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Method for removing heavy metals in soil

A heavy metal and soil technology, applied in the restoration of polluted soil, etc., can solve the problems of plant configuration technology in dump sites of heavy metal mining, reconstruction of single vegetation species, and unstable growth conditions, etc., to improve the landscape of dump sites, The effect of fast growth and improving the ability of water and fertilizer retention

Active Publication Date: 2010-06-09
SHAOGUAN TAOLIN GREEN TECH
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AI Technical Summary

Problems solved by technology

[0004] At present, although the ecological restoration of heavy metal mining dumps by revegetation has become a research and application hotspot in the field of environmental science, from the perspective of the current domestic and foreign research and practical development of ecological restoration technology of dumps, there are still the following problems: ( 1) Although many heavy metal-tolerant plants have been screened out in relevant research, there is no plant configuration technology specifically for the ecological restoration of heavy metal mining dumps; (2) From the perspective of restoration technology and related operating procedures, domestic heavy metal mining The technology related to field ecological restoration is not mature enough, and it cannot comprehensively consider the rational allocation of species with different habits, resulting in the phenomenon of single species of rebuilt vegetation, high maintenance costs, and unstable growth conditions; (3) From the perspective of application effect, due to the lack of scientific Plant configuration technology, the current ecological restoration of heavy metal mining dumps generally has problems such as unstable ecosystems, unsatisfactory landscape effects, and poor restoration effects

Method used

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  • Method for removing heavy metals in soil
  • Method for removing heavy metals in soil
  • Method for removing heavy metals in soil

Examples

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Embodiment 1

[0033] Example 1 Vegetation investigation and screening of Pb / Zn / Cu tolerant plants

[0034] Ecological surveys of vegetation status were carried out in nine copper / lead-zinc mining areas in Guangdong, Anhui, Hubei, Jiangsu and Yunnan, and 217 species of 85 genera and species of higher plants were recorded and analyzed. Taking into account the biomass, dominance, heavy metal content of plants in the settlement and their corresponding soil heavy metal content, 35 species of copper-tolerant plants and 45 species of lead and zinc-tolerant plants were preliminarily screened. Through indoor hydroponics or soil culture tests, 16 Cu-tolerant plants were verified, namely: Radix Heliconia, Commelina officinalis, Venus flytiger, Polygonum cephala, Polygonum sorrel, Polygonum serrata, Artemisia vulgaris, Fusarium spp. , female Lou Cai, Zaipangui, sorrel, pokeweed, ramie, Artemisia annua and foxtail. 15 species of lead and zinc tolerant plants, namely: Dianbaiqian, Pianbaiye, Kui Artemis...

Embodiment 2

[0035] Example 2 Three-dimensional plant configuration mode for indoor potted plants

[0036] In September 2007, the heavy metal contaminated soil was collected from the Dabaoshan abandoned land and transported back to the laboratory, and a potted experiment was used to construct a three-dimensional vegetation restoration model of tree-shrub-grass. The upper vegetation is planted with Cd-tolerant plants star fruit, the middle layer is planted with shrubs such as peach blossoms, ramie, etc., and the lower layer is planted with herbs Zn-tolerant plants Sedum sedum, Cu-tolerant plants Duckweed, polymetal-tolerant grass species Bermudagrass, tall fescue, etc. A total of 16 combinations were designed with different arbor-shrub-grass or arbor-grass configuration patterns. Arbor carambola seedlings were seedlings cultivated in the field, ground peach blossoms and ramie were stem-propagated cuttings, and southeast sedum and duck toe were collected from the mining area. The wild seedli...

Embodiment 3

[0037] Example 3 Dabaoshan Dump Site Vegetation Restoration Configuration Mode

[0038] Seedlings in the field include eucalyptus, paulownia, camphor, masson pine and other saplings; rhizomes are used to raise seedlings in direct nutrient bags; bermudagrass and tall fescue are collected in autumn. The bred seedlings are planted in heavy metal polluted dumps according to the area ratios of trees, shrubs and herbs respectively being 10-20%, 20-30% and 50-70%. The planting spacing of trees is 5m, and the planting spacing of shrubs is 1m. The density of bermudagrass and tall fescue grass seeds is 20kg per hectare of land area. Loosen the field ridge in the middle of the planting belt, spread it, smooth it, and cover it with a layer. straw. Depending on the survival and growth of the seedlings, replant certain seedlings. After one year, a stable vegetation community was basically established on the bare land of the dump, with a coverage of 70-80% ( Figure 4 ).

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Abstract

The invention discloses a method for removing heavy metals in soil. The method is characterized in that: arbors, shrubs and herbal plants are planted in a matching way. The method has the advantages of easy implementation, fast vegetation building, large coverage and good stability, and suitability for large-area recovery. Through the method, a stable and stereoscopic vegetation ecosystem can be built on a heavy metal mining waste disposal site in a short time; and the diffusion and spreading of the heavy metal pollution sources through atmosphere or water body can be effectively controlled.

Description

technical field [0001] The invention relates to the field of heavy metal ecological restoration by utilizing plant growth configuration, in particular to a method for removing heavy metals in soil. Background technique [0002] Heavy metal mining dumps are the main part of mining waste, not only destroying and occupying a lot of land resources, but also bringing a series of far-reaching environmental problems, the most prominent of which is that heavy metals and other pollutants pass through the atmosphere and water bodies. Widespread, resulting in the decline of crop quality, yield and even loss of crops in the surrounding areas, extreme degradation of ecosystems, and pollutants directly affecting human health through the food chain. At the same time, the existence of a large number of mining dumps will also cause varying degrees of damage to the local natural environment landscape. Vegetation restoration, as an important means of controlling the source pollution of mining...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 杨兵杨胜香廖斌束文圣
Owner SHAOGUAN TAOLIN GREEN TECH
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