固定化耐辐射奇球菌对锶柱吸附与减量化研究

Study on Adsorption of Strontium by Immobilized Deinococcus radiodurans Cell Bead Packed Column and Volume Reduction

该研究采用海藻酸钠(SA)及聚乙烯醇(PVA)-SA 2种固定化载体包埋固定耐辐射奇球菌(Deinococcus Radiodurans)探讨固定化耐辐射奇球菌颗粒及其填充柱对锶的吸附、洗脱效率与减量化效果。结果表明:菌体含量为5%的SA与菌体含量为10%的PVA-SA固定化耐辐射奇球菌颗粒均有较好的机械强度;2种固定化颗粒制备的填充柱对锶离子均具有较高的吸附率,最高可达98%,洗脱率平均在90%以上;FTIR结果表明SA比PVA-SA固定化载体能提供更多的锶离子结合基团,从而具有更高的吸附率;灰化减量化结果表明SA比PVA-SA固定化载体有更大的减重比,可达1 650倍。综合结果表明SA固定化耐辐射奇球菌颗粒填充柱有更好的应用前景。

Two different immobilized carrier, sodium alginate （SA） and polyvinyl alcohol （PVA）-sodium aiginate （SA） immobilized Deinococcus radiodurans beads were used to investigate the adsorption and elution for strontium as well as the volume reduction by ashing. Results showed that both SA beads containing 5% biomass and PVA-SA beads containing 10% biomass had good mechanical strength. The packed column of SA immobilized D. radiodurans beads had higher adsorption ratio and elution ratio than PVA-SA immobilized beads for strontium, with the maximum adsorption ratio about 98% and elution ratios above 90%. PTIR results indicated that the SA immobilized D. radiodurans beads had more binding groups for strontium adsorption than PVA-SA immobilized beads. The volume reduction results showed the SA immobilized D. radiodurans beads had greater weight reduction ratio than PVA-SA immobilized beads by ashing process, which could reach about 1 650 times. The results suggested that the SA immobilized D. radiodurans beads may be potential application for wastewater treatment.