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Method for repairing alkaline mercury polluted farmland

A mercury-polluted, farmland technology, applied in the field of alkaline mercury-polluted farmland restoration, can solve problems such as no economic income

Inactive Publication Date: 2020-11-27
中节能大地环境修复有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problem in the prior art that the polluted farmland has no economic income during the restoration period, and provides an optimized method for the restoration of alkaline mercury-contaminated farmland

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In the farmland of a sewage irrigation area in the north, the preliminary investigation results showed that some mercury content in the farmland soil exceeded the standard, the exceeding rate was 15%, the maximum pollution concentration was 3.6mg / kg, and the soil pH value was 7.6~8.4; the experimental repair area was 10000m 2 , length × width is 100 × 100m;

[0038] According to the local crop planting habits, the corn variety Dongdan 60 was selected as the low-accumulation crop, and the high-accumulation plant was selected as the mercury-enrichment plant.

[0039] Planting starts in April of the first year, the row spacing of corn is 38~40cm, the plant spacing is 27~30cm, the row spacing of Euphorbia 28~30cm, the spacing of plants is 28~30cm, and the interplanting mode of corn and Euphorbia is as follows: 2 rows of corn, 3 rows of euphorbia.

[0040] Corn was harvested in October, and the mercury content in corn grains and stalks was tested to be less than 0.1mg / kg, m...

Embodiment 2

[0043] In a farmland in the north, the preliminary survey results showed that some mercury content in the farmland soil exceeded the standard, the exceeding rate was 22%, the maximum pollution concentration was 4.3mg / kg, and the soil pH value was 7.2~8.1; the farmland covers an area of ​​20 mu.

[0044] According to the local crop planting habits, the corn variety Chuandan 418 was selected as the low-accumulation crop, and the high-accumulation plant was selected as the mercury-enrichment plant.

[0045] Planting starts in April of the first year, the row spacing of corn is 38~40cm, the plant spacing is 27~30cm, the row spacing of Euphorbia 28~30cm, the spacing of plants is 28~30cm, and the interplanting mode of corn and Euphorbia is as follows: 2 rows of corn, 3 rows of euphorbia.

[0046] The corn was harvested in October, and the mercury content in corn grains and stalks was tested to be less than 0.1mg / kg, meeting the mercury content requirements in the "Feed Hygienic Stan...

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Abstract

The invention relates to a method for repairing an alkaline mercury polluted farmland. The method comprises the following steps that a polluted farmland is selected, sampling is carried out to obtaina detection value, low-accumulation plants and hyper-accumulation plants for remediation are selected, the polluted farmland is pretreated, the selected low-accumulation plants and hyper-accumulationplants are inter-planted and sowed in lines, and field management is carried out in a plant growth period until the plants can be harvested; after the plants are mature, the plants are disposed, farmland soil is collected, and if the mercury content in the soil is reduced to a target value, restoration succeeds. The method is suitable for low-risk alkaline mercury polluted farmland restoration, wherein pollutants in farmland soil exceed the agricultural land soil pollution risk screening value of Soil Environment Quality Agricultural Land Soil Pollution Risk Management and Control Standard (trial) (GB15618-2018) and are lower than the agricultural land soil pollution risk control value. The problem that there is no economic income in the polluted farmland remediation period is solved by utilizing an inter-planting technology of low-accumulation plants and high-enrichment plants, the repairing effect is good, and the repairing efficiency is high.

Description

technical field [0001] The invention relates to the technical field of restoration of polluted soil, in particular to a method for restoring alkaline mercury-contaminated farmland. Background technique [0002] As the foundation of crop growth, farmland soil is the main source of plant nutrients. Due to the current extensive use of pesticides and chemical fertilizers and long-term irrigation with sewage, farmland soil has been polluted unprecedentedly. [0003] On the whole, among farmland pollution, heavy metal pollution is more serious. The polluted area is as high as 2 million hectares, accounting for 1 / 6 of the country's cultivated land area. The main pollutants are heavy metals, DDT and polycyclic aromatic hydrocarbons. [0004] The crops produced in slightly and lightly polluted farmland may have soil pollution risks such as not meeting the quality and safety standards. At present, such polluted farmland often adopts safe utilization measures such as agronomic regulati...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 吴竞宇燕云仲肖满郭志格王姝
Owner 中节能大地环境修复有限公司
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