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Method for reclaiming heavy metal-polluted soil

A technology of polluted soil and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of large food safety risks, poor landscape effects, lack of economic value, etc., to reduce the risk of heavy metals entering the human body, good landscape effects, water and fertilizer less demanding effect

Inactive Publication Date: 2012-03-21
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Because it is impossible to clear a large area of ​​soil heavy metal pollution in a short period of time, and because of the structural contradictions of our country's large population and small land, how to rationally use the land polluted by heavy metals, Further reducing soil erosion and preventing the further spread of heavy metals have become the concerns of the government, academia and business circles
[0006]At present, the following problems still exist in the utilization of heavy metal-contaminated land: (1) In terms of utilizing heavy-metal-contaminated land for agricultural production, at this stage, more attention is paid to Variety screening of edible crops, but this has a greater food safety risk, especially in highly polluted soil; Heavy metal tolerant plants, such as dog bud root (C.dactylon), double tassel paspalum (Paspalum distichum L.), etc. Although these plants can adapt to various harsh soil conditions , but the landscape effect is not good, and lack of economic value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Screening of heavy metal polluted soil reclamation economic crops

[0024] According to the natural conditions of the polluted farmland around the Dabaoshan mining area, peas, cucumbers, and peanuts with seeds as edible parts; water spinach and mustard greens with leaves as edible parts; and fiber crops kenaf were selected as test materials. The total amount of heavy metals in polluted soil is about: lead 1500mg / kg, zinc 470mg / kg, copper 660mg / kg, cadmium 9.7mg / kg, plant on soil with a pH between 2-3, apply soil amendments (such as limestone) , dolomite, fly ash, etc.) to adjust the pH. The heavy metal content of the edible part is selected as the assessment index. It was found that the contents of lead, zinc, copper, and cadmium in the leaves of water spinach and mustard greens greatly exceeded the national food pollutant limit standards; and the lead content in pea pods, cucumber peels, and some processed peanut seeds also exceeded the standard. The u...

Embodiment 2

[0026] Example 2: Reclamation of polluted farmland around the Dabaoshan mining area in Guangdong Province

[0027] Plant 1 mu of kenaf in the highly polluted agricultural wasteland around the Dabaoshan mining area. The total amount of heavy metals in polluted soil in this area is about: lead 1500mg / kg, zinc 470mg / kg, copper 660mg / kg, cadmium 9.7mg / kg, pH between 2-3, the pollution level is high, and ordinary crops cannot grow. Appropriately apply soil amendments (such as limestone, dolomite, fly ash, etc.) to adjust the pH to above 6. The kenaf planted on the soil is managed according to the kenaf planting method in general farmland soil, and its yield is above 20t / ha, which reaches the normal farmland soil yield level. The total amount of heavy metals in the kenaf bark is: lead<6mg / kg, zinc<140mg / kg, copper<12mg / kg, cadmium<1.5mg / kg.

[0028]

Embodiment 3

[0029] Example 3: Reclamation of polluted farmland around the Gejiu mining area in Yunnan Province

[0030] Planting 2 hectares of kenaf on heavy metal polluted farmland in Datun Town, Gejiu, Yunnan. The heavy metal content of polluted soil in this area is about: lead 3000mg / kg, zinc 1500mg / kg, copper 400mg / kg, arsenic 800mg / kg. The soil pH is between 6-7. Sow kenaf directly in the polluted soil, and manage it according to the kenaf planting method in general farmland soil. The yield of kenaf is above 25t / ha, reaching the level of normal farmland soil yield.

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Abstract

The invention discloses a method for reclaiming heavy metal-polluted soil. In the method, ambary is grown in the soil polluted by the heavy metal. According to the invention, a fiber crop ambary with the characteristics of heavy metal resistance, barrenness, large biomass, robust roots and the like is used in the method, and the purposes of reclamation, water and soil maintenance, heavy metal fixing and the like can be achieved by planting the ambary on the Multi-metal polluted soil. The method of the invention has economic value and landscape value, and is suitable for popularizing in the heavy metal-polluted farmland and waste land near the mine.

Description

[0001] technical field [0002] The invention relates to the restoration and application technology of heavy metal polluted soil, in particular to a fiber crop kenaf ( Hibiscus cannabinus ) method of reclaiming soil contaminated by various heavy metals. [0003] Background technique [0004] Soil heavy metal pollution caused by mining, mineral processing and smelting has become an increasingly serious environmental problem. According to data from the Ministry of Land and Resources, more than 10% of the country's cultivated land area has been polluted by heavy metals in 2010; data from the Ministry of Environmental Protection also shows that 12 million tons of grains are polluted by heavy metals nationwide every year, causing direct economic losses of more than 20 billion yuan. Large-scale heavy metal pollution has caused a non-negligible impact on agricultural production, environmental safety and human health. [0005] Due to the inability to remove heavy metal pollution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 仇荣亮王诗忠卢欢亮杨煜曦邓腾灏博战树顺黄穗虹
Owner SUN YAT SEN UNIV
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