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Soil restoring agent for cadmium pollution paddy field and application

A soil remediation agent and cadmium-contaminated technology, applied in the field of soil remediation agents, can solve the problems of huge projects, expensive remediation, soil damage, etc., and achieve the goal of increasing quantity and activity, improving ecological value and economic value, and reducing fertilizer application Effect

Inactive Publication Date: 2017-07-04
HUNAN SOIL & FERTILIZER INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the implementation process of some of the above methods, there are problems such as huge engineering, expensive restoration, and serious soil damage.

Method used

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  • Soil restoring agent for cadmium pollution paddy field and application
  • Soil restoring agent for cadmium pollution paddy field and application
  • Soil restoring agent for cadmium pollution paddy field and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A soil remediation agent for cadmium-contaminated paddy fields, comprising:

[0033]

[0034]

[0035] The tobacco stalk charcoal is obtained by pyrolyzing waste tobacco stalks at 400° C. for 3 hours with anoxic conditions as raw materials.

[0036] The sepiolite is made by ball milling the raw ore of sepiolite through a 100 mesh sieve, SiO 2 The content is 58%, and the MgO content is 22%;

[0037] The particle size of the diatomite is ≤2mm, SiO 2 Content ≥ 80%;

[0038] The lightly burnt powder has a MgO content ≥ 80%;

[0039] The lime has a CaO content ≥ 80%;

[0040] The zinc fertilizer is zinc sulfate heptahydrate, ZnSO 4 ·7H 2 O content ≥ 95%.

[0041] The microbial agent is Bacillus subtilis, Citrobacter freundii, sulfate-reducing bacteria, Pseudomonas aeruginosa and Candida mixed according to the mass ratio of 1:2:1:2:1; the effective bacteria of each bacteria The concentration is ≥1×10 8 pcs / g.

[0042] The above-mentioned components are weighed...

Embodiment 2

[0044] A soil remediation agent for cadmium-contaminated paddy fields, comprising:

[0045]

[0046] The specification of each component is identical with embodiment 1.

Embodiment 3

[0048] Application of a soil remediation agent for cadmium polluted paddy fields:

[0049] The implementation site is located in Shizi Group, Gucheng Community, Gugang Town, Liuyang City. The soil is river sand and mud, with medium fertility and convenient drainage and irrigation. The soil pH value is 5.24, the total cadmium is 0.478mg / kg, and the available cadmium is 0.321mg / kg.

[0050] A total of 3 experimental groups and 1 control group (without application of soil remediation agent) were set up, with 3 repetitions in each group. The soil remediation agents used in Experimental Group 1 and Experimental Group 3 were prepared according to the scheme shown in Example 1, and the soil remediation agents used in Experimental Group 2 were prepared according to the scheme shown in Example 2.

[0051] Each experimental group was sprinkled on the soil surface at one time before rice transplanting, and then plowed to fully mix the soil repair agent with the contaminated soil, and the...

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Abstract

The invention belongs to the field of soil heavy metal restoration, and concretely discloses a soil restoring agent for cadmium pollution paddy field and application. The soil restoring agent provided by the invention is prepared from the following ingredients in parts by weight: 40 to 70 parts of tobacco stem charcoal, 10 to 20 parts of sepiolite, 10 to 20 parts of kieselguhr, 5 to 10 parts of light burning powder, 5 to 10 parts of lime, 5 to 20 parts of calcium magnesium phosphate fertilizers, 0.5 to 2 parts of zinc fertilizers and 1 to 5 parts of microbial agents. The soil restoring agent is uniformly spread on the soil surface; then, turning is performed so that the soil restoring agent and the polluted soil are sufficiently mixed; the application quantity is 100 to 300kg / mu. The soil restoring agent belongs to the composite restoration; the application is simple; the cost is low; the efficiency is high; the environment is protected.

Description

technical field [0001] The invention relates to the field of soil heavy metal restoration, in particular to a soil restoration agent for cadmium-contaminated paddy fields and its application. Background technique [0002] The heavy metal cadmium is one of the highly toxic environmental pollution elements. According to statistics, the area of ​​cultivated land polluted by cadmium in my country is nearly 1.3 million hm 2 , involving 25 regions in 11 provinces and cities. Cadmium pollution in rice fields not only affects rice yield, quality and the function of the entire farmland ecosystem, but can also be passed through the food chain and endanger human health. [0003] At present, the restoration technologies for cadmium-contaminated farmland include: breeding low-cadmium rice varieties, water and fertilizer management, physical methods (electric restoration, electrothermal restoration, thermal desorption method), chemical methods (solidification and stabilization, soil leac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/00C09K17/40C09K101/00C09K109/00
CPCB09C1/10B09C1/00B09C2101/00C09K17/40C09K2101/00C09K2109/00
Inventor 孙耿罗尊长孙梅刘杰
Owner HUNAN SOIL & FERTILIZER INST
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