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A kind of detoxification method of chromium polluted soil

A technology for chromium-contaminated soil and an electrolytic cell is applied in the field of remediation of contaminated soil, which can solve the problems of low detoxification efficiency and achieve the effects of high-efficiency detoxification, improved migration activity, and increased contact area.

Active Publication Date: 2021-05-11
浙江慧科环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a detoxification method for chromium-contaminated soil, to solve the problem of low detoxification efficiency of low-valent iron-based materials for hexavalent chromium-contaminated soil

Method used

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  • A kind of detoxification method of chromium polluted soil
  • A kind of detoxification method of chromium polluted soil
  • A kind of detoxification method of chromium polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The effect of oxalic acid and chromium-contaminated soil powder mass percentage on the reduction efficiency of hexavalent chromium:

[0029] Weigh the chromium-contaminated soil, grind it after drying, and pass through a 100-mesh sieve to obtain a chromium-contaminated soil powder sample. Weigh oxalic acid according to the mass percentage of oxalic acid and chromium-contaminated soil powder sample at 3.2%, 3.5%, 3.8%, 4%, 6%, 8%, 8.2%, and 8.5%, and weigh 3% of the mass percentage of iron powder and chromium-contaminated soil powder sample. Take iron powder, mix oxalic acid, iron powder, and chromium-contaminated soil powder sample, and grind for 2 hours to obtain activated chromium-contaminated soil powder sample. Place the activated chromium-contaminated soil powder sample in the sample area of ​​the electrolytic cell with aeration and stirring functions. Add water to the electrolytic cell according to the ratio of activated chromium-contaminated soil powder sample t...

Embodiment 2

[0038] Effect of iron powder and chromium-contaminated soil powder mass percentage on the reduction efficiency of hexavalent chromium:

[0039] Weigh the chromium-contaminated soil, grind it after drying, and pass through a 250-mesh sieve to obtain a chromium-contaminated soil powder sample. Take oxalic acid according to 6% mass percentage of oxalic acid and chromium polluted soil powder sample, iron powder and chromium polluted soil powder sample mass percentage 2.2%, 2.5%, 2.8%, 3%, 4%, 5%, 6%, 6.2%, 6.5% and 6.8% weigh iron powder, mix oxalic acid, iron powder, and chromium-contaminated soil powder, and grind for 3 hours to obtain activated chromium-contaminated soil powder. Place the activated chromium-contaminated soil powder sample in the sample area of ​​the electrolytic cell with aeration and stirring functions. Add water to the electrolytic cell according to the ratio of activated chromium-contaminated soil powder sample to water-solid-liquid ratio of 1:1.5g / mL. The...

Embodiment 3

[0048] The effect of voltage gradient change on the reduction efficiency of hexavalent chromium:

[0049] Weigh the chromium-contaminated soil, grind it after drying, and pass through a 100-mesh sieve to obtain a chromium-contaminated soil powder sample. Take oxalic acid according to 6% mass percentage of oxalic acid and chromium polluted soil powder sample, iron powder and 6% mass percentage of chromium polluted soil powder sample weigh iron powder, mix oxalic acid, iron powder, chromium polluted soil powder sample, grind for 4 hours, Activated chromium-contaminated soil powder samples were obtained. Place the activated chromium-contaminated soil powder sample in the sample area of ​​the electrolytic cell with aeration and stirring functions. Add water to the electrolytic cell according to the ratio of activated chromium-contaminated soil powder sample to water-solid-liquid ratio of 1:2g / mL. The electrolyzer is energized for 3 hours, and the voltage gradient is controlled a...

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Abstract

The invention discloses a detoxification method for chromium-contaminated soil, which comprises the following steps: S1, taking chromium-contaminated soil, drying, grinding, and sieving to obtain a chromium-contaminated soil powder sample; S2, weighing oxalic acid and iron powder, mixing oxalic acid, Mix and grind iron powder and chromium-contaminated soil powder sample to obtain activated chromium-contaminated soil powder sample; S3, place the activated chromium-contaminated soil powder sample in an electrolytic cell with aeration and stirring functions, and add water to the electrolytic cell; S4, Power on the electrolytic cell, stir and aerate at the same time, take out the soil sample after the power is cut off, and dry it to obtain detoxified soil. The method of the invention realizes reducing more than 99% of the hexavalent chromium in the chromium-polluted soil to the trivalent chromium under the condition of adding low-dose iron-based materials. Simultaneously, the method of the invention has simple operation, low equipment requirements, and can be directly industrialized and popularized.

Description

technical field [0001] The invention relates to a restoration method of polluted soil, in particular to a detoxification method of chromium-polluted soil. Background technique [0002] Among all heavy metal polluted sites, chromium polluted sites accounted for a large proportion. Excess chromium in soil is mainly caused by improper discharge of industrial waste. Chromium usually exists in the natural environment in two stable valence states of trivalent chromium and hexavalent chromium. Trivalent chromium has low toxicity and is a trace element needed by the human body. Its deficiency in the human body can easily lead to diabetes. Compared with trivalent chromium, hexavalent chromium is toxic, carcinogenic, soluble and corrosive, and its toxicity is about 100 times that of trivalent chromium. Due to the high permeability of hexavalent chromium, it can affect the denaturation of proteins in the human body through skin penetration and interfere with the enzyme system. Exce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/085C09K17/40
Inventor 黄涛宋东平刘万辉周璐璐张树文
Owner 浙江慧科环保科技有限公司
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