Method for repairing DDTs contaminated soil by using composite lotion, and application thereof

A technology for polluted soil and compound lotion, applied in the field of environmental chemistry, can solve the problems of limiting the availability of plants and the speed of phytoremediation, unfavorable DDTs absorption and enrichment, unfavorable plant degradation, etc., to reduce the risk of secondary pollution, Eco-environmentally safe and friendly, easily biodegradable effect

Inactive Publication Date: 2021-06-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The residual concentration of DDTs is an important factor affecting the effect of phytoremediation. Low concentration is not conducive to the absorption and enrichment of DDTs by plants. High concentration will cause toxicity and is not conducive to the degradation of plants. Both of them can reduce the effect of phytoremediation.
[0008] Although the use of phytoremediation technology to treat organically polluted soil has the characteristics of easy operation, low cost, and no secondary pollution, DDTs with strong hydrophobicity are easily adsorbed by the soil, and the slow release from the soil solid phase to the soil solution severely limits its use. The degree of plant availability and the speed of phytoremediation, so increasing the solubility of DDTs in water and improving their microbial / plant availability has become the key to improving the efficiency of phytoremediation of DDTs contaminated soil
In recent years, research hotspots mainly focus on the use of surfactants combined with microbial remediation technology to remediate organically polluted soils, or the use of single surfactants or surfactants to enhance the efficiency of phytoremediation. However, the use of easily degradable chemical surfactants combined with other There are few reports on the ability of surfactants to enhance the ability of plants to remediate DDTs-contaminated soil

Method used

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  • Method for repairing DDTs contaminated soil by using composite lotion, and application thereof
  • Method for repairing DDTs contaminated soil by using composite lotion, and application thereof
  • Method for repairing DDTs contaminated soil by using composite lotion, and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Set the comparative experiment of three different processing methods, the experimental data is detailed in the instructions figure 1 :

[0041] CK: equivalent pollution level, no plants, no synergistic composite lotion samples;

[0042] T1: equivalent pollution level, plant, no synergistic composite lotion sample;

[0043] T2: Samples of a certain amount of increased composite lotion regularly, and the specific experimental steps are shown below.

[0044] DDTS pollution concentration of 2.38 mg / kg of contaminated soil 800g (black soil), after sieving, the soil water content is about 60% of the maximum water in the field;

[0045]Fertilizers are applied to standards 35 mg / kg, phosphorus 25 mg / kg, potassium 30 mg / kg, supplemented a nutrient solution every two weeks, avoiding the possibility of raw stress in the growth process of the root microbial growth to ensure that plants can be in mineral nutrients Growing in a sufficient environment;

[0046] The germination and...

Embodiment 2

[0049] Set the comparative experiment of three different processing methods, the experimental data is detailed in the instructions figure 2 :

[0050] CK: equivalent pollution level, no plants, no synergistic composite lotion samples;

[0051] T1: equivalent pollution level, plant, no synergistic composite lotion sample;

[0052] T2: Samples of a certain amount of increased composite lotion regularly, and the specific experimental steps are shown below.

[0053] Pollution soil (sand) of DDTS pollution concentration is 2.47 mg / kg 800g (sand) After sieving, the soil moisture content is about 60% of the maximum water in the field;

[0054] Fertilizers are applied to standards 35 mg / kg, phosphorus 25 mg / kg, potassium 30 mg / kg, supplemented a nutrient solution every two weeks, avoiding the possibility of raw stress in the growth process of the root microbial growth to ensure that plants can be in mineral nutrients Growing in a sufficient environment;

[0055] The germination an...

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Abstract

The invention relates to a method for repairing DDTs contaminated soil by using a composite lotion, and application thereof, and belongs to the technical field of environmental chemistry. According to the invention, the absorption of plants to DDTs and the degradation of the plants in rhizosphere soil are improved by utilizing the solubilizing effect of the synergistic composite lotion compounded by the surfactant Tween80 and the green organic solvent ethyl lactate on strong-hydrophobicity DDTs in a manner of promoting the plants to repair the DDTs polluted soil through the synergistic composite lotion; and the synergistic composite lotion is regularly applied to soil in a spraying mode, meanwhile, the moisture content of the soil is strictly controlled, the percolation phenomenon is avoided, plant growth is facilitated, mixing, conveying and uniform distribution of effective components in the synergistic composite lotion are facilitated, the risk of secondary pollution is reduced, and the remediation efficiency is improved. The method has the advantages of being economical, efficient, easy to operate, wide in applicable soil type, capable of achieving in-situ remediation, small in influence on the original environment, capable of reducing the risk of secondary pollution and beneficial to soil recycling.

Description

Technical field [0001] The present invention belongs to the field of environmental chemistry, and in particular, the method involving a composite lotion repair DDTS contaminated soil and its application. Background technique [0002] DDT (DDT), is chemically named 2,2-double (chlorophenyl) -1,1,1-trichloroethane (2,2-bis (4-chlorophenyl) -1 ,1, 1-trichloroethane) , Molecular formula: c 14 Hide 9 CL 5 . DDTS is a common name of the DDT homogeneous and homologues, including P, P'-DDT, P, P, P, P, P, P, P,, etc. As a typical representative of organochlorine pesticides, DDTS has been widely used to control agricultural pests and malaria diseases, which are widely used around the world. Although it has been disabled for many years, due to its stability and strong hydrophobicity, the DDT and its degradation products have been long-lasting in the soil, and the half-life can reach a few years to more than ten years. Over the years, these pesticide residues have been seriously harmful due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10B09C1/02
CPCB09C1/02B09C1/08B09C1/105B09C2101/00
Inventor 陈薇薇郭平康春莉杨平
Owner JILIN UNIV
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