Restoration method for northern industrial and mining wasteland heavy metal pollution

A remediation method and wasteland technology, applied in the field of soil pollution remediation, can solve problems such as insufficient stabilizer dosage, difficulty in survival of soil microorganisms and plants, and influence on soil physical and chemical properties, and achieve the effect of promoting rapid and healthy growth and rich matrix nutrients

Inactive Publication Date: 2018-10-02
青岛冠中生态股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the stabilization technology is used alone, adding too much stabilizer will have a great impact on the physical and chemical properties of the soil, which will make it difficult for soil microorgan

Method used

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  • Restoration method for northern industrial and mining wasteland heavy metal pollution
  • Restoration method for northern industrial and mining wasteland heavy metal pollution
  • Restoration method for northern industrial and mining wasteland heavy metal pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A restoration method for heavy metal pollution in northern industrial and mining wasteland, comprising the following steps:

[0028] Clean up the area to be repaired, remove sundries, weeds, garbage, etc., level the raised parts of the ground, ensure that the slope is below 25°, excavate the contaminated soil, the excavation depth is 40cm, and lay a layer on the bottom of the foundation pit HDPE anti-seepage membrane, the excavated soil is uniformly mixed with the stabilizer and backfilled, and a nutrient matrix layer containing seeds is sprayed on the backfilled soil, and the thickness of the nutrient matrix layer is 6cm.

[0029] The stabilizer comprises the following components and their weight distribution ratio with dry soil: 10% of shell powder, 12% of calcium magnesium phosphate fertilizer and 9% of carboxymethyl chitosan. The dry soil is the excavated heavy metal soil dry soil.

[0030] The nutrient matrix layer includes the following components and volume rati...

Embodiment 2

[0032]A restoration method for heavy metal pollution in northern industrial and mining wasteland, comprising the following steps:

[0033] Clean up the area to be repaired, remove sundries, weeds, garbage, etc., level the raised parts of the ground to ensure that the slope is below 25°, excavate the polluted soil, the excavation depth is 35cm, and lay a Layer HDPE anti-seepage film, backfill the excavated soil evenly mixed with stabilizer, spray a layer of nutrient matrix layer containing seeds on the backfilled soil, the thickness of the nutrient matrix layer is 7cm.

[0034] The stabilizer comprises the following components and their weight distribution ratio with dry soil: 2% of shell powder, 3% of calcium magnesium phosphate fertilizer, 1% of carboxymethyl chitosan, and the dry soil is excavated heavy metal soil.

[0035] The nutrient matrix layer includes the following components and volume ratios: 10% clay, 18% perlite, 10% plant fiber, 13.62% montmorillonite, 5% control...

Embodiment 3

[0037] A restoration method for heavy metal pollution in northern industrial and mining wasteland, comprising the following steps:

[0038] Clean up the area to be repaired, remove sundries, weeds, garbage, etc., level the raised parts of the ground, ensure that the slope is below 25°, excavate the polluted soil, the excavation depth is 38cm, and lay a layer on the bottom of the foundation pit HDPE anti-seepage membrane, the excavated soil is evenly mixed with the stabilizer and backfilled, and a nutrient matrix layer containing seeds is sprayed on the backfilled soil, and the thickness of the nutrient matrix layer is 4cm.

[0039] The stabilizer includes the following components and their weight distribution ratio with dry soil: 6% of shell powder, 7% of calcium magnesium phosphate fertilizer, 5% of carboxymethyl chitosan, and the dry soil is excavated heavy metal soil dry soil.

[0040] The nutrient matrix layer includes the following components and volume ratios: 24% clay, ...

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Abstract

The invention provides a restoration method for northern industrial and mining wasteland heavy metal pollution, and relates to the technical field of soil restoration. The restoration method is characterized in that impurities, weeds, garbage and the like in a to-restored area are removed, flattening treatment is performed for enabling gradient to be smaller than 25 degrees, polluted soil is excavated with excavation depth being 40-60 cm; a layer of HDPE impermeable membrane spreads on the bottom of a foundation pit; a stabilizer is added into temporarily stored polluted soil to mix; the mixedoil is backfilled onto the impermeable membrane; a layer of nutrient substrate with a thickness being 4-7 cm is sprayed and distributed on the upper layer of the backfilled soil; the stabilizer is prepared from 2-10% of shell powder, 3-12% of a calcium magnesium phosphate fertilizer, and 1-9% of carboxymethyl chitosan; and the nutrient substrate layer consists of the following components in volume ratio: 10-24% of clay, 10-18% of perlite, 9-24% of plant fibers, 8-15% of montmorillonite, 1-5% of a controlled-release compound fertilizer, 20-40% of organic matters, 0.35-0.38% of an aggregate agent, and 0.5-3% of seeds; and the seeds are one or more of nitraria tangutorum bobr, haloxylon ammodendron, hedysarum scoparium, caragana korshinskii, medicago sativa and lespedeza. The restoration method adopts a curing-plant enriching combined restoration technology, and has the beneficial effect of fixing heavy metals in the soil.

Description

technical field [0001] The invention provides a restoration method for heavy metal pollution in industrial and mining abandoned land in northern China. The target heavy metal pollutants are lead, zinc and cadmium, and relates to the technical field of soil pollution restoration. Background technique [0002] With the continuous development of the global economy, heavy metal pollution in soil has become a major problem facing the global environmental quality. Heavy metals in soil come from a wide range of sources, mainly from various wastes discharged from human production activities, such as mining, smelting and waste electronic products. Treatment, etc., as well as agricultural chemical fertilizers (unreasonable use) and pesticides, radioactive substances, etc. Heavy metal pollution is concealed, long-term, and irreversible. It cannot be decomposed by plants or microorganisms, eventually leading to soil degradation and crop yield reduction. It enters the human body through ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08B09C1/105B09C2101/00
Inventor 李春林许剑平陈舒臧小龙曹志泉祁传磊
Owner 青岛冠中生态股份有限公司
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