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Method for improving heavy metal-polluted soil

A technology of polluted soil and heavy metals, which is applied in the field of improvement of heavy metal-contaminated soil, can solve the problems of poor improvement effect and high cost of improvement, and achieve the effect of improving the improvement effect, improving the ability of water and fertilizer retention, and high plant survival rate

Active Publication Date: 2012-06-06
SHAOGUAN TAOLIN GREEN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for improving heavy metal-contaminated soil with low cost and good improvement effect according to the problems of poor improvement effect and high improvement cost in the existing methods for improving heavy metal-contaminated soil

Method used

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  • Method for improving heavy metal-polluted soil

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1 Indoor potting substrate improvement

[0033] The acidic heavy metal-contaminated soil was collected from the Dabaoshan Copper Mine dump and transported back to the laboratory, where various amendments were added to conduct indoor matrix improvement experiments. Take different combinations, add lime, chemical fertilizer, and bottom mud in the following amounts: lime (25t / ha); chemical fertilizer (150kg / ha); bottom mud (3:7) and fully mix with the collected soil. Plant tall fescue, bermudagrass, and sage, and the planting time is 6 months. Judging from the effect of the pot experiment, the treated seeds without the addition of improvers could not germinate (such as figure 2 : A and B); Add lime and chemical fertilizers to process seeds to germinate normally but the seedlings are weaker, yellow, and show serious symptoms of fertilizer deficiency and heavy metal toxicity (such as figure 2 : C and D); Add lime, the processing plant of bottom mud and chemica...

Embodiment 2

[0034] Example 2 In-situ matrix improvement of Fandong dump on the top of Dabaoshan Mountain

[0035] In March 2007, a wedge-shaped ditch was excavated on the surface of the dump site, with a depth and width of 25cm; on the ditch surface, the excavation specifications were 0.5×0.5×0.5m at intervals of 2m 3 Tree pits with a plant spacing of 2m. Sprinkle a layer of quicklime in the excavated ditches and pits, the addition amount is 10t / ha; then sprinkle a layer of chicken manure, the addition amount is 15t / ha; then sprinkle a thin layer of phosphate fertilizer, the addition amount is 300kg / ha. Backfill the excavated soil, mix well with the improver, and let it balance for a month after several rainfalls. Plant reeds, elephant grass, ramie, and eucalyptus on the soil substrate after soil improvement, and seed-seeding grasses are planted with tall fescue, bermudagrass and other tolerant grasses. In October 2007, stable vegetation was basically established on the bare land of the...

Embodiment 3

[0036] Example 3 In-situ matrix improvement of Dabaoshan copper mine dump

[0037] In November 2007, a wedge-shaped ditch was excavated on the slope of the bare land of the dump site. The size of the ditch was 25cm in depth and width; 3Tree pits with a plant spacing of 2m. Sprinkle a layer of quicklime in the excavated ditches and pits with an addition rate of 20t / ha; then sprinkle a layer of chicken manure with an addition rate of 20t / ha; finally sprinkle a layer of NPK compound fertilizer with an addition rate of 150kg / ha. Backfill the excavated soil, fully mix it with the improver, and balance it for 6 months after several rainfalls. In March 2008, in the pits and ditches after soil improvement, native plants such as reed, ground millet, elephant grass, eucalyptus, masson pine, ground peach blossom and other tolerant plants were planted. In May 2008, the planted plants basically survived, the seeds germinated, and the coverage reached 40-50% ( Figure 5 , Figure 6 ).

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Abstract

The invention discloses a method for improving heavy metal-polluted soil, which comprises the steps of: (1) modifying the heavy metal-polluted soil; (2) adding soil conditioner into soil; and (3) covering the soil, evenly mixing, and balancing for 0-6 months. The method restrains the oxidation of matrix by reactions such as absorption, chelation and complexation, and the like, fixes the heavy metal ion, reduces the biological toxicity of the soil, and reduces the diffusion and the leakage of the heavy metal ion to periphery soil or water. The method has low investment cost, can not break the structure of the soil, and is easily preformed.

Description

technical field [0001] The invention relates to the field of soil improvement methods, in particular to a method for improving heavy metal polluted soil. Background technique [0002] Acidification and heavy metal pollution of mining abandoned land are the two main limiting factors restricting ecological reconstruction and vegetation restoration. Once acidification occurs, the pH will drop to about 2 rapidly, the dissolution of heavy metal ions will be significantly improved, and the toxicity will be enhanced. Acidic surface water and heavy metal pollutants will also spread widely through the atmosphere and water bodies, reducing the quality of crops in surrounding areas, reducing or even losing harvests, and degrading the ecosystem. Pollutants can also eventually affect human health through the food chain. Restoration of extreme environments is not only a hot topic in the field of international ecological environment research, but also a pressing task for my country's curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/40
Inventor 杨胜香杨兵廖斌束文圣
Owner SHAOGUAN TAOLIN GREEN TECH
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