Ba AND Sr adsorption on microbially formed Mn oxide; Implication to removal of Ra from U mining wastewater

Tanaka, Kazuya ; Kozai, Naofumi ; Yamaji, Keiko*; Masuya, Hayato*; Grambow, B.

Radium-226, a descendant nuclide of $^{238}$ U, is of serious concern in Ningyo-toge Environmental Engineering Center because its radioactive concentration in mining wastewater exceeds the effluent standard. In this study, we examined Ba and Sr adsorption on biogenic Mn oxide as a preliminary surrogate for Ra adsorption. Both Ba and Sr show the dependence of adsorption on NaCl concentration. Overall, Ba gave an order of magnitude higher Kd values than Sr. Adsorption behavior of Ra would be similar to that of Ba in terms of ionic radius. Barium showed Kd value greater than 10 $^{5}$ in 10 mM NaCl solution, similar to the ionic strength of the fresh water system in the Ningyo-toge center. Therefore, it is expected that the biogenic Mn can work effectively for removal of Ra from mining wastewater.

Language	:	English
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Meeting title	:	17th International Conference on the Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere (Migration 2019)
Held date	:	2019/09
Location (city)	:	Uji
Location (country)	:	Japan
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Keywords	:	生物性マンガン酸化物; 吸着; ラジウム
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Registration No. : BB20191199
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