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Passivator for repairing compound heavy metal polluted farmland and preparation and application thereof

A technology of heavy metals and passivating agents, applied in the fields of application, chemical instruments and methods, agricultural machinery and implements, etc., can solve the problems of lack of passivating agents, etc., and achieve the effects of low long-term stability, improved soil nutrients, and low overall cost

Inactive Publication Date: 2017-05-17
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: in the prior art, there is a lack of effective passivating agent for repairing complex heavy metal polluted farmland

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The weight ratio of each component in the passivating agent used to repair compound heavy metal polluted farmland in this embodiment is sodium bentonite, nano-iron, calcium magnesium phosphate fertilizer, fly ash, biochar, red mud=20:10:8: 30:20:12.

[0044] In order to illustrate the practical application effect of the present invention, the passivating agent prepared in this example was added to the polluted soil, and plowing was carried out to fully mix the agent with the polluted soil. Every mu of polluted soil adds the passivator of 500Kg present embodiment, and the effective content of heavy metal cadmium, lead, arsenic, chromium in the heavy metal polluted soil is reduced, and disposal effect is shown in the following table:

[0045] Cadmium (Cd) Lead (Pb) Arsenic (As) Chromium (Cr) Before treatment (mg / Kg) 1.51 273 13 450 After treatment (mg / Kg) 0.32 65 2 89 Reduction rate (%) 79 76 85 80

Embodiment 2

[0047] The weight ratio of each component in the passivating agent used to repair compound heavy metal polluted farmland in this embodiment is sodium bentonite, nano-iron, calcium magnesium phosphate fertilizer, fly ash, biochar, red mud=15:15:5: 40:15:10.

[0048] Add the passivator of 600Kg present embodiment per mu of polluted soil, the effective content of heavy metal cadmium, lead, arsenic, chromium in the heavy metal polluted soil is reduced, and disposal effect is as shown in the table below:

[0049] Cadmium (Cd) Lead (Pb) Arsenic (As) Chromium (Cr) Before treatment (mg / Kg) 2.34 334 14 389 After treatment (mg / Kg) 0.42 69 2.8 92 Reduction rate (%) 82 79 80 76

Embodiment 3

[0051] The weight ratio of each component in the passivating agent used to repair compound heavy metal polluted farmland in this embodiment is sodium bentonite, nano-iron, calcium magnesium phosphate fertilizer, fly ash, biochar, red mud=25:8:15: 25:25:15.

[0052] Every mu of polluted soil adds the passivator of 700Kg present embodiment, and the effective content of heavy metal cadmium, lead, arsenic, chromium in the heavy metal polluted soil is reduced, and disposal effect is shown in the following table:

[0053] Cadmium (Cd) Lead (Pb) Arsenic (As) Chromium (Cr) Before treatment (mg / Kg) 3.2 356 10 362 After treatment (mg / Kg) 0.66 82 1.9 88 Reduction rate (%) 79 77 81 76

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Abstract

The invention discloses a passivator for repairing a compound heavy metal polluted farmland. The passivator comprises the following components in parts by weight: 15-25 parts of rock-type mineral particles, 8-15 parts of nano-iron, 5-15 parts of a calcium magnesium phosphate fertilizer, 25-40 parts of coal ash, 15-25 parts of biochar and 10-15 parts of red mud. The passivator for repairing the compound heavy metal polluted farmland disclosed by the invention can effectively reduce the plant effectiveness of heavy metals lead, arsenic, cadmium and chromium in soil, and meanwhile, the soil nutrients are improved and the physical and chemical properties of the soil are maintained.

Description

technical field [0001] The invention relates to a passivating agent for repairing complex heavy metal polluted farmland and a preparation method thereof, which belongs to the category of agricultural technology, and in particular refers to a soil improvement technology method. Background technique [0002] With the rapid development of modern industry and the extensive use of pesticides and chemical fertilizers, sewage irrigation, sludge fertilization and the accumulation of heavy metal waste, heavy metals enter the farmland soil, resulting in the enrichment of heavy metal elements in farmland soil, and heavy metal pollution in farmland soil . Soil heavy metals not only endanger the growth of crops, but also endanger the health of animals and humans through migration and transformation. In order to inhibit the absorption of heavy metal pollutants by planting crops, two methods are mainly studied at present: one is to transform the heavy metals in the soil into insoluble sta...

Claims

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Application Information

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IPC IPC(8): C09K17/40C05G3/04A01B77/00C09K101/00C05G3/80
CPCA01B77/00C05D9/00C05G3/80C09K17/40C09K2101/00C05D9/02C05G1/00
Inventor 吕正勇郭明达魏丽李淑彩朱湖地苗竹范吉强倪鑫鑫冯国杰甄胜利
Owner BEIJING GEOENVIRON ENG & TECH
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