Emerson Hilary P, Di Pietro Silvina, Katsenovich Yelena, Szecsody Jim
Applied Research Center, Florida International University, 10555 W Flagler St, Miami, FL 33174, United States.
Applied Research Center, Florida International University, 10555 W Flagler St, Miami, FL 33174, United States.
J Environ Radioact. 2017 Feb;167:150-159. doi: 10.1016/j.jenvrad.2016.11.029. Epub 2016 Dec 20.
Ammonia gas injection is a promising technique for the remediation of uranium within the vadose zone. It can be used to manipulate the pH of a system and cause co-precipitation processes that are expected to remove uranium from the aqueous phase and decrease leaching from the solid phase. The work presented in this paper explores the effects of ammonium and sodium hydroxide on the partitioning of uranium and dissolution of the kaolinite mineral in simplified synthetic groundwaters using equilibrium batch sorption and sequential extraction experiments. It shows that there is a significant increase in uranium removal in systems with divalent cations present in the aqueous phase but not in sodium chloride synthetic groundwaters. Further, the initial conditions of the aqueous phase do not affect the dissolution of kaolinite. However, the type of base treatment does have an effect on mineral dissolution.
注入氨气是一种很有前景的用于修复包气带中铀的技术。它可用于调节系统的pH值，并引发共沉淀过程，预计该过程能从水相中去除铀，并减少固相中的浸出。本文所展示的工作通过平衡批量吸附和顺序萃取实验，研究了铵和氢氧化钠对简化合成地下水中铀的分配以及高岭土矿物溶解的影响。结果表明，在水相中存在二价阳离子的系统中，铀的去除量显著增加，但在氯化钠合成地下水中则不然。此外，水相的初始条件不影响高岭土的溶解。然而，碱处理的类型确实会对矿物溶解产生影响。
