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Particles for comprehensively treating heavy metals in soil and preparation method thereof

A kind of particle treatment and comprehensive treatment technology, applied in the field of soil remediation, can solve the problems of polluted soil, fragile, unable to withstand reclamation, reclamation, etc., to achieve the effect of improving adsorption efficiency, adsorption capacity and adsorption efficiency

Active Publication Date: 2021-08-31
江西源春环保科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned in-situ remediation technology is not effective and sustainable, because struvite is slightly soluble in water and is brittle. When it is used for in-situ remediation of heavy metals, with the continuous dissolution of struvite, the adsorbed and stable heavy metal ions continue to decompose. and re-contaminate the soil; and it is brittle and easily broken, unable to withstand reclamation and reclamation

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  • Particles for comprehensively treating heavy metals in soil and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A granule for comprehensively treating heavy metals in soil, the preparation method of which is as follows:

[0033] (1) Struvite intercalation treatment

[0034] (1) ammonium hydrogen phosphate: ammonium sulfate: the mixture of phosphoric acid mass ratio is 2:1:1 is dissolved in the water of 1.5 times of quality, makes solution A;

[0035] (2) Magnesium sulfate heptahydrate of 0.5 times of the quality of ammonium hydrogen phosphate is dissolved in water of 1 time of the quality of magnesium sulfate heptahydrate to prepare solution B;

[0036] (3) Get the bentonite powder of 10% of the solution A mass, add the solution A, stir and slurry, then steam out 50% of the water by drying under reduced pressure;

[0037] (4) Then add the above-mentioned bentonite to the solution B, stir and slurry, after aging for 6 hours, wash with a small amount of dilute hydrochloric acid, filter and dry under reduced pressure to obtain the bentonite for struvite intercalation;

[0038] (2)...

Embodiment 2

[0046] A granule for comprehensively treating heavy metals in soil, the preparation method of which is as follows:

[0047] (1) Struvite intercalation treatment

[0048] (1) ammonium hydrogen phosphate: ammonium sulfate: the mixture of phosphoric acid mass ratio is 2.5:1:1.1 is dissolved in the water of 1.6 times of quality, makes solution A;

[0049] (2) Magnesium sulfate heptahydrate of 0.5 times of the quality of ammonium hydrogen phosphate is dissolved in water of 1.2 times of the quality of magnesium sulfate heptahydrate to prepare solution B;

[0050] (3) Get the bentonite powder of 11% of the solution A mass, add the solution A, stir and slurry, then steam out 50% of the moisture by drying under reduced pressure;

[0051] (4) Then add the above-mentioned bentonite to the solution B, stir and slurry, after aging for 8 hours, wash with a small amount of dilute hydrochloric acid, filter and dry under reduced pressure to obtain the bentonite for struvite intercalation;

...

Embodiment 3

[0060] A granule for comprehensively treating heavy metals in soil, the preparation method of which is as follows:

[0061] (1) Struvite intercalation treatment

[0062](1) ammonium hydrogen phosphate: ammonium sulfate: the mixture of phosphoric acid mass ratio is 3:2:2 is dissolved in the water of 2 times of quality, makes solution A;

[0063] (2) Magnesium sulfate heptahydrate of 0.6 times of the quality of ammonium hydrogen phosphate is dissolved in water of 1.5 times of the quality of magnesium sulfate heptahydrate to prepare solution B;

[0064] (3) Get bentonite powder with 15% of the solution A mass, add the solution A, stir and slurry, then steam out 60% of the water by drying under reduced pressure;

[0065] (4) Then add the above-mentioned bentonite to the solution B, stir and slurry, after aging for 8 hours, wash with a small amount of dilute hydrochloric acid, filter and dry under reduced pressure to obtain the bentonite for struvite intercalation;

[0066] (2) P...

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Abstract

The invention discloses particles for comprehensively treating heavy metals in soil and a preparation method thereof. Magnesium ammonium phosphate (struvite) is intercalated in bentonite, so that the heavy metal stabilizing effect and the soil improvement effect of the struvite are reserved, and the defects that separation and ex-situ repair cannot be realized due to brittleness and fragility when struvite is directly used are overcome. Meanwhile, peat and activated sludge are added into the heavy metal treatment particles, since most of the peat is organic matters, it is extremely easy for microorganisms in the activated sludge to decompose the peat in the use process of the heavy metal treatment particles, so that the heavy metal treatment particles become a porous structure, and the adsorption efficiency of the heavy metal treatment particles is improved.

Description

technical field [0001] The invention relates to the field of soil restoration, in particular to a particle for comprehensively treating heavy metals in soil and a preparation method thereof. Background technique [0002] With the continuous development of the economy and the increasingly active social production and life, my country's soil is facing serious pollution, and among them, heavy metals are the most prominent among the soil inorganic pollutants, mainly because heavy metals cannot be decomposed by soil microorganisms and are easy to accumulate. Seriously endanger human health. Soil heavy metal pollutants mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc, etc. Among them, mercury, cadmium, and lead are the main pollution sources and are valued by the society. [0003] In the prior art, there is a technique of using struvite (also known as magnesium ammonium phosphate) as a stabilizer to carry out in-situ restoration of he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00
CPCC09K17/40B09C1/00B09C2101/00
Inventor 刘晓峰江寿良刘宗飞聂建求江子恒王丹蕾
Owner 江西源春环保科技有限公司
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