Biostimulation Effects on Groundwater of Neutral In-situ Leaching Uranium
Laboratory experiments were conducted on the biostimulation on a mixed system of ground-water and sandstone from a neutral in-situ leaching uranium mine.Based on the biostimulation,the remediation of carbon sources and carbon levels on uranium in groundwater was identified.The results indicate that under ethanol stimulation,the remediation efficiency of target U in neutral groundwater could reach up to 97.48％,this may be related to significant environmental neutral pH and higher re-duction Eh values(Pearson's r>0.7,P<0.01),and the biological metabolism process of ethanol has less disturbance to the water-rock environment,which ensures the relative stability of HCO-3 and SO42- plasma environments and made it easier to achieve long-term stability of U in groundwater.
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