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Method for restoring and using agricultural land contaminated by heavy metal

A heavy metal and farmland technology, applied in the restoration of polluted soil, etc., can solve the problems of unusable land, achieve the effect of maintaining farmland biodiversity, solving land occupation conflicts, and increasing field species types

Inactive Publication Date: 2013-12-04
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003] Technical problem: The purpose of the present invention is to address the problems existing in the prior art, provide a method for remediation and utilization of heavy metal-contaminated farmland, and solve the problem that the land cannot be used in the process of phytoremediation of heavy metal-contaminated dryland soil

Method used

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  • Method for restoring and using agricultural land contaminated by heavy metal
  • Method for restoring and using agricultural land contaminated by heavy metal
  • Method for restoring and using agricultural land contaminated by heavy metal

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Embodiment

[0019] Embodiment: A certain lead-contaminated farmland needs to eliminate lead pollution and restore agricultural production and utilization at the same time. The specific implementation steps are:

[0020] (1) Take profile soil to analyze lead concentration. The analysis results show that the surface concentration is 1500mg / kg, the concentration at 10cm depth is 500mg / kg, the concentration at 15cm depth is 100mg / kg, and the concentration at 30cm depth is 50mg / kg. Therefore, the soil at a depth of 15cm has reached the second-level standard of soil environmental quality. Therefore, the soil layer at a depth of 15cm can be removed for planting crops;

[0021] (2) Vetiver, a lead hyperaccumulator plant, was selected as the restoration plant, its root system depth can reach 150cm, and the main root system is distributed within 45cm;

[0022] (3) Calculate the width ratio of the ridge above the ridge and below the ridge, a / b=(d / h)-1=2, where a is the crop width, b is the planting...

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Abstract

The invention relates to a method for restoring and using an agricultural land contaminated by heavy metal. Through the analysis of the heavy metal content in soil profile, the contamination depth and the type of restoration plants are determined, and the ratio of the width of each ridge upper step face to the width of each ridge lower step face is determined through calculation according to the distribution depths of main root systems of the restoration plants. Ridging construction is completed in a two-side soil turning mode. The improvement of soil fertility is carried out on the ridge lower step faces, then the restoration plants are planted on the ridge upper step faces, and crops are planted on the ridge lower step faces. Agricultural use and plant restoration of contaminated soil are achieved simultaneously, and the method is suitable for restoring and using the heavy metal contaminated land generated by sewage irrigation. Contamination restoring time does not affect land using benefits because the plant restoration and agriculture production are carried out simultaneously, the land cropping index of the method is same as use of a uncontaminated land, the agricultural use is economical and feasible, meanwhile, types of field species are increased, and the method for restoring and using the agricultural land contaminated by the heavy metal has remarkable ecological effects on keeping field biodiversity and exerting a crop growth marginal effect. The method is simple, easy to operate, economical and feasible.

Description

technical field [0001] The invention relates to phytoremediation and agricultural utilization of surface heavy metal-enriched soil caused by sewage irrigation, in particular to a method for remediation and utilization of heavy metal polluted land. Background technique [0002] Compared with other restoration types, phytoremediation of heavy metal-contaminated soil is the cheapest and most thorough restoration method. However, since restoration plants are planted on the land, crops cannot be planted at the same time. Even if crops are planted at the same time, the quality and yield of crops cannot be guaranteed. Therefore, it is difficult to carry out the phytoremediation and utilization of polluted farmland soil at the same time. A large number of studies have shown that phytoremediation is a long process that takes years or even more than a hundred years, and it takes longer to repair complex pollution. Therefore, there is a huge waste of land resources in the process of ph...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 王辉李钢赵华丁忠义渠峻峰
Owner CHINA UNIV OF MINING & TECH
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