Bridging the gap between batch and column experiments: A case study of Cs adsorption on granite

Tsing Hai Wang, Ming Hsu Li, Shi Ping Teng

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Both batch and column methods are conventionally utilized to determine some critical parameters for assessing the transport of contaminants of concern. The validity of using these parameters is somewhat confusing, however, since outputs such as distribution coefficient (Kd) from these two approaches are often discrepant. To bridge this gap, all possible factors that might contribute to this discrepancy were thoroughly investigated in this report by a case study of Cs sorption to crushed granite under various conditions. Our results confirm an important finding that solid/liquid (S/L) ratio is the dominant factor responsible for this discrepancy. As long as the S/L ratio exceeds 0.25, a consistent Kd value can be reached by the two methods. Under these conditions (S/L ratios > 0.25), the sorption capacity of the solid is about an order of magnitude less than that in low S/L ratios (<0.25). Although low sorption capacity is observed in the cases of high S/L ratios, the sorption usually takes place preferentially on the most favorable (thermodynamically stable) sorption sites to form a stronger binding. This is verified by our desorption experiments in which a linear isotherm feature is shown either in deionized water or in 1 M of ammonium acetate solutions. It may be concluded that batch experiment with an S/L ratio exceeding 0.25 is crucial to obtain convincing Kd values for safety assessment of radioactive waste repository.

Original languageEnglish
Pages (from-to)409-415
Number of pages7
JournalJournal of Hazardous Materials
Volume161
Issue number1
DOIs
StatePublished - 15 Jan 2009

Keywords

  • Batch experiment
  • Cesium
  • Column experiment
  • Safety assessment
  • Solid/liquid ratio

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