Phytoremediation Competence of Composite Heavy-Metal-Contaminated Sediments by Intercropping L. with Two Species of Plants.

A variety of remediation approaches have been applied to reduce the harm and diffusion of heavy metals in aquatic sediments; however, phytoremediation in co-contaminated soils is still not clear. In order to explore the phytoremediation of sediments contaminated by Cu and Pb, two submerged plants with different characteristics, and , were interplanted with . By simulating a submerged plant ecological environment, medium-scale-simulated ecological remediation experiments were carried out. The results showed that the two planting patterns were effective in repairing the sediments in the Cu and Pb contaminated sediments. The intercropping of and can be used as the plant stabilizer of Cu because of the TF > 1 and BCF < 1, and the intercropping with can regulate the enrichment efficiency of . The removal rates of Cu and Pb in sediments reached 26.1% and 68.4%, respectively, under the two planting patterns. The risk grade of the restored sediments was RI < 150, indicating a low risk.