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Method for passivation treatment of farmland heavy metal pollution and reconstruction of soil nutrient health

A technology of polluted soil and soil nutrients, applied in the field of pollution remediation, can solve the problems of not considering the content of other elements in the soil, achieve good application prospects, improve soil physical and chemical properties, and comprehensively supplement nutrients

Inactive Publication Date: 2021-09-07
中环循环境技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it only focuses on trace elements such as zinc and manganese that are affected by wollastonite passivation, and does not consider the content levels of other elements in the soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example is a farmland polluted by heavy metals in Hubei. The main pollutants are heavy metals cadmium and arsenic, of which the cadmium content is 1.18 mg / kg and the arsenic content is 38.04 mg / kg. In addition, the soil lacks organic matter, nitrogen, phosphorus, potassium, and elements such as boron, molybdenum, copper, and zinc.

[0037] The composition and weight ratio of each component in the heavy metal polluted farmland soil conditioner of the present embodiment are shown in Table 2.

[0038] Table 2 Composition of Conditioning Agent for Restoration of Heavy Metal Pollution in Farmland Soil in This Example

[0039] Element type Proportion Zeolite natural zeolite 15 bio-charcoal straw biochar 15 Iron-bearing mineral particles Ferrihydrite, Magnetite 10 Organic Fertilizer It is fermented from crop straw and livestock manure 40 Inorganic fertilizer Urea, potassium dihydrogen phosphate 12 Trace Element Sup...

Embodiment 2

[0042] This example is a farmland polluted by heavy metals in Chongqing. The main pollutants are heavy metals cadmium, arsenic and lead, wherein the content of cadmium is 0.88 mg / kg, the content of arsenic is 41.70 mg / kg, and the content of lead is 93.61 mg / kg. In addition, the soil lacks organic matter, potassium, calcium, sodium, magnesium, and elements such as boron, molybdenum, cobalt, and zinc.

[0043] The composition and weight ratio of each component in the heavy metal polluted farmland soil conditioner of the present embodiment are shown in Table 3.

[0044] Table 3 Composition of Conditioning Agent for Restoration of Heavy Metal Pollution in Farmland Soil in This Example

[0045] Element type Proportion Zeolite natural zeolite 12 bio-charcoal straw biochar 12 Iron-bearing mineral particles ferrihydrite, goethite 5 Organic Fertilizer It is fermented from crop straw and livestock manure 50 Inorganic fertilizer Urea, c...

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Abstract

The invention discloses a method for passivation treatment of farmland heavy metal pollution and reconstruction of soil nutrient health. The method comprises the following steps: firstly, detecting types and content of heavy metals in farmland soil and content levels of 17 necessary elements; preparing a soil conditioner; applying a soil conditioner; and carrying out soil conservation to restore the ecological function of the soil. The soil conditioner for the farmland heavy metal pollution comprises the following components in parts by weight: 10-20 parts of zeolite, 10-20 parts of charcoal, 5-15 parts of iron-containing mineral particles, 40-50 parts of an organic fertilizer, 10-20 parts of an inorganic fertilizer, 1-5 parts of a trace element supplement and 1-5 parts of a microbial agent. According to the invention, harmful heavy metal elements are passivated, the effectiveness of the heavy metals in the soil is effectively reduced, essential elements in the soil are comprehensively supplemented, and beneficial elements are added to reconstruct nutrient balance of the soil.

Description

Technical field: [0001] The invention belongs to farmland soil heavy metal, a method for passivating farmland heavy metal pollution and rebuilding soil nutrient health. It belongs to the field of pollution remediation. Background technique [0002] Heavy metal pollution in my country's farmland soil is very serious. The polluted area accounts for about 1 / 5 of the country's cultivated land area, and it is intensifying. At the same time, due to soil degradation and loss, the nutrients in the soil are continuously reduced, and the health of the soil itself level is also seriously threatened. Studies have shown that heavy metals and crop nutrients often use the same transport system for absorption or storage due to the similarity in chemical properties or the correlation of metabolic pathways, resulting in heavy metal stress that interferes with the utilization of crop nutrients, accumulates in crops, and affects agricultural products. Safety and human health; but at the same t...

Claims

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Application Information

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IPC IPC(8): A01B79/02C05G3/80
CPCA01B79/02C05G3/80C05B7/00C05C3/00C05C9/00C05D1/02C05D9/00C05D9/02C05F3/00C05F11/00C05F11/08C05B13/02C05D3/00
Inventor 李东明龚宇阳王静
Owner 中环循环境技术有限责任公司
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