Preparation method of soil remediation agent based on phosphorus recovery product and soil remediation method

A technology of soil remediation and phosphorus recovery, applied in the field of soil remediation, can solve problems such as adverse effects on soil structure and soil acidification, and achieve the effect of improving soil heavy metal pollution, reducing activity and promoting release

Inactive Publication Date: 2021-07-23
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of soluble phosphates (such as phosphoric acid, diammonium hydrogen phosphate, etc.) will cause soil acidification, and excessive phosphorus leaching may become a potential source of surface water eutrophication
The use of insoluble phosphates (such as tricalcium phosphate and apatite, etc.) will bring about the precipitation of a large amount of apatite minerals, which will adversely affect the soil structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing soil remediation agent based on waste water phosphorus recovery product, comprising:

[0035] When treating phosphorus-containing wastewater, add nitrogen source and magnesium source to it, so that the composition ratio of each element is N:P:Mg=10:1:1, use NaOH solution to adjust the pH to 9, and the precipitation reaction ends after 30 minutes. After 30 minutes, the precipitate was collected and dried for 12 hours, and kept for future use. The wastewater phosphorus recovery product prepared by this process may be magnesium ammonium phosphate with higher purity.

[0036] A repairing method for repairing heavy metal-contaminated soil using the repairing agent as described above, comprising:

[0037] Remediate the contaminated soil containing heavy metal chromium and lead, adjust the water content of the heavy metal contaminated soil to 40%, use alkaline solution to adjust the pH to 7.1, mix the above phosphorus recovery products into the heavy me...

Embodiment 2

[0041]A method for preparing soil remediation agent based on waste water phosphorus recovery product, comprising:

[0042] When treating phosphorus-containing wastewater, add nitrogen source, magnesium source and calcium source to it, so that the composition ratio of each element is N:P:Mg:Ca=10:1:1:0.5, use NaOH solution to adjust the pH to 9, and the precipitation reaction End after 30 minutes, let it stand for 30 minutes, collect the precipitate, and dry it for 12 hours, and save it for future use. The wastewater phosphorus recovery product prepared by this process may consist of magnesium ammonium phosphate and hydroxyapatite.

[0043] A repairing method for repairing heavy metal-contaminated soil using the repairing agent as described above, comprising:

[0044] Remediate the contaminated soil containing heavy metal chromium and lead, adjust the water content of the heavy metal contaminated soil to 40%, use alkaline solution to adjust the pH to 7.1, mix the above phospho...

Embodiment 3

[0048] A method for preparing soil remediation agent based on waste water phosphorus recovery product, comprising:

[0049] When treating phosphorus-containing wastewater, add magnesium source and potassium source to it, so that the composition ratio of each element is K:P:Mg=10:1:1, use NaOH solution to adjust the pH to 9, and the precipitation reaction ends after 30 minutes. After 30 minutes, the precipitate was collected and dried for 12 hours, and kept for future use. The wastewater phosphorus recovery product prepared by this process may be composed of potassium magnesium phosphate with higher purity.

[0050] A repairing method for repairing heavy metal-contaminated soil using the repairing agent as described above, comprising:

[0051] Remediate the contaminated soil containing heavy metal chromium and lead, adjust the water content of the heavy metal contaminated soil to 40%, use alkaline solution to adjust the pH to 7.1, mix the above phosphorus recovery products int...

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PUM

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Abstract

The invention discloses a preparation method of a soil remediation agent based on a phosphorus recovery product and a soil remediation method. The soil remediation method comprises the following steps that a, adding a nitrogen source and a magnesium source or a potassium source and the magnesium source into phosphorus-containing wastewater, adjusting the pH value of the wastewater to be higher than 7, colecting precipitates after precipitation reaction, and obtaining the phosphorus recovery product after drying; wherein the molar ratio of N or K : P : Mg is 10: 1: 1; and b, doping the phosphorus recovery product and plant ash into water-containing heavy metal contaminated soil, uniformly mixing, and completing soil remediation after a heavy metal passivation process. The phosphorus recovery product is used as a soil heavy metal passivator, the cation exchange capacity of the passivator in polluted soil is increased, release of phosphorus is promoted, the activity of heavy metal in the soil is reduced, meanwhile, the phosphorus recovery product has low solubility, soluble phosphate is replaced by the phosphorus recovery product, the problem of soil acidification during application can be reduced, phosphorus leaching can be reduced, and eutrophication of a surface water body is reduced.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for preparing a soil remediation agent based on phosphorus recovery products and a soil remediation method. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace harmful elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Heavy metal pollution in soil usually comes from the waste water discharged by mining, smelting and other industrial and mining enterprises, improper disposal of waste residues and farmland irrigation with substandard waste water. Through surface runoff, leaching and plant absorption, it is enriched to the human body through the food chain, endangering health. Heavy metal pollution in soil has the characteristics of hidden, long-term and irreversible, which has caused ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 李兵黄跃飞韩京成武晓峰
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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