CE Certification Sea Water Treatment Process Factory & Supplier

Technical Whitepaper: Mitigating Membrane Degradation and Energy Density in Desalination

In sea water treatment engineering, operational instability originates predominantly from biological foulants and precipitation of multivalent scalants (CaSO4, BaSO4, and silicate complexes). When raw ocean water exhibits dynamic seasonal shifts—such as marine heatwaves triggering Red Tide phytoplankton surges—standard cartridge filtration cascades experience catastrophic plugging. Tongjie implements an automated coagulant-optimized Dissolved Air Flotation (DAF) upstream of pressurized PVDF ultrafiltration modules with an asymmetric nominal pore size of 0.02 microns. This process configuration guarantees that colloidal silica and particulate biological macromolecules are intercepted long before reaching high-pressure membrane matrices.

From an thermodynamic vantage, driving seawater beyond its natural osmotic threshold (approximately 27–32 bar for standard 35,000 mg/L salinity) requires high-pressure feed pumps generating upwards of 65 to 80 bar. By routing the pressurized reject brine directly into isobaric ceramic rotary pressure exchangers (ERD), hydraulic momentum is transferred directly to the incoming feed stream with mechanical efficiency exceeding 96.5%. This reduces the gross power absorbed by the high-pressure motor skid by up to 58%, lowering overall system operating costs to an industry-leading benchmark of 2.65 to 2.95 kWh per cubic meter of clean permeate produced.