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Mercury Contaminated Soil Remediation Agent and Its Application

A soil remediation agent and mercury-polluted technology, which is applied in the field of remediation, especially in the field of mercury-contaminated soil, can solve the problems of high cost of remediation agents, high cost, and many processes, so as to realize the resource utilization of solid waste, reduce the pressure on the environment, good repair effect

Active Publication Date: 2020-06-23
甘肃天农一禾农业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent application with the application number of 201410255445.4 discloses a solidified and stable restoration agent for heavy metal-contaminated soil. The restoration agent is composed of gypsum, magnesium oxide, and diatomaceous earth. According to the report of this patent, the repairing agent has a better effect on mercury removal. However, the proportion of magnesium oxide in the repairing agent should reach about 75%, which leads to a higher cost of repairing agent and is economical. Poor sex
The Chinese invention patent application with the application number 201510294302.9 discloses a solidification and stabilization method for mercury-contaminated soil. The method mainly includes a chloride salt addition process, a pH adjustment process, a mixing process, an activator addition process, a digestion molding process, and a crushing process. This treatment method can solidify and stabilize mercury-contaminated soil with different pollution levels, and can also co-solidify and stabilize other heavy metals in polluted soil. However, this method has many procedures, complicated process, high cost and poor economy.

Method used

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  • Mercury Contaminated Soil Remediation Agent and Its Application
  • Mercury Contaminated Soil Remediation Agent and Its Application
  • Mercury Contaminated Soil Remediation Agent and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Remediation of contaminated soil in a certain place in Gansu

[0028] The pH value and the toxicity of mercury leaching by the sulfuric acid and nitric acid method (HJ / T 299-2007) were tested and analyzed by the glass electrode method (NY / T 1121.2-2006) and atomic fluorescence method (HJ 702-2014).

[0029] Take 60 parts of gypsum and 40 parts of calcium carbide slag (15% moisture content), mix them evenly, heat preservation for 1d, grind and screen, and pass through a 100 mesh sieve to obtain a granular mercury contaminated soil remediation agent. The tested soil remediation agent has a mercury content of 0.3ppb, an arsenic content of 0.01ppm, a cadmium content of 0.5ppb, a lead content of 0.2ppm, and a chromium content of 0.7ppm.

[0030] Add the mercury-contaminated soil remediation agent to the mercury-contaminated soil at an additive amount of 3%, add water to a water content of 30%, and leave it for 5 days under this condition. The pH value of the soil and the...

Embodiment 2

[0034] Example 2 Remediation of contaminated sediment in a river in Gansu

[0035] The pH value and the toxicity of mercury leaching by the sulfuric acid and nitric acid method (HJ / T 299-2007) were tested and analyzed by the glass electrode method (NY / T 1121.2-2006) and atomic fluorescence method (HJ 702-2014).

[0036] Take 50 parts of gypsum and 50 parts of calcium carbide slag (20% water content), mix them evenly, heat preservation for 1d, grind and screen, and pass through a 100 mesh sieve to obtain a granular mercury contaminated soil remediation agent.

[0037] Add the obtained granular mercury contaminated soil remediation agent to the contaminated bottom sludge of the river at the addition amount of 6%, add water to control the moisture content of 30%, and stand for 7d under this condition. The pH value of the sediment and the leaching concentration of mercury were tested before and after the restoration. The test results are shown in Table 2. After restoration, the leaching...

Embodiment 3

[0059] Example 3 Remediation of contaminated soil in a certain place in Gansu

[0060] The pH value and the toxicity of mercury leaching by the sulfuric acid and nitric acid method (HJ / T 299-2007) were tested and analyzed by the glass electrode method (NY / T 1121.2-2006) and atomic fluorescence method (HJ 702-2014).

[0061] Take 70 parts of gypsum and 30 parts of calcium carbide slag (20% water content), mix them evenly, heat preservation and curing for 1d, grind and screen, and pass through a 100-mesh sieve to obtain a granular mercury contaminated soil remediation agent.

[0062] Add the mercury-contaminated soil remediation agent to the mercury-contaminated soil at an additive amount of 3%, add water to a water content of 30%, and leave it for 5 days under this condition. The pH value of the soil and the leaching concentration of mercury were tested before and after the restoration. The test results are shown in Table 6. After remediation, the leaching concentration of mercury in...

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Abstract

The invention discloses a mercury-polluted soil remediation agent and an application thereof. According to a formula, the soil remediation agent is prepared from raw materials in parts by weight: 30-70 parts of gypsum and 30-50 parts of carbide slag containing 10%-20% of water. The application method of the mercury-polluted soil remediation agent to remediation of mercury-polluted soil comprises the steps: mixing the mercury-polluted soil remediation agent with the mercury-polluted soil; controlling the water content at 20%-40% by adding water; and carrying out curing for 3-10 days. Compared with the existing mercury-polluted soil remediation agent with the same effect, the mercury-polluted soil remediation agent disclosed by the invention has an obvious cost advantage and is also used for realizing the recycle of solid wastes, reducing environment pressure so as to be an efficient and economic mercury-polluted soil remediation agent.

Description

Technical field [0001] The invention relates to a remediation agent specially aimed at the remediation of mercury-contaminated soil and a method for using the mercury-contaminated soil remediation agent to remediate especially mercury-contaminated soil. Background technique [0002] Mercury is a silver-white metal, which is liquid at room temperature. It is one of the heavy metals commonly used in batteries, mining and other industries. The food chain has a strong ability to accumulate mercury, its content can accumulate in organisms, and mercury is easily absorbed by the skin, breathing and digestive tract. Mercury in blood and tissues can bind to sulfhydryl groups in proteins and enzyme systems, inhibit their functions, or even inactivate them, and can damage central nervous tissue and mouth, mucosa and teeth. [0003] In the prior art, the treatment methods of mercury-contaminated soil mainly include a soil method, a solidification / stabilization method, a water washing method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/06
CPCB09C1/08C09K17/06
Inventor 赵粉红谢爱军高素萍
Owner 甘肃天农一禾农业有限公司