Abstract
Natural pyrite, as an ubiquitous mineral in the reducing environments, shows great potential on the treatment of wastewater polluted by heavy metals. In the present work, a dynamic leaching experiment was carried out to investigate the removal efficiency of U(VI) by natural pyrite under the oxygen rich conditions with/without bicarbonate ions. Experimental results shows that pyrite oxidation can significantly remove U(VI) from the solution under the oxygen rich conditions with/without bicarbonate ions. With the absence of bicarbonate ions, U(VI) concentration decreases from 50 mg/L to 20 mg/L with the removal rate up to 60%; with the presence of bicarbonate ions, U(VI) concentration decreases from 50 mg/L to 30 m/L with the removal rate up to 40%, indicating that natural pyrite can be an effective material to treat high-uranium groundwater under the oxygen-rich conditions with bicarbonate present or not.
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