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Method for restoring heavy metal contaminated soil by comprehensively utilizing animals and plants

A technology for polluted soil and heavy metals, applied in the field of soil remediation, can solve the problems of complex operation and high repair cost, and achieve the effect of simple post-processing, thorough repair and less environmental pollution

Active Publication Date: 2015-01-21
DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Cadmium is not an essential element for the human body
3. Mercury and its compounds are highly toxic substances that can accumulate in the human body
[0005] Although there are many methods of mainstream soil remediation technology, they all have limitations, such as complicated operation and high repair cost. Therefore, it is still necessary to research and invent a simpler and more effective soil remediation method.

Method used

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  • Method for restoring heavy metal contaminated soil by comprehensively utilizing animals and plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 The method for comprehensively utilizing animals and plants to remediate heavy metal-contaminated soil, the steps are as follows:

[0027] (1) Select the heavy metal-contaminated soil to be repaired, remove weeds and shrubs manually, apply fully decomposed organic agricultural miscellaneous fertilizers at an amount of 500 kg / mu in late autumn and early winter, and deeply plow 40cm to make the soil Weathering, freezing to death overwintering pests, plowing and raking the land to pieces;

[0028](2) When the soil thaws in spring and the average temperature reaches above 10°C, transplant the woody fast-growing arbor Populus canada with the ability to enrich heavy metals, and transplant the annual seedlings of Populus canada in interlaced hole planting, with a row spacing of 2.3 meters and a plant spacing of 1.4 meters , Digging holes for planting, the hole diameter is 0.4 meters, and the hole depth is 0.3 meters. After transplanting, irrigate with water once to...

Embodiment 2

[0032] Example 2 The method for comprehensively utilizing animals and plants to remediate heavy metal-contaminated soil, the steps are as follows:

[0033] (1) Select the heavy metal-contaminated soil to be repaired, remove weeds and shrubs manually, apply fully decomposed organic agricultural miscellaneous fertilizers at an amount of 700 kg / mu in late autumn and early winter, and deeply plow 50cm to make the soil Weathering, freezing to death overwintering pests, plowing and raking the land to pieces;

[0034] (2) When the average temperature reaches above 10°C after the soil is thawed in spring, transplant the woody fast-growing arbor Populus canada with the ability to enrich heavy metals, and transplant the annual seedlings of Populus canada in interlaced hole planting, with a row spacing of 3.2 meters and a plant spacing of 1.6 meters , Digging holes for planting, the hole diameter is 0.8 meters, and the hole depth is 0.5 meters. After transplanting, irrigate with water...

Embodiment 3

[0038] Example 3 The method for comprehensively utilizing animals and plants to remediate heavy metal-contaminated soil, the steps are as follows:

[0039] (1) Select the heavy metal-contaminated soil to be repaired, manually remove weeds and shrubs, apply fully decomposed organic agricultural miscellaneous fertilizers at an amount of 600 kg / mu in late autumn and early winter, and deeply plow 45cm to make the soil Weathering, freezing to death overwintering pests, plowing and raking the land to pieces;

[0040] (2) When the average temperature reaches above 10°C after the soil is thawed in spring, transplant the woody fast-growing tree Populus canada, which has the ability to enrich heavy metals, and transplant the annual seedlings of Populus canada in interlaced hole planting, with a row spacing of 3 meters and a plant spacing of 1.5 meters. , Digging holes for planting, the hole diameter is 0.6 meters, and the hole depth is 0.4 meters. After transplanting, irrigate with w...

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Abstract

The invention discloses a method for restoring heavy metal contaminated soil by comprehensively utilizing animals and plants. The method comprises the following steps: selecting to-be-restored heavy metal contaminated soil, clearing weeds and shrubs manually, applying sufficient thoroughly decomposed organic farming mixed manure during late autumn and early winter, and deeply ploughing so that soil is weathered, overwintering insect pests are frozen to death and the soil is sufficiently ploughed; when the average temperature reaches more than 10 DEG C after the soil is unfrozen in spring, transplanting a woody fast-growing arbor of Populus X canadensis Moench with the capacity of enrichment of heavy metal; after completing transplant, when the temperature reaches more than 15 DEG C, introducing earthworms for restoring, and later collecting the earthworms; and after collecting the earthworms for the first time in the restoring process of the earthworms, introducing herbaceous plant dayflower which has super accumulation effect on Cu<2+> and high growth rate to strengthen the enrichment effect on shallow layer soil copper ions, and later integrally uprooting dayflower plants. The method is simple to operate, good in restoring effect and long in duration time.

Description

technical field [0001] The invention discloses a soil remediation method, in particular to a method for comprehensively utilizing animals and plants to remediate heavy metal-contaminated soil, and belongs to the field of soil remediation methods. Background technique [0002] Heavy metals that pollute soil mainly include: 1. Lead is a toxic metal that can accumulate in human and animal tissues. Lead pollution mainly comes from various paints, coatings, batteries, smelting, hardware, machinery, electroplating, cosmetics, hair dyes, glazed dishes, tableware, coal burning, puffed food, tap water pipes, etc. It enters the body through the skin, digestive tract, and respiratory tract and is compatible with various organs. The main toxic effects are anemia, nervous dysfunction, and kidney damage. The vulnerable groups include children, the elderly, and people with low immunity. 2. Cadmium is not an essential element for the human body. Cadmium is very toxic and can accumulate in...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 苗庆龄
Owner DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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