In-situ Remediation Techniques for Heavy Metal Contaminated Sediments in Xin River
In order to address heavy metal pollution in urban river sediments,the contaminated sediments of the Xin River in Yingtan,Jiangxi Province,were chosen as the treatment target.A combined approach using chemical leaching and solidification stabilization techniques was employed to remediate heavy metal pollution in the river sediments.A chemical leaching model was designed to analyze the leaching effect and the parameters for solidification stabilization.The results indicates that oxalic acid is an ideal leaching agent with an optimal leaching time of 8 h,a solid-liquid ratio of 1∶5,and a concentration of 0.2 mol/L.The optimal composite stabilizer ratio is FeSO4∶MgO∶kaolin at 9∶11∶6 with a dosage of 100％.The ratio of solidifying materials is selected as sediment:cement:lime:sand with 50∶6∶4∶5.The concentration of heavy metals leached from the treated sediment is below the standard limit,and the unconfined compressive strength after solidification reaches 3.48 MPa.
river sedimentheavy metalschemical leachingsolidification stabilization
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