Phytoremediation method for underground soil pollution
A technology for phytoremediation and soil pollution, which is applied in the field of remediation of polluted environments, and can solve problems such as the lack of research on the growth of remediation plant roots, and achieve the effect of improving remediation efficiency and efficient soil in-situ remediation
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[0039] Example 1
[0040] Experiments were carried out with poplar (Xinjiang poplar) as a restoration plant.
[0041] A phytoremediation method for underground soil pollution, specifically including the following steps:
[0042] (1) Taking the pollution source as the center, investigate the types, depth and concentration of pollutants in the surrounding soil. According to the pollutant investigation results, use the Surfer software membrane to produce the shape characteristics of the three-dimensional pollution plume, (e.g. figure 1 Shown).
[0043] (2) Select the pollution point within the range of 6-10m in the depth of the pollution plume, and excavate a deep well with a diameter of 0.7m and a depth of 0.5-1m higher than the groundwater level.
[0044] (3) Place a high-density polyethylene plastic-limiting membrane with a hollow cylindrical structure open at both ends into the well, so that the outer wall of the plastic-limiting membrane is close to the inner wall of the deep well, an...
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[0058] Example 2
[0059] Salixnigra (Salixnigra) was used as a restoration plant to conduct experiments. The specific restoration methods and measurement methods are the same as those in Example 1, and the results are shown in Table 2.
[0060] Table 2 The absorption and removal effect of willow on common pollutants in soil
[0061]
[0062] Note: During the above-mentioned heavy metal repair process, willow trees did not show toxic effects.
[0063] From the above results, it can be clarified that poplar and willow trees have obvious extraction effects on heavy metals and organic pollutants in the third year after planting, and the roots, stems, and leaves have different ability to accumulate pollutants. For heavy metals, it is mainly reflected in the accumulation of plants, and some organic pollutants may be degraded in plant roots and plants, and some volatile pollutants may be transpired by leaves.
[0064] Taking heavy metal pollution as an example, in a poplar or willow tree wit...
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