Soil remediation method using inedible parts of crop plants for extracting and removing heavy metal

Abstract

The invention provides a soil remediation method using inedible parts of crop plants for extracting and removing heavy metal. According to the soil remediation method, crop varieties with heavy metal extracting performance are selected, soil remediation planting is conducted on farmland in the way of increasing the planting density, the heavy metal is extracted through the inedible parts of the crop plants, and the inedible parts of the crop plants are treated centralized, so that the heavy metal is removed from soil, and meanwhile, edible parts according with the food safety standard are obtained. According to the obtained soil remediation method, the inedible parts of the crop plants are used for absorbing, extracting and removing the heavy metal in the soil, so that the purpose of remediating the heavy metal contaminated soil is achieved, and meanwhile, the edible parts according with the food safety standard are obtained; in-situ remediation of the farmland and agricultural production are completed at the same time, and the soil remediation effect is improved; and environmental friendliness is achieved, secondary pollution is avoided, and the soil remediation method is a soil remediation technique suitable for application and promotion.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a soil remediation method for extracting and removing heavy metals from inedible parts of crop plants. Background technique [0002] With the discharge of industrial and agricultural production and domestic waste, pollution sources such as chemical raw materials, chemical fertilizers, pesticides, heavy metals, radioactive substances and harmful microorganisms enter the soil, gradually exceeding the self-purification capacity of the soil, causing changes in the composition and function of the soil, and inhibiting microbial activities. , the soil ecological balance is destroyed, the soil quality declines, affects the normal development of crops and product quality, and causes soil pollution. According to the types of main pollutants, soil pollution can be divided into: heavy metal pollution, organic pollution, radioactive pollution, pathogenic bacteria pollution, solid was...

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Problems solved by technology

For soil heavy metal pollution, it is very difficult to treat it by physical and chemical means, and it is easy to cause secondary pollution. The bioremediation technology using plant extraction and absorption has low energy consumption and does not produce secondary pollution. It is the most promising remediation technology. However, the existing plant extraction and absorption technology requires the farmland to stop normal production, and the plants that can be used for soil restoration often need to be domesticated and adapted when they are planted in the farmland, and their roots are deep and perennial, which makes it difficult to remove the remaining roots of the repaired plants. Causes changes in the structure of the soil itself, therefore, the current application of plant extraction and absorption technology is greatly limited

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