中文摘要：

选取碳酸盐矿化菌进行培养,利用其在代谢过程中分泌的尿素酶分解尿素产生CO3^2-,从而将游离态的放射性Sr2＋转化为稳定态Sr CO3.通过能谱分析（EDS）、扫描电子显微镜（SEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）对沉淀产物进行分析,并计算核素固结率.结果表明：微生物诱导沉积的沉淀为大小混杂、表面多孔的Sr CO3晶体颗粒,并相互黏结形成不规则的团聚体;cSr^2＋、ρ（尿素）及培养时间等对Sr CO3晶体形貌产生影响;菌体本身作为成核位点参与了碳酸盐矿化菌诱导Sr^2＋的矿化过程.当cSr^2＋为0.05 mol/L、ρ（尿素）为30 g/L、p H为8.0并在30℃下培养72 h时,生成较大的微生物矿化物团聚体,对Sr^2＋固结率可达98.32%,可实现放射性核素稳定化处置.

英文摘要：

The solidifying of Sr^2＋ by carbonate mineralization bacteria, Bacillus pasteurii, in an aqueous solution was investigated. CO3^ 2- was produced by the enzyme digestion process of the species when urea was decomposing. Biochemical properties of urease from bacteria were involved in transforming free radioactive Sr^2＋ into stable SrCO3. Various analysis and testing techniques, such as EDS, SEM, XRD and FT-IR, were used to analyse the precipitate. The experimental results showed that the microbiologically-induced SrCO3 crystal particles have porous surface in chaotic sizes, bonding together forming irregular groups. Concentrations, cultivation time and urea concentrations of Sr^2＋influenced the forming of SrCO3 crystal morphology. It was also found that the bacteria participate in the progress of carbonate mineralization bacteria induced Sr^2＋ mineralization as nucleation sites. The solidifying rate reached a peak of 98.32% when the Sr^2＋concentration was set as 0.05 tool/L, urea concentration was 30 g/L and pH was 8, cultivation was at 30 R2 for 72 h, and therefore radionuclide stabilization treatment could be achieved.