Method for repairing soil polluted by heavy metal in situ by mixed planting of plant

A technology for in-situ remediation and contaminated soil, applied in the fields of botanical equipment and methods, land preparation methods, horticulture, etc., can solve problems such as difficulty in comprehensive promotion, decline in soil fertility, and damage to soil structure, and achieve good remediation effect, low cost, Simple to use effects

Inactive Publication Date: 2012-02-15
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, this method uses a mixed reagent of citric acid, monosodium glutamate waste liquid, and EDTA at a ratio of 10:1:2 to wash the contaminated soil after treatment, which may lead to the leaching of heavy metals and nutrients in the soil;

Method used

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  • Method for repairing soil polluted by heavy metal in situ by mixed planting of plant
  • Method for repairing soil polluted by heavy metal in situ by mixed planting of plant
  • Method for repairing soil polluted by heavy metal in situ by mixed planting of plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The test in this example was carried out on a 2-acre farmland polluted by lead, cadmium and arsenic in Yunnan Province. The heavy metals Pb, Cd and As in this farmland exceeded the third-level standard value of the national soil environmental quality standard (GB15618-1995), and the ranges were 339.11 ~632.43 mg·kg -1 , 2.13~2.56 mg·kg -1 and 212.74~396.65 mg·kg -1 . One-time application of urea and P(KH 2 PO 4 ), K (KCl) are 100, 50 and 75 kg·ha, respectively -1 .

[0017] Both corn and nightshade are directly sown with seeds. After the corn and nightshade grow 3 to 5 leaves, the corn is planted at 7 plants / m 2 and Solanum nigrum according to 5 plants / m 2 Thinning is performed. During the plant growth period, water according to the soil water shortage, and adjust the soil water content to 50% to 80% of the field water capacity. Whole nightshade plants were harvested from the soil after 60 days of plant growth. Continue to press 5 plants / m after harvesting 2 ...

Embodiment 2

[0024] The test in this example was carried out on a vegetable garden near a lead-zinc smelter in Yunnan Province. The heavy metals Pb, Zn, and Cd in the test vegetable garden ranged from 379.63 to 572.50 mg·kg, respectively. -1 , 353.51~850.39 mg·kg -1 and 2.01~4.87 mg·kg -1 . Apply urea, P(KH 2 PO 4 ), K (KCl) are 85, 60 and 75 kg·ha, respectively -1 .

[0025] Both corn and nightshade are directly sown with seeds. After the corn and nightshade grow 3 to 5 leaves, the corn is planted at 4 plants / m 2 and solanum nigrum according to 3 plants / m 2 Thinning is performed. During the plant growth period, water according to the soil water shortage, and adjust the soil water content to 50% to 80% of the field water capacity. Whole nightshade plants were harvested from the soil after 55 days of plant growth. Continue to press 5 plants / m after harvesting 2 Mix nightshade. Harvest 148 days after the growth of corn enters the mature period and the growth of nightshade nigrum e...

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Abstract

The invention discloses a method for repairing soil polluted by heavy metal in situ by the mixed planting of plants, particularly discloses a method for repairing farmlands polluted by the heavy metal in site by mixed planting of nightshade and corn. The method comprises the following steps: planting corn and nightshade on soil polluted by the heavy metal in a mixed mode; harvesting the nightshade after the nightshade grows to the exuberant period; then, planting the nightshade again among corns; and finally harvesting the nightshade and the corn to lower heavy metal in the soil so as to repair the soil polluted by the heavy metal. The content of the heavy metal in the corn kernel produced with the method conforms to the national feed hygienic standard, and therefore the corn kernel is an agricultural product with the economic value. With the method disclosed by the invention, the polluted soil can be repaired and produced at the same time, and therefore the method is a new high-efficient and low-cost repairing path for the soil polluted by the heavy metal.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a method for in-situ remediation of heavy metal-contaminated farmland by using mixed species of black nightshade and corn. Background technique [0002] With the development of the economy and the increase of the population, the soil, as a natural resource for human survival, is becoming more and more overwhelmed. Heavy metal emissions are increasing day by day, and soil heavy metal pollution has become an important environmental problem facing our country. At present, the farmland polluted by heavy metals such as Cd, As, and Pb in my country is as high as 20 million hm 2 , accounting for about 1 / 5 of the total cultivated land area. Every year, 12 million tons of grain are reduced due to heavy metal pollution across the country, causing direct economic losses of more than 20 billion yuan. Heavy metals are highly toxic, difficult to degrade,...

Claims

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Application Information

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IPC IPC(8): A01B79/02A01G1/00
Inventor 熊国焕何艳明栾景丽高建培潘义宏刘维维欧根能陶辉旺陈华君邓竟超杨勇
Owner KUNMING METALLURGY INST
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