Plant repair method for treating soil having combined pollution of arsenic, lead and cadmium

A cadmium-contaminated soil and phytoremediation technology, applied in the restoration of contaminated soil, etc., can solve the problems of small super-accumulative plant biomass, limited practical application, slow growth, etc., and achieve high bioconcentration coefficient, social benefits and economic benefits. Obvious benefits, beautifying the landscape environment

Inactive Publication Date: 2009-02-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, most of the above-mentioned hyperaccumulative plants have small biomass and slow growth, and most of them have better effects on single or two-element compound pollution, which greatly limits their use in remediation of complex polluted soils such as arsenic, lead, and cadmium. practical application of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 (interplanting)

[0020] The pH value of a compound contaminated soil with arsenic, lead and cadmium is 6.7, and the average contents of arsenic, lead and cadmium in the soil are 700mg / kg, 610mg / kg and 320mg / kg respectively. The interplanting of Aster subulateum and Artemisia albicans was transplanted into the soil according to the plant spacing of 20-30 cm and the strip width of 2 m. After 5 months of survival and growth, the shoots of Artemisia albicans were harvested for the first time. After analysis and determination, the contents of arsenic, lead and cadmium in the aerial part were 1410mg / kg, 1210mg / kg and 210mg / kg respectively. When the seeds of Aster subista mature and are about to complete a growth period around November, they are harvested. After analysis and determination, the contents of arsenic, lead and cadmium in the shoots of Aster subtilum are 5410mg / kg, 3210mg / kg and 610mg / kg respectively. The average content of arsenic, lead, and cadmiu...

Embodiment 2

[0021] Embodiment 2 (interplanting)

[0022]The pH value of a soil compound polluted by arsenic, lead and cadmium is 7.6. Its pH was adjusted to 6.8-5.4 by adding citric acid. Aster subtilum was planted in the polluted soil at a plant spacing of 20-40 cm, and 3 m wide strips of Artemisia albicans were planted every 3 m for interplanting. After every 5 months, harvest the aboveground part of Artemisia albicans, in which the stubble of Artemisia albicans is 5-15 cm, and it will germinate and grow again naturally. After every 4 to 5 months, harvest the aboveground part and roots of Aster subtilum, because Aster subtilum is an annual plant, so it is necessary to sow seeds on the original strip after each harvest, and the plot should be rested for 2 days a year. months. After one year, it was determined by analysis that every m 2 The total migration amounts of arsenic, lead and cadmium in Aster subtilis are 2398mg, 1672mg and 574mg respectively, per m 2 The total migration amo...

Embodiment 3

[0023] Embodiment 3 (interval sowing, mixed seeding)

[0024] The average content of arsenic, lead and cadmium in a compound polluted soil with arsenic, lead and cadmium were 6848mg / kg, 8610mg / kg and 2326mg / kg respectively. 60 plants / m on the soil 2 The density of planting Aster subulate, and evenly spray a small amount of 0.003mol / L disodium edetate (EDTA) on the soil every other month after germination. Five months after planting, harvest the entire plant. Then on the soil with 50 plants / m 2 Plant Artemisia albicans at a density of 80-100 cm, harvest the above-ground parts, or harvest the above-ground parts after 6-7 months of growth, and then repeat the above-mentioned sowing of Aster subtilum when it is suitable for sowing. Aster and Artemisia can be mixed and grown on the same plot, and the aboveground parts of the two plants can be harvested every 7 months or so. During this period, regular flooding and draining are used to adjust the oxidation-reduction potential to...

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Abstract

The invention relates to a plant repair method for treating soil polluted by arsenic, lead and cadmium. In the soil combinedly polluted by arsenic, lead and cadmium, the method of single planting, interplanting of another crop, interval seeding or hybride are adopted to directly transplant or sow aster subulatus and ghostplant sagebrush. The treatment and restoration on the soil combined polluted by arsenic, lead and cadmium is completed by the following steps: the hyperaccumulator property of two plants on arsenic, lead and cadmium is used for vastly absorbing arsenic, lead and cadmium enriched in soil; the elements are upward transported and shifted to the over ground part; and the harmful elements such as arsenic, lead and cadmium in the soil are removed by reaping the over ground part.

Description

1. Technical field [0001] The invention relates to a phytoremediation method for controlling soil polluted by arsenic, lead and cadmium, and belongs to the technical field of pollution control. 2. Background technology [0002] The phenomenon of complex soil pollution by non-ferrous metals such as arsenic, lead, and cadmium is relatively common in some parts of my country, especially in some non-ferrous metal mining areas and surrounding areas of smelters. The average content of arsenic, lead, and cadmium in soil far exceeds GB15618-1995 The "Soil Environmental Quality Standards" are the soil critical values ​​(As≤40mg / kg, Pb≤500mg / kg, Cd≤1mg / kg) to ensure agricultural and forestry production and normal plant growth. [0003] At present, the main methods for controlling arsenic, lead, and cadmium-contaminated soil are: agricultural ecological method, engineering technology method and bioremediation method. The agricultural ecological law includes two aspects: one is the agri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 王海娟宁平曾向东张泽彪
Owner KUNMING UNIV OF SCI & TECH
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