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Heavy metal lead-cadmium polluted soil biological remediation method based on plants

A cadmium-contaminated soil and bioremediation technology is applied in the field of plant-based bioremediation of heavy metal lead and cadmium contaminated soil. robust effect

Inactive Publication Date: 2018-02-09
XINXIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a plant-based bioremediation method for heavy metal lead and cadmium contaminated soil and a preparation method thereof, which solves the problem that phytoremediation research in the prior art generally focuses on the screening of a single hyperaccumulator plant, the interaction between microorganisms and plants, and the The addition of chelating agents can promote the absorption of heavy metals by plants, but there are few research questions about the mutual promotion or weakening of plants' absorption of heavy metals.

Method used

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  • Heavy metal lead-cadmium polluted soil biological remediation method based on plants

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Effect test

Embodiment 1

[0034] A plant-based bioremediation method for heavy metal lead and cadmium contaminated soil, comprising the following steps:

[0035] Step 1, Prepare the Cultivation Substrate

[0036] Step 1.1, take by weight the following raw materials: 80 parts of dead leaves, 80 parts of peat, 30 parts of birch bark, 15 parts of animal excrement, 5 parts of silkworm sand, 1 part of potassium dihydrogen phosphate, 6 parts of urea;

[0037] In step 1.2, the dead leaves weighed in step 1.1 are mixed with animal feces to obtain a mixture, and water of the same quality as the mixture is added to the mixture, and the mixture is continuously stirred in the process of adding water, and the mixture is allowed to stand after adding water. 12h, then add anaerobic fermentation bacterial agent to it, ferment at 60°C for 12 days, after the fermentation is completed, the fermentation product is dried to a moisture content of 2%, then pulverized, and passed through a 40-mesh sieve to obtain organic fert...

Embodiment 2

[0051] The implementation steps of Example 2 are the same as those in Example 1, except that the cultivation substrate is prepared from the following components by weight in Example 2: 85 parts of dead leaves, 70 parts of peat, 25 parts of birch bark, 18 parts of Animal manure, 8 parts of silkworm sand, 0.5 parts of potassium dihydrogen phosphate, 5 parts of urea;

[0052] In step 4, the number of effective viable bacteria of the young set of sacculus fungus is 1×10 9 pcs / g;

[0053] In step 4, the fertilizer is composed of the following components by weight: 45 parts of ammonium nitrate, 15 parts of ammonium polyphosphate, 15 parts of potassium fulvic acid, 1 part of chitosan, 2 parts of EDTA-Mg, 2 parts of citric acid, 1 part lecithin, 0.1 part gibberellin.

[0054] Example 2 After repeated planting 4 times, it was detected that the concentration of lead in the soil was 102 mg / kg and the concentration of cadmium was 0.16 mg / kg, which reached the secondary standard of soil ...

Embodiment 3

[0056] The implementation steps of Example 3 are the same as those of Example 1, except that the cultivation substrate in Example 3 is prepared from the following components by weight: 90 parts of dead leaves, 60 parts of peat, 20 parts of birch bark, 20 parts of Animal manure, 10 parts of silkworm sand, 0.8 parts of potassium dihydrogen phosphate, 3 parts of urea;

[0057] In step 4, the number of effective viable bacteria of the young set of sacculus fungus inoculum is 5×10 8 pcs / g;

[0058] In step 4, the fertilizer is made up of the following components by weight: 50 parts of ammonium nitrate, 10 parts of ammonium polyphosphate, 20 parts of potassium fulvic acid, 5 parts of chitosan, 1 part of EDTA-Zn, 3 parts of citric acid, 0.5 part lecithin, 0.1 part naphthalene acetic acid.

[0059] Example 3 After repeated planting 4 times, it was detected that the concentration of lead in the soil was 92 mg / kg and the concentration of cadmium was 0.18 mg / kg, which reached the secon...

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Abstract

The invention discloses a heavy metal lead-cadmium polluted soil biological remediation method based on plants. The method comprises the following steps of culture medium preparing, planting cavity forming, transplanting, fertilization and harvesting. Heavy metal lead and cadmium in soil are removed jointly through cooperation of citric acid and ornamental plants, day lily, fleur-de-lis and cannaare planted in a combined manner, the plant growth amount, the full lead-cadmium content and the lead-cadmium content of different organs in the planting mode are analyzed and measured, the capabilityof removing the lead and cadmium in the heavy metal polluted soil through the method is studied, and the testing result shows that the survival rate of the day lily, the fleur-de-lis and the canna can be increased, the growing day lily, fleur-de-lis and canna are healthier and stronger and can efficiently absorb the heavy metal lead and cadmium in the soil, the rate of absorbing the heavy metal lead and cadmium through the day lily, and the fleur-de-lis and the canna is increased by 30% or above compared with the absorbing rate of ordinarily-planted fleur-de-lis, day lily and canna. Accordingto the heavy metal lead-cadmium polluted soil biological remediation method, a certain scientific basis is provided for heavy metal polluted soil plant remediation and construction of an agro-ecologydemonstration project foundation.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control and restoration, and in particular relates to a plant-based bioremediation method for heavy metal lead and cadmium contaminated soil. Background technique [0002] Soil heavy metal pollution refers to the high content of heavy metals in soil due to human activities, usually with a concentration greater than 5g / m2 3 and adversely affect the quality of the ecological environment. Common heavy metals that pollute the soil include lead, zinc, nickel, copper, chromium, cadmium, mercury and other elements, among which lead and cadmium pollution are the most common. These two elements are the main pollution sources of heavy metal pollution in soil caused by atmospheric dust, and they are also common sources of pollution discharged by various mines through dust and waste water in the process of mining, beneficiation and smelting. Heavy metal pollution has the characteristics of concealmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 郭晖周慧庄静静王晓冰李振华许飞
Owner XINXIANG UNIV
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