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Phytoremediation technology for heavy metal contaminated soil

A technology that pollutes soil and heavy metals, applied in the fields of agriculture and environmental protection, to achieve good results, low cost, and reduce pollution levels

Inactive Publication Date: 2010-07-28
彭国平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current phytoremediation technology does not meet the conditions in this regard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The test is located in a polluted wasteland on the outskirts of Liuyang City, Hunan Province. The soil lead concentration is 300mg / kg, which belongs to moderate lead pollution, and the soil cadmium concentration is 20mg / kg, which belongs to moderate cadmium pollution. The polluted waste land without grass was used as the control.

[0022] Plant 1.44 Digendou plants per square meter on the polluted land in March every year, sprinkle 2 kg of urea and 0.5 kg of potassium dihydrogen phosphate in each mu of soil, and water to 80% of the field water capacity after the initial planting. In the future, the water content of the soil is controlled to be 30-50% of the field water capacity. The leaves and stems of the grass are collected in September every year. The appearance of the leaves and stems has not changed much, and the national standard method is used to measure and analyze the cadmium and lead content of the soil, leaves and stems.

[0023] The cadmium content of the s...

Embodiment 2

[0025] The test was located in a polluted waste land outside a cadmium chemical factory in Hunan Province. The soil cadmium concentration was 50mg / kg, which belongs to moderate cadmium pollution. The polluted waste land without grass was used as the control.

[0026] Plant 2 Digendou plants per square meter on the polluted land in March every year, sprinkle 6 kg of urea and 2 kg of potassium dihydrogen phosphate in each mu of soil, and water to 80% of the field water capacity after the initial planting. The water content of the control soil is 30-50% of the field water capacity. The leaves and stems of the grass are collected in September every year. The appearance of the leaves and stems has not changed much, and the national standard method is used to measure and analyze the cadmium and lead content of the soil, leaves and stems.

[0027] After one year of remediation, the cadmium content of the soil, leaves and stems of Digi is 34mg / kg, 194mg / kg, and 136mg / kg, respectively...

Embodiment 3

[0029] The test is located in a polluted wasteland in the suburb of Liuyang City, Hunan Province. The soil lead concentration is 200mg / kg, which belongs to moderate lead pollution. The polluted waste land without grass was used as the control.

[0030] Plant 1.5 Digendou plants per square meter on the polluted land in March every year, sprinkle 4kg of urea and 1.2kg of potassium dihydrogen phosphate in each mu of soil, and water to 80% of the field water capacity after the initial planting. In the future, the water content of the soil is controlled to be 30-50% of the field water capacity. The leaves and stems of the grass are collected in September every year. The appearance of the leaves and stems has not changed much, and the national standard method is used to measure and analyze the cadmium and lead content of the soil, leaves and stems. The lead content of the soil, grass leaves and grass stems after one year of remediation are 81mg / kg, 149mg / kg, 54mg / kg respectively.

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Abstract

The invention belongs to the field of agricultural and environmental protection technology, in particular relates to a phytoremediation method for heavy metal (such as cadmium and lead) contaminated soil; the technical proposal includes that: Triarrhena sacchariflora is planted in the soil containing contaminant cadmium and lead, when the triarrhena sacchariflora grows to become mature, the triarrhena sacchariflora is integrally removed from the contaminated soil; the triarrhena sacchariflora is planted in contaminated soil containing heavy metals such as cadmium and lead through open-air common cultivation for regulating soil moisture content and nutrition compositions. Compared with other invention methods, the phytoremediation technology in the invention has the fundamental advantage of directly bringing economic benefits, namely the triarrhena sacchariflora stems can be purchased as paper making source material so that people takes the advantage as the power for reutilizing the soil contaminated by heavy metals such as cadmium and lead. Besides, the invention is simple, feasible, efficient and safe; Mugwort is utilized for phytoremediation to have small disturbance to environment and small destructive power to soil; the accumulated heavy metal can be recovered through advanced technology during incineration power generation for bring a certain economic benefit; the phytoremediation technology has low cost and is applicable to large-area heavy metal contaminated soil.

Description

technical field [0001] The invention belongs to the technical fields of agriculture and environmental protection. Specifically relates to a method for phytoremediation of heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution is an urgent environmental problem facing the world, and traditional remediation methods for polluted soil cannot fundamentally solve the problem. Cleaning the contaminated soil with chemical solvents to wash away the heavy metals is a relatively thorough solution, but the leaching method not only consumes a lot of money and a large amount of engineering, but also has the problem of secondary pollution. Relatively speaking, the plant technology of remediating polluted soil with the help of special functions of plants is becoming a research and development hotspot all over the world because of its safety and low cost. [0003] Phytoremediation can be subdivided into many types such as phytoenrichment, phytostabilization, an...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 彭国平
Owner 彭国平
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