Evaluation of sorptive materials for attenuation layer: Opportunities for batch sorption tests

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Installing an attenuation layer is a promising engineering measure for reducing contamination risk associated with soils and rocks containing geogenic contaminants in embankments. Sorptive materials must be evaluated for their attenuation performance in order to ensure environmental safety when they are used as attenuation layers. This work discusses the fluorine attenuation of magnesium oxide as a stabilizing agent using batch sorption tests. During the 3 to 168 hours tests, three liquid-to-solid ratios (L/S), namely, 250, 500, and 1000 mL/g, were applied. With the partition coefficient data from the batch tests, column test results were fitted using a one-dimensional advectiondispersion equation. Longer contact times resulted in more fluoride sorption in the amended soil. While the sorption behavior was affected by the contact period, most of the reaction might have been completed within 48 hours. This is because, within 48 hours, approximately 80% of the fluoride was sorbed. A partition coefficient (K_d) of 1740 mL/g for the L/S 1000 case run for 168 hours was determined, which may be an overestimate of the attenuation layer's performance at the site. For a safe evaluation of the attenuation layers performance, the partition coefficient obtained from batch tests run for shorter periods is recommended.

9th International Congress on Environmental Geotechnics (ICEG2023)

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