Reductive dechlorination using modified green rusts in degradative solidification/stabilization
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The goal of this study was to investigate the activity of modified green rusts for chlorinated hydrocarbons degradation to be used in degradative solidification/stabilization (ds/s). Tetrachloroethylene (PCE) was used as a model chlorinated organics to test the activity test of modified green rusts. Chloride green rust was synthesized by partial air oxidation method and modified by 10% Portland cement solution, Portland cement extract and chemical solutions including Al(III), Ca(II), Cu(II), Mg(II), Mn(II), Ni(II), Pt(II) and Zn(II). Green rusts modified by 10% Portland cement and Portland cement extract showed significantly higher PCE reduction rates (40 and 80 times) than unmodified chloride green rust. Portland cement extract was more efficient modifying agent than 10% Portland cement solution. These techniques may produce green rusts that are complex mixtures of different types of green rust. Modifications by a single element also enhanced the activity of green rust. Cu-modified and Ni-modified green rusts could remove more than 90% of PCE, and Al-modified green rust remove about 65% of PCE for 10 days at room temperature. The activities of single element-modified green rusts were affected by both cation and anion in modifying agents.
