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Restoration agent for heavy-metal Hg polluted soil, and preparation method and application method thereof

A technology for contaminated soil and remediation agent, applied in the field of quilts, can solve problems such as no reports of soil remediation agents, and achieve the effects of long-lasting remediation effect, simple process flow and quick effect.

Active Publication Date: 2015-11-11
INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] At present, there is no report on the preparation of composite heavy metal Hg polluted soil remediation agent by using modified NanoC and α palygorskite

Method used

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  • Restoration agent for heavy-metal Hg polluted soil, and preparation method and application method thereof
  • Restoration agent for heavy-metal Hg polluted soil, and preparation method and application method thereof
  • Restoration agent for heavy-metal Hg polluted soil, and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: the preparation of Hg contaminated soil remediation agent NTSHO new material

[0053] The ratio of parts by mass of the three components in the restoration agent (NTSHO) is: Modified NanoC: α palygorskite: quicklime + sodium bicarbonate mixture = 0.1~15 parts: 5~40 parts: 40~70 parts share.

[0054] The modification and preparation method of the NanoC are as follows:

[0055] a. Mix 16g of NanoC, 22.5mL of concentrated nitric acid with a concentration of 65%, and 80mL of potassium permanganate solution with a concentration of 0.5mol / L according to the ratio of mass parts 1:2:5, let stand and cool;

[0056] b. After the cooling material obtained in step a was left to oxidize at 90° C. for 2 hours, it was centrifugally filtered and cooled.

[0057] c. Repeatedly washing and centrifuging the material obtained in step b with deionized water until the pH value of the supernatant is stable at 6-7.

[0058] d. Dry the material obtained in step c to a constant ...

Embodiment 2

[0065] Example 2: Exploratory research on the optimal dosage of new materials (pot test)

[0066] The remediation agent (NTSHO) prepared in Example 1 was used to explore the optimal dosage of new materials for Hg-contaminated soil, and the effects of multiple remediation agent (NTSHO) addition concentrations on Hg-contaminated soil with different initial concentrations were investigated through pot experiments. The restorative effect, so as to determine the dosage of restorative agent (NTSHO).

[0067] The experimental conditions were set as follows: the initial concentration of Hg in the soil was 8.8 and 19.9ppm respectively; the addition amount (mass fraction) of restoration agent (NTSHO) was 0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, respectively. Among the common agricultural products, water spinach has a strong ability to accumulate Hg, and water spinach is one of the most commonly eaten vegetables in polluted sites and surrounding areas. Therefore, water spinach was used as an in...

Embodiment 3

[0083] Example 3: A typical demonstration of new materials used to repair soil in a severely Hg-polluted mining area in Fujian Province

[0084] A typical demonstration of using the remediation agent (NTSHO) in Example 1 to remediate severely Hg-polluted soil in a gold mining area in Fujian Province. The highest initial concentration of Hg in the soil is 79ppm, with an average of 8ppm. According to the conclusion of Example 2, the optimal addition amount of restoration agent (NTSHO) is 0.3% of the soil mass. A typical demonstration mainly examines the effect of different curing times on the restoration effect.

[0085] Typical demonstrations are divided into 3 groups. Group A: control group, no restoration agent added; Group B: addition of 0.3% restoration agent (NTSHO), aging for 1 month; Group C: addition of 0.3% restoration agent (NTSHO), aging for 3 months.

[0086] A typical demonstration restoration process flow chart is as follows: figure 2 As shown, the details are...

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Abstract

The invention discloses a restoration agent for heavy-metal Hg polluted soil, and a preparation method and application method thereof. The restoration agent is composed of the following components in parts by weight: 0.1-15 parts of modified NanoC, 5-40 parts of alpha-paligorskite and 40-70 parts of quicklime+sodium hyposulfite mixture. The NanoC is oxidized and modified by acidic potassium permanganate; and the alpha-paligorskite is prepared by modifying natural attapulgite by HNO3 solution immersion and high-temperature heat treatment. The application method of the restoration agent is as follows: the restoration agent accounts for 0.1-5.0% of polluted soil; as for the polluted soil with the THg concentration of less than 20 ppm, the addition amount is 0.3-0.5%; and the restoration agent is sufficiently and uniformly mixed with the soil in a plowing or stirring mode, and the water content of 10-30% relative to the total weight of the soil is kept for 1-3 months.

Description

technical field [0001] The invention relates to the technical field of remediation of soil polluted by heavy metals, in particular to a [0002] Remediation agent for heavy metal Hg polluted soil. Background technique [0003] Mercury (Hg) is a heavy metal that is harmful to the human body. There are many ways for Hg to enter the soil, such as atmospheric deposition, discharge of industrial wastewater and domestic sewage, industrial solid waste and urban garbage, and application of pesticides and fertilizers. Hg in the soil will migrate and diffuse with time, and undergo mutual transformation of chemical forms, especially the presence of methylmercury, which can pose a serious threat to the ecological environment, food safety and human health. Toxicology tests have proved that excessive intake of Hg can lead to mercury poisoning, causing serious damage to the central nervous system, and endangering the normal physiological functions of respiratory, digestive and urinary sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08
Inventor 陈明王蕊张佳文李小赛王新宇
Owner INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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