植物共植对低浓度含铀废水修复的影响

为确定植物共植对低浓度含铀废水修复的影响,本研究建立了数种植物共植体系,并以之开展了低浓度含铀废水修复实验,研究了水体中铀含量随时间的变化以及铀质量浓度对植物共植体系修复效率的影响。结果显示,与相对应的单一植物修复体系相比,合果芋-豆瓣绿、白鹤芋-豆瓣绿共植修复体系对废水中铀的去除率提高了4.7%、6%和4.5%、5.7%,合果芋的转运系数、生物富集系数、生物富集量分别提高132.20%、63.89%、63.89%,豆瓣绿分别提高6%、37.27%、37.27%,白鹤芋分别提高127.69%、108.24%、108.24%,豆瓣绿分别提高3.39%、39.20%、39.20%。不同铀质量浓度废水修复实验结果表明,与单一植物修复体系相比,优势植物共植对低浓度含铀废水的修复均有促进作用。植物共植体系中植物间的互促作用可能通过提高植物的生物量和植物对铀的富集性能,从而促进了植物对铀的吸附。

Effects of Plants Co-planting on the Remediation of Low Concentration Uranium-containing Wastewater

Several plants co-planting systems were established in this study to determine the effect of plants co-planting on the remediation of low-concentration uranium-containing wastewater, and the remediation experiments of low-concentration uranium-containing wastewater were carried out. The change of uranium content in wasterwater with time and the effect of uranium concentration on the remediation efficiency of plants co-planting system were studied. The results showed that compared with the corresponding single phytoremediation system, the removal rate of uranium in wastewater by the co-planting remediation system of Syngonium podophyllum-Peperomia tetraphylla and Spathiphyllum kochii-Peperomia tetraphylla increased by 4.7%, 6% and 4.5%, 5.7%,respectively. The translocation factor, bioaccumulation factor, and bioaccumulation of Syngonium podophyllum are increased by 132.20%, 63.89%, and 63.89%, respectively (6%, 37.27%, 37.27% for Peperomia tetraphylla, 127.69%, 108.24%, 108.24% for Spathiphyllum kochii and 3.39%, 39.20%, 39.20% for Peperomia tetraphylla). The experimental results of phytoremediation in wastewater with different uranium concentrations show that compared with single phytoremediation system, the co-planting of dominant plants can promote the remediation of low concentration uranium-containing wastewater. The mutual promotion between plants in the plants co-planting system may promote the adsorption of uranium by plants through increasing the biomass of plants and the ability of plants to accumulate uranium.