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Passivating agent and application thereof in repairing medium-light mercury polluted farmland soil

A passivating agent and mercury-polluted technology, which is applied in the restoration of polluted soil, application, soil conditioning materials, etc., can solve problems such as difficulty in ensuring the fixation effect, and achieve the effect of lower cost, safety assurance, and simple operation

Pending Publication Date: 2020-05-29
JIANGSU GEOLOGICAL SURVEY INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent involves many in-situ fixation materials, it is better to maintain the pH value of the soil at least 7.0 in advance, and it is difficult to guarantee a targeted fixation effect on different types of soil, sediment or waste and different heavy metals.

Method used

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  • Passivating agent and application thereof in repairing medium-light mercury polluted farmland soil
  • Passivating agent and application thereof in repairing medium-light mercury polluted farmland soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Effect of Passivator Application on Mercury Accumulation in Rice Grain on Moderately and Low Mercury Contaminated Soil

[0018] Definition of medium and low-level pollution: between 1 and 3 times of my country's Secondary Standard for Soil Environmental Quality (GB 15618-1995) (inclusive), it is mildly polluted; between 3 and 5 times (inclusive), It is moderately polluted.

[0019] 1.1 Experimental design

[0020] The field experiment was carried out on farmland soil with medium and low levels of mercury pollution. The soil was collected from the 0-20cm topsoil of an agricultural land in southern Jiangsu. All the raw materials of the modified materials were purchased from commercial products (the zeolite had passed through a 100-mesh sieve). The crops grown are rice.

[0021] The pH of farmland soil is 6.00, which is acidic. The main pollutant of heavy metals is mercury, with an average concentration of 1.80mg / kg. (0.5mg / kg), and 3.6 times the screening va...

Embodiment 2

[0028]Example 2: Effect of Passivator Application on Mercury Accumulation in Wheat Grain on Moderately and Low Mercury Contaminated Soil

[0029] 2.1 Experimental design

[0030] The field experiment was carried out on farmland soil with medium and low levels of mercury pollution. The soil was collected from the 0-20cm topsoil of an agricultural land in southern Jiangsu. All the raw materials of the modified materials were purchased from commercial products (the zeolite had passed through a 100-mesh sieve). The crops grown are wheat.

[0031] The pH of farmland soil is 6.00, which is acidic. The main pollutant of heavy metals is mercury, with an average concentration of 1.80mg / kg. (0.5mg / kg), and 3.6 times the screening value. The test was repeated 4 times, and one or more passivating agents were added to the soil at a mass ratio (W / W) of 0.33%-0.67% of the total application amount, wherein M was treated with zeolite, and D was treated with zeolite. Sodium selenate is proc...

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Abstract

The invention discloses a passivating agent and application thereof in repairing medium-light mercury polluted farmland soil. The passivating agent comprises sodium selenite which is used for reducingthe microbial activity of the mercury polluted farmland soil and is cooperatively applied to an alkaline material with adsorption performance on heavy metals. The passivating agent is prepared from the following components in parts by mass: 90-100 parts of zeolite and 0-10 parts of sodium selenite, and the adding amount of the passivator is 0.33-0.67% of the mass of the surface soil. According tothe passivating and repairing method for farmland soil polluted by medium-light mercury, the pH value of acid soil can be increased, heavy metal mercury in polluted soil can be effectively fixed, thebiological availability of the heavy metal mercury is reduced, absorption and accumulation of heavy metal mercury by crop grains are reduced, the safety of agricultural products is guaranteed, and the passivating agent and application thereof have the advantages of being easy to operate, low in cost and obvious in remediation effect.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of heavy metal pollution of agricultural products, and relates to a passivator and its application in mild mercury-polluted farmland soil during restoration. Background technique [0002] With the rapid development of industrialization and urbanization, my country is facing increasingly severe soil environmental security problems. In some areas, soil heavy metal pollution is serious, and the quality of cultivated land soil environment is worrying. The 2014 National Soil Pollution Survey Bulletin pointed out that human activities such as industrial mining, agriculture, and high background values ​​of the soil environment are the main reasons for soil pollution or exceeding standards. At present, more than 10% of the country's arable land has been polluted by heavy metals, and most of the polluted farmland is moderately or lightly polluted. The quality and safety of agricultural prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02A01B79/00B09C1/08B09C1/00C09K101/00C09K109/00
CPCA01B79/00B09C1/00B09C1/08C09K17/02C09K2101/00C09K2109/00
Inventor 郝秀珍郝社锋李璐葛礼强周东美
Owner JIANGSU GEOLOGICAL SURVEY INST
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