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Evaluation of a New Arsenic Adsorbing Resin (WASP)

Evaluation of a New Arsenic Adsorbing Resin (WASP). Dr. Robert Stanforth, Ng Aik Teng and Woo Su-Fang National University of Singapore July 2002. Introduction. A Singapore Company (OSES) has developed a new arsenic adsorbing resin (WASP) Tested to determine properties and effectiveness

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Evaluation of a New Arsenic Adsorbing Resin (WASP)

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  1. Evaluation of a New Arsenic Adsorbing Resin (WASP) Dr. Robert Stanforth, Ng Aik Teng and Woo Su-Fang National University of Singapore July 2002

  2. Introduction • A Singapore Company (OSES) has developed a new arsenic adsorbing resin (WASP) • Tested to determine properties and effectiveness • Both column and batch studies used

  3. Column Studies • 1000 mg/L Arsenate solution • Column 1.2 m, 2.85 L, 35 ml/min flow • Parameters tested • pH • Ionic Strength • Residence time • As concentration reduced from 1000 mg/L to 0.001 mg/L using two columns

  4. Batch Studies • 0.5 g resin/100 mL, 1 hr, 18 RPM shaker • Parameters tested • Arsenic speciation • Arsenic concentration • pH • Ionic strength (higher ionic strength enhanced adsorption) • Reaction time (reaction almost complete within 1 hour)

  5. Conclusions • Resin very effective under optimal conditions • pH-adsorption profiles similar to metal oxides • Capacity of 35 – 50 g As/kg • Difficult to regenerate resin • Ionic strength effects mixed – needs further study • Resin has good potential

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