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Heavy metal contaminated soil washing method

A technology for polluting soil and heavy metals, which is applied in the field of heavy metal-contaminated soil leaching, can solve the problems of long recovery time, large component loss, secondary pollution, etc., and achieve the effect of taking into account environmental friendliness, broadening the scope of application, and high removal rate

Inactive Publication Date: 2015-01-21
TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on the use of organic acids for the remediation of single-type metal-contaminated soils has achieved certain results, but there are few reports on the use of organic acids and additives to remediate polymetallic-contaminated soils and the treatment of leaching wastewater.
At the same time, the effective components of the eluting agent are greatly lost, the recovery time is long, and the recovered and concentrated pollutants are difficult to completely eliminate, which will easily cause the pollutants to enter the environmental system again, causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 5g of lead-contaminated soil into a 250ml Erlenmeyer flask, use a leaching agent mixed with citric acid and sodium chloride, the mass ratio of citric acid and sodium chloride is 2:1, the solution of leaching agent and soil The solid ratio is 20:1, then place it on a magnetic stirrer and stir for 2 hours, then use a pipette to take out about 4ml of the stirred supernatant and put it into a clean centrifuge tube, and set the centrifuge to a speed of 5000r / min, centrifuged for 10 minutes, for solid-liquid separation. Then take out, filter, dilute, and measure the concentration of heavy metals in the solution with an atomic absorption spectrometer. At the same time, the remaining soil in the Erlenmeyer flask was filtered with a vacuum pump, air-dried, weighed with an electronic balance, digested with microwaves, and the concentration of heavy metals in the soil sample was measured with an atomic absorption spectrometer. It is measured that the removal rate of lead aft...

Embodiment 2

[0017] Put 5g of cadmium-contaminated soil into a 250ml Erlenmeyer flask, use a leaching agent mixed with citric acid and sodium chloride, the mass ratio of citric acid and sodium chloride is 5:1, the liquid-solid concentration of the leaching agent and soil The ratio is 20:1, then it is placed on a magnetic stirrer and stirred for 2h, and then about 4ml of the stirred supernatant is taken out with a pipette and put into a clean centrifuge tube, and the centrifuge is set at a speed of 5000r / min, centrifuged for 10 minutes for solid-liquid separation. Then take out, filter, dilute, and measure the concentration of heavy metals in the solution with an atomic absorption spectrometer. At the same time, the remaining soil in the Erlenmeyer flask was filtered with a vacuum pump, air-dried, weighed with an electronic balance, digested with microwaves, and the concentration of heavy metals in the soil sample was measured with an atomic absorption spectrometer. It is measured that th...

Embodiment 3

[0019] Put 5g of cadmium-contaminated soil into a 250ml Erlenmeyer flask, use a leaching agent mixed with oxalic acid and sodium chloride, the mass ratio of oxalic acid to sodium chloride is 4:1, and the liquid-solid ratio of the leaching agent to soil is 20:1, then place it on a magnetic stirrer and stir for 2 hours, then use a pipette to take out about 4ml of the stirred supernatant and put it into a clean centrifuge tube, set the centrifuge to a speed of 5000r / min, Centrifuge for 10 minutes for solid-liquid separation. Then take out, filter, dilute, and measure the concentration of heavy metals in the solution with an atomic absorption spectrometer. At the same time, the remaining soil in the Erlenmeyer flask was filtered with a vacuum pump, air-dried, weighed with an electronic balance, digested with microwaves, and the concentration of heavy metals in the soil sample was measured with an atomic absorption spectrometer. It is measured that the removal rate of lead after l...

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Abstract

The invention provides a heavy metal contaminated soil washing method. The method comprises the following steps: compounding organic acid and aids into a washing solution; fully mixing the washing solution and heavy metal contaminated soil in a stirring reactor for a long time, removing heavy metals in the washed liquid waste by virtue of an adsorbent, and recycling the residual liquid waste which serves as a washing solution. According to the method, desorption and solubilization of the heavy metals in the soil can be facilitated by compounding the organic acid and aids, the application range of the washing solution is widened, and secondary pollution to the environment is avoided. The heavy metal contaminated soil washing method disclosed by the invention has the advantages of simple process, simplicity in operation, environment friendliness, high removal efficiency, washing solution recyclability, agent and water resource conservation, and the like.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution control, and in particular relates to a method for rinsing heavy metal polluted soil. Background technique [0002] The soil polluted by heavy metals in my country accounts for about 1 / 6 of the total cultivated land, and the amount of food polluted by heavy metals is as high as millions of tons every year. In some polluted sites, the coexistence of metal Cu, Pb, Zn and other complex pollution characteristics is more common, and the pollution concentration is relatively high. Due to the high accumulation, concealment and biodegradability of heavy metals, not only a large amount of land cannot be cultivated and put on hold, but also through the food chain, it will endanger human health. [0003] At present, the treatment of heavy metal-contaminated soil involved in domestic and foreign research and applied in the actual treatment process mainly includes solidification and removal. In rece...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 张景辉杨伟刘汉桥
Owner TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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