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Method for remediating lead-polluted soil by microalgae-montmorillonite compound

A technology of montmorillonite compound and lead-contaminated soil, which is applied in the restoration of contaminated soil, etc., can solve the problems affecting the application and popularization of microbial remediation technology, the limited tolerance of soil heavy metals, and the effect of soil microbial remediation. Significant economic and ecological effects, excellent soil lead pollution passivation ability, and excellent carbon sequestration ability

Pending Publication Date: 2021-11-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microalgae are commonly found in the shallow soil layer and are the main component of the soil microbial community. However, microorganisms usually have limited tolerance to soil heavy metals. Soil heavy metals are often enriched in high concentrations in the shallow layer, which will greatly affect the restoration of soil microorganisms. Effect
In order to solve this problem, in practice, microorganisms and plants are often combined to enhance their remediation effect on heavy metal-contaminated soils, but plants will narrow the scope of application due to the influence of climate and growth cycle, which will affect the application and quality of microbial remediation technology. universal

Method used

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  • Method for remediating lead-polluted soil by microalgae-montmorillonite compound
  • Method for remediating lead-polluted soil by microalgae-montmorillonite compound
  • Method for remediating lead-polluted soil by microalgae-montmorillonite compound

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for repairing lead-contaminated soil with a microalgae-montmorillonite compound, specifically comprising the following steps:

[0023] (1) Preparation of montmorillonite suspension: Add 150 mg of montmorillonite into 100 mL of water, and stir evenly to obtain a montmorillonite suspension.

[0024] (2) Preparation of microalgae-montmorillonite composite: Take 75mg of montmorillonite and add it to 100mL of 0.75g / L algae liquid cultured in advance, adjust the pH to 6-7, and stir evenly at room temperature at a speed of 180-220rpm After 24 hours, the microalgae-montmorillonite complex was obtained, wherein the dry weight ratio of microalgae and montmorillonite was 1:1.

[0025] (3) Preparation of contaminated soil: take some soil that has passed through a 45-mesh sieve, add Pb(NO 3 ) 2 An aqueous solution is used to make the soil moisture rate 28-32%, and it is fully mixed evenly so that the Pb treatment concentration is 1000mg / kg. Lead-contaminated soil samples...

Embodiment 2

[0034] (1) Preparation of montmorillonite suspension: Add 150 mg of montmorillonite into 100 mL of water, and stir evenly to obtain a montmorillonite suspension.

[0035] (2) Preparation of microalgae-montmorillonite composite: Take 100mg of montmorillonite and add it to 100mL of 0.5g / L algae liquid cultured in advance, adjust the pH to 6-7, and stir evenly at room temperature at 180-220rpm After 24 hours, a microalgae-montmorillonite complex was obtained, wherein the dry weight ratio of microalgae to montmorillonite was 1:2.

[0036] (3) Preparation of contaminated soil: take some soil that has passed through a 45-mesh sieve, add Pb(NO 3 ) 2 An aqueous solution is used to make the soil moisture rate 28-32%, and it is fully mixed evenly so that the Pb treatment concentration is 1000mg / kg. Lead-contaminated soil samples were aged for 14 days at room temperature.

[0037] (4) Effect monitoring:

[0038] Blank group: Weigh 214.3g of the above-mentioned polluted soil, spread t...

Embodiment 3

[0045](1) Preparation of montmorillonite suspension: Add 150 mg of montmorillonite into 100 mL of water, and stir evenly to obtain a montmorillonite suspension.

[0046] (2) Preparation of microalgae-montmorillonite composite: Take 125mg of montmorillonite and add it to 100mL of 0.25g / L algae liquid cultured in advance, adjust the pH to 6-7, and stir evenly at room temperature at 180-220rpm After 24 hours, the microalgae-montmorillonite complex was obtained, wherein the dry weight ratio of microalgae and montmorillonite was 1:5.

[0047] (3) Preparation of contaminated soil: take some soil that has passed through a 45-mesh sieve, add Pb(NO 3 ) 2 Aqueous solution, so that the soil moisture content is 28-32%, fully mixed evenly, so that the Pb treatment concentration is 1000mg / kg. The lead-contaminated soil samples were aged for 14 days at room temperature.

[0048] (4) Effect monitoring:

[0049] Blank group: Weigh 214.3g of the above-mentioned polluted soil, spread the soi...

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Abstract

The invention relates to a method for remediating lead-polluted soil by a microalgae-montmorillonite compound, which comprises the steps of S1, putting powdery montmorillonite into a microalgae solution which is cultured in advance, uniformly mixing and reacting to obtain a microalgae-montmorillonite compound mixed solution, and controlling the dry weight ratio of microalgae to montmorillonite to be 1: (1-5); and S2, adding the obtained microalgae-montmorillonite compound mixed solution into the lead-polluted soil, and carrying out remediation treatment for a period of time. The method can effectively reduce the free state and reducible state of lead in the high-concentration lead-polluted soil, and has excellent lead-polluted soil passivation performance. The microalgae-montmorillonite compound is environment-friendly, does not cause secondary pollution and can increase soil nutrients, and the microalgae belongs to autotrophic organisms and has relatively low nutritional requirements, so that the method has remarkable economic and ecological effects.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, and in particular relates to a method for repairing lead-contaminated soil with a microalgae-montmorillonite compound. Background technique [0002] Soil is the basis for human survival. With the intensification of human activities, the problem of soil heavy metal pollution has become more and more serious. Soil heavy metals cannot be degraded and will be enriched in the food chain, eventually endangering human health. Among them, soil lead pollution has been widely reported and considered as a priority element with potential toxicity. Soil lead pollution mainly comes from man-made activities such as metallurgy, mining, smelting, vehicle exhaust emissions, soil fertilization and electronic waste recycling. After entering the human body, it will cause harm to multiple systems such as nerves, hematopoiesis, digestion, kidneys, cardiovascular and endocrine. pose a serious threat to public...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/00B09C1/10
Inventor 夏令谭佳琦宋少先
Owner WUHAN UNIV OF TECH
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