Rapid passivation and repair process for pollution of soil heavy metals Cr, Cu, Pb and Zn

A heavy metal and soil technology, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of increased pH value of the treated soil, defects in overall planning of restoration and utilization, and high dosage of filling, and achieve effective results It embodies the effect of short time period, elimination of biological negative effects, and meeting the requirements of conditions

Inactive Publication Date: 2013-09-18
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, the defects or deficiencies of this technology are: 1) It only has a stabilizing effect on the Pb element, and the positive and negative environmental behavior effects on other elements are not clear; these situations are mostly multi-element comprehensive pollution problems in the current soil heavy metal pollution 2) When the sodium silicate filling amount of this technology is at least 0.8% of the treated soil, the soluble Pb content in the treated soil is reduced from 8.98mg/kg (L) to 5.23mg/kg (L), that is, the effective state content after treatment can be reduced by 41.76% compared with that without treatment; the amount of sodium silicat

Method used

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  • Rapid passivation and repair process for pollution of soil heavy metals Cr, Cu, Pb and Zn
  • Rapid passivation and repair process for pollution of soil heavy metals Cr, Cu, Pb and Zn
  • Rapid passivation and repair process for pollution of soil heavy metals Cr, Cu, Pb and Zn

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Experimental program
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Effect test

Embodiment 1

[0022] In the laboratory, the farmland yellow-brown soil in the Hetao area of ​​Inner Mongolia was used as the experimental object. The experimental soil moisture content was 25%, and the pH value was 7.0. At 22°C, the test soil was evenly sprayed with sodium silicate nonahydrate (Na 2 SiO 3 9H 2 O) The solution acts on it. The amount of solution to be added should not make the soil water content greater than 25% - by adjusting the experimental soil water content or passivator solution concentration. After keeping the experimental conditions for different periods of time, samples were taken to measure the available content of Cr, Cu, Pb, and Zn in the soil, so as to understand the changes in the bioavailability of Cr, Cu, Pb, and Zn. The heavy metal bioavailability passivation achieved by this method can quickly (15 days) significantly reduce the available content of the four elements of Cr, Cu, Pb, and Zn without affecting the normal conditions of the soil. The results are...

Embodiment 2

[0027] In the laboratory, the farmland yellow-brown soil in the Hetao area of ​​Inner Mongolia was used as the experimental object. The experimental soil moisture content was 25%, and the pH value was 7.0. At 22°C, the weight of the passivating agent was added to the experimental soil at 0.5‰ of the experimental soil weight of sodium silicate nonahydrate (Na 2 SiO 3 9H 2 O) act with it. The amount of solution to be added should not make the soil water content greater than 25% - by adjusting the experimental soil water content or passivator solution concentration. After maintaining the experimental conditions for different periods of time, samples were taken to measure the residual content of Cr, Cu, Pb, and Zn in the soil, so as to understand the changes in the bioavailability of Cr, Cu, Pb, and Zn. The bioavailable passivation of heavy metals achieved by this method can rapidly (15 days) significantly increase the residual content of Cr, Cu, Pb, and Zn without affecting th...

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Abstract

The invention provides a rapid passivation and repair process for pollution of soil heavy metals Cr, Cu, Pb and Zn and belongs to the technical field of environment protection. A component of a repairing agent is sodium silicate nonahydrate, namely sodium metasilicate with the chemical formula of Na2SiO3*9H2O. The rapid passivation and repair process provided by the invention is aimed at a fundamental mechanism that the essential effect of effectively reducing heavy metal components in a soil system is to transform a compound containing the metal components into a chemical form which is lower in environmental activity, stronger in stability in the environment and not easy to transfer and not easily absorbed by living bodies (which are mainly plants), so as to strengthen the contribution of a chemical action process in metal shape transformation; silicate is directly selected as a passivation acting agent, so that physiochemical properties of acted soil are not obviously changed and the metal components in the soil system are rapidly acted to form a compound type which is lower in the environmental activity, stronger in the stability in the environment and is not easy to transfer and not easily absorbed by the living bodies; and therefore, the aim of reducing the biological effectiveness of the metal components, namely passivating the metal components, is realized.

Description

technical field [0001] The present invention relates to a remediation method for reducing the bioavailability of polluted heavy metal elements in soil heavy metal pollution remediation, which can make heavy metal elements in the soil refractory to insoluble or The insoluble compound species shifts, thereby rapidly reducing its bioavailability. Background technique [0002] Soil heavy metal pollution has become a serious environmental problem at present, and the demand for pollution remediation and treatment is increasing day by day. The current restoration and treatment methods can be summarized in two aspects: 1. Reduce the bioavailability of heavy metals by adding other substances to the contaminated soil so that they do not enter or less enter the plants growing in the soil; 2. Through engineering Heavy metals are removed from the soil by means of bioabsorption and transfer. The above treatment methods can be divided into three categories: physical restoration, chemical...

Claims

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Application Information

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IPC IPC(8): B09C1/08C09K17/12
Inventor 张辉汤正泽
Owner SHANGHAI JIAO TONG UNIV
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