ARSENIC ATTENUATION BY GEOSYNTHETIC SORPTION SHEET UNDER DIFFERENT OVERBURDEN PRESSURE CONDITIONS

Abstract

Geosynthetic sorption sheet is one of the recently developed countermeasures for geogenic contaminated soils and rocks. This study focused on a geosynthetic sorption sheet containing hydrotalcite. Batch tests and column tests using arsenic solutions were conducted to evaluate the effect of contact time with leachate and overburden pressure anticipated from the load of contaminated soils and rocks. The batch test showed that the arsenic attenuation performance of the sorption sheet significantly increased after the first hour of contact. The column test demonstrated that the compressive stresses slightly contributed to the arsenic attenuation performance. Furthermore, the breakthrough curve showed a step-like behaviour.