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Ex-situ intensified washing method for chlorpyrifos contaminated soil

A technology of polluted soil and pyrithione, which is applied in the field of contaminated soil leaching, can solve problems such as limited leaching effect, failure to meet the basic principles of contaminated soil remediation, and secondary pollution, achieving strong practical application potential and low cost , The effect of high washing efficiency

Inactive Publication Date: 2014-09-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these eluents will cause secondary pollution, which does not meet the basic principles of contaminated soil remediation.
Generally speaking, water is the most common, cheapest, safest, and most potential leaching solution for polluted soil. However, according to the principle of similar compatibility in chemical theory, the leaching effect of water on pesticides limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The first step, collect 0-20cm uncontaminated loess surface sample 20g, add 200mL sewage treatment plant reclaimed water in the Erlenmeyer flask with stopper that described loess surface sample is housed, under ultrasonic auxiliary stirring (ultrasonic power is 100W, stirring rate 120r / min) and heated for 4 hours, the supernatant obtained after centrifugation (5000r / min, 5min) after the extraction is the loess extract, and the extraction temperature is 25°C;

[0027] In the second step, 5 g of crushed straw was weighed and added to an Erlenmeyer flask containing 500 mL of loess extract, sealed with a perforated plastic wrap, and the dissolved organic matter released during the humification of the straw was extracted. The humification time was 60 days. The humification temperature is 45°C. After the humification process is completed, the straw humification solution is obtained by centrifugation (5000r / min, 5min) and filtration with a 0.45μm filter membrane;

[0028] The ...

Embodiment 2

[0038] The first step, collect 0-20cm uncontaminated loess surface sample 15g, add 200mL sewage treatment plant reclaimed water in the Erlenmeyer flask with stopper that described loess surface sample is housed, under ultrasonic auxiliary stirring (ultrasonic power is 100W, stirring rate 100r / min) and heated for 4 hours, the supernatant obtained after centrifugation (5000r / min, 5min) after the extraction is the loess extract, and the extraction temperature is 25°C;

[0039] In the second step, 5 g of crushed straw was weighed and added to a conical flask containing 400 mL of loess extract, sealed with a perforated plastic wrap, and the dissolved organic matter released during the humification of the straw was extracted, and the humification time was 60 days. The humification temperature is 45°C. After the humification process is completed, the straw humification solution is obtained by centrifugation (5000r / min, 5min) and filtration with a 0.45μm filter membrane;

[0040]The 3...

Embodiment 3

[0043] The first step, collect 0-20cm uncontaminated loess surface sample 10g, add 200mL sewage treatment plant reclaimed water in the Erlenmeyer flask with stopper that described loess surface sample is housed, under ultrasonic auxiliary stirring (ultrasonic power is 100W, stirring rate 80r / min) and heated for 4 hours, the supernatant obtained after centrifugation (5000r / min, 5min) after the extraction is the loess extract, and the extraction temperature is 25°C;

[0044] In the second step, 5 g of pulverized straw was weighed and added to an Erlenmeyer flask containing 300 mL of loess extract, sealed with a perforated plastic wrap, and the dissolved organic matter released during the humification of the straw was extracted, and the humification time was 60 days. The humification temperature is 45°C. After the humification process is completed, the straw humification solution is obtained by centrifugation (5000r / min, 5min) and filtration with a 0.45μm filter membrane;

[0045...

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Abstract

The invention provides an ex-situ intensified washing method for chlorpyrifos contaminated soil. The method comprises the following steps: adding 200mL of reclaimed water in a sewage treatment plant into a conical flask with a stopper filled with uncontaminated loess, and extracting a loess extracting solution under ultrasonic assisted stirring and heating conditions; weighing 5g of crushed straws and adding the crushed straws into the conical flask filled with the loess extracting solution, sealing and culturing by using a preservative film with pores; centrifuging after the humification process is ended, filtering through a filter membrane being 0.45 micrometers so as to obtain a straw humification solution; and performing intensified washing on the chlorpyrifos contaminated soil by taking a mixed solution of the loess extracting solution prepared in the first step and the straw humification solution prepared in the second step as a washing solution. According to the method, the defects in the prior art are overcome, the process is simple, the cost is low, the washing solution is natural and environmentally friendly, secondary pollution in the washing process is avoided, the washing efficiency is high, and the method has high actual application potential.

Description

technical field [0001] The invention relates to a polluted soil leaching method, in particular to an ex-situ intensified leaching method for pyrithion-contaminated soil. Background technique [0002] Chlorpyrifos is a high-efficiency, broad-spectrum organophosphorus insecticide, which has triple effects of stomach poisoning, contact killing and fumigation against various pests. The pesticide was successfully developed by Dow Chemical Company of the United States in 1965, and it has become one of the pesticide monomer varieties with the largest production and usage in the world. The overall utilization rate of pyrithion field spraying is low, and most of it enters the soil system, which poses a serious threat to the rational use of soil resources and the sustainable development of the agricultural industry. The remediation and treatment of pyrithion-contaminated soil has become an important part of the remediation of contaminated sites. [0003] Remediation methods for pest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 范春辉
Owner SHAANXI UNIV OF SCI & TECH
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