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Method for leaching heavy metal contaminated soil by ultrasonic strengthening organic acid

A technology of polluted soil and ultrasonic wave, applied in the restoration of polluted soil and other directions, can solve the problems of limited restoration effect, high cost, and limited practical application.

Inactive Publication Date: 2015-07-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when organic acids are used alone as eluents, although they are non-toxic and easy to degrade, they have high costs and limited repair effects, which limit the practical application of this technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for supersonic-strengthening organic acid leaching of heavy metal-contaminated soil, comprising the following steps:

[0019] In the first step, 0.6mol / L citric acid is mixed with lead-zinc ore contaminated soil at a liquid-solid ratio of 10:1;

[0020] In the second step, leaching lead-zinc ore-contaminated soil with ultrasonic-enhanced citric acid is used. The ultrasonic frequency is 40 kHz, the ultrasonic sound energy density is 40 W / L, and the leaching time for ultrasonic-enhanced citric acid leaching of lead-zinc ore-contaminated soil is 8 minutes.

[0021] The effect of this embodiment: after the washing is completed, take 30mL of the mixed solution and add it to a 50mL centrifuge tube, then centrifuge the centrifuge tube at 3000rpm for 20min, take the supernatant and pass it through a 0.45μm membrane to separate the supernatant, store it in a 10% nitric acid soaked Air-dried polyethylene bottles afterward. Utilize ICP-OES (Thermo Fisher, the U.S.) to me...

Embodiment 2

[0025] A method for supersonic-strengthening organic acid leaching of heavy metal-contaminated soil, comprising the following steps:

[0026] The first step, mixes with lead-zinc ore polluted soil with 0.4mol / L tartaric acid by the liquid-solid ratio of 10:1;

[0027] The second step is to use ultrasonic-enhanced tartaric acid to leaching lead-zinc ore-contaminated soil. The ultrasonic frequency is 40kHz, the ultrasonic sound energy density is 20W / L, and the leaching time for ultrasonic-enhanced tartaric acid to leaching lead-zinc ore-contaminated soil is 16 minutes.

[0028] The beneficial effect of this embodiment:

[0029] After rinsing, take 30mL of the mixture and add it to a 50mL centrifuge tube, then centrifuge the centrifuge tube at 3000rpm for 20min, take the supernatant and pass it through a 0.45μm membrane to separate the supernatant, and store it in polyethylene that has been soaked in 10% nitric acid and then air-dried naturally. in the bottle. Utilize ICP-OES (...

Embodiment 3

[0033] A method for supersonic-strengthening organic acid leaching of heavy metal-contaminated soil, comprising the following steps:

[0034] The first step is mixed with vanadium ore polluted soil with the EDTA of 0.1mol / L by the liquid-solid ratio of 20:1;

[0035] The second step is to use ultrasonic-enhanced EDTA to leach the vanadium ore-contaminated soil. The ultrasonic frequency is 40kHz, the ultrasonic sound energy density is 20W / L, and the leaching time for ultrasonic-enhanced EDTA to elute the vanadium ore-contaminated soil is 10min.

[0036] The beneficial effect of this embodiment:

[0037] After rinsing, take 30mL of the mixture and add it to a 50mL centrifuge tube, then centrifuge the centrifuge tube at 3000rpm for 20min, take the supernatant and pass it through a 0.45μm membrane to separate the supernatant, and store it in polyethylene that has been soaked in 10% nitric acid and then air-dried naturally. in the bottle. Utilize ICP-OES (Thermo Fisher, the U.S.)...

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PUM

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Abstract

The invention relates to a method for leaching heavy metal contaminated soil by ultrasonic strengthening organic acid. The method comprises the steps of firstly, mixing organic acid and the heavy metal contaminated soil, and then leaching the heavy metal contaminated soil by the ultrasonic strengthening organic acid, wherein the ultrasonic frequency is 20-40kHz, the ultrasonic sound energy density is 20-50W / L, and the time for leaching the heavy metal contaminated soil by the ultrasonic strengthening organic acid is 5-20 minutes. After the method is used, the leaching effect of the heavy metal contaminated soil is improved, and the morphology distribution of the heavy metal is changed; the repair for leaching the heavy metal contaminated soil by the ultrasonic strengthening organic acid is an environment-friendly repair method; the method is simple in technology, short in leaching time and good in repairing effect.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal, and in particular relates to a method for ultrasonically intensified organic acid leaching of heavy metal-contaminated soil. Background technique [0002] Ultrasonic technology is generally used to crack the structure of organic matter, and has been widely used in the pretreatment of sludge, and even uses ultrasonic technology to pretreat food waste to produce acid and hydrogen. Ultrasonic waves can generate instantaneous local high temperature and high pressure, and when they act on liquids, they will cause intense and rapidly changing mechanical movements. Ultrasound has been widely used in other aspects and achieved good results. In recent years, there have been some studies on the application of ultrasonic waves to the speciation of heavy metals in soil. Y.Son et al. showed that ultrasonic cavitation can produce severe physical effects and is effective in removing pollutants fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 蒋建国王佳明李天然李德安
Owner TSINGHUA UNIV
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