- 2026-01-22
SAR reduction
Mechanism of Soil Damage Caused by High-Quality Wastewater
When the sodium adsorption ratio (SAR) of irrigation water ([Na⁺]/√([Ca²⁺]+[Mg²⁺])) exceeds 10:
Osmotic Inhibition: Sodium ions replace colloidal calcium and magnesium in the soil, leading to the dispersion of clay particles (water conductivity decreases by >70%).
Physiological Drought: When the osmotic pressure of the soil solution is >0.3 MPa, water uptake by crop roots is inhibited.
Salt Accumulation: Evaporation causes sodium salt to accumulate on the surface (annual salt accumulation can reach 2.7 tons/hectare).
Typical Characteristics:
When electrical conductivity >1.5 dS/m and SAR >12, corn yield decreases by 40%.
When the exchangeable sodium percentage in the soil is >15%, stress occurs. Deep Well Water Desalination by Reverse Osmosis Process
System Configuration:
Brackish water reverse osmosis membrane (desalination rate ≥ 97%)
High-pressure pump set (operating pressure 1.5-4.0 MPa)
Intelligent flushing unit (self-cleaning and anti-scaling)
Water Desalination Efficiency:
Inlet water index, treatment effect
Total Dissolved Solids (TDS) 3000 ppm, effluent <100 ppm
Sodium removal rate 850 mg/L >98%
SAR reduction from 18 to <3 (in line with British Standard 5084)
Engineering Application Case Studies
Commercial Irrigation Project 15,000 gallons/day:
Water source: Well water (EC 2.8 dS/m, SAR 14)
Reverse osmosis system configuration: Two-stage filtration + anti-scaling agent addition
Operating Effect:
• Tomato yield increased by 35%
• Soil electrostatic precipitation rate reduced from 19% to 7%
Agricultural Land Reclamation Project 72,000 gallons/day:
Innovative design: Energy recovery device (saves 30% of electricity)
Wastewater utilization: Evaporation and crystallization of concentrated liquid (zero liquid discharge)
Technical Advantages
Improved soil structure
Sodium adsorption ratio reduced to less than 6%
Soil porosity restored to 45%
Improved crop quality and increased yield
Increased water use efficiency for cash crops by 50%
Increased survival rate of sensitive crops For salts > 95% removal
Guaranteed intelligent operation and maintenance
Online EC/SAR monitoring (early warning response < 10 seconds)
IoT-based remote control system (compatible with 4G/5G networks)
Sustainable operation
Membrane lifespan of 5 years or more (automatic chemical cleaning procedure)
Water treatment cost per ton < US$0.25
