Iron Oxyhydroxide (FeOOH) Arsenic Adsorption Media

The Benchmark Solution for Groundwater and Drinking Water Arsenic Removal

As a globally recognized mainstream technology for arsenic removal from groundwater and drinking water, Iron Oxyhydroxide (FeOOH) is rapidly replacing traditional adsorbents due to its high efficiency, safety, and cost-effectiveness. Its irreplaceable technical advantages are detailed across six key dimensions.

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1. Ultra-Efficient Removal: "Single Pass, Full Compliance"

FeOOH exhibits an extremely low equilibrium concentration and ultra-high mass transfer rate, delivering exceptional performance even in micro-pollution scenarios:

• Effluent Quality: Single-stage filtration consistently reduces arsenic concentration to <0.01 mg/L (10 ppb) , surpassing the WHO guideline and national standards (e.g., GB 5749-2022).

• Adsorption Capacity: Achieves a practical operating capacity of 4–14 g-As/kg, significantly outperforming traditional activated alumina and modified zeolites.

• Service Life: Operates stably for >65,000 bed volumes (BV) at an influent As concentration of 0.1 ppm, equivalent to 2.5 years of continuous use without media replacement.

• Kinetic Superiority: Achieves >85% removal in 3 minutes and >99% removal in 5 minutes, ideally suited for continuous flow water supply systems.

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2. Wide pH Adaptability: No Acid, No Alkali, No Hassle

Natural groundwater pH is predominantly neutral. Unlike conventional adsorbents requiring frequent pH adjustment, FeOOH is inherently compatible:

• Applicable pH Range: 5.0–9.0, covering the vast majority of groundwater qualities.

• Optimal Reaction Zone: 6.5–7.5, perfectly overlapping with the pH of drinking water.

• Simplified Operation: Eliminates the need for acid/alkali dosing systems, significantly reducing capital investment and maintenance costs.

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3. Strong Interference Resistance: A "Precision Catcher" in Complex Water Matrices

Conventional adsorbents suffer from competitive adsorption by sulfate, bicarbonate, and other background ions. FeOOH demonstrates exceptional selectivity:

• High Selectivity Coefficient: Maintains a selectivity coefficient >200 even under extreme conditions with SO₄²⁻ up to 1000 mg/L and HCO₃⁻ up to 500 mg/L, with negligible impact on adsorption performance.

• Broad-Spectrum Removal: Simultaneously adsorbs phosphate, vanadium, hexavalent chromium, and hydrogen sulfide, achieving "one media, multiple benefits".

• Species Adaptability: Exhibits strong affinity for both As(III) and As(V) , requiring no pre-oxidation step for arsenic speciation conversion.

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4. Oxidation-Adsorption Synergy: Solving the Global As(III) Challenge

As(III) is 60 times more toxic than As(V) and, being electroneutral, is difficult to capture using conventional adsorbents. FeOOH achieves a technological breakthrough through surface crystal lattice doping with manganese (Mn(IV)) :

• In-situ Oxidation: Rapidly oxidizes As(III) to As(V) on the material surface.

• Simultaneous Immobilization: Immediately following oxidation, As(V) is chemically adsorbed via ligand exchange.

• Process Intensification: Completes "Oxidation + Adsorption" in a single step, eliminating the need for pre-oxidant dosing and reaction tanks, saving footprint and operational costs.

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5. Green & Safe: Lifecycle Friendliness from Raw Material to Disposal

• Material Purity: Made from high-purity iron-based precursors; zero organic solvents used in manufacturing.

• Non-Hazardous Disposal: Spent media exhibits no leaching toxicity and can be safely disposed of in municipal solid waste landfills.

• Regenerability: In-situ regeneration with NaOH solution; removal rate remains >90% after 5 regeneration cycles, significantly reducing lifecycle carbon footprint.

6. Versatile Forms: From Nano to Granular, Matching Every Application Scenario

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  Product Form	Specification	Application Scenario
  Granular Media	0.2–2.0 mm	Village water plants, POU/POE devices, centralized water stations
  Powder (BKsorb-P)	5-minute rapid mixing	Emergency water supply, sudden high-As pollution events
  In-situ Precipitation	Fe²⁺ auto-oxidation	Irrigation canals, infiltration trenches, constructed wetlands
  Supported Composite	Activated carbon / Zeolite carrier	Modular purification units, compact devices

  
  

  
  

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