Heavy metal passivation repair method capable of removing passivator from soil

A remediation method and passivating agent technology, applied in the field of soil remediation, achieves the effects of fast adsorption rate, high remediation cost, and avoiding potential environmental risks

Pending Publication Date: 2019-08-02
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, soil environmental protection requires avoiding new soil environmental problems while solving certain soil environmental problems, that is to say, soil heavy metal passivation restoration should avoid the potential risk of passivators remaining in the soil

Method used

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  • Heavy metal passivation repair method capable of removing passivator from soil
  • Heavy metal passivation repair method capable of removing passivator from soil
  • Heavy metal passivation repair method capable of removing passivator from soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Mixed application and package application on the effect of passivation of heavy metals in the soil

[0038] In this example, OCB passivator and Guixi red soil were taken as examples to study the effects of two methods of mixed application and package application on the adsorption effect of heavy metals in the soil, and the addition of OCB was 1%, 3%, and 5%. Depend on figure 1 It can be seen that with the increase of the amount of OCB added, the content of available Cu in the soil of the mixed application treatment was lower than that of the control without OCB, and decreased by 34.91%, 64.44%, and 76.19% respectively compared with the control after 60 days of cultivation. The influence of incubation time on the content of available Cu in soil was not significant. Different from the mixed fertilization treatment, the content of available Cu in the soil decreased significantly with the increase of the culture time. When the culture reached 60 days, the content...

Embodiment 2

[0042] The migration distance of embodiment 2 heavy metals in soil

[0043] Such as figure 2 As shown, for cinnamon soil and fluvo-aquic soil, at 10-30cm away from the passivator, the effect of reducing the available Cu content in the soil is obvious, which is equivalent to the passivation effect of mixed application. When the distance of passivating agent was greater than 30cm, the available Cu content in the soil increased significantly. Compared with the mixed application, the available Cu content in cinnamon soil and fluvo-aquic soil increased by 17.78% and 24.09%, respectively. Therefore, the distance to choose the passivator to be applied is within 30cm. Considering that it is used as an operation surface for farmland farming during the growth process, especially mechanical farming, so the burying distance of the passivator is selected to be within 25-30cm.

Embodiment 3

[0044] Embodiment 3 The influence of different water contents of soil on passivating agent remediation efficiency

[0045] The initial value of DTPA-Cd content in simulated polluted soil was 3.94mg / kg. After 40 days of pot experiments, the changes of DTPA-Cd content in the ryegrass plant-soil system were as follows: image 3 : The initial mass concentration of DTPA-Cd in the polluted soil is 3.94mg / kg, after 40 days of pot culture, it is found that the DTPA-Cd content of the water content is 50%, 60%, 70%, 80% treatment group from 3.94mg / kg Respectively decreased to 3.34mg / kg, 3.27mg / kg, 2.98mg / kg, 2.83mg / kg, Cd decreased respectively: 15.15%, 16.96%, 24.29%, 28.04%. It shows that with the increase of water content, it is beneficial for the heavy metal ions in the soil to migrate to the passivator package, thereby enhancing the passivation effect of MBC.

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Abstract

The invention belongs to the technical field of soil repair and specifically relates to a heavy metal passivation repair method capable of removing a passivator from soil. Aiming at the heavy metal pollution characteristic in farmland soil of China, an in-situ passivation repair technique becomes a current mainstream technique. According to the technique, the passivator is mixed in soil, and the passivator left in soil has a potential environmental risk. The invention provides the heavy metal passivation repair method capable of removing the passivator from soil. The method is equivalent to mixing in passivation efficiency, does not affect field husbandry and also can recycle the passivator. According to the average grain size of the passivator, the passivator bagged in a stripe-type nylonbag is buried in soil, a certain distance and depth, from the root system of a crop, a certain field specific retention is maintained, and heavy metal passivation is achieved. After saturated adsorption, the nylon bag is recovered and the passivator is regenerated. The method reduces influence of the passivator to field soil obviously, and the passivator is convenient to recover and can be recycled, so that the method has good promotional meaning.

Description

technical field [0001] The disclosure belongs to the technical field of soil remediation, and in particular relates to a heavy metal passivation remediation method suitable for removing a passivator from the soil in farmland soil. Background technique [0002] The information disclosed in this Background section is only intended to increase the understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those skilled in the art. [0003] Soil heavy metal pollution has become one of the most widely polluted and most harmful environmental problems in China, and poses a great threat to my country's economic development. The characteristics of farmland soil pollution in my country are as follows: (1) The area of ​​heavy metal pollution in the soil is extensive. According to reports, the area of ​​cultivated land polluted by heavy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 成杰民赵炳祥马叶
Owner SHANDONG NORMAL UNIV
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