Method for promoting restoration of mercury contaminated soil plant

A phytoremediation and mercury pollution technology, applied in the field of phytoremediation of polluted soil, can solve the problems of huge differences in the physical and chemical properties of soil and slag heap, low mercury extraction and transport capacity, and low restoration efficiency, so as to improve the restoration efficiency and simplify the implementation. , the effect of low cost

Inactive Publication Date: 2010-07-28
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Reported the ability of pea, spring wheat, sugar beet and clover to accumulate and transport mercury. It was found that although all plant roots can absorb mercury, the mercury transported to the aerial part only accounts for about 0.17%-2.5% of the root mercury content; 2007 The published "International journal of phytoremediation" reported that Rodriguez et al. used crops such as barley, lentils and lupins to repair mercury-contaminated soil, but the repair efficiency was not high. Only the aboveground part of lupine had the highest mercury content, reaching about 1mg/kg
Plant roots have a low capacity to extract and transport mercury
Attempts to increase mercury uptake b

Method used

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Experimental program
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Effect test

Embodiment Construction

[0015] Embodiments of the invention:

[0016] a. Take the soil with mercury content of 100-130mg / kg as the remediation object, and add 2g of ammonium thiosulfate per kilogram of soil as an example: plant rapeseed in the mercury-contaminated soil to be remediated, and add sulfur after the rapeseed grows for 2-3 months Ammonium sulfosulfate, adding scheme is as follows:

[0017] First, ammonium thiosulfate is dissolved in water, and the ammonium thiosulfate solution is applied to the soil at a dose of 2 g of ammonium thiosulfate per kilogram of soil. In order to improve the utilization efficiency of the ammonium thiosulfate, the solution is evenly sprayed to the soil around the plant root system with a sprayer.

[0018] After harvesting the plant and analyzing the mercury content, it is found that the total mercury content of its roots and aerial parts of rapeseed with 2g ammonium thiosulfate per kilogram of soil is 4.48 ± 0.48 and 2.14 ± 0.84mg / kg respectively; The translocat...

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Abstract

The invention discloses a method for promoting restoration of mercury contaminated soil plant by using ammonium thiosulfate, which comprises the following steps of: 1) planting rape into mercury contaminated soil; 2) after the rape grows for 2-3 months, adding ammonium thiosulfate solution into the soil, wherein 2-6g of the ammonium thiosulfate is added in per kilogram of soil; and 3) harvesting the plant after the ammonium thiosulfate is added for 3-10 days. The ammonium thiosulfate adopted by the method is pollution-free for the soil, simple in technique and low in cost, has good restoration effect for the mercury contaminated soil, and is applicable to resorting large-area mercury contaminated soil plant.

Description

technical field [0001] The invention relates to a method for using phytoremediation of polluted soil, in particular to a method for phytoremediation of mercury-contaminated soil. Background technique [0002] At present, mercury-contaminated soil is generally repaired by physical and chemical methods. The use of physical and chemical methods to restore mercury-contaminated soil is not only costly, but it is not easy to promote and use on a large scale, and it will cause great damage to soil properties and structures. For example, according to the "U.S. Environmental Protection Agency website, http: / / clu-in.org / s.focus / c / pub / i / 1464 / ", the California Environmental Protection Agency reported that the New Almaden mercury mining area is about 10,000-15,000m 3 The soil is transferred and processed, and only the initial investment per cubic meter reaches 460 US dollars / m 3 . At present, the area of ​​mercury-contaminated soil in the world is large, and the mercury-contaminated cu...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 冯新斌王建旭尹润生商立海
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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