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Method for repairing soil polluted by organic pollutants

A technology for organic pollutants and soil pollution, applied in the restoration of polluted soil, etc., can solve the problems of limited organic pollution soil remediation treatment, small contact area of ​​organic waste, poor pollutant removal effect, etc., achieving remarkable adsorption effect, Enhancement effect, short cycle effect

Inactive Publication Date: 2019-01-18
JINAN CHENGSHIZHIYI ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The natural purification method and biological method are mainly used in sites with low pollutant concentration, and the restoration period is long, which is not applicable to the urban land shortage
The groundwater pumping treatment method is affected by the solubility of pollutants, and the removal effect of pollutants with lower solubility is not good
The steam extraction method is affected by the ambient temperature, saturated vapor pressure, soil moisture and soil permeability, and is often used for the removal of volatile or semi-volatile organic compounds in unsaturated contaminated soil; the application of chemical injection and chemical leaching depends on Due to the physical and chemical properties of the soil, it is suitable for porous and permeable soils. For soils with low osmotic pressure and large heterogeneity, the chemical treatment effect is not good. In addition, the leaching agent is easily absorbed by the soil, resulting in enhanced soil toxicity and reduced microbial activity.
[0004] For some plots with low pollution degree and small pollution range, most of the existing technologies adopt the excavation disposal method, combined with the chemical oxidation method to carry out harmless treatment of the excavated soil, but the existing oxidants, when used alone, have The oxidation efficiency is low, the oxidation is not complete, and the contact area with organic waste is small, so the remediation treatment of organic polluted soil is greatly limited

Method used

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  • Method for repairing soil polluted by organic pollutants
  • Method for repairing soil polluted by organic pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for remediating soil pollution by organic pollutants, comprising the following steps:

[0023] (1) After the polluted soil is cleared and excavated, impurities are screened out, the polluted soil is pulverized and passed through a 15mm sieve, and then compressed air is introduced into the polluted soil, and after 5 minutes of air blowing treatment, the pressure of the compressed air is 300kPa, and then Stir 5% activator of polluted soil quality wherein, stir, and wherein activator adopts following method to make: by weight, 13 parts of cerium chloride, 10 parts of yttrium chloride are added to 250 parts of water, then to Wherein continue to add 32 parts of sodium lauryl salicylate, the temperature of the mixture is raised to 75 DEG C, after heat preservation treatment for 2 hours, the activator is obtained;

[0024] (2) Then add oxidizing agent, sodium hydroxide, adsorbent in polluted soil, wherein every kilogram of polluted soil adds the oxidizing agent of 8g,...

Embodiment 2

[0026] A method for remediating soil pollution by organic pollutants, comprising the following steps:

[0027] (1) After the polluted soil is cleared and excavated, impurities are screened out, the polluted soil is pulverized and passed through a 15mm sieve, and then compressed air is introduced into the polluted soil, and after 8 minutes of air blowing treatment, the pressure of the compressed air is 350kPa, and then Stir 8% activator of polluted soil quality wherein, stir, and wherein activator adopts following method to make: by weight, 15 parts of cerium chloride, 13 parts of yttrium chloride are added to 280 parts of water, then to Wherein continue to add 34 parts of sodium lauryl salicylate, the temperature of the mixture is raised to 78 DEG C, after heat preservation treatment for 2.5 hours, the activator is obtained;

[0028] (2) Then add oxidizing agent, sodium hydroxide, adsorbent in polluted soil, wherein every kilogram of polluted soil adds the oxidizing agent of 9...

Embodiment 3

[0030] A method for remediating soil pollution by organic pollutants, comprising the following steps:

[0031] (1) After the polluted soil is cleared and excavated, impurities are screened out, the polluted soil is crushed and passed through a 15mm sieve, and then compressed air is introduced into the polluted soil, and after 10 minutes of air blowing treatment, the pressure of the compressed air is 400kPa, and then Stir 10% activator of polluted soil quality wherein, stir, and wherein activator adopts following method to make: by weight, 16 parts of cerium chloride, 15 parts of yttrium chloride are added to 300 parts of water, then to Wherein continue to add 36 parts of sodium lauryl salicylate, the temperature of the mixture is raised to 80 DEG C, after heat preservation treatment for 3 hours, the activator is obtained;

[0032] (2) Then add oxidizing agent, sodium hydroxide, adsorbent in polluted soil, wherein every kilogram of polluted soil adds the oxidant of 10g, every k...

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Abstract

The invention discloses a method for repairing soil polluted by organic pollutants. The method comprises the following operating steps that (1) after the polluted soil is cleaned and dug, impurities are filtered out, then compressed air is led into the polluted soil, air blowing treatment is conducted for 5-10 min, and then an activator is stirred into the polluted soil and stirred evenly; and (2)then an oxidizing agent, sodium hydroxide and an adsorbent are added into the polluted soil, and repairing treatment is conducted for 5-7 days, wherein the adsorbent is made by adopting the followingmethod that montmorillonite is added into a buffer solution with the pH being 8-9, after even ultrasonic dispersion, dopamine is added into the buffer solution, a reaction is conducted for 3-4 hours,then filtering is conducted to obtain precipitation, and after the precipitation is dried, the adsorbent is obtained. According to the method for repairing the soil polluted by the organic pollutants, operation is easy, the cost is low, the repairing efficiency is high, the period is short, and the method is suitable for repairing the small-area soil with serious organic pollution.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating soil pollution by organic pollutants. Background technique [0002] With the rapid development of my country's industrialization, the soil environment is constantly being harmed by various pollutions. At the same time, the demand for remediation and treatment of polluted soil will increase. Organic pollutants are one of the main pollutants ubiquitous in soil, mainly including organic pesticides, phenols, synthetic detergents, and harmful microorganisms brought by urban sewage, sludge and fertilization. The above-mentioned pollutants can enter the soil system through a variety of channels such as large-scale application of chemical fertilizers and pesticides, sewage irrigation, atmospheric deposition, etc., and change the physical and chemical properties of the soil, destroy the local ecosystem, and have indirect and direct toxic effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/005B09C1/08
Inventor 温明振
Owner JINAN CHENGSHIZHIYI ENVIRONMENTAL PROTECTION SCI & TECH CO LTD