and site power constraints. Tongjie's licensed chemical engineering team will generate a preliminary process design, membrane projection, P&ID overview, and equipment bill of materials within 48 hours.