β-甘油磷酸钠修复含铀地下水  

Remediation of uranium contaminated groundwater by β-glycerophosphate

作　　者：黄超 张辉[1,2] 胡南[1,2] 丁德馨[1,2] 李殿鑫[1,2] 孙静 HUANG Chao;ZHANG Hui;HU Nan;DING De-xin;LI Dian-xin;SUN Jing(Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang 421001,China;Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学,铀矿冶生物技术国防重点学科实验室,湖南衡阳421001 [2]南华大学,极贫铀资源绿色开发技术湖南省重点实验室,湖南衡阳421001

出　　处：《中国环境科学》2018年第9期3391-3397,共7页China Environmental Science

基　　金：国家自然科学基金重点项目(U1401231);国家自然科学基金面上项目(11775106);湖南省教育厅一般项目(15C1179)。

摘　　要：利用微模型实验,研究β-甘油磷酸钠修复含铀地下水的效果,监测厌氧培养过程中硝酸盐、硫酸盐、磷酸盐、pH值和铀浓度的变化,分析沉积物中铀的化学形态以及U(IV)的比例.结果表明:厌氧培养25d后,β-甘油磷酸钠组和甘油组的铀浓度分别从2.96,2.99mg/L降低到0.030,0.044mg/L,达到了我国《铀矿冶辐射防护和环境保护规定(GB23727-2009)》规定的排放标准.β-甘油磷酸钠作为碳源和磷源能够降低沉积物中可交换态和碳酸盐结合态铀的比例,并能提高沉积物中铁锰氧化物结合态,有机结合态和残渣态铀的比例;厌氧培养25d后,β-甘油磷酸钠组沉积物中U(IV)的比例达到了91.79%,比甘油组提高了28.82%,厌氧培养45d后,β-甘油磷酸钠组沉积物中U(IV)的比例基本保持不变,而甘油组则下降了7.98%.β-甘油磷酸钠作为碳源和磷源,能够促进U(VI)的生物还原和矿化从而将铀原位固定.The microcosm experiment were conducted to investigate the remediation effect of uranium contaminated groundwater byβ-glycerophosphate.The variations of pH and nitrate,sulfate,phosphate,and uranium concentrations were monitored during the incubation,and the uranium species and the proportion of U(IV)in sediments were analysed.It was found that,after 25d incubation,the concentrations of uranium in liquids in theβ-glycerophosphate and glycerol amended groups decreased from 2.96 and 2.99mg/L to 0.030 and 0.044mg/L,respectively,which were lower than the limits of contaminants stipulated in the regulations on radiation and environment protection in uranium mining and milling in China.β-glycerophosphate worked as the carbon and phosphate sources and reduced the proportion of the uranium species in exchangeable and carbonate fractions in sediments and increased the proportion of the uranium species in Fe(Mn)oxides,organic matter and residual fractions in sediments.The proportion of U(IV)in the sediment ofβ-glycerophosphate amended group amounted to 91.79%,which was 28.82%higher than that of the glycerol amended group.After 45d anaerobic incubation,the proportion of U(IV)in the sediment ofβ-glycerophosphate amended group almost remained unchanged,while that in glycerol amended group decreased by 7.98%.Therefore,β-glycerophosphate could work as carbon and phosphate sources and could immobilize uranium in-situ through bioreduction and biomineralization.

关 键 词：β-甘油磷酸钠 含铀地下水 生物还原 生物矿化 原位固定 

分 类 号：X52[环境科学与工程—环境工程]