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Composite passivator for remediating combined heavy metal contaminated farmland soil and using method thereof

A technology for compound pollution and soil pollution, which is applied in the field of soil treatment to achieve the effect of increasing added value, simple operation, and good popularization and application value.

Inactive Publication Date: 2018-05-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a method that can significantly reduce the effective state content of Cd, Cu, Zn and As in the soil at the same time, and aim at the deficiency of Cd, Cu, Zn and As multiple heavy metal compound polluted farmland restoration technology. Composite passivator capable of improving soil pH and organic matter and remediating heavy metal compound polluted farmland soil and its application method

Method used

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  • Composite passivator for remediating combined heavy metal contaminated farmland soil and using method thereof
  • Composite passivator for remediating combined heavy metal contaminated farmland soil and using method thereof
  • Composite passivator for remediating combined heavy metal contaminated farmland soil and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of composite passivator:

[0038] A, drying the decomposed silkworm excrement to a constant weight, and pulverizing through a ball mill through a 100-mesh sieve for subsequent use;

[0039] B. Pass the iron powder through an 80-mesh sieve to ensure that its particle size is ≤80 mesh.

[0040] (2) Mixing with soil: Treat without adding passivating agent material as blank control, add the passivating agent that is 3% of soil mass in the total addition amount in the polluted soil, wherein passivating agent is composed of 33.3% silkworm excrement and 66.7% iron powder, both are added at the same time, the passivator is fully mixed with the soil, and after stirring evenly, a certain amount of water is added to keep the soil moisture up to 60% of the maximum water holding capacity in the field.

[0041] (3) Reaction: After 20 days, the DTPA extraction method was used to measure the soil available Cd, Zn, Cu, the hydrochloric acid extraction method was used to...

Embodiment 2-4

[0043] The difference from Example 1 is that the proportions of silkworm excrement and iron powder in the passivating agent are different and the total amount of passivating agent added is different, see Table 1 for details; the preparation method and measurement method adopted are the same as in Example 1.

[0044] Table 1: The amount of passivating agent added in each embodiment and the raw material composition of passivating agent

[0045]

[0046] It can be seen from the accompanying drawings:

[0047] figure 1 It reflects the influence of passivation treatment on soil available Cd in different examples. Compared with the control group, the available Cd in the soil of the four examples decreased by 35.52%, 30.32%, 42.52%, and 37.39%.

[0048] figure 2 It reflects the influence of passivation treatment on soil available As in different examples. Compared with the control group, the available As in the soil of the four examples decreased by 57.23%, 60.79%, 74.97%, an...

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Abstract

The invention discloses a composite passivator for remediating combined heavy metal contaminated farmland soil and a using method thereof. The composite passivator is mainly prepared from, by weight,20%-33.3% of silkworm excrement and 66.7%-80% reduced iron power. When the composite passivator is in use, the decomposed silkworm excrement and the reduced iron power are added to the contaminated soil at the same time and are evenly mixed with the soil. By using the composite passivator, the content of effective state cadmium, arsenic, zinc and copper in the soil can be remarkably reduced, the pH value and organic matters of the soil can be increased at the same time, and the physical and chemical properties of the soil can be improved. The composite passivator for remediating the combined heavy metal contaminated farmland soil and the using method thereof are suitable for heavy metal composite contaminated farmland remediation, low in cost, easy to operate and practical and have good application and popularization value.

Description

technical field [0001] The invention relates to the technical field of soil treatment, in particular to a heavy metal compound passivator for repairing farmland soil polluted by multiple heavy metals and a method for using the same. Background technique [0002] In recent years, with the rapid development of my country's economy, the in-depth advancement of industrialization, urbanization and agricultural modernization, the problem of soil heavy metal pollution has become increasingly prominent. According to the National Soil Pollution Survey Bulletin jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall national soil environment situation is not optimistic, and the quality of cultivated land soil environment is worrying. The main heavy metal pollutants are cadmium, lead, copper, zinc and arsenic. [0003] Soil is an important part of the environment, the natural environment on which human beings depend and an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C05G3/04C09K101/00C09K109/00C05G3/80
CPCB09C1/08C05D9/02C05G3/80C09K17/40C09K2101/00C09K2109/00C05F3/00
Inventor 张超兰涂春艳蒋林伶容群张涛徐蒙蒙
Owner GUANGXI UNIV
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