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中文摘要：
利用聚乙烯醇和海藻酸钠制备了硫酸盐还原菌微球,探讨了Zn2＋、Cu2＋、乙酸钠、草酸钠和柠檬酸钠对其还原U（Ⅵ）的影响,考察了其选择性去除U（Ⅵ）的工艺。实验结果表明,当Zn2＋或Cu2＋浓度低于100mg/L时,U（Ⅵ）还原未受显著影响,但当其增至150mg/L时,U（Ⅵ）还原被完全抑制。当单齿配体有机物（乙酸钠）存在时,U（Ⅵ）可被彻底还原;而多齿配体有机物（草酸钠和柠檬酸钠）存在时,会延缓甚至完全抑制U（Ⅵ）的还原。对于无机-U（Ⅵ）-重金属体系,可利用U（Ⅵ）和硫酸盐还原自由能的差异,适当降低COD/SO2-4比值直接选择性去除U（Ⅵ）;对于有机-U（Ⅵ）-重金属体系,可通过多齿配体有机物络合U（Ⅵ）,同时利用硫化物选择性沉淀重金属,间接实现U（Ⅵ）的选择性去除。
英文摘要：
The sulfate-reducing bacteria immobilized in polyvinyl alcohol-sodium alginate beads were prepared .The impacts of Zn2＋ ,Cu2＋ ,acetate ,oxalate and citrate on the reduction of U （Ⅵ ） were investigated .Furthermore ,selective removal of U （Ⅵ ） or heavy metals was assessed .The results indicate that the existing of Zn2＋ or Cu2＋doesn’t affect U （Ⅵ） removal appreciably w hen their concentrations are less than 100 mg/L ,but they can inhibit U （Ⅵ） removal completely w hile their concentrations reach 150 mg/L .In the presence of monodentate ligand （acetate） ,U （Ⅵ） can be removed readily ,w hereas multidentate ligands （oxalate and citrate ） impose an inhibition on U （Ⅵ ） removal .In organic-free wastewater ,direct selective removal of U （Ⅵ ） can be achieved based on thermodynamic considerations and optimized by appropriately lowering COD/SO2 -4 .In＆nbsp;wastewater containing multidentate organics ,U（Ⅵ） can be firstly complexed during precipitation of Zn2＋ and Cu2＋ , and then removed directively after degradation of organic ligands .
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