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Remediation method for organic contaminated soil

A technology of organic pollution and remediation method, applied in the field of soil remediation, can solve problems affecting the soil ecological environment, secondary pollution, etc., and achieve the effect of thorough remediation and elimination of organic pollutants

Inactive Publication Date: 2018-11-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies have shown that titanium dioxide has phototoxicity, which affects the soil ecological environment and may cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for remediating organically polluted soil, the specific steps are:

[0018] (1) Clean the corn stalks and dry them in the oven for 2 hours, then cut the stalks into pieces no longer than 1 cm, place them in a tube furnace, and crack them at 300°C under a nitrogen atmosphere for 3 hours , ground after cooling to obtain biochar powder with a particle size of 2mm;

[0019] (2) Put the organic polluted soil, biochar powder and sodium persulfate in a mass ratio of 100:2:3, put them in a mixer and mix them well, spray water on the polluted soil every day, and control the moisture content of the polluted soil at 30 %, aged for 30 days.

[0020] After the remediation of the organic contaminated soil described in the present embodiment, gas chromatography and high performance liquid chromatography were used to analyze and obtain wherein the contents of the organic matter toluene, xylene, naphthalene, pyrene, benzo(a)pyrene, anthracene, and phenanthrene were respectivel...

Embodiment 2

[0022] A kind of remediation method of organic polluted soil:

[0023] (1) Clean and dry the leaves, then place them in an oven to dry for 2 hours, then cut the leaves into pieces no longer than 1 cm, place them in a tube furnace, and crack them at 400°C under a nitrogen atmosphere for 3 hours at high temperature. Grinding after cooling to obtain biochar powder with a particle size of 2mm;

[0024] (2) Put the organic polluted soil, biochar powder and potassium persulfate in a mass ratio of 100:0.5:1, put them in the mixer and mix them thoroughly, spray water on the polluted soil every day, and control the moisture content of the polluted soil at 20 %, aged for 35 days.

[0025] After the remediation of the organic contaminated soil described in the present embodiment, gas chromatography and high performance liquid chromatography were used to analyze and obtain wherein the contents of the organic matter toluene, xylene, naphthalene, pyrene, benzo(a)pyrene, anthracene, and phe...

Embodiment 3

[0027] A kind of remediation method of organic polluted soil:

[0028] (1) Clean the fruit shell and dry it, then dry it in an oven for 2 hours, then cut the fruit shell into pieces no longer than 1cm, place it in a tube furnace, and crack it at 500°C under a nitrogen atmosphere 3h, after cooling, grind to obtain biochar powder with a particle size of 2mm;

[0029] (2) Put the organic polluted soil, biochar powder and ammonium persulfate in a mass ratio of 100:3:5, and put them in a mixer to mix well, spray water on the polluted soil every day, and control the moisture content of the polluted soil at 50 %, aging for 40 days.

[0030] After the remediation of the organic contaminated soil described in this example, gas chromatography and high performance liquid chromatography were used to analyze and obtain the contents of the organic matter toluene, xylene, naphthalene, pyrene, benzo(a)pyrene, anthracene, and phenanthrene respectively as 93mg / kg, 82mg / kg, 39mg / kg, 53mg / kg, 2...

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Abstract

The invention provides a remediation method for organic contaminated soil. The remediation method comprises the following steps of: mixing the organic contaminated soil, persulfate and bio-carbon powder to obtain pre-remediated soil; and ageing the pre-remediated soil for 30-40 days to remediate the organic contaminated soil. The remediation method can effectively eliminate the organic pollutantsin soil, further can supplement organic carbon for the soil, reduces toxicity of the contaminated soil, remediates soil fertility, does not generate secondary pollution, realizes efficient, green, safe and complete remediation for the organic contaminated soil, and provides a novel way for efficient and safe remediation for the organic contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, in particular to a biochar-persulfate combined method for remediating organic polluted soil. Background technique [0002] Soil pollution has become a worldwide environmental problem. With the acceleration of industrialization, the proportion of organic polluted soil is getting higher and higher. According to statistics, my country's polluted cultivated land has accounted for more than 20% of the country's cultivated land, of which organically polluted farmland is as high as 36 million hm 2 . Severe soil pollution has endangered food safety, human health, ecological security and sustainable agricultural development, and even affected foreign trade of agricultural products and the interests of environmental diplomacy. Therefore, the treatment of polluted soil is urgent. [0003] Biochar is a high-carbon solid residue, mainly composed of aromatic hydrocarbons and elemental carbon or has...

Claims

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Application Information

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IPC IPC(8): B09C1/08A01B77/00
CPCA01B77/00B09C1/08
Inventor 李英杰石凤丽房岐刘相良田森林赵群黄建洪胡学伟宁平
Owner KUNMING UNIV OF SCI & TECH
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