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Highly selective for phosphate and arsenate anions in complex water matrices.
Exceptional chemical stability in acidic to neutral pH ranges (pH 2–8).
Low pressure drop and high hydraulic throughput due to uniform spherical bead morphology.
Regenerable with sodium chloride or dilute caustic solutions, enabling sustainable operation.
Low fines generation and excellent physical durability under repeated cycling.
Phosphate removal from municipal and industrial wastewater prior to discharge.
Pre-treatment for reverse osmosis systems to prevent scaling and membrane fouling.
Groundwater remediation targeting arsenic(V) and orthophosphate contamination.
Polishing step in surface water treatment plants for nutrient control.
Recycled process water purification in semiconductor and pharmaceutical manufacturing.
| Chemical Type | Strong-base anion exchange resin, Type I, quaternary ammonium functional group |
| Product Form | Moist, spherical beads |
| Appearance | Off-white to light yellow, translucent beads |
| Primary Applications | Selective phosphate and arsenate removal from aqueous streams |
| Key Features | High selectivity for oxyanions, low chloride leakage, regenerable |
| Functional Capacity (Cl⁻ form) | ≥ 1.1 eq/L (dry basis) |
| Particle Size Range | 0.3–1.2 mm |
| Moisture Content | 45–50% (as shipped) |
Q1: What is the primary functional group and matrix type of LEWATIT PH 3021?
A: LEWATIT PH 3021 is a macroporous, strongly acidic cation exchange resin based on a styrene-divinylbenzene copolymer matrix, functionalized with sulfonic acid groups. Its macroporous structure provides enhanced stability under varying pH and temperature conditions, making it suitable for demanding industrial water treatment applications.
Q2: Can LEWATIT PH 3021 be used in food-grade or pharmaceutical water purification systems?
A: Yes — LEWATIT PH 3021 is manufactured and tested to meet requirements for use in purified water production where regulatory compliance is required. It is commonly applied in pretreatment and polishing steps for pharmaceutical water systems (e.g., Purified Water and Water for Injection), subject to proper system validation and regeneration protocols.
Q3: How does LEWATIT PH 3021 differ from gel-type strong acid cation resins in performance?
A: Unlike gel-type resins, LEWATIT PH 3021 features a macroporous structure that maintains consistent ion exchange capacity and kinetics across a broader pH and temperature range. It demonstrates superior resistance to organic fouling and oxidative degradation, especially in feedwaters containing oxidants or trace organics.
Q4: What regeneration chemicals and typical operating conditions are recommended?
A: Sodium chloride (NaCl) is the standard regenerant for softening applications; sulfuric acid (H₂SO₄) or hydrochloric acid (HCl) may be used for full cation removal. Regeneration efficiency depends on contact time, concentration, flow rate, and temperature — best practices recommend controlled low-flow regeneration to maximize utilization and minimize waste stream volume.
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