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Chemical leaching repairing method for heavy metal and arsenic mercury contaminated soil

A technology of chemical leaching and remediation method, which is applied in the field of chemical leaching and remediation of soil containing polymetallic pollution, achieving good removal effect, low cost and good removal effect

Active Publication Date: 2009-02-11
SUN YAT SEN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the existing soil heavy metal pollution control, and to provide a soil chemical leaching repair method that has a control effect on both heavy metals and arsenic and mercury at the same time

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1: Soil Remediation

[0020] Collect the contaminated soil from the former warehouse of Guangzhou Nitrogen Fertilizer Factory. The background content of heavy metals in the soil is: arsenic content 74.4mg / kg, copper 325.0mg / kg, cadmium 1.73mg / kg, lead 254.4mg / kg, zinc 258.6mg / kg, pH=7.31. The collected soil was naturally air-dried at room temperature, and then the soil was lightly crushed and passed through a 2mm sieve.

[0021] Weigh 1g of the sieved soil into a centrifuge tube, add 0.01mol / L Na 2 The EDTA solution was shaken and washed at room temperature, the horizontal shaking speed was 180 rpm, centrifuged, and the eluate was discarded; Na 2 The liquid-solid ratio of EDTA solution and soil is 20:1 (ml / g).

[0022] Then add 0.1mol / L oxalic acid solution to the treated soil, shake and wash at room temperature, the horizontal shaking speed is 180 rpm, centrifuge, discard the eluate; the liquid-solid volume ratio of oxalic acid solution and soil is 20:1 (ml / ...

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Abstract

The invention relates to soil heavy metal pollution treatment technology, in particular to a chemical leaching restoration method used for heavy metal and arsenic mercury polluted soil. Prior soil chemical leaching restoration methods concentrate on the polluted soil caused by one or a plurality of heavy metals (cadmium, copper, lead and zinc, etc.,), which do not have ideal restoration effect to soil with the pollution of both arsenic in the form of negative ions and mercury which is volatile metal. Aiming at the problem, the method uses the combination of three reagents, namely, Na2EDTA, oxalic acid and KI and leaching method with fractional steps for realizing the chemical restoration of the cadmium, the copper, the lead, the zinc, the arsenic and the mercury, etc., in the polluted soil so that the heavy metal in the polluted soil can reach the environmental safety standards. The soil after the leaching treatment is washed by water, and then is refilled in the original position; therefore, no secondary pollution can be caused.

Description

technical field [0001] The invention relates to soil heavy metal pollution control technology, in particular to a chemical leaching repair method for soil containing polymetallic pollution. Background technique [0002] Due to the hidden, long-term and irreversible characteristics of soil heavy metal pollution, it is difficult to control once it is polluted. Over the past ten years in my country, phytoremediation technology for heavy metal-contaminated soil has attracted a lot of attention due to its low cost and environmental friendliness. However, heavy metal hyperaccumulating plants have the characteristics of slow growth, low biomass, special growth environment, limited by local climatic conditions and available plant species, and it is difficult to meet the requirements of rapid treatment of industrial wasteland. Therefore, the soil leaching technology with wide adaptability and rapidity has always been a difficult and hot research topic in the world, and has been wide...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
Inventor 仇荣亮邹泽李董汉英赵芝灏张涛章卫华韦献革
Owner SUN YAT SEN UNIV
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