Heavy metal passivator and application thereof

A heavy metal passivator, heavy metal technology, applied in the direction of application, chemical instruments and methods, organic fertilizers, etc., can solve the problems of increasing soil load capacity, reducing the effectiveness of heavy metals, reducing the activity of heavy metals, etc., to achieve strong soil environmental friendliness, Good promotion and application value, good passivation effect

Inactive Publication Date: 2021-06-29
CIXI INST OF BIOMEDICAL ENG NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The pH and physical and chemical properties of acidic soil and weakly alkaline soil are different, so there are differences in the passivation mechanism of heavy metals. The passivation materials used to repair acidic soil are mainly to increase soil pH, and reduce the activity of heavy metals by increasing soil pH. , thereby reducing the availability of heavy metals; and some areas in the north are mostly weakly alkaline soils, increasing the pH is difficult to reduce the availability of heavy metals, and it is easy to cause soil compaction and soil fertility reduction problems
At present, most of the patented passivators have a high application rate, which is not conducive to implementation and promotion, and will increase the load capacity of the soil, and there are many types of passivators for cadmium pollution in acidic soils, and passivators for cadmium pollution in weakly alkaline farmland soils Therefore, it is of great practical significance to invent a kind of weakly alkaline farmland soil cadmium passivator that is easy to popularize.

Method used

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  • Heavy metal passivator and application thereof
  • Heavy metal passivator and application thereof
  • Heavy metal passivator and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1 soil passivation effect experiment (passivator 1)

[0064] The test soil was taken from cadmium-contaminated farmland soil in Jiawangtou Village, Xuzhou, Jiangsu Province. After mixing, air-drying, removing impurities and grinding, it passed through a 20-mesh sieve. The soil pH is 7.18, and the available state, Cd content and basic physical and chemical properties in the soil are shown in Table 2.

[0065] Table 2 Some physical and chemical properties of the tested soil

[0066] Soil sample name Soil type pH Cd (mg / kg) DTPA-Cd XZ dark umber 7.18 1.36 0.42

[0067] Note: DTPA-Cd is soil available cadmium extracted with DTPA reagent

[0068] The containers used in the soil culture test are all 250ml plastic beakers, each cup is filled with 100g of soil, when the initial soil is potted, add according to the amount of passivator 1, stir well, the soil maintains a moisture content of 60%, and the plastic cup is covered with plast...

Embodiment 2

[0073] Embodiment 2 Soil passivation effect experiment (passivator 2)

[0074] Same as Example 1, the difference is that passivator 2 is used to passivate the soil.

[0075] result

[0076] After testing, the content of effective Cd decreased from 0.4120mg / kg to 0.3461mg / kg in the soil added with Passivator 2. The fixation rate of 15d effective state Cd is 16.0%.

[0077] Each treatment soil effective state content (mg / kg) under the different culture time of table 4

[0078]

Embodiment 3

[0079] Embodiment 3 soil passivation effect experiment (passivator 3)

[0080] Same as in Example 1, the difference is that the passivator 3 is used to passivate the soil.

[0081] result

[0082] After testing, the content of effective Cd decreased from 0.4120 mg / kg to 0.3473 mg / kg at 15 days after adding passivator 3 to the soil. The fixation rate of 15d effective state Cd is 15.8%.

[0083] Each treatment soil effective state content (mg / kg) under table 5 different cultivation time

[0084]

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Abstract

The invention discloses a heavy metal passivator. The heavy metal passivator comprises hydroxyapatite and a phosphorus-containing material, and further comprises acidic substances and sulfides. The invention also discloses application of the heavy metal passivator in repairing soil polluted by heavy metal cadmium and/or lead. The heavy metal passivator is wide in raw material source and simple in formula, all the components are mixed according to the corresponding proportion, the heavy metal passivator is applied to the heavy metal cadmium contaminated soil during application, use is convenient, new negative effects are avoided, and secondary pollution is avoided; and the heavy metal passivator has high soil environment friendliness and has good application and popularization value.

Description

technical field [0001] The invention relates to a heavy metal passivator and its application in weakly alkaline farmland soil, belonging to the field of remediation of heavy metal polluted soil. Background technique [0002] As the ultimate receptor of water pollution, air pollution and solid waste, soil pollution is very complicated. Soil pollution has the characteristics of hysteresis and concealment. Heavy metals in soil continue to accumulate overload. The exposure of pollution incidents such as "lead" and soil pollution, especially heavy metal pollution in farmland soil, has attracted the attention of various groups. Soil heavy metal pollution remediation technologies mainly include engineering measures, agronomic control measures, chemical passivation remediation technology and phytoremediation technology. Chemical passivation restoration refers to the addition of passivating agents to the soil. By adjusting the physical and chemical properties of the soil, a series o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 吴爱国张越男张玉杰
Owner CIXI INST OF BIOMEDICAL ENG NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
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