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Ecological method for in-situ passivating soil heavy mental without additional exterior component

A heavy metal and soil technology, applied in the restoration of polluted soil, etc., to achieve obvious passivation effect, low cost and strong practicability

Active Publication Date: 2015-12-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no reports on the use of loess organic-inorganic complexes as passivation materials to remediate soil Pb / Cd complex pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Remove impurities and homogenize the loess sample: take a certain amount of loess sample (the loess sample is taken from uncontaminated dry land loess) and NaCl saturated aqueous solution, place the loess sample and NaCl saturated aqueous solution in an ultrasonic environment, and stir in a water bath for 20 minutes, Skim off a small amount of floating impurities on the surface, and then filter with filter paper, wherein the ratio of loess sample (40g) to NaCl saturated aqueous solution is 1g:40mL (that is, every 1g loess sample is mixed with 40mL NaCl saturated aqueous solution), the ultrasonic power is 100W, and the water bath The temperature is 25°C, and the stirring rate is 80rpm;

[0026] 2) Transfer the filtrate on the filter paper into the graduated cylinder, then add water to the 1000mL scale of the graduated cylinder (45cm height), then stir (4min), after stirring, follow the look-up table (the ratio of soil to water is 4%; the temperature is 25 ℃) obtained ...

Embodiment 2

[0032]1) Remove impurities and homogenize the loess sample: take a certain amount of loess sample (the loess sample is taken from uncontaminated dry land loess) and NaCl saturated aqueous solution, place the loess sample and NaCl saturated aqueous solution in an ultrasonic environment, and stir in a water bath for 15 minutes, Skim off a small amount of floating impurities on the surface, and then filter with filter paper. The ratio of loess sample (40g) to NaCl saturated aqueous solution is 1g: 30mL (that is, every 1g loess sample is mixed with 30mL NaCl saturated aqueous solution), the ultrasonic power is 75W, and the water bath The temperature is 35°C, and the stirring rate is 60rpm;

[0033] 2) Transfer the filtrate on the filter paper into the graduated cylinder, then add water to the 1000mL scale of the graduated cylinder (45cm height), then stir (3min), after stirring, follow the table look-up (the soil-water ratio is 4%; the temperature is 25 ℃) to obtain the Stokes set...

Embodiment 3

[0037] 1) Remove impurities and homogenize the loess sample: take a certain amount of loess sample (the loess sample is taken from uncontaminated dry land loess) and NaCl saturated aqueous solution, place the loess sample and NaCl saturated aqueous solution in an ultrasonic environment, and stir in a water bath for 10 minutes, Skim off a small amount of floating impurities on the surface, and then filter with filter paper, wherein the ratio of loess sample (40g) to NaCl saturated aqueous solution is 1g:20mL (that is, every 1g loess sample is mixed with 20mL NaCl saturated aqueous solution), the ultrasonic power is 50W, and the water bath The temperature is 15°C, and the stirring rate is 40rpm;

[0038] 2) Transfer the filtrate on the filter paper into a graduated cylinder, then add water to the 1000mL scale of the graduated cylinder (45cm height), then stir (2min), after stirring, follow the look-up table (the ratio of soil to water is 4%; the temperature is 25 ℃) to obtain th...

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PUM

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Abstract

The invention discloses an ecological method for in-situ passivating soil heavy mental without additional exterior component . The ecological method comprises the following steps: stirring and filtering a soil sample and a NaCl saturated solution in an ultrasonic-wave environment to obtain a pre-treated soil sample; transferring the soil sample into a settling container, repeatedly extracting the soil sample with water to obtain a soil clay-particle-level organic and inorganic composite; and realizing in-situ passivating repair of Pb / Cd combined pollution by the soil clay-particle-level organic and inorganic composite by adopting a nylon mesh bag method. The method is obvious in passivating effect, low in cost, simple and convenient in operation, good in ecological safety, small in environmental disturbance, high in practicability, and capable of conserving a soil ecological function while carrying out passivating repair of Pb / Cd combined pollution, and has a potential popularization and application value.

Description

technical field [0001] The invention relates to a soil heavy metal passivation method, in particular to an ecological method for in-situ passivation of soil heavy metals without adding exogenous components. Background technique [0002] Soil is an important component of ecosystems and the basic interface on which human beings depend. In recent years, with the development of economy and society, soil heavy metal pollution has become more and more serious. According to reports, at least 30% of my country's land is polluted by heavy metals, among which Pb and Cd have become the most widely polluted and most toxic heavy metal pollutants in my country's soil. Heavy metal pollutants cannot be degraded, have a long residual period, and have a significant "three effects" effect; how to purify soil heavy metal pollutants and restore the inherent ecological functions of the pedosphere has become a key issue of concern to environmental ecologists around the world. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 范春辉
Owner SHAANXI UNIV OF SCI & TECH
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