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Passivator used for remediation of heavy metal polluted farmland soil, and preparation and application of same

A technology of soil remediation and passivation agent, applied in the field of soil improvement and environmental protection, can solve the problems of soil secondary pollution, complex preparation process, soil damage, etc., and achieve the effect of increasing crop yield, broad application prospects, and improving soil fertility

Inactive Publication Date: 2018-12-04
中节能大地(杭州)环境修复有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Some modifiers are mainly composed of inorganic components. If they are applied in soil with low organic matter content, compaction may occur;
[0008] (2) Some amendments contain heavy metals, which will cause secondary pollution of the soil;
[0009] (3) The improver has many raw materials, and the preparation process is more complicated, which increases the cost
[0010] Therefore, in view of the complex preparation process, high cost, and soil damage existing in the existing farmland heavy metal pollution remediation technology, a relatively simple and efficient remediation method is proposed, which will have extremely great significance for actual production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A polluted plot near a chemical plant in Fuyang District, Hangzhou City, Zhejiang Province was selected. The test area was 400 square meters, the soil pH value was 6.97, the available cadmium concentration in the soil was 1.2 mg / kg, the available lead was 137 mg / kg, and the available arsenic was 43.1 mg / kg, effective copper 316.4 mg / kg.

[0043] With the mass ratio of 60% straw black charcoal, 20% plant ash and 20% sepiolite powder under the above preparation method, compound as a passivator for repairing heavy metal polluted farmland soil, with a mass ratio of 3% Sprinkle evenly on the surface of the soil, use a rotary tiller to plow the soil at least 2 times, and the plowing depth is 20 cm, so that the above-mentioned passivating agent is fully mixed with the soil, and rice is planted after 3 days of irrigation.

[0044] See Table 1 for the changes in available content and passivation rate of heavy metals in the soil of the block of Example 1 during the test.

[0045...

Embodiment 2

[0047]A polluted plot near a chemical plant in Fuyang District, Hangzhou City, Zhejiang Province was selected. The test area was 400 square meters. The pH value of the soil properties was 6.90. 39.5 mg / kg, effective copper 320.4 mg / kg.

[0048] With the mass ratio of 60% straw black charcoal, 25% plant ash and 15% sepiolite powder under the above preparation method, compound as a passivator for repairing heavy metal polluted farmland soil, with a mass ratio of 3% Sprinkle evenly on the surface of the soil, use a rotary tiller to plow the soil at least 2 times, and the plowing depth is 20 cm, so that the above-mentioned passivating agent is fully mixed with the soil, and rice is planted after 3 days of irrigation.

[0049] See Table 2 for the changes in available state content and passivation rate of heavy metals in the soil of the block of Example 2 during the test.

[0050] heavy metal

Embodiment 3

[0052] A polluted plot near a chemical plant in Fuyang District, Hangzhou City, Zhejiang Province was selected. The test area was 400 square meters. The pH value of the soil properties was 6.93. 46.3 mg / kg, effective copper 315.7 mg / kg.

[0053] With the mass ratio of 60% straw black charcoal, 30% plant ash and 10% sepiolite powder under the above preparation method, compounded as a passivator for repairing heavy metal polluted farmland soil, with a mass ratio of 3% Sprinkle evenly on the surface of the soil, use a rotary tiller to plow the soil at least 2 times, and the plowing depth is 20 cm, so that the above-mentioned passivating agent is fully mixed with the soil, and rice is planted after 3 days of irrigation.

[0054] See Table 3 for the changes in available content and passivation rate of heavy metals in the soil of the block of Example 3 during the test.

[0055] heavy metal

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Abstract

The invention relates to a passivator used for remediation of heavy metal polluted farmland soil, and preparation and application of same. The passivator is composed of, by mass, 60-70% of bio-charcoal, 20-30% of plant ash, and 10-20% of sepiolite powder. The passivator is prepared by preparing straw black charcoal through burning, sieving the plant ash and the sepiolite powder, weighting the straw black charcoal, the plant ash and the sepiolite powder according to mass ratio and mixing the components. The application includes: cleaning to-be-remediated land surface, uniformly spreading the passivator on the soil surface and ploughing the soil over to ensure that the passivator and the heavy metal polluted farmland soil are fully mixed. The passivator is strong in adsorption effect and canchange the forms of the heavy metals in soil. Under cooperation of the components, effective state content of heavy metals is reduced, and fertility of the soil is improved, thereby increasing yieldof crops to certain degree and improving physical and chemical properties of the farmland soil; the passivator is environment-friendly and is free of influence on cultivation and agricultural production due to in-situ remediation, is prepared from accessible and extensive raw materials, and has an extensive application prospect.

Description

technical field [0001] The invention relates to the technical field of soil improvement and environmental protection, in particular to a passivator for remediation of heavy metal-polluted farmland soil that can reduce the content of effective heavy metals in soil, improve soil physical and chemical properties and improve soil fertility, and its preparation and application. Background technique [0002] Soil is the basis of all agricultural activities, and its pollution directly affects the development of agriculture and the quality and safety of agricultural products. With the continuous advancement of industrialization and urbanization, various harmful substances will enter farmland soil through atmospheric deposition, industrial emissions, and pesticide and fertilizer application, seriously affecting the environmental quality of farmland soil. [0003] At present, there are different degrees of soil pollution in the world, and the average annual emission of Hg in the world...

Claims

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Application Information

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IPC IPC(8): C09K17/40C05G3/04B09C1/08C09K101/00C05G3/80
CPCB09C1/08C05D1/00C05G3/80C09K17/40C09K2101/00C05D5/00C05D9/00
Inventor 元妙新钟天翔潘佑祥吴竞宇高辉
Owner 中节能大地(杭州)环境修复有限公司
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