Remediation method for heavy metal pollution of farmland soil

A remediation method and heavy metal technology, applied in the restoration of polluted soil, etc., can solve the problems of high leaching risk of heavy metals, reduce soil use efficiency, etc., and achieve the effect of reducing leaching risk, improving soil microbial activity, and improving solubility.

Active Publication Date: 2019-07-16
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high leaching risk of heavy metals in the restoration methods of the

Method used

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  • Remediation method for heavy metal pollution of farmland soil
  • Remediation method for heavy metal pollution of farmland soil
  • Remediation method for heavy metal pollution of farmland soil

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment provides a method for repairing heavy metal pollution in farmland soil, which specifically includes the following steps,

[0037] In late March, plow and mix the modified vermiculite with the soil. The depth of plowing is 30cm, the dosage of passivator is 100kg / mu, and then curing for 15 days; Management: Harvest wheat in early July, recycle the straw, and plow the farmland; plant the hyperaccumulative plant Solanum nigrum, and apply the activator at the same time, 6kg / mu, and apply the activator once every 15 days with water;

[0038] Harvest nightshade in late August. After plowing the land, plow and mix the heavy metal passivation agent with the soil. The depth of plowing is 30cm, the dosage of passivation agent is 100kg / mu, and then maintain for 15 days; during the autumn and winter stubble period, plant in early September Millet, under normal management, after harvesting in late November, plant the hyperaccumulator plant Solanum nigrum, and apply ac...

Embodiment 2

[0040] This embodiment provides a method for repairing heavy metal pollution in farmland soil, which specifically includes the following steps,

[0041] In mid-March, the modified biochar was plowed and mixed with the soil, the depth of plowing was 30cm, the dosage of passivator was 120kg / mu, and then maintained for 15 days; then, during the spring stubble period, wheat was planted in early April. Management: Harvest wheat in the first ten days of July, recycle the straw, and plow the farmland; plant the super-accumulator vetiver, and apply the activator at the same time, 8kg / mu, and apply the activator once every 15 days with water;

[0042] Harvest vetiver in late August, then plow and mix the heavy metal passivator with the soil, the depth of plowing is 30cm, the dosage of passivator is 120kg / mu, and then maintain for 15 days; during the autumn and winter stubble period, plant in early September Millet, under normal management, after harvesting in late November, plant vetiv...

Embodiment 3

[0044] This embodiment provides a method for repairing heavy metal pollution in farmland soil, which specifically includes the following steps,

[0045] In mid-March, a mixture of modified vermiculite, modified biochar and modified sepiolite with a mass ratio of 3:1:1 was used as a passivator, and mixed with the soil until the soil was plowed to a depth of 10 cm. The amount of chemical agent is 50kg / mu, and then maintain for 15 days; then, during the spring stubble period, plant broad beans in early April, manage them normally, harvest in early July, and then cultivate the farmland; Apply activator, 3kg / mu, apply activator once every 15 days with water;

[0046] Harvest Sedum sedum in late August, then plow and mix the heavy metal passivation agent with the soil, the depth of plowing is 30cm, the dosage of passivation agent is 50kg / mu, and then maintain for 15 days; during the autumn and winter stubble period, plant in early September Sweet potato, under normal management, af...

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Abstract

The invention belongs to the technical field of soil protection, in particular to a remediation method for heavy metal pollution of farmland soil. A heavy metal passivator is uniformly mixed with soil, after conservation, the first crop is planted, and then hyperaccumulators are planted, at that same time, a heavy metal activator is applied and the passivator is applied, after the second crop is planted, the heavy metal passivator is applied at first, so as to reduce the risk of heavy metal leaching, at that same time, heavy metals are avoided to be enriched in crops, and then the heavy metalactivator is applied to plant hyperaccumulators to absorb heavy metals and reduce the content of heavy metals in the soil, and the heavy metals in the soil not covered by the plant roots are kept at alow leaching risk due to the existence of heavy metal passivators. The invention adopts a plant enrichment technology and a method of applying a heavy metal passivator, which can not only fundamentally remove the problem of heavy metals, but also passivate the heavy metals when planting crops, thereby improving the use efficiency of the soil.

Description

technical field [0001] The invention belongs to the technical field of soil protection, and in particular relates to a repair method for farmland soil heavy metal pollution. Background technique [0002] Soil is an important material basis for human survival, but with the deepening of industrialization and urbanization, the discharge of heavy metals continues to increase, resulting in increasingly serious soil pollution. The results of the national soil pollution survey show that the number of points exceeding the standard of inorganic pollutants accounts for 82.8% of the total number of points exceeding the standard, and the main substances causing inorganic pollution are cadmium (7.0%), nickel (4.8%), arsenic (2.7%) , copper (2.1%), mercury (1.6%), lead (1.5%), chromium (1.1%) and zinc (0.9%), the world's average annual emission of lead is 5 million tons, copper is 3.4 million tons, and mercury is 15,000 tons , 15 million tons of manganese, 1 million tons of nickel, and t...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/105B09C1/08B09C2101/00
Inventor 王祺郭丽莉熊静李书鹏何玮淑宋倩王蓓丽阎思诺
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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