Evaluation of water contact influence on adsorbents by water immersion pretreatment and serial batch tests

• Published in: Japanese Geotechnical Journal Vol. 17; no. 2; pp. 195 - 204
• Main Authors: IMOTO, Yukari, MORIMOTO, Kazuya, NISHIKATA, Miu, YASUTAKA, Tetsuo
• Format: Journal Article
• Language: Japanese
• Published: Tokyo The Japanese Geotechnical Society 01.06.2022; Japan Science and Technology Agency
• Subjects: adsorbent; Adsorbents; Adsorption; attenuation layer method; Fluorides; Hydroxides; Immersion; Performance evaluation; Pretreatment; serial batch test; Solid phases; Submerging; Water; Water immersion; water immersion pretreatment; XRD
• ISSN: 1880-6341; 1880-6341
• DOI: 10.3208/jgs.17.195

The adsorbents used in the attenuation layer method contact with water multiple times or over a long period of time after construction, but at present, the performance is evaluated by a single batch adsorption test. In this study, to evaluate the adsorption performance of the adsorbents when they are in contact with water for multiple times or fora long period of time, we conducted a water immersion pretreatment, in which the adsorbent is immersed in water for a certain period, and a serial batch fluoride adsorption test, which is a repeated adsorption test, for four types of adsorbents: LDH, Fe-hydroxide, Mg-oxide and ZVI. As a result, changes in the crystalline phase were observed in the Mg-oxide and ZVI based materials, and the adsorption performance also changed. Therefore, it was suggested that the change in solid phase due to water contact could affect the adsorption performance.