Method for safely utilizing mercury-contaminated soil

A mercury-contaminated soil technology, applied in the field of safe utilization of mercury-contaminated soil and soil, can solve the problems of low repair efficiency, low repair output, high repair cost, etc., to alleviate the shortage of cultivated land resources, improve utilization rate, and reduce migration The effect of the risk

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A mercury-contaminated soil technology, applied in the field of safe utilization of mercury-contaminated soil and soil, can solve the problems of low repair efficiency, low repair output, high repair cost, etc., to alleviate the shortage of cultivated land resources, improve utilization rate, and reduce migration The effect of the risk

CN111438181AInactive Publication Date: 2020-07-24JIANGSU GEOLOGICAL SURVEY INST +1

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[0027] The mercury-contaminated farmland to be utilized in this embodiment is located in Ehu Town, southeast of Wuxi City, Jiangsu Province. The soil pH in this area is 5.89, which belongs to weakly acidic soil; the organic matter content is low, 2.51%; the total mercury content in the soil is 2.55mg· kg -1 , exceeding the "Evaluation Standards for Environmental Quality of Edible Agricultural Products Origin" (HJ / T 332-2006) (0.3mg·kg -1 ), which is 7 times that of mercury heavily polluted soil.

[0028] The specific implementation plan is as follows:

[0029] The first stage:

[0030] The 3 mu test area was divided into 4 test plots on average, each plot was 0.75 mu, and oil sunflower, soybean, peanut and evening primrose were planted in the 4 plots in summer.

[0031] Harvest straw and seeds of oil sunflower, soybean, peanut and evening primrose in each test area, plant rapeseed in winter, and collect rapeseed straw and seeds. Normal field management is carried out in on...

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Abstract

The invention discloses a method for safely utilizing mercury-contaminated soil. According to the method, the mercury-contaminated soil is reasonably and safely utilized and the remediation effect ofthe mercury-contaminated soil can be realized. The method specifically comprises the following steps: in mercury-contaminated farmlands in the Yangtze River basin, a crop rotation mode of planting oilseed rape in winter and planting oenothera biennis, or oil sunflower, or soybean, or peanut and other oil crops in summer is adopted, the mercury content of edible parts of crops is ensured to be in asafe range by utilizing the mercury element enrichment difference of different crops and the accumulation difference of mercury in the edible parts; meanwhile, the accumulation effect of non-edible parts (high biomass) of the selected crops on mercury is utilized, and the effect of removing and repairing mercury in soil is achieved. The method aims to ensure the edible safety of agricultural products while repairing the mercury-contaminated soil, improve the utilization and repair efficiency of the mercury-contaminated soil, relieve the conditions of shortage of cultivated land resources andsevere safety situation of grains and foods in China, and create good economic, social and ecological benefits.

Description

technical field [0001] The invention relates to a soil utilization method, in particular to a method for safely utilizing mercury-contaminated soil, and belongs to the technical field of soil safety utilization. Background technique [0002] The rapid development of modern industrialization has caused a large amount of land to be seriously polluted. Among them, heavy metal pollution in farmland soil has caused a sharp reduction in land for safe agricultural production, and the shortage of cultivated land resources has seriously affected food and food security. [0003] Due to the abundant arable land resources, developed countries often implement crop rotation based on soil fertility cultivation and other needs, and generally adopt fallow and other methods for polluted arable land, and then start agricultural production after it recovers naturally. Compared with developed countries, my country is still in the developing stage, with less cultivated land per capita and scatte...

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Application Information

Patent Timeline

24 Jul 2020

Publication

CN111438181A

IPC: B09C1/10

CPC: B09C1/105; B09C2101/00

Inventors: 陈亚华; 史良