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Arsenic pollution soil stabilizer and method for repairing contaminated soil

A soil stabilizer, a technology for polluted soil, applied in the restoration of polluted soil and other directions, can solve the problems of secondary soil pollution, the use of unfavorable soil post-treatment, and high costs

Inactive Publication Date: 2013-03-20
CECEP L&T ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent (CN101695711B) discloses a chemical immobilization material suitable for soil arsenic, which uses nano-titanium dioxide and zero-valent iron powder as the main raw materials, and there is a problem of high cost in use
The invention patent (CN 101879521A) discloses a treatment method for arsenic-contaminated soil. The pH of the soil is adjusted to 8-10 with alkaline substances, and then iron salt is added for treatment. This method needs to change the pH of the soil, which is not conducive to the post-treatment of the soil. use
Invention patent (CN 102233354A) discloses a treatment method for remediating arsenic-contaminated soil. The activated red mud stabilizer is prepared by activating iron salt and ferrous salt. Since red mud contains a variety of trace radioactive substances and strong alkalinity Chemical substances that can cause secondary pollution of the soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: The montmorillonite was roasted at 200°C for 2 hours, ground after cooling, passed through a 300-mesh sieve, and set aside; iron filings was passed through a 300-mesh sieve, set aside. Take 4g of montmorillonite, 2g of calcium oxide, 3g of magnesium carbonate, and 1g of iron filings, add them to 1000g of arsenic-contaminated soil, stir evenly with a glass rod, add 500ml of water, stir, and let the mixture stand at room temperature for 48 hours. The toxicity characteristic Leaching Procedure (TCLP) of the Environmental Protection Administration (EPA method 1311) detects the release of heavy metals in arsenic-contaminated soil. The test results are shown in Table 1.

[0025] Table 1 Leaching test results of arsenic-contaminated soil (mg / L)

[0026] project arsenic copper zinc lead chromium cadmium HG unprocessed 0.59 3.24 4.67 0.87 0.03 not detected not detected after stabilization 0.06 0.31 2.43 0.12 not detected...

Embodiment 2

[0028] Example 2: Roast montmorillonite at 300° C. for 1.5 h, grind after cooling, pass through a 200-mesh sieve, and set aside; iron filings pass through a 200-mesh sieve, set aside. Take 3g of montmorillonite, 3g of calcium oxide, 2.5g of magnesium carbonate, and 1.5g of iron filings, add them to 500g of arsenic-contaminated soil, stir evenly with a glass rod, add 250ml of water, stir, and let the mixture stand at room temperature for 72 hours. According to EPA method 1311, the toxicity characteristic Leaching Procedure (TCLP) of the United States Environmental Protection Agency, the release of heavy metals in remediation arsenic-contaminated soil was detected. The test results are shown in Table 2.

[0029] Table 2 Leaching test results of arsenic-contaminated soil (mg / L)

[0030] project arsenic copper zinc lead chromium cadmium HG unprocessed 1.26 27.54 30.79 1.48 0.15 not detected not detected after stabilization 0.23 6.94 10....

Embodiment 3

[0032] Example 3: Calcining montmorillonite at 300° C. for 1.5 h, grinding after cooling, and passing through a 200-mesh sieve for future use; passing iron filings through a 200-mesh sieve for future use. Take 4g of montmorillonite, 2g of calcium oxide, 2g of magnesium carbonate, and 2g of iron filings, add them to 300g of arsenic-contaminated soil, stir evenly with a glass rod, add 200ml of water, stir, and let the mixture stand at room temperature for 96 hours. The toxicity characteristic Leaching Procedure (TCLP) of the State Environmental Protection Administration (EPA method 1311, the toxicity characteristic Leaching Procedure (TCLP)) detects the release of heavy metals in the remediation of arsenic-contaminated soil. The test results are shown in Table 3.

[0033] Table 3 Leaching test results of arsenic-contaminated soil (mg / L)

[0034] project arsenic copper zinc lead chromium cadmium HG

[0035] unprocessed 3.85 48.67 61.32 3....

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Abstract

The invention discloses an arsenic pollution soil stabilizer and a method for repairing contaminated soil, belonging to the technical field of arsenic pollution soil remediation and repair. The method for repairing contaminated soil is characterized by comprising the following steps of: preparing a stabilizer by taking low-cost montmorillonite, calcium oxide, magnesium carbonate and scrap iron as raw materials, adding the stabilizer into the arsenic contaminated soil according to a certain ratio, uniformly mixing, adding a certain amount of water, stirring, and culturing for a certain time to achieve the aim of repairing the arsenic contaminated soil. The arsenic pollution soil stabilizer has the characteristics that the finished product comprises the following components by weight based on the 100kg of dry basis: 30-40kg of montmorillonite, 20-30kg of calcium oxide, 20-30kg of magnesium carbonate and 10-20kg of scrap iron. The arsenic pollution soil stabilizer can effectively solve the problem that the arsenic pollution soil is polluted, has the characteristics of low cost, high repair efficiency, easy operation method and the like and is suitable for repairing the arsenic pollution soil.

Description

technical field [0001] The invention belongs to the technical field of treatment and repair of polluted soil, in particular to an arsenic-polluted soil stabilizer and a method for repairing polluted soil. Background technique [0002] Arsenic is widely distributed in nature, but the arsenic content in the earth's crust is low, and its abundance is only 4.0 (the abundance of Si is 106). The world's arsenic reserves are about 2 million tons, and China accounts for 70% of the proven arsenic resources, ranking first in the world. It is mainly distributed in Guangxi, Yunnan and Hunan provinces, accounting for 65.7% of the country's total reserves. [0003] The anthropogenic sources of arsenic pollution are mainly agricultural and industrial production. The sources of arsenic pollution in agriculture mainly come from pesticides and fertilizers with arsenic compounds as the main components. Arsenic-containing pesticides and fertilizers, as well as herbicides, are used directly i...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 李萌余红辉王浩张翔宇宋宝华朱彤姚一夫孙璐
Owner CECEP L&T ENVIRONMENTAL TECH
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