CAJ | 학술논문

通过驯化培养得到了以硫酸盐还原菌（S RB ）为优势菌属的活性颗粒污泥，研究了微氧条件（氧浓度为0.6～1.0 mg／L）下其对废水中U（Ⅵ）的去除性能，利用傅里叶红外光谱（FTIR）、扫描电镜（SEM ）和X射线能谱（EDS ）分析了其对U （Ⅵ）的去除机理，采用连续提取法考察了铀在颗粒污泥上的沉积形态。实验结果表明，微氧条件下SRB颗粒污泥结合并转化U （Ⅵ）的过程主要分为两步：初期（前30 min）吸附和后期微生物还原沉淀作用，SRB颗粒污泥对U（Ⅵ）的去除率达98.89％。FTIR、SEM 和EDS分析表明，颗粒污泥表层上酰胺基、羧基、羟基、磷酸基等均参与了对U （Ⅵ）的沉积，同时 Na＋、M g2＋等与U O2＋2存在离子交换作用。形态分析表明，在颗粒污泥上，铀主要以残渣态形式沉积，生物有效性差，可迁移能力弱，不易造成二次污染。
통과순화배양득도료이류산염환원균（S RB ）위우세균속적활성과립오니，연구료미양조건（양농도위0.6～1.0 mg／L）하기대폐수중U（Ⅵ）적거제성능，이용부리협홍외광보（FTIR）、소묘전경（SEM ）화X사선능보（EDS ）분석료기대U （Ⅵ）적거제궤리，채용련속제취법고찰료유재과립오니상적침적형태。실험결과표명，미양조건하SRB과립오니결합병전화U （Ⅵ）적과정주요분위량보：초기（전30 min）흡부화후기미생물환원침정작용，SRB과립오니대U（Ⅵ）적거제솔체98.89％。FTIR、SEM 화EDS분석표명，과립오니표층상선알기、최기、간기、린산기등균삼여료대U （Ⅵ）적침적，동시 Na＋、M g2＋등여U O2＋2존재리자교환작용。형태분석표명，재과립오니상，유주요이잔사태형식침적，생물유효성차，가천이능력약，불역조성이차오염。
T he bioremediation behavior and mechanism of sulfate reducing bacteria (SRB) granular sludge which was artificially domesticated were studied .U(Ⅵ) removal by SRB granular sludge was investigated under micro‐aerobic condition with the concen‐tration of oxygen 0.6‐1.0 mg/L ,then the removal mechanism was analyzed with FTIR , SEM and EDS ,and finally the deposit morphology of uranium was studied with the se‐quential extraction procedure .The results show that U (Ⅵ ) removal by SRB granular sludge mainly occurs following a 2‐step process w hich is initial adsorption (the first 30 min) and microbial reduction process .The ultimate removal rate of U (Ⅵ ) reaches 98.89% .Analyses of FTIR ,SEM and EDS indicate that groups‐amide group ,carbox‐yl ,hydroxyl and phosphoric acid group coming from the surface of SRB granular sludge are involved in uranium deposition .Ion exchange happens between Na+ or Mg2+ and UO2+2 .Finally ,U(Ⅵ) mainly deposites on granular sludge in the form of residual state that has poor bioavailability ,bad migratory aptitude and less secondary pollution .