Soil passivating agent suitable for northern sewage irrigation area farmland and application method of soil passivating agent

An application method and passivating agent technology, which is applied in the field of preparation and application of restoration materials, can solve the problems of high cost, and achieve the effects of high porosity, removal of heavy metal pollution, and large specific surface area

Inactive Publication Date: 2017-11-17
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN101992207 proposes a heavy metal-polycyclic aromatic hydrocarbon compound polluted soil strengthening repair agent, which is composed of gly

Method used

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  • Soil passivating agent suitable for northern sewage irrigation area farmland and application method of soil passivating agent
  • Soil passivating agent suitable for northern sewage irrigation area farmland and application method of soil passivating agent
  • Soil passivating agent suitable for northern sewage irrigation area farmland and application method of soil passivating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The passivation effect of three passivation materials (sepiolite, biochar and humic acid) on the heavy metal cadmium and mercury in the soil was studied through pot experiments, and the passivation was finally screened by considering the effect on soil improvement and the impact on plant growth. The optimal dosage and proportion of the agent. The experimental crop is corn, and the seeds are purchased from Liujian Village, Xiaodian District. The variety is Ningyu 524, which is a relatively common variety planted locally. The sepiolite, humic acid and biochar used in the test were purchased from Pengzhan Mineral Products Trading Co., Ltd., Lingshou County, Hebei Province, Luliang Shengda Biological Development Co., Ltd., and Shandong Fengben Biotechnology Co., Ltd., respectively.

[0032] The soil used in the research is mildly polluted soil, which was taken from the Xiaodian sewage irrigation area in Taiyuan City, Shanxi Province in 2016. The basic physical and chemical ...

Embodiment 2

[0057] Embodiment 2 Environmental friendliness and ecological security evaluation

[0058] Whether the restoration materials will bring new environmental pollution during use and whether they will affect the soil ecological function is an important factor affecting whether the restoration materials can be applied and promoted. In order to explore whether the passivation materials required for the test will affect the soil environment Secondary pollution and plant toxicity, by adding medium dose (0.3% of each passivation material application) and high dose (0.5% of each passivation material application) passivator, the analysis of each The content of heavy metal-like pollutants was tested, and the environmental friendliness and ecological safety of the passivators used were evaluated through the wheat root elongation inhibition test (method referred to ISO11269-1, 2012).

[0059] Table 6 Effects of different remediation agents on soil heavy metal content

[0060]

[0061] I...

Embodiment 3

[0063] Embodiment 3 field test

[0064] According to the results of the pot test, taking the effective content of heavy metals Cd and Hg in the soil as the main evaluation index, it can be concluded that the combination with the best passivation effect is A:5g / kg+B:1g / kg+C:2g / kg, The effective state of heavy metals can be reduced by about 60%. In addition, the formula can reduce soil pH and increase organic matter content, which is helpful to alleviate soil salinization and improve soil fertility, and is environmentally friendly and ecologically safe. Based on the results of the pot test, the formula has a high targeted feasibility for soil pollution remediation in sewage irrigation areas where corn is planted.

[0065] For farmland soil remediation, because agricultural production is greatly affected by natural conditions, many factors are difficult to control in the field, so the pot test is one of the important methods to cooperate with the field test. This method can pro...

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Abstract

The invention provides a soil passivating agent suitable for northern sewage irrigation area farmland and further provides an application method of the soil passivating agent, wherein the application method mainly aims at northern sewage irrigation area heavy metal contaminated soil. The soil passivating agent comprises, by mass, 1-6 parts of clay minerals, 1-5 parts of biological carbon and 1-3 parts of humic acid. The clay minerals comprise one or more of sepiolite, zeolite, serpentine, talcum, attapulgite, olivine and bentonite. According to the soil passivating agent containing the sepiolite, the biological carbon and the humic acid, the ecological hazard of heavy metal ions can be reduced through effects such as complexation and electrostatic adsorption of the biological carbon and the heavy metal ions, and the sepiolite can generate ion-exchange action with heavy metal in soil to fix the heavy metal in the soil, so that the purpose of heavy metal pollution removing is achieved. The passivating agent is especially suitable for being applied to the sewage irrigation area farmland soil, soil fertility can be increased, and the hazard of the heavy metal can also be effectively reduced.

Description

technical field [0001] The invention belongs to the field of remediation of soil heavy metal pollution, and in particular relates to a method for preparing and applying a remediation material for in-situ passivation of soil heavy metals and improvement of soil properties. Background technique [0002] The in-situ passivation restoration of heavy metal contaminated soil refers to adding one or more active substances to the contaminated soil, such as clay minerals, phosphate, organic materials and microorganisms, etc., by adjusting the physical and chemical properties of the soil and precipitation, adsorption, complexation, redox A series of reactions such as changing the chemical form and occurrence state of heavy metal elements in the soil, reducing their mobility and bioavailability in the soil, thereby reducing the impact of these heavy metal pollutants on environmental receptors (such as animals, plants, microorganisms, water bodies, etc.) and humans, etc.) to achieve the...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08B09C1/085C09K17/40
Inventor 孙在金侯红魏源马瑾林祥龙赵淑婷
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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