β-甘油磷酸钠修复含铀地下水

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.

Remediation of uranium contaminated groundwater by β-glycerophosphate

The microcosm experiment were conducted to investigate the remediation effect of uranium contaminated groundwater by β-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 the β-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 of β-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 of β-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.