OEM SWRO Plant Factory & Turnkey Desalination Suppliers

To accurately design and engineer an SWRO system with our proprietary simulation software, we require: (1) Total Dissolved Solids (TDS) or electrical conductivity; (2) Detailed ionic breakdown including Sodium, Chloride, Calcium, Magnesium, Barium, Strontium, Silica, and Boron; (3) Silt Density Index (SDI15) or Turbidity (NTU); (4) Feedwater temperature variations (minimum, design, and maximum); (5) Total Organic Carbon (TOC) and oil/grease presence; (6) Required permeate output volume (m³/day or GPD) and target water purity specifications (e.g., WHO drinking water, low-boron agricultural use, or demineralized boiler feed).

Boron exists predominantly as uncharged boric acid (B(OH)3) at standard seawater pH (~8.0), making it difficult for standard RO membranes to reject (typical single-pass rejection is only 80-88%). To achieve international drinking standards (≤ 0.5 mg/L boron) or agricultural irrigation limits (≤ 0.3 mg/L), Tongjie implements a multi-stage approach: either utilizing ultra-high rejection seawater membranes with high-flux second-pass brackish membranes, or dosing food-grade caustic soda (NaOH) prior to the second pass to raise the pH above 9.5. This shifts boric acid into the negatively charged borate ion (B(OH)4-), increasing membrane rejection to over 98.5%.

Because our containerized systems are completely skid-mounted, pre-piped, pre-wired, and wet-tested at our Shanghai manufacturing facility prior to departure, site civil works are minimal. Once the container is set on a standard concrete footing, installation requires only raw seawater intake coupling, permeate discharge tie-in, concentrate outfall connection, and main electrical power connection. Mechanical and electrical commissioning typically takes 3 to 7 working days, allowing clients to transition from delivery to pure water delivery within a single week.

Yes. Our Disc Tube Reverse Osmosis (DTRO) and Spacer Tube Reverse Osmosis (STRO) modules are specifically engineered for high-fouling, hyper-saline fluid streams that would cause instant irreversible fouling in spiral-wound membranes. Featuring open-channel hydraulic geometry, short fluid paths, and high turbulence disc designs, Tongjie DTRO systems operate at working pressures up to 90 to 120 bar, concentrating oilfield fracturing flowback and industrial wastewater brines up to 100,000–140,000 mg/L TDS before sending the concentrate to thermal crystallizers, enabling true Zero Liquid Discharge (ZLD).

We provide full white-label and co-branded manufacturing agreements. This includes designing skids according to your proprietary engineering standards, painting structural members in specified corporate RAL color palettes, programming customized HMI graphical interfaces showcasing your brand identity, compiling comprehensive engineering documentation packages (P&ID, 3D STEP models, electrical schematics, O&M manuals), and affixing customized customer nameplates.

Tongjie holds CE certification for the European market and has obtained ISO 9001 (Quality Management), ISO 14001 (Environmental Management), and ISO 45001 (Occupational Health & Safety) certifications. Furthermore, we maintain Class II Contracting Qualifications in Environmental Protection Engineering and Class II Contracting Qualifications in Mechanical & Electrical Installation. Our engineering portfolio is protected by over 38 utility and invention patents covering energy recovery integration, high-pressure brine concentration, and membrane antifouling control algorithms.