LEWATIT® FO 36

Summary

Product identification

• Product Name: Lewatit® FO 36
• Type: Macroporous, monodispersed, polystyrene-based resin for selective adsorption of oxoanions.
• Functional Group: FeO(OH) (iron oxide film on polystyrene matrix)
• Ionic Form as Shipped: Neutral
• Structure: Macroporous
• Appearance: Brown, opaque

Applications

Lewatit® FO 36 is suitable for:

• Arsenic removal from drinking water.
• Arsenic removal from ground water and waste water.
• Arsenic removal from process solutions, even in the presence of high salt concentrations.

It can remove arsenic to concentrations significantly lower than 10 µg/l. The resin can also selectively adsorb other species like HPO₄²⁻, HSiO₃⁻, HSbO₄²⁻, HVO₄²⁻, SCN⁻, and naturally occurring organic matter, tannins, lignins, uranium complexes, and chromate.

Operating Limits

• Minimum pH Exposure: 4 (to prevent dissolution of iron oxide)
• Stability pH Range: 4 - 14

Physical and Chemical Properties

• Uniformity Coefficient: max. 1.1
• Mean Bead Size: 0.34 - 0.38 mm
• Share of Beads in Range (Mean Bead Size +/- 0.05 mm): > 90 vol. %
• Bulk Density: 0.765 kg/l
• Density: approx. 1.25 g/ml
• Specific Pressure Drop (15 °C): approx. 1.97 kPa·h/m²
• Bed Expansion (20 °C, per m/h): approx. 9.8 vol. %
• Water Retention: 53 - 58 wt. %
• Storability: max. 2 years
• Storage Temperature Range: -20 to +40 °C

Recommended Operating Conditions

• Operating Temperature: max. 60 °C
• Operating pH Range: 4 - 11
• Bed Depth: min. 1000 mm
• Pressure Drop: max. 250 kPa
• Linear Velocity (Operation): max. 30 m/h
• Linear Velocity (Backwash, 20 °C): approx. 4 m/h
• Freeboard (Backwash, external / intern): 100 vol. %
• Regenerant: NaOH + NaCl (mass ratio 1:1)
• Co-current Regeneration Level: approx. 40 + 40 g/l
• Co-current Regeneration Concentration: approx. 2 + 2 wt. %
• Linear Velocity (Regeneration): approx. 5 m/h
• Rinse Water Requirement (Slow / Fast): approx. 5 BV
• Linear Velocity (Rinsing): approx. 5 m/h
• Conditioning: HCl or H₂SO₄
• Conditioning pH (min.): 4
• Conditioning Flow Direction: Upflow
• Linear Velocity (Conditioning): approx. 4 m/h
• Conditioning Duration: approx. 12 h

Recommended Start-up Conditions (for drinking water and food applications)

• Linear Velocity: approx. 5 m/h
• Rinse Water Requirement: approx. 2 BV

Additional Information

• Compliance: Complies with European Resolution ResAP (2004)3 and AFNOR test T 90-601 for Total Organic Carbon (TOC) release after pre-treatment.
• Safety: Observe safety data sheet. Avoid contact with strong oxidants. Store above freezing point, dry, and out of direct sunlight.
• Disposal: According to European waste nomenclature.

Disclaimer Extraction may miss figures, footnotes, or revisions; contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror