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Organic-inorganic composite passivator for cadmium contaminated soil and using method of composite passivator

A cadmium-contaminated soil and inorganic composite technology is applied in the field of organic-inorganic composite passivators for cadmium-contaminated soil, and can solve the problems of low remediation efficiency of heavy metal-contaminated soil, prominent secondary pollution and environmental risks, backward stabilization treatment technology and the like , to achieve the effect of low cost, reducing environmental pressure and wide application range

Inactive Publication Date: 2018-01-19
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing heavy metal-contaminated soil stabilization treatment technology is relatively backward, and the stabilization agent is expensive and pollutes the environment, resulting in low efficiency and high cost of heavy metal-contaminated soil stabilization and restoration, secondary pollution and environmental risks.

Method used

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  • Organic-inorganic composite passivator for cadmium contaminated soil and using method of composite passivator
  • Organic-inorganic composite passivator for cadmium contaminated soil and using method of composite passivator
  • Organic-inorganic composite passivator for cadmium contaminated soil and using method of composite passivator

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The preparation method of silkworm excrement biomass charcoal used in the following example is: put the decomposed and air-dried silkworm excrement into a self-made iron container, place it in a high-temperature furnace that can be set with a temperature increase program, bubbling in nitrogen for 15 minutes, and drain it. The air in the furnace is heated up to 500°C by a 20°C / min heating program, and the final temperature is maintained for 3 hours. The high-temperature furnace is turned off, and the container is naturally cooled to room temperature before it is taken out and ground through a 60-mesh sieve for use.

[0031] The silkworm excrement is the second instar silkworm excrement.

[0032] Both the silkworm excrement biomass charcoal and the iron-containing reagent are added to the cadmium-contaminated soil to be repaired in the form of powder or aqueous solution.

Embodiment 1

[0034] The test soil was collected from a polluted farmland around a lead-zinc mine in Guangxi, with a total cadmium content of 52.24mg / kg. After the soil was naturally air-dried to remove stones and gravel, it was thoroughly mixed and ground through an 18-mesh sieve. Weigh 50g of soil over 18 meshes and place it in a 200mL plastic jar, adjust the water content to 40% of the maximum water holding capacity in the field.

[0035] (25±1)℃ Intelligent constant temperature incubator for cultivation. The experiment is set up with 2 treatments, each treatment is set with 3 repetitions, and the water is supplemented by weighing method regularly every other day to maintain a constant moisture content. The processing method is shown in Table 1 below.

[0036] Table 1 Indoor soil culture experiment treatment methods

[0037]

[0038] Destructive sampling was taken at 7d and 56d after culture, and the content of five forms of Cd extracted by Tessier of the soil sample was determined. The trea...

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Abstract

The invention provides an organic-inorganic composite passivator for cadmium contaminated soil and a using method of the composite passivator. The composite passivator is formed by mixing of silkwormexcrement biomass charcoal and an iron-containing reagent, wherein the usage amount of the silkworm excrement biomass charcoal is 1% of the mass of the cadmium contaminated soil to be restored and theusage amount of the iron-containing reagent is 0.2% of the mass of the cadmium contaminated soil to be restored; and when the silkworm excrement biomass charcoal and the iron-containing reagent are used, the silkworm excrement biomass charcoal and the iron-containing reagent are added into the cadmium contaminated soil to be restored, mixing is performed, water is added for maintenance, and the water content of the soil is controlled to be 40%. According to the organic-inorganic composite passivator for the cadmium contaminated soil provided by the invention, the adopted reagent raw materialshave wide sources and low costs, and therefore implementation costs can be reduced; and besides, the using method of the organic-inorganic composite passivator for the cadmium contaminated soil provided by the invention is simple and easy to implement, and the composite passivator is insensitive to soil types, and can be used in most of the cadmium contaminated soil, the applicable range is wide,the restoration efficiency of the cadmium contaminated soil is high, and the restoration effects are obvious.

Description

Technical field [0001] The invention belongs to the technical field of treatment of cadmium pollution in farmland soil, in particular to a cadmium-contaminated soil organic-inorganic composite passivator and a use method thereof. Background technique [0002] There are two main sources of cadmium in soil, namely the parent material of nature and human activities. The former is the background value of cadmium in rocks and soil in nature. Generally speaking, the average value of cadmium in soil in the world is 0.35mg / kg. The background value of soil cadmium in China is 0.097mg / kg, which is much lower than the world average, and generally does not cause harm to the human body. The latter mainly refers to human activities that directly or indirectly discharge cadmium into the environment through industrial and agricultural production activities and are caused The main ways of soil cadmium pollution are summarized as follows: atmospheric cadmium deposition, improper fertilization, sew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08A01B79/00C09K101/00C09K109/00
Inventor 边鹏洋张静静张超兰容群吴海霞黄河李雪徐蒙蒙覃霞刘毓任思为
Owner GUANGXI UNIV
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