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Pollution-control synergistic method for in-situ remediation of organically polluted farmland soil

An organic pollution and in-situ remediation technology, applied in the field of soil remediation, can solve the problems of urea peroxide failure, insufficient pollutant degradation ability, and no consideration of the improvement of farmland soil fertility, etc., to achieve enhanced degradation ability, improved degradation, and improved degradation speed effect

Active Publication Date: 2019-03-01
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent "A new technology for repairing soil contaminated by polycyclic aromatic hydrocarbons and organochlorine pesticides in farmland" (publication number: CN104209315A) proposes a method for using tourmaline-assisted microorganisms to restore farmland soil polluted by persistent organic pollutants. The main shortcomings of these technologies While remediating contaminated soil, it does not consider the improvement of farmland soil fertility or is only applicable to site-contaminated soil
However, in this patent, urea hydrogen peroxide is used for in-situ remediation of soil organic matter pollution. Since urea hydrogen peroxide is mostly decomposed to generate oxygen and urea, there are still problems of urea peroxide failure and insufficient degradation of pollutants.

Method used

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  • Pollution-control synergistic method for in-situ remediation of organically polluted farmland soil
  • Pollution-control synergistic method for in-situ remediation of organically polluted farmland soil
  • Pollution-control synergistic method for in-situ remediation of organically polluted farmland soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This example relates to a pollution control and efficiency-enhancing method for in-situ remediation of farmland organically polluted soil, and specifically relates to the effect of modified biochar activated urea peroxide on soil sulfamethoxazole degradation and nitrogen content, and the method includes the following steps :

[0052] (1) Preparation of modified biochar:

[0053] Soak 20g of corn stalks sieved through a 100-mesh sieve in 100ml of 1mol / L FeSO 4 solution, dried after 2h. Place in a crucible for compaction, cover, place in a muffle furnace, heat up to 600°C for pyrolysis for 1 hour, cool to room temperature, deionize and wash 3 times, and dry to obtain the modified biochar material FB of this example.

[0054] (2) Mix the modified biochar with the soil:

[0055] In the artificially added concentration of 10mg / kg sulfamethoxazole-contaminated soil, the modified biochar was added at a ratio of 0.5% to the soil, and the pH of the soil was 6 after adding the...

Embodiment 2

[0061] Example 2 Degradation efficiency of sulfamethoxazole by different pyrolysis temperature modified biochar activated urea peroxide

[0062] This embodiment relates to the degradation efficiency of sulfamethoxazole by the modified biochar activated urea peroxide at different pyrolysis temperatures, including the following steps:

[0063] (1) Preparation of modified biochar:

[0064] Soak 20g of corn stalks shavings through a 100 mesh sieve in 100ml of 1mol / L Fe 2+ Aqueous solution, dry after 2h. Place in a crucible for compaction, cover, place in a muffle furnace, heat up to different temperatures (specifically 200°C, 300°C, 400°C, 500°C, 600°C), pyrolyze for 1 hour, cool to room temperature, and deionize Washing 3 times and drying to obtain various modified biochar materials of this embodiment.

[0065] (2) Mix the modified biochar with the soil:

[0066] In the artificially added concentration of 10mg / kg sulfamethoxazole-contaminated soil, the modified biochar was ...

Embodiment 3

[0070] Example 3 Degradation efficiency of modified biochar activated urea peroxide to sulfamethoxazole under different pH

[0071] The present embodiment relates to the degradation efficiency of modified biochar activated urea peroxide to sulfamethoxazole under different pH, comprising the following steps:

[0072] (1) Preparation of modified biochar:

[0073] Soak 20g of corn stalks shavings through a 100 mesh sieve in 100ml of 1mol / L Fe 2+ Aqueous solution, dry after 2h. Place in a crucible for compaction, cover, place in a muffle furnace, heat up to 600°C for 1 hour, cool to room temperature, wash with deionization three times, and dry to obtain the modified biochar material of this example.

[0074] (2) Mix the modified biochar with the soil:

[0075] In the artificially added concentration of 10mg / kg sulfamethoxazole-contaminated soil, add modified biochar with a soil doping ratio of 0.5%, and adjust the pH of the soil to pH with HCl or NaOH with a concentration of ...

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Abstract

The invention provides a pollution-control synergistic method for in-situ remediation of organically polluted farmland soil and belongs to the fields of environmental protection and solid waste recycling. The method includes: S1) soaking biomass in a ferric solution and / or a ferrous solution, drying and pyrolyzing the biomass, and cooling, washing and drying the biomass to make modified biochar; S2) mixing the modified biochar, urea peroxide solution and the organically polluted farmland soil, and allowing the mixture to stand for degradation. Compared with the prior art, by means of the simultaneous production-remediation, productivity of the farmland soil is enhanced as the pollution-control is achieved; so that the method is a green remediation technology that can maintain the in-situ fertility of the polluted farmland soil. The modified biochar can catalyze the urea peroxide, thus significantly improving the degradation on the organic pollutants in soil.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a pollution control and efficiency enhancement method for in-situ remediation of farmland organically polluted soil. Background technique [0002] In recent years, the spreading trend of my country's farmland soil pollution has developed from toxic and harmful soil pollution to the intersection of toxic and harmful pollution and nitrogen and phosphorus nutrient pollution, forming the coexistence of point source and non-point source pollution. Soil organic pollution caused by high investment in farmland in some economically developed areas has attracted widespread attention, especially the treatment of some new pollutants such as soil antibiotics, hormones, and plasticizers has become a hot spot and difficulty at home and abroad. At present, the research in this field is limited to the partial improvement of traditional soil pollution control technology, mostly the off-si...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 陈钦程沈国清陈璐秦娇龙程治文钱诗颖
Owner SHANGHAI JIAO TONG UNIV
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