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Remediation Methods of Organic Contaminated Soil

A remediation method and technology for organic pollution, applied in the direction of restoration of polluted soil, etc., to achieve the effects of easy operation, avoiding the introduction of secondary pollution, and low cost

Active Publication Date: 2020-06-30
HUATIAN ENG & TECH CORP MCC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under acidic conditions, although the leaching of ferric iron can be avoided, the excessive ferrous ions in the activation process will inhibit production

Method used

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  • Remediation Methods of Organic Contaminated Soil
  • Remediation Methods of Organic Contaminated Soil
  • Remediation Methods of Organic Contaminated Soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Sulfur-doped nano-carbon activated persulfate remediation of organically polluted soil

[0033] Take 50g of organic-contaminated soil, the organic content of which is 20wt%. Add sulfur doped carbon and persulfate solution. The amount of persulfate added is 3:1 (the mass concentration ratio of persulfate to organic matter in the soil), and the amount of sulfur-doped carbon powder is 15 mg (300 mg of sulfur-doped nano-carbon per kilogram of soil). Add an aqueous solution to the above soil, the amount of water added is enough to cover the soil, and stir for 5 hours at room temperature (25°C) under aeration conditions. After the reaction starts, take a certain amount of mud-water mixture at specific time intervals, and analyze the soil after drying. organic content. Analysis results seefigure 1 , 300min sulfur-doped carbon / persulfate system organic matter removal rate of 95%.

Embodiment 2

[0042] Embodiment 2: with the same experimental procedure of embodiment 1, for the same persulfate consumption (3:1), add different amounts of sulfur-doped carbon, sulfur-doped nano-carbon / persulfate system to the organic matter in soil See Table 1 for removal. The dosage of sulfur-doped carbon was increased from 100mg / kg soil to 5000mg / kg soil. For the sulfur-doped nanocarbon / persulfate system, with the increase of the amount of sulfur-doped carbon, the removal rate of organic matter also increased from 45% to 97%. The increase of sulfur-doped carbon can provide more adsorption sites and active catalytic sites, which is beneficial to the adsorption and degradation of organic matter.

[0043] Table 1 Effect of sulfur-doped nanocarbon / persulfate system on oxidative degradation of soil organic matter sulfur-doped nanocarbon content

[0044]

Embodiment 3

[0045] Example 3: With the same experimental steps as in Example 1, the effects of different additions of persulfate on the removal of organic matter in the soil in the sulfur-doped nanocarbon / persulfate system were analyzed. The mass concentration ratio of persulfate to organic matter was increased from 0.5:1 to 100:1, and the dosage of sulfur-doped nano-carbon was 300mg / kg soil. The analysis results are shown in Table 2, increasing the amount of persulfate, the removal rate of organic matter began to increase. When the amount of persulfate exceeds 3:1, the removal rate of organic matter in the soil is only slightly increased. Considering the removal rate of organic matter and the cost of remediation of soil pollution, the optimal amount of persulfate added is 3:1.

[0046] Table 2 Effect of sulfur-doped nanocarbon / persulfate system on oxidative degradation of organic matter persulfate content in soil

[0047]

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Abstract

The invention discloses a repairing method of an organic contaminated soil. The repairing method of the organic contaminated soil. Sulfur-doped nanocarbon and persulphate are mixed into the organic contaminated soil. Compared with other reported researches of activating persulfate by using a thermal-activation method, a photo-activation method, a transition metal activation method, an iron activation method and the like to decompose organic matters in the soil, the repairing method of the organic contaminated soil has the advantages that the extra cost increased by activating the persulfate isavoided, secondary pollution introduced by activating the persulfate is avoided, and limitation of pH value on a persulfate activation method is avoided. As organic pollutants are decomposed by usingthe sulfur-doped nanocarbon to activate the persulfate under an adsorption-decomposition targeted positioning effect, high efficiency (the usages of a catalyst and persulfate in a sulfur-doped nanocarbon / persulfate system are both lower than those in a like system while the sulfur-doped nanocarbon / persulfate system reaches a similar organic matter removal rate), low cost, easy operation, non toxicity and no secondary pollution are realized. Moreover, compared with a Fe-activated persulfate system, the sulfur-doped nanocarbon / persulfate system have no problems that no iron sludge is leached, divalent iron for inhibiting SO4, <.-> is not available and so on.

Description

technical field [0001] The invention relates to a method for remediating organic polluted soil by activating persulfate with sulfur-doped nano-carbon, which belongs to the field of organic polluted soil remediation and also belongs to the field of carbon materials. Background technique [0002] Organic pollution has become an urgent environmental problem for soil remediation and treatment. Commonly used remediation techniques for soil organic matter pollution include bioremediation, phytoremediation, and chemical oxidation remediation. Bioremediation refers to the use of microbial metabolism to degrade organic matter in the soil. This restoration process is environmentally friendly and low-cost. However, due to the fact that the activity of microorganisms is easily inhibited by the toxicity of pollutants in the soil, the mobility of microorganisms in the soil is poor, and the operation period of the bioremediation method is long, it is difficult for the bioremediation metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 陈志刚高卫民孟溪骆守鹏陶文达
Owner HUATIAN ENG & TECH CORP MCC