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Purification method of heavy metal contaminated soil

A technology for polluted soil and heavy metals, applied in the field of purification of heavy metal-contaminated soil, can solve problems such as remediation effect and socio-economic feasibility to be verified, bioremediation is slow, and soil functions are damaged, so as to reduce the risk of secondary pollution of heavy metals, Inexpensive raw materials, the effect of promoting growth

Inactive Publication Date: 2019-10-25
安徽禾美环保集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the effect of chemical remediation is remarkable, but the cost is high and there are environmental risks of destroying soil functions and causing secondary pollution; physical remediation is stable and thorough, but the amount of work is large; biological remediation is slow, and its advantages lie in simple operation and environmental friendliness The technology of safe use of crops has the advantages of not destroying soil characteristics, no ecological risk, and production while repairing. It has been promoted in heavy metal polluted farmlands in Hunan, Guangdong and other places, but its repair effect and social and economic feasibility need to be verified.

Method used

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  • Purification method of heavy metal contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A method for purifying heavy metal contaminated soil, comprising the following steps:

[0023] (1) 60 kg of biochar and 20 kg of bentonite were crushed through an 80-mesh sieve, and then mixed with 1 kg of rhamnolipid, 5 kg of composite bacterial agent, and 4 kg of heavy metal trapping agent to obtain heavy metal repair material sample 1;

[0024] (2) Plow the contaminated soil to a depth of 70 cm, spread a layer of repair material therein, cover the soil to a depth of 25 cm, and then lay a layer of repair material, and the thickness of each layer of repair material is 3 cm;

[0025] (3) Regularly detect the heavy metal content in the soil;

[0026] (4) After the heavy metal content in the soil is stabilized, recover the restoration materials from the soil.

[0027] The preparation method of the biochar is as follows: the plant stalks are chopped and put into a calciner, heated to 400° C., kept for calcination for 3 hours, then cooled naturally, and the biochar is coll...

Embodiment 2

[0032] A method for purifying heavy metal contaminated soil, comprising the following steps:

[0033] (1) 65kg of biochar and 17kg of bentonite were crushed through a 60-mesh sieve respectively, and then mixed with 1kg of rhamnolipid, 3kg of composite bacterial agent, and 2kg of heavy metal trapping agent to obtain heavy metal restoration material sample 2;

[0034] (2) Plow the polluted soil to a depth of 60 cm, spread a layer of repair material into it, cover the soil to a depth of 20 cm, and then spread a layer of repair material, and the thickness of each layer of repair material is 2 cm;

[0035] (3) Regularly detect the heavy metal content in the soil;

[0036] (4) After the heavy metal content in the soil is stabilized, recover the restoration materials from the soil.

[0037] The preparation method of the biochar is as follows: the plant stalks are chopped and put into a calciner, heated to 350° C., kept for 2 hours and then cooled naturally, and the biochar is collec...

Embodiment 3

[0042] A method for purifying heavy metal contaminated soil, comprising the following steps:

[0043] (1) 75kg of biochar and 23kg of bentonite were crushed through a 100-mesh sieve respectively, and then mixed with 2kg of rhamnolipid, 8kg of composite bacterial agent, and 5kg of heavy metal trapping agent to obtain heavy metal restoration material sample 3;

[0044] (2) Plow the contaminated soil to a depth of 80 cm, spread a layer of repair material into it, cover the soil to a depth of 30 cm, and then lay a layer of repair material, and the thickness of each layer of repair material is 4 cm;

[0045] (3) Regularly detect the heavy metal content in the soil;

[0046] (4) After the heavy metal content in the soil is stabilized, recover the restoration materials from the soil.

[0047] The preparation method of the biochar is as follows: the plant stalks are chopped and put into a calciner, heated to 450° C., kept for 4 hours and then cooled naturally, and the biochar is coll...

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Abstract

The invention discloses a purification method of heavy metal contaminated soil, which comprises the following steps: (1) crushing biochar and bentonite respectively, and then mixing with surfactant, composite bacterium agent and heavy metal collector to obtain heavy metal repairing material; (2) turning that contaminated soil deeply, paving a layer of repairing material into the contaminated soil,covering the soil and paving a layer of repairing material into the contaminated soil; (3) detecting the content of heavy metals in soil regularly; (4) recovering that remediation material from the soil after the heavy metal content in the soil is reduced to be stable. The invention is beneficial to the construction of a heavy metal adsorption-chelation fixed soil environment, greatly reduces therisk of secondary pollution of heavy metals, has the advantages of high purification efficiency, cheap raw materials and simple and concise methods, and is suitable for the remediation and purification of various heavy metal-contaminated soils.

Description

technical field [0001] The invention belongs to the technical field of soil purification, in particular to a method for purifying soil polluted by heavy metals. Background technique [0002] The problem of heavy metal pollution in soil has become an important issue restricting the sustainable development of our country. The discharge of "three wastes" produced by industries such as chemical industry, electroplating, electronics and tanning, mining and smelting of mines, discharge of urban domestic waste, sewage irrigation and sludge agricultural use, etc. , causing a large amount of heavy metal elements such as arsenic, cadmium, chromium, copper, iron, mercury, manganese, nickel, lead, and zinc to dissolve in the soil, and a large amount of nutrient elements such as calcium, magnesium, and phosphorus in the soil to be leached. The main cause of crop growth and crop yield reduction and harm to human health, so it is necessary to deal with heavy metal-contaminated soil. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/00B09C1/105
Inventor 丁中原孙磊
Owner 安徽禾美环保集团有限公司
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