• 2025-07-22

Total Dissolved Solids (TDS) Reduction

Total dissolved solids (TDS) refers to the total amount of soluble inorganic salts in water (in mg/L or ppm), and its value is positively correlated with conductivity (conversion coefficient ≈ 0.65, which needs to be corrected according to the ion composition). Typical water source TDS distribution is as follows:

Ultrapure water: <10 ppm

Municipal pipe network: 50-500 ppm

Seawater: 36,000 ppm (45,000 ppm in the Persian Gulf)

Risks of TDS exceeding the standard and monitoring requirements

When TDS>500 ppm (WHO warning value), it will lead to:

Double increase in osmotic pressure of reverse osmosis system (additional 10 PSI operating pressure is required for every 1000 ppm)

Drinking water produces metallic/salty taste (chloride>250 ppm)

Imbalance of osmotic regulation of aquarium organisms (salinity fluctuation>5%)

Increase of scaling rate of industrial equipment by 300%

Core technology solution for deep desalination

Reverse osmosis (RO) system

Use 0.0001 micron composite membrane to accurately intercept ions

Desalination rate>99% (operating pressure>60 PSI/25℃ working condition)

Simultaneously remove 120+ pollutants such as fluoride/pyrogen/colloid

Concentrated water recovery rate can be increased to 45% through ERD device

Key points of project implementation

Pretreatment needs to control SDI <3 to prevent membrane fouling

Seawater desalination needs to be equipped with titanium alloy high-pressure pump (operating pressure > 800 PSI)

Secondary RO effluent conductivity can reach 0.5 μS/cm

Technical and economic advantages

Drinking water TDS is stable at 50-200 ppm (optimal taste range)

Steam boiler feed water hardness <0.1 ppm

Electronic grade ultrapure water resistivity >18.2 MΩ·cm

Energy consumption per ton of water treatment is reduced by 80% compared with distillation