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Method and device for decomposing environmental pollutants

A material and substantive technology, applied in the direction of water pollutants, polluted groundwater/leachate treatment, washing equipment, etc., can solve the problems of insufficient oxidation capacity and inability to decompose, and achieve treatment efficiency improvement, attenuation suppression, and high-efficiency irradiation The effect of decomposition

Inactive Publication Date: 2004-10-06
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the above-mentioned prior art, since most of the molecules gasified and moved in the cavitation bubbles disappear, although it is expected that the molecules moving to the gas-liquid interface can be oxidatively decomposed by OH radicals, but for the molecules in the liquid Hydrophilic molecules that stay in the phase are mainly decomposed by hydrogen peroxide, and there is a problem that they cannot be decomposed due to lack of oxidation ability due to molecular structure

Method used

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  • Method and device for decomposing environmental pollutants
  • Method and device for decomposing environmental pollutants
  • Method and device for decomposing environmental pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] Using the decomposition device shown in Figure 1, 3 L of high-concentration aqueous solution of tetrachlorethylene 150 mg / L, one of the volatile organic chlorides to be treated, is simultaneously used with 380 kHz, 200 W ultrasonic waves and ultraviolet rays with a maximum intensity near 260 nm. Irradiation was performed and the residual perchlorethylene concentration was determined over time. The result is as Figure 21 shown.

Embodiment 2

[0162] Using the decomposition device in Fig. 1, 20ml of the 1mg nitrogen / L (1mg N / L) solution of ammonium sulfate aqueous solution, one of the nitrogen-containing compounds of the treated solution, has the maximum intensity near 260nm with 200kHz, 200W ultrasonic waves and wavelength Simultaneously irradiated with ultraviolet rays, and measured the change of the decomposition product nitrate ion generation rate with time. The result is as Figure 22 shown.

Embodiment 3

[0169] use Figure 15 The decomposing device, as one of the volatile organic chlorides of the treated solution, 3L of high-concentration aqueous solution of tetrachlorethylene 150mg / L, adjusted the pH value of the treated solution to 5 with phosphoric acid buffer solution in advance, and then used 380kHz , Ultrasonic waves of 200W and ultraviolet rays with the maximum intensity near 260nm are irradiated at the same time, and the concentration of residual tetrachlorethylene is measured over time. The result is as Figure 23 shown.

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Abstract

The present invention provides a method and a device, by which it is possible to decompose and treat a large amount of organic halogen compounds, etc. which are environmental pollutants, to a low concentration range at which it is dischargeable as waste liquor to sewage in a short time, and it is also possible to decompose organic substances and nitrogen or phosphorus compounds which are hardly decomposable by oxidation. To a sample solution 20 contained in a reaction vessel 10a in which an aqueous solution containing environmental pollutants is stored, for example, ultrasonic waves 50 are irradiated from a transducer 30a disposed at the central bottom portion of the reaction vessel 10a, and at the same time, ultraviolet rays are irradiated from an ultraviolet lamp 40a disposed at the peripheral edge of the reaction vessel 10a. In this instance, the ultraviolet lamp 40a is disposed at a position such that it does not interfere with the path of travel of ultrasonic waves 50.

Description

[0001] technology area [0002] The present invention relates to a method and its device capable of decomposing and harmless various pollutants in the environment. A method and device for decomposing organic solvents, organic substances contained in rivers, lakes, etc., nitrogen and phosphorus compounds, etc., simply and efficiently. Background technique [0003] In organic solvents, especially organic halides such as tetrachloroethylene, trichloroethylene, dichloroethane, etc., have been used in various manufacturing and washing industries as cleaning agents with excellent solubility in oils and fats. It has been used until now, but in recent years, its discharge into the environment has been restricted due to the discovery that it may cause cancer. However, the current situation is that the pollution caused by organic chlorides in the atmosphere, public waters, soil and other environments is still unresolved, and people are still seeking alternative solvents or methods for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/00A62D3/13A62D3/176A62D3/34A62D3/36A62D3/38A62D101/22A62D101/28B01J19/10B01J19/12C02F1/32C02F1/36C02F1/66C02F1/72D06F43/08
CPCB01J2219/00038C02F2103/06C02F2201/3227B01J2219/0877B01J19/10B01J2219/0004C02F2209/02C02F1/722C02F1/66C02F1/36B01J2219/00137C02F2101/363C02F2101/322C02F1/325B01J2219/00015C02F2201/3228C02F2209/06A62D2203/10C02F2101/366B01J19/123C02F2101/36C02F1/32
Inventor 川上幸次北出雄二郎加藤修久
Owner FUJI ELECTRIC CO LTD
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