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Eluting agent for heavy metal contaminated soil and eluting and recycling methods thereof

A technology for polluted soil and leaching agent, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc. High efficiency and no environmental risk effect

Inactive Publication Date: 2019-01-04
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional eluents are expensive and prone to secondary pollution.
[0004] Chinese patent document CN104772329A discloses a method for ultrasonically intensified organic acid leaching of heavy metal-contaminated soil. First, organic acid is mixed with heavy metal-contaminated soil, and then ultrasonic-enhanced organic acid is used for leaching heavy metal-contaminated soil. The ultrasonic frequency is 20-40kHz. The sound energy density is 20-50W / L, and the leaching time of ultrasonically strengthened organic acid leaching heavy metal-contaminated soil is 5-20min. The present invention improves the leaching effect of heavy metal-contaminated soil and changes the form distribution of heavy metals. Heavy metals in the soil are removed into the eluent, heavy metals cannot be removed from the eluent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A leaching agent for heavy metal polluted soil, the leaching agent is a mixed aqueous solution of an organic acid and a biosurfactant alkyl glycoside, the concentration of the organic acid in the mixed aqueous solution is: 0.1mol / L, the concentration of the alkyl glycoside Concentration: 2.5%.

[0047]The organic acid is citric acid, and the alkyl glycoside is fatty alcohol polyoxyethylene ether glucoside.

[0048] Utilize above-mentioned leaching agent to carry out the method for leaching heavy metal contaminated soil and reclaiming leaching agent, the steps are as follows:

[0049] (1) Add 1g of heavy metal-contaminated soil into 10ml of eluent, stir evenly and oscillate to make the eluent fully react with heavy metal ions, complete soil remediation, and separate soil and eluent by centrifuging at 5000rpm for 5min , add 3mol / L NaOH solution to the separated eluent, adjust the pH to 9, precipitate the heavy metal ions in the eluent, and centrifuge at a speed of 5000rp...

Embodiment 2

[0064] A leaching agent for soil polluted by heavy metals, the leaching agent is a mixed aqueous solution of an organic acid and a biosurfactant alkyl glycoside, the concentration of the organic acid in the mixed aqueous solution is: 0.08mol / L, and the concentration of the alkyl glycoside Concentration: 5.0%.

[0065] The organic acid is oxalic acid, and the alkyl glycoside is a C8-C11 branched chain alkyl glycoside.

[0066] The method for rinsing heavy metal-contaminated soil is carried out according to the method in Example 1.

[0067] The concentration of heavy metals in heavy metal-contaminated soil after leaching was measured, and it was found that the evaluated concentrations of Cd, Pb, Cr, Cu, and Zn were reduced by 78%, 81%, 74%, 71%, and 81%, respectively.

Embodiment 3

[0069] A leaching agent for soil polluted by heavy metals, the leaching agent is a mixed aqueous solution of an organic acid and a biosurfactant alkyl glycoside, the concentration of the organic acid in the mixed aqueous solution is: 0.08mol / L, and the concentration of the alkyl glycoside Concentration: 6.0%.

[0070] The organic acid is succinic acid, and the alkyl glucoside is fatty alcohol polyoxyethylene ether glucoside and n-hexyl glucoside.

[0071] The method for rinsing heavy metal-contaminated soil is carried out according to the method in Example 1.

[0072] The concentration of heavy metals in heavy metal-contaminated soil after leaching was measured, and it was found that the evaluated concentrations of Cd, Pb, Cr, Cu, and Zn were reduced by 87%, 85%, 72%, 74%, and 79%, respectively.

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Abstract

The invention relates to an eluting agent for heavy metal contaminated soil and eluting and recycling methods thereof. The eluting agent is a mixed water solution of organic acid and biosurfactant alkyl glycoside. The concentration of the organic acid in the mixed water solution is 0.05-0.1 mol / L, and the concentration of alkyl glycoside is 0.2-8%. The raw materials used by the eluting agent are low in price and environmentally friendly; the eluting method is simple and easy to carry out, eluted soil can be directly backfilled, the eluting agent can be recycled multiple times, the recycling method is simple and easy to carry out, and the application prospect in restoration of the heavy metal contaminated soil is broad.

Description

technical field [0001] The invention relates to a leaching agent for heavy metal polluted soil and a leaching recovery method thereof, belonging to the field of environmental protection. Background technique [0002] In recent years, with the rapid development of industry and agriculture, various pollutants have continuously entered the soil through the abuse of chemical fertilizers and pesticides, and the wanton discharge of waste from industrial and mining enterprises, which has caused the deterioration of the ecological environment and seriously threatened the sustainable development of agriculture. and even human health. Among them, heavy metal ion pollution represented by copper, zinc, and cadmium ions has caused serious damage to the soil. The U.S. EPA Priority Control List pointed out that among the 1200 contaminated soils, 37% of the sites were polluted by heavy metals. At present, in our country, there are about 1×108hm 2 Nearly one-fifth of the cultivated land i...

Claims

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Application Information

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IPC IPC(8): C09K17/32B09C1/02B09C1/08
CPCB09C1/02B09C1/08C09K17/32
Inventor 沈玉文林海涛范文静马征刘苹宋效宗王江涛
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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