Repair method for mercury-polluted soil

A remediation method and mercury pollution technology, applied in the field of remediation of mercury-contaminated soil, can solve the problems of high energy consumption, soil structure damage, and high temperature, and achieve the effects of simple operation, reduction of mercury content, and short treatment period.

Inactive Publication Date: 2016-03-23
陕西清扬环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the previous heat treatment method removes mercury pollution, the required temperature is high (700-800°C), the treatment time is often longer than 1 hour, and the required energy consumption is high
And the high temperature treatment seriously damages the structure of the soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In an embodiment of the present invention, a method for remediating mercury-contaminated soil comprises the following steps:

[0033] (1) Pretreatment of surface soil: Plow the surface soil 25 cm deep from the surface of the mercury-contaminated soil, air-dry it until the moisture content is lower than 10%, grind it, and pass it through a 150-mesh sieve to obtain the pretreated surface soil ,spare;

[0034] (2) Preparation of passivating agent: The passivating agent is composed of 40 parts of bentonite, 15 parts of hydroxyapatite, 3 parts of ammonium thiosulfate and 16 parts of calcium hydroxide according to the raw materials in parts by mass; the bentonite is sodium-based bentonite, The particle size of sodium bentonite is 300 mesh;

[0035] (3) Remediation of passivating agent: According to the amount of passivating agent added to be 5% of the surface soil mass, fully mix the passivating agent prepared in step (2) with the surface soil treated in step (1), and place ...

Embodiment 2

[0038] In an embodiment of the present invention, a method for remediating mercury-contaminated soil comprises the following steps:

[0039] (1) Surface soil pretreatment: plow the mercury-contaminated soil at a depth of 28 cm from the ground surface, air-dry it until the moisture content is lower than 10%, grind it, and pass it through a 100-mesh sieve to obtain the pretreated surface soil ,spare;

[0040] (2) Preparation of passivating agent: The passivating agent is composed of 55 parts of bentonite, 5 parts of hydroxyapatite, 8 parts of ammonium thiosulfate and 8 parts of calcium hydroxide according to the mass parts; the bentonite is sodium-based bentonite, The particle size of sodium bentonite is 250 mesh;

[0041] (3) Remediation of passivating agent: The amount of passivating agent added is 2% of the mass of the surface soil, the passivating agent prepared in step (2) is fully mixed with the surface soil treated in step (1), and placed for 20 days Until 70% of the me...

Embodiment 3

[0044] In an embodiment of the present invention, a method for remediating mercury-contaminated soil comprises the following steps:

[0045] (1) Pretreatment of surface soil: Plow the surface soil 30 cm deep from the surface of the mercury-contaminated soil, air-dry it until the moisture content is lower than 10%, grind it, and pass it through a 120-mesh sieve to obtain the pretreated surface soil ,spare;

[0046] (2) Preparation of passivating agent: The passivating agent is composed of 52 parts of bentonite, 9 parts of hydroxyapatite, 6 parts of ammonium thiosulfate and 10 parts of calcium hydroxide according to the raw materials in parts by mass; the bentonite is sodium-based bentonite, The particle size of sodium bentonite is 300 mesh;

[0047] (3) Remediation of passivating agent: The amount of passivating agent added is 3% of the surface soil mass, and the passivating agent prepared in step (2) is fully mixed with the surface soil treated in step (1), and placed for 18 ...

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Abstract

The invention discloses a repair method for mercury-polluted soil. The repair method comprises the following steps: ploughing up surface soil with a depth of 25-30 centimetres away from ground surface, of the mercury-polluted soil, air-drying, grinding and sieving to obtain pre-treated surface soil; forming a passivator from 40-55 parts of bentonite, 5-15 parts of hydroxyapatite, 3-8 parts of ammonium thiosulphate and 8-16 parts of calcium hydroxide in parts by mass; adequately and uniformly mixing the passivator with the treated surface soil according to an added amount which is 2-5% of the mass of the surface soil, of the passivator, standing for 10-20 days until mercury with a content of 70% in the surface soil is fixed, and completing passivator repair; and levelling the surface soil, planting Indian mustard, dissolving calcium thiocyanate in water and uniformly spraying the solution into the peripheral soil of the root systems of Indian mustard during the vigorous growth period of Indian mustard, and finally harvesting Indian mustard. The repair method disclosed by the invention is simple to operate, low in cost, short in remediation period, and suitable for application of repair for large-area mercury-polluted soil plants.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating mercury-contaminated soil. Background technique [0002] Mercury is the only liquid heavy metal at room temperature and is a global pollutant. Mercury is highly toxic and not bioavailable. Mercury vapor (elemental mercury) mainly causes damage to the lungs, central system, kidneys, etc., and can cause death in severe cases. Inorganic mercury (divalent mercury ions) mainly causes damage to the digestive tract, immune system and kidneys. Organic mercury (mainly methylmercury) is easily absorbed by the digestive tract, mainly causing neurotoxicity, brain and nervous system damage, and also has hereditary damage, so it is more toxic to pregnant women and fetuses. [0003] The large-scale use of mercury in industry and the burning of coal and waste incineration have resulted in serious mercury pollution. The global mercury pollution problem requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/105
Inventor 贺娟妮闫保明王青罗小宏郑荣
Owner 陕西清扬环境科技有限公司
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