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Site soil heavy metal passivator and preparation method thereof

A heavy metal passivator and passivator technology, applied in the field of soil pollution remediation, can solve problems such as unsatisfactory adsorption effect, short duration of heavy metal adsorption, and easy repeated pollution

Pending Publication Date: 2022-04-05
IRONMAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the biochar-based passivator provided by the invention can increase soil alkalinity and reduce the proportion of soil effective mercury, its adsorption effect on heavy metals such as lead, cadmium, and chromium is not ideal, especially due to the short duration of heavy metal adsorption and easy pollution. repeated problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A field soil heavy metal passivator is prepared through the following steps.

[0025] 1) A total of 15 parts by mass of cow dung biochar and rice straw biochar were mixed and ground, and sieved through a 100-mesh sieve to a size below 0.150 mm.

[0026] 2) A total of 20 parts by mass of clay mineral montmorillonite and kaolin were mixed and pulverized, and sieved through a 200-mesh sieve to a size below 0.075 mm.

[0027] 3) Mix the biochar and clay minerals sieved in the above step 1) and step 2), and place them in an alkaline solution whose pH value is adjusted to 9 by sodium hydroxide to form a mixed solution A.

[0028] 4) The above mixed solution A was placed in a water bath constant temperature oscillator, and oscillated at an oscillation frequency of 40r / min and a water temperature of 50°C for 3h to complete the modification, and a mixed solution B was obtained.

[0029] 5) Make 0.0005 parts by mass of non-ionic polyacrylamide into a solution with a mass fractio...

Embodiment 2

[0032] A field soil heavy metal passivator is prepared through the following steps.

[0033] 1) A total of 40 parts by mass of cow dung biochar, rice straw biochar and corn straw biochar were mixed and pulverized, and sieved through a 100-mesh sieve to a size below 0.150 mm.

[0034] 2) A total of 40 parts by mass of clay mineral illite, palygorskite and sepiolite were mixed and pulverized, and sieved through a 200-mesh sieve to a size below 0.075 mm.

[0035] 3) Mix the biochar and clay minerals sieved in step 1) and step 2) above, and place them in an alkaline solution whose pH value is adjusted to 9 with sodium carbonate to form a mixed solution A.

[0036] 4) The above mixed solution A was placed in a water bath constant temperature oscillator, and oscillated at an oscillation frequency of 40r / min and a water temperature of 50°C for 3h to complete the modification, and a mixed solution B was obtained.

[0037] 5) Make 0.002 parts by mass of non-ionic polyacrylamide into a...

Embodiment 3

[0040] A field soil heavy metal passivator is prepared through the following steps.

[0041] 1) Crush 30 parts by mass of rice straw biochar, and sieve it through a 100-mesh sieve to a size below 0.150 mm.

[0042] 2) Pulverize 25 parts by mass of clay mineral montmorillonite, and sieve through a 200-mesh sieve to a size below 0.075 mm.

[0043] 3) Mix the biochar and clay minerals screened in step 1) and step 2) above, and place them in an alkaline solution whose pH value is adjusted to 9 by sodium bicarbonate to form a mixed solution A.

[0044] 4) The above mixed solution A was placed in a water bath constant temperature oscillator, and oscillated at an oscillation frequency of 40r / min and a water temperature of 50°C for 3h to complete the modification, and a mixed solution B was obtained.

[0045] 5) Make 0.0015 parts by mass of non-ionic polyacrylamide into a solution with a mass fraction of 1%, add it to the above mixed solution B, mix well and let it settle for 10 minute...

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PUM

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Abstract

The invention discloses a site soil heavy metal passivator and a preparation method thereof, and relates to the technical field of soil pollution remediation. The invention aims to solve the problems of poor adsorption effect, short lasting time, easy repeated pollution, complex modification process and high cost of the existing soil heavy metal passivator. The method comprises the following steps: 1) crushing 15-40 parts by mass of biochar, and screening the crushed biochar to 0.150 mm or below through a screen; (2) crushing 20-40 parts by mass of clay mineral, and screening until the particle size is less than 0.075 mm; 3) mixing the screened biochar and clay mineral, and placing the mixture in an alkaline solution to form a mixed solution A; the preparation method comprises 1, preparing a mixed solution A, 2, carrying out alkaline modification on the mixed solution A in a constant temperature reaction container to obtain a mixed solution B, 3, preparing 0.0005-0.002 part by mass of nonionic polyacrylamide into a solution, adding the solution into the mixed solution B, uniformly mixing the solution and carrying out standing settlement, and 4, carrying out suction filtration, taking a filter cake, carrying out natural air drying on the filter cake, adding 10-20 parts by mass of an acid-base regulator and uniformly mixing the filter cake and the acid-base regulator.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a field soil heavy metal passivator and a preparation method thereof. Background technique [0002] Soil is an important resource that human beings rely on for survival and development, and the basis for the existence of the entire ecosystem. With the rapid improvement of the level of industrialization and urbanization, urban planning is constantly updated, and a large number of industrial enterprises are facing the problem of upgrading or relocation. Enterprises may produce a large amount of heavy metal pollution during the production process for many years, which will cause great harm to the soil under the industrial site and endanger the lives of surrounding residents and the next land user. Therefore, before reusing a site polluted by heavy metals, it is necessary to remediate the soil in the site to meet the corresponding requirements for reuse. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K17/08
Inventor 林茂宏农海涛戴龙张起源荣伍阮博黄石光
Owner IRONMAN ENVIRONMENTAL TECH CO LTD