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Biological heavy metal contaminated soil remediation method

A bioremediation and polluted soil technology, which is applied in the field of environmental protection and soil pollution control, can solve the problems of harming human health, poor mobility of heavy metal ions, soil ecological environment damage, etc., achieve high-efficiency restoration, good composite treatment effect, and shorten the restoration cycle Effect

Inactive Publication Date: 2015-01-21
重庆鼎旺环保园林有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor mobility, long-term retention and non-decomposability of heavy metal ions, it has caused great damage to the soil ecological environment. At the same time, it finally enters the human body through the food chain and seriously endangers human health. It has become an environmental problem that cannot be ignored.

Method used

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  • Biological heavy metal contaminated soil remediation method
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Examples

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Effect test

Embodiment 1

[0031] Example 1 The method for bioremediation of heavy metal polluted soil, the steps are as follows:

[0032] (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 400-800 kg / mu in late autumn and early winter, and plow 35-55cm deep to weather the soil and freeze it. dead overwintering pests, the land plowed through and harrowed;

[0033] (2) When the average temperature reaches above 10°C after the soil is thawed in spring, transplant the woody fast-growing arbor bamboo and willow with the ability to enrich heavy metals, and transplant the annual seedlings of bamboo and willow in the way of interlaced hole planting, with a row spacing of 2.5-3.5 meters and a plant spacing of 2.5-3.5 meters. 1.2-1.8 meters, dig holes for planting, the hole diameter is 0.5-0.8 meters, and the hole depth is 0.4-0.6 meters. After transplanting, irrigate once with wate...

Embodiment 2

[0037] Example 2 The method for bioremediation of heavy metal polluted soil, the steps are as follows:

[0038] (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 500-700 kg / mu in late autumn and early winter, and deeply plow 40-50cm to weather the soil and freeze it. dead overwintering pests, the land plowed through and harrowed;

[0039] (2) When the average temperature reaches above 10°C after soil thawing in spring, transplant woody fast-growing arbor bamboo and willow with the ability to enrich heavy metals, and transplant annual bamboo and willow seedlings 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 0.5~0.8 meters, and the hole depth is 0.4~0.6 meters. After transplanting, irrigate once with water to make the roots of the seedlings more clos...

Embodiment 3

[0043] Example 3 The method for bioremediation of heavy metal polluted soil is characterized in that the steps are as follows:

[0044] (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 600 kg / mu in late autumn and early winter, and plow 45cm deep to weather the soil and freeze to death overwintering pests. The land is plowed and harrowed;

[0045] (2) When the average temperature reaches above 10°C after soil thawing in spring, transplant woody fast-growing arbor bamboo and willow with the ability to enrich heavy metals, and transplant annual bamboo and willow seedlings 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 0.5~0.8 meters, and the hole depth is 0.4~0.6 meters. After transplanting, irrigate once with water to make the roots of the seedlings...

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Abstract

The invention discloses a biological heavy metal contaminated soil remediation method which comprises the following steps: (1) manually removing weeds and shrubs on to-be-remediated heavy metal contaminated soil, applying sufficient organic farm manures which are thoroughly decomposed at the season when autumn changes into winter, performing deep ploughing, so that the soil is weathered, overwintering injurious insects are frozen to death, and the land is thoroughly ploughed and harrowed; (2) transplanting woody fast-growing trees bamboo willow when the average air temperature reaches over 10 DEG C after the soil in spring is unfrozen; (3) introducing earthworms for soil remediation when the air temperature reaches over 15 DEG C after transplanting, and collecting the earthworms; (4) introducing Elsholtzia splendens and dayflower after the earthworms are collected for the first time in the earthworm remediation process, and wholly removing the Elsholtzia splendens plants and dayflower with roots; and (5) introducing the earthworms, Elsholtzia splendens and dayflower again in spring in the next year, applying sufficient organic farm manures before introduction, thoroughly ploughing and harrowing the land, and repeating the previous processes. According to the method disclosed by the invention, the animals and plants are combined to act, soil remediation is realized, and the method is economic, environment-friendly, high in remediation efficiency and easy to popularize.

Description

technical field [0001] The invention relates to the field of environmental protection and soil pollution control, in particular to a method for biologically remediating heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution refers to the phenomenon that heavy metals enter the soil due to human activities, resulting in the heavy metal content in the soil being significantly higher than the original content and causing the deterioration of the ecological environment quality. Due to the poor mobility, long-term retention and non-decomposability of heavy metal ions, it has caused great damage to the soil ecological environment. At the same time, it eventually enters the human body through the food chain and seriously endangers human health. It has become an environmental problem that cannot be ignored. With the improvement of people's living standards in our country, more and more attention has been paid to the protection of the ecological environmen...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 赵连祺
Owner 重庆鼎旺环保园林有限公司
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