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Method for restoring soil heavy metal cadmium pollution

A technology for remediation of soil and heavy metals, applied in the field of remediation of heavy metal cadmium pollution in soil, can solve problems such as weak soil remediation ability, slow growth rate, application limitation, etc., and achieve the effects of accelerating restoration, rapid growth, and releasing growth inhibition.

Active Publication Date: 2018-11-06
GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for now, there is still a big bottleneck in the application of phytoremediation, mainly because hyperaccumulative plants often show short plants, low biomass, and slow growth in soils with high cadmium pollution concentrations. Weak capacity, so its application is limited

Method used

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  • Method for restoring soil heavy metal cadmium pollution
  • Method for restoring soil heavy metal cadmium pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for remediating soil heavy metal cadmium pollution, said method comprising the following steps:

[0034] a. Choose the land free of heavy metal cadmium pollution as the seedling base of grain amaranth.

[0035] b. Before sowing, trim the land, apply sufficient base fertilizer, and drill the seeds of amaranth seeds with a row spacing of 50-60 cm, shallow ditching, shallow covering soil, and a plant-to-plant spacing of 15 cm.

[0036] c, grain amaranth takes root and germinates, grows into seedlings and continues to cultivate, after it grows to 20 leaf ages, the root length of grain amaranth is regularly sampled, and when its main root grows to 7cm, its aerial part is mowed and reserved 1 functional leaf and removed from the seedling base with a small amount of soil on the root.

[0037] d. Select the soil with a soil cadmium concentration of 20 mg / kg as the soil to be repaired, open holes on it, plant the grain amaranth removed from step c, and continue to cult...

Embodiment 2

[0041] A method for remediating soil heavy metal cadmium pollution, said method comprising the following steps:

[0042] a. Choose the land free of heavy metal cadmium pollution as the seedling base of grain amaranth.

[0043] b. Before sowing, trim the land, apply sufficient base fertilizer, and drill the seeds of amaranth seeds with a row spacing of 50-60 cm, shallow ditching, shallow covering soil, and a plant-to-plant spacing of 15 cm.

[0044] c, grain amaranth takes root and germinates, grows into seedlings and continues to cultivate, after it grows to 20 leaf ages, the root length of grain amaranth is regularly sampled, and when its main root grows to 7cm, its aerial part is mowed and reserved 1 functional leaf and removed from the seedling base with a small amount of soil on the root.

[0045] d. Select the soil with a soil cadmium concentration of 30 mg / kg as the soil to be repaired, open holes on it, plant the grain amaranth removed from step c, and continue to cultiv...

Embodiment 3

[0049] A method for remediating soil heavy metal cadmium pollution, said method comprising the following steps:

[0050] a. Choose the land free of heavy metal cadmium pollution as the seedling base of grain amaranth.

[0051] b. Before sowing, trim the land, apply sufficient base fertilizer, and drill the seeds of amaranth seeds with a row spacing of 50-60 cm, shallow ditching, shallow covering soil, and a plant-to-plant spacing of 15 cm.

[0052] c, grain amaranth takes root and germinates, grows into seedlings and continues to cultivate, after it grows to 20 leaf ages, the root length of grain amaranth is regularly sampled, and when its main root grows to 7cm, its aerial part is mowed and reserved 1 functional leaf and removed from the seedling base with a small amount of soil on the root.

[0053] d. Select the soil whose cadmium concentration is 40mg / kg as the soil to be repaired, open a hole on it, plant the grain amaranth removed from step c, and continue to cultivate....

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Abstract

The invention relates to a method for restoring soil heavy metal cadmium pollution. The method for restoring the soil heavy metal cadmium pollution comprises the following steps that a, soil without heavy metal cadmium pollution is selected and ditched, amaranthus hypochondriacus seeds are sowed, when the amaranthus hypochondriacus seeds take root and sprout and the main roots grow to 7 cm or above, the aboveground parts of the amaranthus hypochondriacus are clipped, and clipped amaranthus hypochondriacus plants are moved out; b, heavy metal cadmium polluted soil to be restored is selected andholed; and c, the clipped amaranthus hypochondriacus plants in the step a are planted in holes in the step b, the clipped amaranthus hypochondriacus plants continue to grow until the time before flowering, the aboveground parts of the amaranthus hypochondriacus are clipped, after clipping is completed, the parts, not being clipped, of the amaranthus hypochondriacus continue to grow until the timebefore flowering of the amaranthus hypochondriacus, the whole amaranthus hypochondriacus plants with underground parts are harvested. According to the method, heavy metal cadmium in the soil can be effectively gathered, and a good restoring function is achieved.

Description

technical field [0001] The invention relates to the fields of environmental protection and environmental governance, in particular to a method for repairing heavy metal cadmium pollution in soil. Background technique [0002] Soil is the natural environment on which human beings depend and an important resource for agricultural production. The food, resource and environmental issues facing the world are closely related to soil. In many developing and developed countries, soil pollution seriously hampers agricultural production. With the development of socialization and production, the problem of soil environmental pollution is becoming more and more serious, which has aroused widespread concern. [0003] Cadmium exists mostly as sulfur cadmium ore in nature, and often coexists with zinc, lead, copper, manganese and other minerals. Therefore, the main source of soil cadmium pollution is the wastewater and waste residues discharged from the development and smelting of non-f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/105
Inventor 罗连何卓彦苏洪林陈昔灯林石狮汤历
Owner GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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