Method for repairing calcareous cadmium-polluted soil
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A technology of cadmium-contaminated soil and remediation method, which is applied in the restoration of polluted soil, etc., and can solve problems such as high price
Inactive Publication Date: 2021-12-21
HENAN UNIVERSITY OF TECHNOLOGY
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Among these activators, except for small molecule organic acids, other activators are expensive, ranging from tens or even thousands of yuan / kg. Therefore, most of them are only used in the laboratory stage.
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[0026] The present invention will be described in more detail below in conjunction with specific embodiments, so as to facilitate the understanding of those skilled in the art.
[0027] This application selects a cadmium-contaminated soil area in Xinxiang City, Henan Province as the test site.
[0028] Before the test, 0-20cm soil samples were collected at multiple points to measure the soil properties. The results showed that the contents of total cadmium and DTPA extracted cadmium (also known as available cadmium) in the soil were 3.22 and 1.27mg / kg respectively, and the soil pH was 8.12 , Weakly alkaline, calcareous soil.
[0029] Choose a length of 40m, a width of 20m, and an area of 800m 2 plot as a test site. On both sides of the 40m long side of the test site, a protection row with a width of 2m was drawn, and no plants were planted in the protection row. Then draw a test plot with a width of 4m and a length of 10m within the scope of the test site. A guard row wi...
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Abstract
The invention discloses a method for repairing calcareous cadmium-polluted soil, which adopts a plant extraction repairing method, the used repairing plant is solanum nigrum, and the used activating agent is citric acid monohydrate. The method for repairing comprises the following specific steps that: 1, in May of the current year, planting solanum nigrum in the cadmium-polluted soil; during the growth period of the solanum nigrum, controlling aphid diseases by spraying pesticide; 2, when the solanum nigrum grows to the beginning of September, applying citric acid monohydrate to the soil according to the dosage of 0.12-0.15 kg / m < 2 >, and watering the soil according to the irrigation amount of 150 m < 3 > / hm < 2 >; and 3, , harvesting the solanum nigrum at the end of September. Aiming at the characteristics of the calcareous soil, a cadmium hyperaccumulation plant- solanum nigrum is selected as a repairing plant, and citric acid monohydrate is creatively adopted as an activating agent in order to improve the hyperaccumulation effect of the solanum nigrum on cadmium in the calcareous soil, so that the absorption of thesolanum nigrum on heavy metal cadmium in the soil is greatly promoted; and a very good phytoremediation effect is achieved.
Description
technical field [0001] The invention relates to the remediation of heavy metal polluted soil, in particular to a method for remediating calcareous cadmium polluted soil. Background technique [0002] Heavy metals generally refer to density greater than 5.5g / cm 3 metals, which are generally found in low levels in the environment and in humans, animals and plants. Commonly polluted heavy metals in soil include cadmium, chromium, lead, copper, zinc, nickel, etc. [0003] The "National Soil Pollution Survey Bulletin" issued by the former Ministry of Environmental Protection and the former Ministry of Land and Resources in 2014 shows that heavy metals are the main pollutant types in my country's soil, and the main polluting heavy metals are cadmium, mercury, arsenic, copper, lead, chromium, For zinc and nickel, the point-exceeding rates of these eight elements were 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%, 0.9% and 4.8%, respectively. The sources of soil heavy metal pollution mainly ...
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