Method for repairing medium-and-low-concentration mercury polluted farmland soil by using ramie monoculture

A mercury-contaminated, low-concentration technology, applied in the field of soil remediation, can solve problems such as hindering the migration of mercury, difficult migration of mercury, etc., and achieve the effects of being beneficial to absorption, improving enrichment capacity, and promoting plant growth

Active Publication Date: 2019-04-19
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is a strong mechanism that hinders mercury migration between plant roots and

Method used

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  • Method for repairing medium-and-low-concentration mercury polluted farmland soil by using ramie monoculture
  • Method for repairing medium-and-low-concentration mercury polluted farmland soil by using ramie monoculture
  • Method for repairing medium-and-low-concentration mercury polluted farmland soil by using ramie monoculture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Restoration plants: select conventional wild ramie as restoration plants;

[0034] 2. Restoration object: Select an area in Zhejiang with an average total mercury content of 2.12mg·kg -1 , farmland soil with a soil pH of 6.4 is used as the remediation object;

[0035] 3. Preparation of reagents: use indolebutyric acid and naphthaleneacetic acid to prepare a concentration of 20mg L -1 The mixed solution of indole butyric acid and naphthalene acetic acid (referred to as indole butyric acid and naphthalene acetic acid), the configuration concentration is 25mg L -1 gibberellin, 35mg·L -1 gibberellin;

[0036] 4. Test method and result:

[0037] (1) Set up experimental plots on mercury-contaminated farmland, each plot 33m 2 , each treatment was repeated three times, and the planting density of ramie was about 100 pockets per plot, and the ramie was wild ramie collected from the mountainous area of ​​Wenzhou.

[0038] (2) At the beginning of June, before planting ram...

Embodiment 2

[0060] 1. Restoration plants: select conventional wild ramie as restoration plants;

[0061] 2. Restoration object: Select an area in Zhejiang with an average total mercury content of 0.68mg·kg -1 , farmland soil with a soil pH of 6.3 is used as the remediation object;

[0062] 3. Preparation of reagents: use indole butyric acid and naphthalene acetic acid to prepare concentrations of 8, 20, and 85 mg·L -1 The mixture of indolebutyric acid and naphthalene acetic acid is prepared at a concentration of 25 mg L -1 gibberellin, 35mg·L -1 gibberellin;

[0063] 4. Test method and result:

[0064] (1) Set up experimental plots on mercury-contaminated farmland, each plot 33m 2 , each treatment was repeated three times, and the planting density of ramie was about 100 pockets per plot, and the ramie was wild ramie collected from the mountainous area of ​​Wenzhou.

[0065] (2) At the beginning of June, before planting ramie, sprinkle 0.075kg·m -2 The fulvic acid was used to turn o...

Embodiment 3

[0083] 1. Restoration plants: select conventional wild ramie as restoration plants;

[0084] 2. Restoration object: Select an area in Zhejiang with an average total mercury content of 0.68mg·kg -1 , farmland soil with a soil pH of 6.3 is used as the remediation object;

[0085] 3. Preparation of reagents: use indolebutyric acid and naphthaleneacetic acid to prepare a concentration of 20mg L -1 The mixture of indolebutyric acid and naphthalene acetic acid is prepared at a concentration of 25 mg L -1 gibberellin, 35mg·L -1 gibberellin;

[0086] 4. Test method and result:

[0087] (1) Set up experimental plots on mercury-contaminated farmland, each plot 33m 2 , each treatment was repeated three times, and the planting density of ramie was about 100 pockets per plot, and the ramie was wild ramie collected from the mountainous area of ​​Wenzhou.

[0088] (2) At the beginning of June, 0.075kg m -2 The fulvic acid was used to turn over the soil, and the depth of the soil was a...

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Abstract

The invention discloses a method for repairing medium-and-low-concentration mercury polluted farmland soil by using ramie monoculture. The method comprises the following steps: selecting farmland soilwith total mercury content of 0.3-3 mg.kg<-1>, scattering 0.030-0.300 kg.m<-2> of fulvic acid into the farmland soil, and then plowing the farmland soil; planting ramie cuttings into the farmland soil, and irrigating roots of ramie plants with a mixed aqueous solution including indolebutyric acid and naphthaleneacetic acid within 1-4 weeks after the plantation; and harvesting the overground partsof the ramie plants 5-6 months later, and repeating above steps to cultivate the ramie for multiple seasons until the total mercury content in the mercury polluted farmland soil is less than 0.3 mg.kg<-1>. The method of the invention significantly improves the absorption of mercury in the soil by the ramie, and effectively promotes the transfer of mercury in the roots of the ramie to the overground parts, so the repairing efficiency of the mercury polluted farmland soil is greatly increased.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating farmland soil polluted by medium and low concentrations of mercury by using ramie monoculture. Background technique [0002] my country has a large area of ​​cultivated land polluted by heavy metals. According to the results of the "National Soil Pollution Survey Bulletin" published by the Ministry of Environmental Protection in 2014, the rate of mercury pollution points exceeded the standard by 1.6%. Mercury is a non-essential toxic heavy metal element for the human body. After entering the human body, it can damage the human nerves, kidneys and reproductive system. Due to the great harm to human health, mercury is listed as a priority pollutant by the World Health Organization. Mercury in the soil can be enriched in the human body through the food chain, so mercury-contaminated soil is considered to be one of the main sources of global environ...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/08A01B79/02
CPCA01B79/02B09C1/08B09C1/105B09C2101/00
Inventor 徐灿灿刘锐陈吕军
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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