A compound stabilizer agent for hexavalent chromium polluted soil and its application

A technology for polluted soil and hexavalent chromium, which is applied in the field of hexavalent chromium pollution control, can solve the problems of low hexavalent chromium toxicity leaching concentration, secondary pollution microbial method, destroying the function of soil vegetation, etc., and achieves better effect and reduction reaction. Gentle, long-lasting results

Active Publication Date: 2021-04-13
湖南中核勘探有限责任公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems in the prior art that the chemical reduction method and the chemical leaching method destroy the function of soil vegetation, easily introduce secondary pollution, and the microbial method cannot efficiently and thoroughly repair hexavalent chromium-contaminated soil, the purpose of the present invention is to provide a Composite stabilization agent for hexavalent chromium-contaminated soil, after the reduction and stabilization treatment of hexavalent chromium-contaminated soil is carried out through the synergistic effect between the components of the composite stabilization agent of the present invention, the total amount of hexavalent chromium reaches the national standard; The toxic leaching concentration of chromium is very low, and it will not change the acidity and alkalinity of the soil environment, and will not introduce a large amount of inorganic salts to cause salinization of the soil environment. At the same time, the agent will bring carbon sources to the indigenous microorganisms in the soil environment and activate the indigenous microorganisms

Method used

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  • A compound stabilizer agent for hexavalent chromium polluted soil and its application
  • A compound stabilizer agent for hexavalent chromium polluted soil and its application
  • A compound stabilizer agent for hexavalent chromium polluted soil and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Composition and content of compound stabilizer:

[0032] Nano zero-valent iron 25 parts; ferrous sulfide 15 parts; calcium polysulfide 15 parts; ferrous citrate 10 parts; oxalic acid 10 parts; lactic acid 10 parts; glucose 8 parts; edible oil 8 parts; bentonite 10 parts; zeolite 10 parts ; 10 parts of medical stone; 12 parts of EDTA; 12 parts of tartaric acid.

[0033] The soil used in the test is the soil to be repaired in the Changsha chromium salt plant soil restoration and treatment project. The soil is slightly polluted. The composite stabilizer was mixed with chromium-contaminated soil, water was added to reach 90% of the water holding capacity of the mixture, and anaerobic curing was carried out for 7 days. The situation in lightly polluted soil before and after restoration was compared as shown in Table 1:

[0034] Table 1 Comparison of the situation in the contaminated soil before and after remediation

[0035]

[0036]The data in Table 1 shows that the pH...

Embodiment 2

[0038] Composition and content of compound stabilizer agent:

[0039] Nano zero-valent iron 30 parts; ferrous sulfide 20 parts; calcium polysulfide 20 parts; ferrous citrate 15 parts; oxalic acid 12 parts; lactic acid 12 parts; glucose 10 parts; edible oil 10 parts; bentonite 12 parts; zeolite 12 parts ; 12 parts of medical stone; 15 parts of EDTA; 15 parts of tartaric acid.

[0040] The soil used in the test is the soil to be repaired in the Changsha Chromium Salt Factory soil restoration and treatment project. The soil is heavily polluted. The dosage of the composite stabilizer is 3wt% of the chromium-contaminated soil. Stir and mix the components evenly by weight, and then directly mix the composite The stabilizer was mixed with chromium-contaminated soil, water was added to 95% of the water-holding capacity of the mixture, and anaerobic curing was carried out for 7 days. The comparison of the situation in heavily polluted soil before and after restoration is shown in Table...

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Abstract

The invention discloses a composite stabilizing agent for hexavalent chromium-contaminated soil and its application, which comprises 20-50 parts of nanometer zero-valent iron; 10-40 parts of ferrous sulfide; and 10-40 parts of calcium polysulfide; 8-20 parts of ferrous citrate; 5-20 parts of oxalic acid; 5-20 parts of lactic acid; 3-15 parts of glucose; 3-15 parts of edible oil; 5-20 parts of bentonite; 5-20 parts of zeolite; 5 parts of medical stone ~20 parts; 8~20 parts of EDTA; 8~20 parts of tartaric acid. After the composite stabilizing agent of the present invention performs reduction and stabilization treatment on hexavalent chromium-contaminated soil, the total amount of hexavalent chromium reaches the national standard; A large amount of inorganic salts will be introduced to lead to salinization of the soil environment. At the same time, the chemical will bring carbon sources to the indigenous microorganisms in the soil environment and activate the indigenous microorganisms.

Description

technical field [0001] The invention belongs to the field of hexavalent chromium pollution control, and relates to a compound stabilization agent for hexavalent chromium polluted soil and an application thereof. Background technique [0002] Chromium and chromium compounds are widely used in electroplating, metal processing, leather, dyes, steel and chemical industries. Chromium-containing wastewater discharged from the tanning industry, industrial chromium slag dissolved in water can pollute many surrounding soil and groundwater, chromium has been considered as an important environmental pollutant. Chromium usually exists in nature in trivalent and hexavalent forms, and hexavalent chromium is the most toxic to organisms and humans. Hexavalent chromium is a highly toxic element and is highly carcinogenic. The lethal dose of hexavalent chromium compounds in human body is about 1.5g after oral administration. If the hexavalent chromium content in water exceeds 0.1mg / L, it wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10C09K109/00
CPCB09C1/08B09C1/10C09K17/40C09K2109/00
Inventor 莫超李盈芳钟宇汤欢
Owner 湖南中核勘探有限责任公司
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