Method for repairing soil polluted by white phosphorus

A technology for polluted soil and white phosphorus, applied in the field of remediation of white phosphorus polluted soil, can solve problems such as eutrophication of water bodies, and achieve the effects of improving efficiency, reducing application amount, and reducing operational safety risks.

Pending Publication Date: 2021-11-26
葛洲坝集团生态环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method ultimately sends the treated solid waste to hazardous waste landfills, resulting in higher and higher soluble phosphorus salts in the soil; and the soluble phosphorus salts in the soil enter the surface water through runoff, which will cause water body enrichment. Nutritization

Method used

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  • Method for repairing soil polluted by white phosphorus

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Effect test

Embodiment 1

[0024] This embodiment provides a method for remediating white phosphorus-contaminated soil, which specifically includes the following steps:

[0025] S1. Take 100kg of soil polluted by white phosphorus, add 600kg of water, and fully stir to obtain mud;

[0026] S2, passing the mud described in step S1 through a 5-mesh sieve to obtain the sieved mud;

[0027] S3, add 120g sodium dodecylbenzenesulfonate to the sieved mud described in step S2, stir 15min, add 10kg sodium persulfate while stirring, continue to add 1kg potassium permanganate under stirring state, stir 5h, Obtain oxidized mud;

[0028] S4, adding 6kg of sodium hydroxide to the oxidized mud described in step S3, stirring and reacting for 5h;

[0029] S5. Add 0.6kg of polyaluminum chloride-chitosan composite flocculant to the mud after the reaction in step S4, stir for 7 hours, add an appropriate amount of water while stirring to keep the soil in a mud state, and stack the treated mud on the hardened ground Soil r...

Embodiment 2

[0031] This embodiment provides a method for remediating white phosphorus-contaminated soil, which specifically includes the following steps:

[0032] S1. Take 100kg of soil polluted by white phosphorus, add 300kg of water, and fully stir to obtain mud;

[0033] S2, passing the mud described in step S1 through a 10-mesh sieve to obtain the sieved mud;

[0034] S3. Add 30g of dodecylbenzenesulfonic acid to the sieved mud described in step S2, stir for 15min, then add 5kg of sodium persulfate, continue to add 0.5kg of 30% hydrogen peroxide under stirring, stir for 4h, and obtain the oxidized mud;

[0035] S4, adding 20kg of calcium hydroxide to the oxidized mud described in step S3, stirring and reacting for 4h;

[0036] S5. Add 0.3kg polyaluminum sulfate-chitosan composite flocculant to the mud after the reaction in step S4, stir for 6 hours, add an appropriate amount of water while stirring to keep the soil in a mud state, and stack the treated mud on the hardened ground So...

Embodiment 3

[0038] This embodiment provides a method for remediating white phosphorus-contaminated soil, which specifically includes the following steps:

[0039] S1, take 100kg of soil polluted by white phosphorus, add 1000kg of water, fully stir to obtain mud;

[0040] S2, passing the mud described in step S1 through an 8-mesh sieve to obtain the sieved mud;

[0041] S3, add 300g fatty alcohol ether sodium sulfate to the sieved mud described in step S2, stir 15min, then add 15kg sodium persulfate, continue to add 2kg calcium peroxide under stirring state, stir 6h, obtain the mud after oxidation;

[0042] S4, adding 3.1 kg of calcium oxide to the oxidized mud described in step S3, stirring and reacting for 6 hours;

[0043] S5. Add 0.1kg of polyaluminum chloride to the mud after the reaction in step S4, stir for 8 hours, add appropriate amount of water while stirring to keep the soil in a mud state, stack the treated mud on the hardened ground and let it stand for 15 days to complete S...

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Abstract

The invention provides a method for repairing soil polluted by white phosphorus, which belongs to the technical field of restoration of polluted soil. The method comprises the following steps of firstly, adding water into polluted soil to prepare slurry, then removing large-particle stones in the slurry, then adding a dispersing agent to disperse simple substance phosphorus wrapped in silicon dioxide silica gel so as to enable the simple substance phosphorus to be oxidized by two strong oxidants to the greatest extent, and then continuously converting phosphorus oxide into phosphorus salt by using an alkaline substance, and finally, fixing most of the phosphorus salt in the soil through a flocculating agent. The polluted soil is repaired through the method, the content of white phosphorus in the soil can be effectively reduced to be within an acceptable range, and phosphorus is fixed in the soil and prevented from entering a water body to cause eutrophication of the water body.

Description

technical field [0001] The invention belongs to the technical field of restoration of polluted soil, and in particular relates to a method for repairing white phosphorus polluted soil. Background technique [0002] White phosphorus is a simple substance of phosphorus, which is white or light yellow translucent solid in appearance, highly toxic and insoluble in water; soft, brittle when cold, and darkens when exposed to light; it produces green phosphorescence in dark places when exposed to air And white smoke; it catches fire at about 40°C in humid air. [0003] White phosphorus is an important basic industrial raw material, mainly used in chemical industry, pesticide and other fields. In the past, due to insufficient attention to environmental protection and backward treatment technology, many manufacturers discharged phosphorus sludge randomly during the production process, resulting in serious phosphorus pollution in the soil around the factory. These polluted lands are...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 郭沨程奔胡宝伽谢雄吴磊周承瑶李茜张宗仰
Owner 葛洲坝集团生态环保有限公司
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