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A kind of preparation and application method of soil heavy metal passivator with low secondary environmental risk

A heavy metal passivator, environmental risk technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve problems such as secondary pollution, to ensure stability, reduce pollutant release, reduce Effects of Environmental Risk

Active Publication Date: 2020-11-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the possibility that passivators may introduce heavy metals or salts into the soil and cause secondary pollution, the purpose of the present invention is to provide a method for preparing and using soil heavy metal passivators with low secondary environmental risks

Method used

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  • A kind of preparation and application method of soil heavy metal passivator with low secondary environmental risk
  • A kind of preparation and application method of soil heavy metal passivator with low secondary environmental risk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step is to crush the straw (in this example, corn straw is used, because it is relatively soft and the humification process is relatively quick; but in fact, wheat straw, rice straw, sorghum straw, etc. are all available, and there is no specific requirement) crushed, passing 0.3 mm sieve, then mixed with a stalk-to-water ratio of 1g:50mL, left to humify, and then pulled out to obtain humified straw for later use; another crushed straw passed through a 0.3mm sieve to obtain crushed straw with uniform particle size ; The fly ash is directly crushed and passed through a 0.1mm sieve to obtain fly ash powder with uniform particle size.

[0028] In the second step, the sampled loess (non-polluted loess) is passed through a 0.05mm sieve, and according to the mass ratio of loess:NaCl aqueous solution of 1:2, the uniform particle loess of the sieve is added in the NaCl aqueous solution (0.1mol / L), wetted And leave standstill 4h, obtain mixed solution; According to mas...

Embodiment 2

[0035] The first step is to crush the stalks (corn stalks), pass them through a 0.3mm sieve, then mix them at a ratio of 1g:50mL of stalks to water, let them stand for humification, and then remove them to obtain humified straws, which are set aside; Pass the straw through a 0.3mm sieve to obtain crushed straw with uniform particle size; directly crush the fly ash and pass through a 0.1mm sieve to obtain fly ash powder with uniform particle size;

[0036] In the second step, the sampled loess (non-polluted loess) is passed through a 0.05mm sieve, and according to the mass ratio of loess:NaCl aqueous solution of 1:2, the uniform particle loess of the sieve is added in the NaCl aqueous solution (0.1mol / L), wetted And leave it alone for 4h to obtain a mixed solution; according to the mass ratio of loess: pure water=1:10, add pure water to the mixed solution to obtain a mixture, which is then dispersed in an ultrasonic instrument, and the ultrasonic conditions are: power 75w, time ...

Embodiment 3

[0043] The first step is to crush the stalks (corn stalks), pass them through a 0.3mm sieve, then mix them at a ratio of 1g:50mL of stalks to water, let them stand for humification, and then remove them to obtain humified straws, which are set aside; Pass the straw through a 0.3mm sieve to obtain crushed straw with uniform particle size; directly crush the fly ash and pass through a 0.1mm sieve to obtain fly ash powder with uniform particle size;

[0044] In the second step, the sampled loess (non-polluted loess) is passed through a 0.05mm sieve, and according to the mass ratio of loess:NaCl aqueous solution of 1:2, the uniform particle loess of the sieve is added in the NaCl aqueous solution (0.1mol / L), wetted And leave standstill 4h, get mixed solution; According to mass ratio loess: pure water=1:10, add pure water in mixed solution, obtain mixture, put in ultrasonic instrument and disperse again, ultrasonic condition is: power 50w, time 20min, temperature room temperature. ...

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Abstract

The invention provides a preparation method of a low secondary environmental risk soil heavy metal passivator and an application method thereof. The preparation method comprises the following steps: mixing humified straw, crushed straw, fly ash and clay mineral and granulating a mixture to obtain a uniform granular passivator; spraying the granular passivator with a sodium alginate aqueous solution and a polyvinyl alcohol aqueous solution to complete an embedding process, and then performing freeze drying to obtain the slow release-type granular passivator. The application method is characterized in that the slow release-type granular passivator is used for applying in the polluted undisturbed soil, wherein the applying proportion is 5-20%, and the passivation period is 30-120 days. The prepared low secondary environmental risk soil heavy metal passivator inhibits the secondary pollution of soil due to the passivator, promotes the form change, adsorption and migration of the heavy metals by the passivator, guarantees stability of a soil heavy metal removal process, and reduces the environment risk for repairing heavy metal soil by the passivator, the soil property influence after slow release is little, the pollutant release is reduced, and a target of eco-environment-oriented passivation is achieved.

Description

technical field [0001] The invention relates to the field of slowing down the toxicity of passivating agents for heavy metal pollution in soil, in particular to the preparation and use of a substance for slowing down the toxicity of passivating agents. Background technique [0002] In the earth's natural environment, soil is a vital component and plays an extremely important role in the survival and development of human beings. Heavy metals are often the main pollution problems in soil, especially the pollution problems of Pb and Cd. They accumulate in the rhizosphere of plants planted in the soil, and use this as a channel to enter the human body, endangering human health. For example, the stress of Pb can affect the absorption of mineral nutrients and water by crop roots, resulting in slow growth of crops; Pb can also change the electron transfer process of photosynthesis, and inhibit photosynthetic activity by destroying the synthesis of enzymes; It enters the crop body...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 范春辉董婉清
Owner SHAANXI UNIV OF SCI & TECH
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