原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2014年
4期
583-590
,共8页
唐振平%周帅%王文涛%谢水波%高媛媛%马华龙
唐振平%週帥%王文濤%謝水波%高媛媛%馬華龍
당진평%주수%왕문도%사수파%고원원%마화룡
硫酸盐还原菌%固定化%U(Ⅵ)%选择性去除
硫痠鹽還原菌%固定化%U(Ⅵ)%選擇性去除
류산염환원균%고정화%U(Ⅵ)%선택성거제
sulfate-reducing bacteria%immobilization%U (Ⅵ)%selective removal
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100 mg/L时,U (Ⅵ)还原未受显著影响,但当其增至150 mg/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。
利用聚乙烯醇和海藻痠鈉製備瞭硫痠鹽還原菌微毬,探討瞭Zn2+、Cu2+、乙痠鈉、草痠鈉和檸檬痠鈉對其還原U (Ⅵ)的影響,攷察瞭其選擇性去除U (Ⅵ)的工藝。實驗結果錶明,噹Zn2+或Cu2+濃度低于100 mg/L時,U (Ⅵ)還原未受顯著影響,但噹其增至150 mg/L時,U (Ⅵ)還原被完全抑製。噹單齒配體有機物(乙痠鈉)存在時,U(Ⅵ)可被徹底還原;而多齒配體有機物(草痠鈉和檸檬痠鈉)存在時,會延緩甚至完全抑製U(Ⅵ)的還原。對于無機-U(Ⅵ)-重金屬體繫,可利用U(Ⅵ)和硫痠鹽還原自由能的差異,適噹降低COD/SO2-4比值直接選擇性去除U (Ⅵ);對于有機-U (Ⅵ)-重金屬體繫,可通過多齒配體有機物絡閤U(Ⅵ),同時利用硫化物選擇性沉澱重金屬,間接實現U(Ⅵ)的選擇性去除。
이용취을희순화해조산납제비료류산염환원균미구,탐토료Zn2+、Cu2+、을산납、초산납화저몽산납대기환원U (Ⅵ)적영향,고찰료기선택성거제U (Ⅵ)적공예。실험결과표명,당Zn2+혹Cu2+농도저우100 mg/L시,U (Ⅵ)환원미수현저영향,단당기증지150 mg/L시,U (Ⅵ)환원피완전억제。당단치배체유궤물(을산납)존재시,U(Ⅵ)가피철저환원;이다치배체유궤물(초산납화저몽산납)존재시,회연완심지완전억제U(Ⅵ)적환원。대우무궤-U(Ⅵ)-중금속체계,가이용U(Ⅵ)화류산염환원자유능적차이,괄당강저COD/SO2-4비치직접선택성거제U (Ⅵ);대우유궤-U (Ⅵ)-중금속체계,가통과다치배체유궤물락합U(Ⅵ),동시이용류화물선택성침정중금속,간접실현U(Ⅵ)적선택성거제。
T he 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 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 .