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Removal of Boron from Water
  • 2025-07-22

Removal of Boron from Water

Boron exists in the form of boric acid (H₃BO₃) or borate in water sources. The typical concentration of seawater is 4-5mg/L, and brackish water can reach 10mg/L. Its particularity lies in:

Neutral molecular form (pH<9) is difficult to remove by conventional ion exchange

WHO drinking water standard limit is 0.5mg/L (long-term excessive intake causes blood coagulation disorders)

Irrigation water exceeds 0.3mg/L, resulting in a 30% reduction in the yield of crops such as citrus

Four-stage boron removal process system

Scheme 1: Brackish water reverse osmosis system

Applicable conditions: inlet boron ≤1.5mg/L, TDS ≤10,000mg/L

Polyamide composite membrane (pH adjusted to 10.5)

Boron removal rate>85%, water recovery rate 75%

Scheme 2: RO-post-treatment integrated system

Applicable conditions: high-boron brackish water (boron>1.5mg/L)

First-level RO water production → second-level special boron adsorption resin

Final effluent boron <0.2mg/L

Solution 3: Two-stage seawater reverse osmosis

Applicable conditions: seawater desalination (boron 3-7mg/L)

First-stage seawater RO (pressure 6.5MPa) → second-stage low-salt RO

Two-stage total boron removal rate > 95%

Scheme 4: SWRO-ion exchange combination

Applicable conditions: seawater ultra-strict standards (boron < 0.1mg/L)

Seawater RO → Selective boron chelating resin (N-methylglucamine)

Resin adsorption capacity > 8g boron/L

Project case parameters

Middle East seawater desalination plant:

Processing capacity 132,000GPD (500m³/d)

Process: two-stage SWRO + boron selective resin

Outlet boron concentration: 0.08mg/L

Mining area brackish water project:

Integrated system: brackish water RO + post-adsorption unit

Inlet boron 2.8mg/L → Outlet water 0.15mg/L

Technological innovation advantages

Precise removal: NMR technology monitors boron morphology in real time and dynamically adjusts pH

Energy efficiency improvement: The two-stage RO system saves 60% energy compared to the traditional distillation method

Ecological safety: The boron concentration of drainage water is less than 0.5mg/L, meeting the fishery water standards

Agricultural guarantee: The boron qualification rate of irrigation water is 100%, and the crop yield increases by 12-15%


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