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Ecological remediation method for soil contaminated by multiple sorts of heavy metal and application thereof

A technology for polluted soil and ecological restoration, applied in the restoration of polluted soil and other directions, can solve the problems of high cost, incomplete treatment and removal, secondary pollution, etc., and achieves a simple method and eliminates heavy metal pollution in soil and its damage to the environment. and harm to human beings, the effect of reducing input

Inactive Publication Date: 2017-12-22
吴洪生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] These methods have their own advantages and disadvantages, and most of them are used for water pollution control, but not many are used for large-scale soil pollution control, because the cost is too high, there is secondary pollution, and the treatment and removal are not thorough

Method used

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  • Ecological remediation method for soil contaminated by multiple sorts of heavy metal and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Dig out the heavy metal contaminated soil, stack it on the cement floor or plastic / ceramic container, use 0.2mol / L NaOH and / or 0.2mol / L HCl to adjust the pH of the contaminated soil to 5 first, and surround the whole pile with a strong plastic tent outside Soil, so that the entire heavy metal pollution treatment process is carried out in a closed space; add 0.1% K to 1000 kg of heavy metal contaminated soil by mass / mass ratio 2 SO 3 , 0.1-5% K 2 S 2 o 3 , 1% polycalcium sulfide, turn the soil several times, or stir the soil, mix well, and set aside;

[0030] 2. Add 30 kg of clean water to 100 kg of plant straw powder with a particle size of 80 mesh, mix well, add 1000 U / kg cellulase according to the enzyme activity unit U / mass ratio, mix well, turn or stir once a day, and let stand Cultivate for 5 days and reserve;

[0031] 3. Add 40 kg of clean water to 100 kg of starch powder with a particle size of 100 mesh, mix well, add 1000 U / kg of amylase according to the...

Embodiment 2

[0034] 1. Dig out the heavy metal contaminated soil, stack it on the cement floor or plastic / ceramic container, use 1mol / L NaOH and / or 1mol / L HCl to adjust the pH of the contaminated soil to 6 first, and put it in a closed large-capacity mixer truck or mixing tank carry out, so that the whole heavy metal pollution treatment process is carried out in a closed space; add 1% K to 1000 kg of heavy metal polluted soil according to the mass / mass ratio 2 SO 3 , 1%K 2 S 2 o 3 , 10% polycalcium sulfide, turn the soil several times, or stir the soil, mix well, and set aside;

[0035] 2. Add 50 kg of clean water to 100 kg of plant straw powder with a particle size of 100 mesh, mix well, add 800 U / kg of cellulase according to the enzyme activity unit U / mass ratio, mix well, turn or stir once a day, and let stand Cultivate for 6 days and reserve;

[0036] 3. Add 60 kg of clean water to 100 kg of starch powder with a particle size of 200 mesh, mix well, add 800 U / kg of amylase accordin...

Embodiment 3

[0039] 1. Dig out the heavy metal contaminated soil, stack it on the cement floor or plastic / ceramic container, use 4mol / L NaOH and / or 4mol / L HCl to adjust the pH of the contaminated soil to 7 first, and put it in a closed large-capacity mixer truck or mixing tank carry out, so that the whole heavy metal pollution treatment process is carried out in a closed space; add 5% K to 1000 kg of heavy metal contaminated soil according to the mass / mass ratio 2 SO 3 , 5%K 2 S 2 o 3 , 30% polycalcium sulfide, turn the soil several times, or stir the soil, mix well, and set aside;

[0040] 2. Add 60 kg of clean water to 100 kg of plant straw powder with a particle size of 300 mesh, mix well, add 500 U / kg of cellulase according to the enzyme activity unit U / mass ratio, mix well, turn or stir once a day, and let stand Cultivate for 7 days and reserve;

[0041] 3. Add 80 kg of clean water to 100 kg of starch powder with a particle size of 300 mesh, mix well, add 500 U / kg of amylase acco...

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Abstract

The invention discloses an ecological remediation method for soil contaminated by multiple sorts of heavy metal and an application thereof, and belongs to the field of environmental protection. The method is implemented through the following steps that according to the mass percentage, 0.1%-3% of sulfur powder, 0.1% of potassium sulfite, 0.1%-5% of potassium thiosulfate, 2%-30% of straw, 1%-30% of calcium polysulfides and the like are added into the soil contaminated by the multiple sorts of the heavy metal at the same time; the pH is adjusted to be 5-7, the soil water content is kept to reach 60%-100%, and the soil is evenly stirred thoroughly; the periphery of the soil is covered with a plastic film to be sealed, or the soil is contained in a ceramic or plastic container to be covered; and overturning and stirring are conducted once about every week; and after stirring lasts for 3-5 times, the multiple sorts of the heavy metal like Pb, Cd, Cr, Cu, Ni, Mn, Hg, Ag, Fe and Zn in the contaminated soil can be mostly solidified and deposited (the solidification rate reaches 99% or above). Therefore, leaching of the heavy metal is reduced, the biological activity and solubility of the heavy metal are also reduced, heavy metal pollution of the soil is eliminated, and the environment can be protected.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to an ecological restoration method and application of various heavy metal polluted soils. Background technique [0002] Heavy metals refer to metals with a relative density of 5 or more, about 45 kinds, including copper (Cu), lead (Pb), zinc (Zn), tin (Sn), nickel (Ni), cobalt (Co), antimony (Sb) , Mercury (Hg), Cadmium (Cd) and Bismuth (Bi), etc. Although arsenic (As) is not a heavy metal, it is usually included in the category of heavy metals for research and discussion because its source and hazards are similar to those of heavy metals. [0003] With the increasing mining, smelting, processing and commercial manufacturing activities of heavy metals, the use of heavy metals is becoming more and more widespread, and the pollution of heavy metals is becoming more and more serious. Heavy metals are listed as the first pollutants in all countries in the world. It...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 吴洪生
Owner 吴洪生
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