Method for remedying soil polluted by organo-chlorine pesticides (OCPs) on basis of solubilization, elution and microorganism strengthening effects of surface active agent

A surfactant and microbial remediation technology, applied in the field of organic contaminated soil remediation, can solve problems such as increasing the amount of surfactants, and achieve the effects of improving community structure, increasing quantity and activity, and promoting microbial degradation.

Active Publication Date: 2015-09-23
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct spraying of surfactants can only restore the surface 10cm of soil, and repeated spraying of surfactants is required, which not only increases the amount of surfactants, but also easily causes ecological risks to microbial communities, etc.

Method used

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  • Method for remedying soil polluted by organo-chlorine pesticides (OCPs) on basis of solubilization, elution and microorganism strengthening effects of surface active agent
  • Method for remedying soil polluted by organo-chlorine pesticides (OCPs) on basis of solubilization, elution and microorganism strengthening effects of surface active agent
  • Method for remedying soil polluted by organo-chlorine pesticides (OCPs) on basis of solubilization, elution and microorganism strengthening effects of surface active agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare 400 mg / L rhamnolipid-inorganic salt solution, adjust its ionic strength to 5.0 mg / L, pH to 7.0, sterilize at 121°C for 30 minutes, and after cooling, measure 5L of rhamnolipid solution and put it in In the beaker containing the soil to be eluted, place it under a six-joint stirrer to stir; among them, the amount of rhamnolipid required for 1000 g of soil sample is 2 g.

[0023] Stir for 30 min, centrifuge the eluted soil, evenly select 5 g of the eluted soil sample, and after freeze-drying, the measured OCPs elution efficiency is 89.0% (eg Figure 4 shown), in which DDE and DDT in OCPs did not meet soil environmental quality standards (such as Figure 5 shown).

[0024]The content of rhamnolipid in the supernatant was determined, and the concentration of rhamnolipid in the soil was washed with water to a concentration range of 10-50 mg / kg.

[0025] The soil after the first wash was piled up on the open space with ventilation in the overlying shed, and water wa...

Embodiment 2

[0027] Prepare 1000 mg / L SDBS-inorganic salt solution, adjust its ionic strength to 5.0 mg / L, pH to 7.0, sterilize at 121 °C for 30 minutes, and after cooling, measure 5 L SDBS solution into the soil to be eluted In the beaker of 1000 g soil sample, the required amount of SDBS is 5 g.

[0028] Stir for 30 min, centrifuge the eluted soil, evenly select 5 g of the eluted soil sample, freeze-dry it, and determine the total OCPs elution efficiency to be 89.3% (eg Figure 4 shown), in which neither DDE nor DDT in OCPs met soil environmental quality standards (e.g. Figure 5 shown).

[0029] The SDBS content in the supernatant was determined, and the SDBS concentration in the soil was washed with water to a concentration range of 10-50 mg / kg.

[0030] The soil after the first wash was piled up on the open space with ventilation in the overlying shed, and water was sprayed as needed to keep the soil moisture content at 30%, and the soil was turned every 2 weeks. At the end of each...

Embodiment 3

[0032] Prepare 800 mg / L Tween 80-inorganic salt solution, adjust its ionic strength to 5.0 mg / L, pH to 7.0, sterilize at 121°C for 30 minutes, and after cooling, measure 5 L of Tween 80 solution and put it into a container to be washed In the de-soiled beaker, place it under a six-joint stirrer to stir; among them, the amount of Tween 80 required for 1000 g of soil sample is 4 g.

[0033] Stir for 30 min, centrifuge the eluted soil, evenly select 5 g of the eluted soil sample, and freeze-dry it to determine the total OCPs elution efficiency of 88.2% (eg Figure 4 shown), in which neither DDE nor DDT in OCPs meet the requirements of environmental quality standards (such as Figure 5 shown).

[0034] The content of Tween 80 in the supernatant was determined, and the concentration of Tween 80 in the soil was washed with water to a concentration range of 10-50 mg / kg.

[0035] The soil after the first wash was piled up on the open space with ventilation in the overlying shed, and...

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Abstract

The invention discloses a method for remedying soil polluted by organo-chlorine pesticides (OCPs) on the basis of the solubilization, elution and microorganism strengthening effects of a surface active agent. The method includes the steps that firstly, soil is cleaned once on the basis of the solubilization and elution effects of the surface active agent so that over 85% of OCPs in the soil can be removed; the cleaned soil is directly stacked at the ventilated location of a work shed, the residual surface active agent is used for improving the community structure and activity of indigenous microorganisms and strengthening the indigenous microorganisms to degrade residual OCPs in the soil, and finally the soil meets the environmental safety standard. The method is easy to implement, economical, efficient, environmentally friendly and safe, and can be applied to remediation of OCPs organic polluted sites / soil on a large scale.

Description

technical field [0001] The invention relates to the technical field of organic polluted soil remediation, in particular to a method for remediating organic pesticide-contaminated sites / soils using a single or mixed surfactant solubilization elution-enhanced indigenous microbial degradation integration technology. Background technique [0002] With the acceleration of urbanization and the adjustment of urban land functions, a large number of industrial polluting enterprises have moved out, leaving about 30 high-risk industrial pollution sites such as pesticides and chemicals. If they are directly used as residential, school or public facility land, it will definitely affect The crowd is healthy. my country is a big country in the production and use of pesticides. At the same time, the level of pesticide production technology in our country is relatively backward, the phenomenon of dripping and leakage in the production process is relatively serious, and the soil pollution in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/02
Inventor 朱利中王凌文陆海楠李峰
Owner ZHEJIANG UNIV
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