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Preparation method of organic/inorganic composite passivator for reducing activity of heavy metal Cd in farmland soil

An inorganic composite and passivating agent technology, which is applied in the restoration of polluted soil, chemical instruments and methods, organic fertilizers, etc., can solve the problems of large soil disturbance, unsatisfactory restoration efficiency, and slow growth, and achieves simple preparation methods, Improve the passivation efficiency and promote the effect of adsorption

Inactive Publication Date: 2014-06-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical method: soil replacement, topsoil removal, air extraction, heat treatment, etc., quick results, but difficult to implement, high cost, large disturbance to the soil, seriously reducing soil fertility
Biotechnology method: use planting, animals, and microbial enrichment organisms to absorb and remove heavy metals in the soil, but the treatment cycle is long, and it can only be used as a long-term restoration strategy. Moreover, the biological species currently used to repair heavy metals are limited, and most of them have low biomass. , slow growth, poor adaptability, repair efficiency is difficult to meet the needs of practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Determination and analysis of background value of heavy metals in the soil of organic loquat planting bases

[0029] For the organic loquat base, 20 samples were taken from each sampling point according to the plum blossom point method, mixed and dried, then ground, and passed through a 100-mesh sieve for determination. The results of soil heavy metal content determination are shown in Table 1.

[0030] Table 1 The content of each heavy metal in the sample (mg / kg)

[0031] sample number Pb Cd Cu Cr 1 94 5.1 44.4 90.4 2 124 4.2 40.8 78.7 3 55 3.9 41.8 85.7 4 139 3.1 42.9 84.7 average value 103 4.08 42.48 84.88

[0032] It can be seen from the results in Table 1 that the contents of heavy metal elements Pb, Cu and Cr in the soil all meet the level II standard of GB15618-1995 soil environmental quality (Pb ≤ 80 mg / kg, Cd ≤ 0.3 mg / kg, Cu ≤ 50 mg / kg, Cr ≤ 250 mg / kg), and the content of Cd seriously exceeded ...

Embodiment 2

[0039]1. Determination and analysis of background value of heavy metals in the soil of organic grape planting bases

[0040] In the organic grape planting base, 20 samples were taken from each sampling point according to the plum blossom point method, mixed and dried, then ground, and passed through a 100-mesh sieve for determination. The results of soil heavy metal content determination are shown in Table 2

[0041] Table 2 The content of each heavy metal in the sample (mg / kg)

[0042] sample number Pb Cd Cu Cr 1 54 0.874 46.2 84.9 2 48 0.701 37.9 79.6 3 74 0.897 40.7 59.9 4 62 0.629 45.2 73.5 average value 60 0.78 42.50 74.48

[0043] It can be seen from the results in Table 2 that the contents of heavy metal elements Pb, Cu and Cr in the soil all meet the level II standard of GB15618-1995 soil environmental quality (Pb ≤ 80 mg / kg, Cd ≤ 0.3 mg / kg, Cu ≤ 50 mg / kg, Cr ≤ 250 mg / kg), and the content of Cd exceeds th...

Embodiment 3

[0050] 1. Determination and analysis of background value of heavy metals in soil of organic vegetable planting base

[0051] For the organic vegetable planting base, 20 point samples were taken from each sampling point according to the plum blossom point method, mixed and dried, then ground, and passed through a 100-mesh sieve for determination. The results of soil heavy metal content determination are shown in Table 2

[0052] Table 3 The content of each heavy metal in the sample (mg / kg)

[0053] sample number Pb Cd Cu Cr 1 46 0.914 41.4 81.6 2 52 0.816 39.5 75.0 3 47 0.851 44.9 53.8 4 39 0.791 43.0 68.4 average value 46 0.84 42.20 69.70

[0054] It can be seen from the results in Table 3 that the contents of heavy metal elements Pb, Cu and Cr in the soil all meet the level II standard of GB15618-1995 soil environmental quality (Pb ≤ 80 mg / kg, Cd ≤ 0.3 mg / kg, Cu ≤ 50 mg / kg, Cr ≤ 250 mg / kg), and the content of Cd...

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Abstract

The invention discloses an organic / inorganic composite passivator for passivating the activity of heavy metal Cd in farmland soil. The organic / inorganic composite passivator is prepared from 35% of crushed rape stalk, 35% of humus soil, 25% of bentonite and 5% phosphate (monopotassium phosphate) in a manner of fully mixing evenly at a ratio (the application ratio is the optimal application ratio obtained from an experiment). 200-400kg of composite passivator is fertilized to each mu of heavy metal Cd-polluted soil (concrete application amount is determined according to the heavy metal-polluted degree and the actual condition of the site); the content of effective-state Cd in the heavy metal-polluted soil is reduced by 38.07-53.18% in comparison with a control group by the passivation effect; the passivation effect on the heavy metal Cd is significant. The method has the advantages that the raw materials are free of poison and pollution, and easy to obtain, do not generate a significant effect on the physical and chemical properties of the soil after application, and do not generate secondary pollution, meanwhile, the fertility of the soil is significantly improved, and the yield of the crop is improved. The organic passivator is compounded with the inorganic passivator, so that the adsorption effects on the heavy metal caused by the passivators are facilitated by the chelation, and the passivation efficiency of the heavy metal is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of agricultural environmental protection and restoration, and specifically relates to a preparation method of a heavy metal Cd pollution passivator for repairing agricultural land soil. It is mainly applicable to the remediation of agricultural land soil contaminated by heavy metal Cd. Background technique [0002] Over the past few decades, heavy metal pollution of land has become a growing problem due to the influence of human activities (including mining, industrial activities, improper use of heavy metal-concentrated fertilizers and pesticides, irrigation of heavy metal-contaminated wastewater, etc.). Because heavy metals cannot be decomposed by soil microorganisms, they are easy to accumulate in the soil, and even transformed into more toxic methyl compounds through the action of microorganisms in the soil, enter animals and human bodies through the food chain, and accumulate in organisms, seriously aff...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
Inventor 徐恒裴东辉宋海海
Owner SICHUAN UNIV
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