Method for restoring organophosphorus pesticide contaminated soil

A technology for organophosphorus pesticides and polluted soil, applied in the field of remediation of organophosphorus pesticide-contaminated soil, can solve problems such as unsatisfactory remediation of organophosphorus pesticide-contaminated soil, and achieve the effects of accelerated reaction participation, strong engineering practicability, and accelerated heterogeneous migration.

Inactive Publication Date: 2016-04-13
天津环科立嘉环境修复科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of unsatisfactory remediation of organophosphorus pesticide-contaminated soil in the prior art, and propose a new technology for remediation of organophosphorus pesticide-contaminated soil combined with chemical oxidation

Method used

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  • Method for restoring organophosphorus pesticide contaminated soil
  • Method for restoring organophosphorus pesticide contaminated soil
  • Method for restoring organophosphorus pesticide contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Take 500g of soil polluted by organophosphorus pesticides in a pesticide factory in Tianjin after screening (concentration is 3342mg / Kg), add 5g of solid sodium hydroxide, and stir evenly;

[0039] 2. Measure 200mL of polyethylene glycol aqueous solution with a mass fraction of 1%, add it to the soil in the above step and stir evenly, the pH is 9-10;

[0040] 3. Seal the soil after dosing according to the above steps for 3 days, and keep the soil moisture during storage and maintenance;

[0041] 4. Add 10g of activated persulfate to the soil after conditioning and decomposing and stir well;

[0042] 5. Add 10mL sulfuric acid aqueous solution with a volume fraction of 1:1, the pH is 5-6, while stirring rapidly;

[0043] 6. Seal and stockpile the soil after repairing according to the above steps, keep the soil moisture for 1 day and send it for inspection.

[0044]Send inspection, detection method is as follows (other embodiments are connected with this detection met...

Embodiment 2

[0048] 1. Take 500g of soil polluted by organophosphorus pesticides in a pesticide factory in Tianjin after screening (concentration is 6782mg / Kg), add 8g of solid sodium hydroxide, and stir evenly;

[0049] 2. Measure 180mL of polyethylene glycol aqueous solution with a mass fraction of 2%, add it to the soil in the above step and stir evenly, the pH is 10-11;

[0050] 3. Seal the soil after dosing according to the above steps for 2 days, and keep the soil moisture during storage and maintenance;

[0051] 4. Add 15g of solid potassium ferrate to the above-mentioned conditioned and heaped soil and stir well;

[0052] 5. Add 38mL sulfuric acid aqueous solution with a volume fraction of 1:1, the pH is 3-4, while stirring rapidly;

[0053] 6. Seal and stockpile the soil after repairing according to the above steps, keep the soil moisture for 2 days and send it for inspection.

[0054] The results showed that the concentration of organophosphorus pesticides in the repaired soil ...

Embodiment 3

[0056] 1. Take 500g of soil polluted by organophosphorus pesticides in a pesticide factory in Tianjin after screening (concentration is 3478mg / Kg), add 8g of solid potassium hydroxide, and stir evenly;

[0057] 2. Measure 50mL of polyethylene glycol aqueous solution with a mass fraction of 5%, add it to the soil in the above step and stir evenly, the pH is 10-11;

[0058] 3. Seal the soil after dosing according to the above steps for 3 days, and keep the soil moisture during storage and maintenance;

[0059] 4. Add 10g of solid potassium permanganate to the above-mentioned soil after conditioning and decomposing, and stir well;

[0060] 5. Add 34mL sulfuric acid aqueous solution with a volume fraction of 1:1, the pH is 3-4, while stirring rapidly;

[0061] 6. Seal and stockpile the soil after repairing according to the above steps, keep the soil moisture for 2 days and send it for inspection.

[0062] The results show that the concentration of organophosphorus pesticides in ...

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Abstract

The invention belongs to the field of soil improvement, and specifically relates to a method for restoring organophosphorus pesticide contaminated soil. The method comprises the two phases of conditioning and stacking-decomposing, and chemical oxidation, wherein the phase of conditioning and stacking-decomposing comprises the following steps: 1) adding a strong-base medicament; 2) adding surfactant aqueous solution into soil prepared in the step 1); and 3) hermetically stacking the soil in the step 2) for 2-7 days; and the phase of chemical oxidation comprises the following steps: 4) adding a strong oxidant into the soil obtained in the phase of conditioning and stacking-decomposing; 5) preparing a strong acid into aqueous solution and adding the aqueous solution into the soil in the step 4), and rapidly stirring simultaneously to enable the soil to be weak-acidic finally; and 6) hermetically stacking the soil subjected to the adequate stirring treatment in the step 5), keeping the humidity of the soil and maintaining for 1-3 days. The restoration process of combining conditioning and stacking-decomposing with chemical oxidation, which is disclosed by the invention, is more stable and thorough compared with the method of restoring organic contaminated soil through simply and directly adopting chemical oxidation.

Description

technical field [0001] The invention belongs to the field of soil improvement, and in particular relates to a method for repairing soil polluted by organophosphorus pesticides. Background technique [0002] As we all know, in the past few decades, due to factors such as industrial technology, urban planning, and industrial layout, a large number of old and heavily polluting enterprises were forced to close down, including a large number of large state-owned enterprises. Coupled with the rapid advancement of urbanization in my country in recent years, some polluting enterprises have gradually moved from the suburbs to the hinterland of the city, facing the heavy task of demolition. These old enterprises that have been shut down and the locations of polluting enterprises that have been demolished or will be demolished need to be redeveloped to meet the needs of urbanization. However, these areas (commonly referred to as brownfields in foreign countries) are often highly pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 商晓甫马建立马云鹏霍宁冯磊游洋洋乔鹏张良运张诚周金倩郭红王岳其他发明人请求不公开姓名
Owner 天津环科立嘉环境修复科技有限公司
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