Abstract: In order to provide theoretical guidance to the disposal of the out-of-service uranium mines, soil samples near a uranium mine that are unaffected by mining were collected and extracted microorganisms. The leaching solution obtained by diluting and adjusting pH values of uranium ore was used to simulate the acid leaching seepage of uranium solid waste, and the influence of the microorganisms to migration of U (Ⅵ) , Fe and Mn Ions was investigated by the dynamic adsorption-desorption experiment of the soil column. The results showed that: with microbial synergy, the adsorption amount of the three kinds of ion increased by 99.7%, 75.2% and 48.6%, respectively, comparing that without microbial synergy. Meanwhile, the desorption rate of the three kinds of ions in microbial soil reduced by 20.4%, 0.4% and 41.0% respectively, comparing with that in no microbial soil, indicating that the microorganism significantly inhibited the migration of the three kinds of ions in the soil. In addition, the soil itself has a strong cushioning effect on acidic wastewater, and has less relation with microorganisms.  

Key words: Indigenous microorganisms, Acid seepage of uranium solid waste, U(Ⅵ)-Fe-Mn ions, Soil, Migration