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Arsenic-polluted place soil restoration stabilizer

An arsenic pollution and stabilizer technology, applied in the restoration of polluted soil, soil conditioning materials, applications, etc., can solve the problems of high cost, secondary soil pollution, unfavorable for soil post-treatment use, etc. Subsequent use, stable effect, good effect

Inactive Publication Date: 2014-08-27
上海纺织建筑设计研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the closest prior art, the invention patent (CN101695711B) discloses a chemical fixation 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
Invention patent (CN101879521A) discloses a treatment method for arsenic-contaminated soil. The pH of the soil is adjusted to pH 8-10 with alkaline materials, and then iron salt is added for treatment. This method is not conducive to soil post-treatment due to changing the pH of the soil.
Invention patent (CN102233354A) discloses a treatment method for repairing 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 alkaline chemical substances , will lead to secondary pollution of the soil
Invention patent (CN102974601A) discloses a stabilizer for arsenic-contaminated soil and a method for repairing contaminated soil. The stabilizer is prepared by using montmorillonite, calcium oxide, magnesium carbonate, and iron filings as raw materials. During use, the addition of calcium oxide changes the soil pH, not conducive to soil post-treatment use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Bentonite and iron powder are passed through 200 meshes and set aside. The soil sample for testing is high arsenic-containing soil at a glass factory site in Wuhan, with an arsenic content of 3999mg / kg. The samples were air-dried naturally, gravel and plant residues were picked out, ground through a 100-mesh sieve, and thoroughly mixed for use. Take 5g of bentonite, 1.2g of calcium sulfate, iron powder:arsenic (molar ratio) of 6:1, and 10g of plant ash, add them to 500g of arsenic-contaminated soil, first dry mix with a glass rod, then add 250ml of deionized water, stir, Semi-sealed curing for 7 days, the pH after stabilization treatment was 7.1. In this example, the EPA method 1311 (Toxicity Characteristic Leaching Procedure, TCLP) of the US Environmental Protection Agency was used to analyze the stabilization effect of arsenic and other heavy metals after treatment. The test results are shown in Table 1.

[0025] Table 1 Leaching test results of arseni...

Embodiment 2

[0028] Embodiment 2: Bentonite and iron powder are passed through 200 mesh, and set aside. The soil sample for testing is the arsenic-containing soil of a coking plant site in Shanghai, and the arsenic content is 411mg / kg. The samples were air-dried naturally, gravel and plant residues were picked out, ground through a 100-mesh sieve, and thoroughly mixed for use. Take 5g of bentonite, 0.5g of calcium sulfate, iron powder:arsenic (molar ratio) of 6:1, and 4g of plant ash, add them to 500g of arsenic-contaminated soil, first dry mix with a glass rod, then add 250ml of deionized water, stir, Semi-sealed curing for 7 days, the pH after stabilization treatment was 7.3. In this example, the EPA method 1311 (Toxicity Characteristic Leaching Procedure, TCLP) of the US Environmental Protection Agency was used to analyze the stabilization effect of arsenic and other heavy metals after treatment. The test results are shown in Table 2.

[0029] Table 2 Leaching test results of arsenic-...

Embodiment 3

[0032] Embodiment 3: Bentonite and iron powder are passed through 200 meshes and set aside. The soil sample for testing is arsenic-containing soil from a mine tailings site in Chenzhou, Hunan, with an arsenic content of 6833 mg / kg. The samples were air-dried naturally, gravel and plant residues were picked out, ground through a 100-mesh sieve, and thoroughly mixed for use. Take 6g of bentonite, 2g of calcium sulfate, iron powder: arsenic (molar ratio) 6:1, and 15g of plant ash, add it to 500g of arsenic-contaminated soil, first dry mix it with a glass rod, then add 250ml of deionized water, stir, half Sealed and maintained for 7 days, the pH was 6.9 after stabilization treatment. In this example, the EPA method 1311 (Toxicity Characteristic Leaching Procedure, TCLP) of the US Environmental Protection Agency was used to analyze the stabilization effect of arsenic and other heavy metals after treatment. The test results are shown in Table 3.

[0033] Table 3 Leaching test resu...

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Abstract

The invention belongs to the technical field of polluted soil treatment and restoration and discloses an arsenic-polluted place soil restoration stabilizer. The arsenic-polluted place soil restoration stabilizer is characterized in that bentonite mass is 1-5% arsenic-polluted soil mass, calcium sulfate mass is 0.1-1% arsenic-polluted soil mass, a mole ratio of iron powder to arsenic in polluted soil is in a range of 3: 1 to 10: 1, plant ash mass is 2-8% arsenic-polluted soil mass, bentonite is dried in the air, crushed and sieved by a sieve of 100-200 meshes, iron powder fineness is in a range of 100-200 meshes, the arsenic-polluted place soil restoration stabilizer is added into the arsenic-polluted soil, then the mixture is subjected to dry stirring for full mixing and then is added with water so that soil water content is in a range of 30-35% and then the mixture is subjected to stirring. The arsenic-polluted place soil restoration stabilizer utilizes cheap and easily available raw materials, has good stabilization effects, substantially does not change a polluted soil pH value, can supply nutrients for polluted soil and is conducive to soil treatment and follow-up utilization.

Description

technical field [0001] The invention belongs to the technical field of treatment and restoration of polluted soil, and in particular relates to a stabilizer for the restoration and treatment of arsenic-polluted soil. Background technique [0002] In recent years, environmental pollution and health hazards caused by heavy metals have attracted widespread attention. As one of the "five poisonous elements" (mercury, cadmium, lead, chromium, arsenic), arsenic (As) has received special attention for its environmental hazards and health safety. Geochemical processes in the natural environment and human activities, such as metallurgy, industrial wastewater discharge, pesticides, etc., have combined to lead to increasing arsenic concentrations in soil and groundwater. [0003] Arsenic has been listed as the second largest inorganic pollutant in US Superfund remediation contaminated sites. Arsenic in contaminated soil, sediment and sludge is a major source of arsenic in food and wa...

Claims

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Application Information

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IPC IPC(8): C09K17/06B09C1/08B09C1/00A62D3/38A62D101/43
Inventor 卢聪张庆吕东陈斐王军东金平良祝开天张伟龚成晨郑姝陈思吟夏雷廷
Owner 上海纺织建筑设计研究院有限公司
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