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Composition for removing organic pollutants in farmland soil and application thereof

A technology for organic pollutants and compositions, applied in the application, organic fertilizer, fertilizer mixture and other directions, can solve the problems of limited oxidizing ability, inability to remove refractory organic pollutants, etc., achieves a simple preparation method, avoids soil organic matter mineralization, Efficient removal effect

Active Publication Date: 2022-04-26
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pyrophosphate (PP) widely exists in the water environment and soil environment, and can be used as an excellent chelating agent to complex the trivalent manganese Mn(III) in the environment to form a stable trivalent manganese-sodium pyrophosphate complex ( Mn(III)-PP), but due to the limited oxidation ability of Mn(III)-PP in the natural environment, it cannot remove refractory organic pollutants in the environment, thus limiting the application of Mn(III) in soil remediation

Method used

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  • Composition for removing organic pollutants in farmland soil and application thereof
  • Composition for removing organic pollutants in farmland soil and application thereof
  • Composition for removing organic pollutants in farmland soil and application thereof

Examples

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preparation example Construction

[0031] In the present invention, the preparation method of the trivalent manganese-sodium pyrophosphate complex solution preferably comprises the following steps:

[0032] Manganese dioxide, sodium pyrophosphate, sodium sulfite, water and a pH regulator are mixed to make the pH value of the obtained mixture 7.0 to 8.5, and reduction and complexation reactions are carried out to obtain a trivalent manganese-sodium pyrophosphate complex solution.

[0033] In the present invention, the pH regulator is preferably hydrochloric acid; the concentration of the hydrochloric acid is not particularly limited in the present invention, and commercially available hydrochloric acid well known in the art will suffice. In the present invention, the concentration of manganese dioxide in the mixed solution is preferably 0.5 to 5 g / L, more preferably 1 g / L; the concentration of sodium pyrophosphate is preferably 0.1 to 1 mol / L, and the concentration of sodium sulfite is preferably 2.5 to 1 mol / L. ...

Embodiment 1

[0065] Weigh 26.59g of sodium pyrophosphate, dissolve it in 1L of deionized water, place it on a magnetic stirrer to stir and dissolve, use 1M hydrochloric acid to adjust the pH to 8.0, add 1g of manganese dioxide particles, and ultrasonicate the resulting suspension to obtain a dispersion;

[0066] Weigh 630.2 mg of sodium sulfite and dissolve it in the above dispersion, and continue stirring under ultrasonic conditions for 2 hours to obtain a clear pink solution; let it stand for 30 minutes, centrifuge to remove insoluble matter, collect the supernatant to obtain trivalent manganese-pyrophosphate Sodium complex solution, the concentration is 10mmol / L;

[0067] Dry and pulverize the first-soaked soybean meal in the oil press, pass through a 40-mesh sieve, weigh 500g of the obtained first-soaked soybean meal residue, put it in a glass container, add 2L sodium hydroxide (10mM) solution to mix and infiltrate thoroughly, and place it in a dark culture at 40°C. The box was oscilla...

Embodiment 2

[0070] The difference with Example 1 is only: when preparing trivalent manganese-sodium pyrophosphate complex solution, the addition of manganese dioxide particles is 0.5g, and the addition of sodium sulfite is 315mg (that is, the concentration is 2.5mmol / L), obtaining Trivalent manganese-sodium pyrophosphate complex solution, the concentration is 5mmol / L.

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Abstract

The invention provides a composition for removing organic pollutants in farmland soil and application of the composition, and belongs to the technical field of remediation and improvement of the organic pollutants in the farmland soil. The low-cost trivalent manganese-sodium pyrophosphate complex and the soybean meal extracting solution are used as the composition, so that typical organic pollutants in farmland soil can be efficiently removed, and mineralization of soil organic matters and destruction of soil ecological functions can be effectively avoided; meanwhile, after the soybean meal extracting solution is applied as an organic fertilizer, the soil organic matter content can be obviously increased. According to the scheme, the problem of potential secondary pollution in soil remediation is effectively avoided, the method has remarkable oxidation removal capacity on organic pollutants in actual farmland soil, meanwhile, organic matter of the remediated soil is not damaged, the content of the organic matter in the soil is effectively increased, and the method can be widely applied to removal of the organic pollutants in the farmland soil and has a good application prospect. The method is especially suitable for high-organic-matter farmland soil, and a wide application prospect is provided for organic pollution remediation of the high-organic-matter soil.

Description

technical field [0001] The invention relates to the technical field of soil organic pollution restoration and improvement, in particular to a composition for removing farmland soil organic pollutants and its application. Background technique [0002] Soil organic pollution is an important environmental problem at present. In recent years, advanced oxidation technology based on persulfate has been more and more applied to the removal of organic pollutants in soil, groundwater, surface water and sediment. In the application process of advanced oxidation technology, oxidants such as persulfate are activated by heat, ultraviolet light, transition metals, alkalis, etc. to generate sulfate radicals and hydroxyl radicals, which have strong oxidizing ability and are effective in the removal of organic pollutants. Has a better effect. However, advanced oxidation technology is currently widely used in the remediation of contaminated soil on site, but there are some fatal defects for ...

Claims

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Application Information

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IPC IPC(8): C09K17/40C05G3/80C05F5/00B09C1/02B09C1/08C09K101/00C09K109/00
CPCB09C1/02B09C1/08C09K17/40C05G3/80C05F5/006C09K2101/00C09K2109/00Y02A40/20
Inventor 王星皓高娟方国东王玉军
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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