Method for degrading organophosphorus pesticide based on sweep-frequency double-frequency ultrasonic technology

An organophosphorus pesticide, ultrasonic technology, applied in chemical instruments and methods, mechanical oscillation water/sewage treatment, water pollutants, etc., can solve problems such as degrading harmful substances, and achieve the effect of energy saving and no secondary pollution.

Active Publication Date: 2012-04-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For refractory organophosphorus pesticide pollutants, the method of sweeping and multi-frequency ultrasonic is used for degradation, which overcomes the shortcomings of single-frequency and fixed-frequency ultrasonic that cannot effectively degrade harmful substances in a low-carbon manner.

Method used

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  • Method for degrading organophosphorus pesticide based on sweep-frequency double-frequency ultrasonic technology
  • Method for degrading organophosphorus pesticide based on sweep-frequency double-frequency ultrasonic technology

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Dimethoate solution with an initial concentration of 3 mg / L was prepared with 40% dimethoate EC. The temperature was set at 25 °C, the reactor volume was 4 L, and the dimethoate solution was ultrasonically treated under constant frequency conditions of 22 kHz, 28 kHz, 33 kHz, 40 kHz and 68 kHz. The optimal degradation frequency was 68 kHz, and the optimal degradation rate of dimethoate was 34.8 % after 180 min.

[0023] Table 1 The degradation rate of dimethoate pesticides at different frequencies (%)

[0024] 0 minutes 20 minutes 40 minutes 60 minutes 90 minutes 120 minutes 150 minutes 180 minutes 22 kHz 0 2.15 3.18 6.43 8.1 12.49 13.93 16.33 28 kHz 0 3.59 4.64 6.03 9.21 13.32 13.43 16.64 33 kHz 0 3.21 7.82 11.5 14.27 15.21 15.3 18.78 40 kHz 0 1.78 2.76 5.51 8.66 9.72 9.94 12.13 68 kHz 0 4.59 10.4 16.87 22.92 26.72 30.63 34.8

Embodiment 2

[0026] Different volumes of dimethoate pesticide solutions were treated with 68 kHz fixed-frequency ultrasonic waves, the pesticide concentration was 3 mg / L, and the treatment time was 180 min. It was concluded that the degradation rate was the highest when the treatment volume was 8 L, and the degradation rate was 49.02 %.

[0027] Table 2 The degradation rate (%) of dimethoate pesticide under different treatment volumes

[0028] Capacity (L) 4 6 8 10 12 14 Degradation rate(%) 36.51 48.61 49.02 37.05 34.35 33.74

Embodiment 3

[0030] 68 kHz ultrasonic wave was used as the degradation frequency, the initial concentration of dimethoate was 3 mg / L, and the treatment volume was 4 L. Investigate fixed frequency (frequency 68 kHz) and sweep frequency (periods are 100 ms, 300 ms, 500 ms, 700 ms and 900 ms respectively, and the frequency changes linearly between 66 kHz and 70 kHz), the two ultrasonic modes have great effect on music effect on fruit degradation. The degradation of dimethoate under all sweeping frequency conditions was better than that under the constant frequency condition, and the effect was the best when the sweeping frequency was 100 ms, and the degradation rate of dimethoate was 63.3% in 180 min.

[0031] Table 3 The degradation rate of dimethoate under different frequency sweep periods (%)

[0032] 0 minutes 45 minutes 90 minutes 135 minutes 180 minutes fixed frequency 0 8.96 15.77 20.56 26.78 100ms 0 25.86 44.77 54.99 63.24 300ms 0 27....

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Abstract

The invention discloses a method for degrading an organophosphorus pesticide based on a sweep-frequency double-frequency ultrasonic technology, and relates to the fields of agricultural environment and water protection. The method comprises the following steps of: putting an aqueous solution of the organophosphorus pesticide dimethoate into a reactor of equipment; and by setting different frequencies and different sweep frequency periods of a single frequency or a double frequency, setting the total volume of the aqueous solution of the organophosphorus pesticide dimethoate in the reactor, and performing sweep-frequency ultrasonic treatment at 25DEG C fro 40 to 180 minutes, wherein the concentration of the organophosphorus pesticide is 1.8-5.4mg / L. Toxic and harmful pollutants are degraded by the ultrasonic technology to the greatest extent, and the method has the advantages of high efficiency, no secondary pollution and energy conservation.

Description

technical field [0001] The invention relates to the fields of agricultural environment and water body protection, and relates to a method for degrading toxic substances, in particular to a method for degrading organophosphorus pesticides by using frequency-sweeping and double-frequency ultrasonic waves. Background technique [0002] Sound waves with a frequency greater than 16 kHz are called ultrasonic waves, which can promote chemical reactions, and ultrasonic radiation with a frequency range of 16 kHz to 1 mHz can cause complex physical and chemical changes in the medium. According to the theory of ultrasonic cavitation: cavitation bubbles formed by ultrasonic cavitation are manifested in a series of processes such as shock, growth, shrinkage and collapse in the liquid; 10 7 ~1.0×10 8 Pa high temperature and high pressure; entering the water body inside the cavitation bubble can generate H, O and OH free radicals, and then generate OOH and H 2 o 2 Particles with high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/36C02F101/30
Inventor 马海乐任晓锋王振斌孙宝胜
Owner JIANGSU UNIV
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