A phytoremediation method for underground soil pollution
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A soil pollution and phytoremediation technology, applied in the field of contaminated environment remediation, can solve the problems of less research on the root growth of remediation plants, and achieve the effect of improving remediation efficiency and efficient soil in-situ remediation
Active Publication Date: 2019-01-25
浙江博世华环保科技有限公司
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[0007] The above methods are mainly aimed at the selection of restoration plant species and the research on soil restoration agents that cooperate with restoration plants. There are few studies on how to adjust the root growth of restoration plants more reasonably.
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Embodiment 1
[0040] Poplar (Xinjiang Populus) was used as the restoration plant to carry out the experiment.
[0041] A method for phytoremediation of underground soil pollution, specifically comprising the following steps:
[0042] (1) Take the pollution source as the center, investigate the types, depths and concentrations of pollutants in the surrounding soil, and use the Surfer software film to prepare the shape characteristics of the three-dimensional pollution plume according to the pollutant investigation results, (such as figure 1 shown).
[0043] (2) Select the pollution point with the depth of the pollution plume within the range of 6-10m, and excavate a deep well with a diameter of 0.7m and a depth 0.5-1m higher than the groundwater level.
[0044] (3) Place a high-density polyethylene plastic-limiting film with a hollow cylindrical structure with openings at both ends in the well, so that the outer wall of the plastic-limiting film is close to the inner wall of the deep well, ...
Embodiment 2
[0059] Using willow (Salix nigra) as the restoration plant, the test was carried out. The specific restoration method and measurement method were the same as in Example 1, and the results are shown in Table 2.
[0060] Table 2 The absorption and removal effect of willow on common soil pollutants
[0061]
[0062] Note: During the above heavy metal restoration process, willow did not show any toxic effect.
[0063] From the above results, it can be clearly seen that poplar and willow have obvious extraction effects on heavy metals and organic pollutants in the third year after planting, and the accumulation ability of roots, stems and leaves to pollutants is different. Heavy metals are mainly reflected in the accumulation of plants, while some organic pollutants may be degraded in plant roots and plants, and some volatile pollutants can pass through the transpiration of leaves.
[0064] Taking heavy metal pollution as an example, in a poplar or willow tree with a dry weight...
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Abstract
The invention discloses a phytoremediation method for underground soil pollution. The method comprises the steps that the periphery underground soil polluted environment is surveyed with a pollution source as a center, the polluted plume shape characteristics are simulated, a pollution point is determined, and well spacing is conducted; a plastic limiting film is placed in a well, a culture medium is added in the film, and a restoring plant is transplanted in the culture medium; the plastic limiting film is of a hollow cylinder structure with openings in the two ends, the top of the plastic limiting film is flush with the ground, the bottom of the plastic limiting film goes deep into the underground soil polluted area and is higher than the underground water level by 0.5 m-1 m, the plastic limiting film can circumferentially surround the root system of the restoring plant, and the transverse growth of the root system of the restoring plant is limited; and the restoring plant is cultivated till the soil reaches the standard. The restoring plant is planted at the specific pollution point according to the polluted plume characteristics, the plastic limiting film is arranged on the periphery of the restoring plant, and therefore the restoring plant can more reasonably grow towards a to-be-restored area polluted underground; and the restoring efficiency is improved, and the purpose of efficient soil in-situ restoring is achieved.
Description
technical field [0001] The invention relates to the technical field of remediation of polluted environment, in particular to a method for phytoremediation of underground soil pollution. Background technique [0002] After decades of industrialization, a large number of factories have been shut down due to serious pollution. After investigation, it was found that most of the factories had different degrees of pollution, and the pollution situation was more complicated due to the long time of pollution and the complex and diverse geological terrain. On the one hand, the polluted soil will directly pollute the groundwater, causing water crisis for people; [0003] According to the characteristics of pollution, the surface pollution of underground soil can be roughly divided into two categories: one is that the pollutants are not affected by groundwater and topography, penetrate directly below the pollution source, and spread to the surroundings, forming a so-called "pollution ...
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