Method for removing cyanide in waster water by ionizing radiation and ozone oxidization

An ionizing radiation and ozone oxidation technology, applied in the field of nuclear technology application and environmental protection, can solve the problems of high power consumption, inability to effectively destroy complex cyanide, high cost, etc., achieve fast reaction speed, no secondary pollution, The effect of reducing radiation dose

Inactive Publication Date: 2009-02-11
TSINGHUA UNIV
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Problems solved by technology

Ozone (O 3 ) Oxidation method consumes a lot of electricity and is expensive
Although alkaline chlorine oxidation, ozone oxidation, H 2 o 2 Oxidation method can oxidize simple cyanide, the product is CNO - (incomplete oxidation) or CO 2 , N 2 (completely oxidized), but none of these oxidizing agents are effective in destroying complex cyanide

Method used

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  • Method for removing cyanide in waster water by ionizing radiation and ozone oxidization
  • Method for removing cyanide in waster water by ionizing radiation and ozone oxidization
  • Method for removing cyanide in waster water by ionizing radiation and ozone oxidization

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Potassium cyanide (KCN) solution is prepared by analytical reagent and triple double distilled water, adjusts the pH=10.25 of solution respectively with NaOH, and the radiation source adopts Tsinghua University Institute of Nuclear Energy and New Energy Technology 60 Co radiation device with a radioactivity of 481TBq. In the experiment, 25ml of the solution was put into a 50ml radiation-resistant tube each time, and placed in the central hole for irradiation. The gamma dose rate of the central channel was measured to be 294Gy / min by a potassium dichromate (silver) dosimeter. Under the same reaction conditions, irradiation and irradiation-ozone combined process treatment were carried out respectively, and the treatment effect is shown in the attached figure 1 .

Embodiment 2

[0056] The preparation method of potassium cyanide (KCN) solution is the same as embodiment 1, adjusts the pH value=9,11 of solution respectively with NaOH, and radiation source and irradiation test method are identical with embodiment 1. Under the same reaction conditions, the irradiation and irradiation-ozone combined process treatment were carried out respectively, and the degradation effect of simple cyanide did not change much from that of Example 1.

Embodiment 3

[0058] The radiation source in Example 1 was changed to a 0.5 Mev, 20 mA Dynamitron type electron accelerator, and the dose rate of the electron beam was 21.2 kGy / min. Other conditions are constant, the degradation effect of simple cyanide and embodiment 1 change little.

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Abstract

The invention relates to a method for removing cyanides in wastewater by using the ionizing radiation which is combined with ozone oxidation, in particular to the method for removing the simple and complex cyanides in the wastewater by utilizing the ionizing radiation technology (such as Gamma-ray or electron beam) which is combined with the ozone oxidation, and the method belongs to the technology field of nuclear technology application and environmental protection. Although the currently adopted alkaline chlorine oxidation method, the ozone oxidation method, the H2O2 oxidation method and the like for the cyanide-containing wastewater with the low concentration can oxidize the simple cyanides, the methods can not effectively damage the complex cyanides. The method adopts the combined use of the ionizing radiation and ozone to generate hydroxyl free radical. OH with stronger oxidation capacity and lower selectivity, the oxidation-reduction potential (E<0> is equal to 2.8V) is higher than the ozone (E<0> is equal to 2.07V) by 35 percent, and the reaction rate is 100 to 1000 times of the ozone. The method can not only reduce the radiation dose which is needed by the individual ionizing radiation treatment, but can oxidize and decompose the complex cyanides which are difficult to degrade by the alkaline chlorine oxidation method, the ozone oxidation method, the H2O2 oxidation, and the like.

Description

technical field [0001] The invention belongs to the field of nuclear technology application and environmental protection, and particularly relates to a method for removing cyanide in waste water by using ionizing radiation technology (such as gamma rays or electron beams) combined with ozone oxidation. Background technique [0002] Cyanide-containing wastewater has a wide range of sources, such as various wastewater discharged from metallurgy, chemical industry, electroplating, coking, pesticides, fertilizers, gas, oil refining, acrylonitrile and other processes. Cyanide is a general term for chemical substances containing a cyano group (—C≡N) in their molecular structure. According to whether the element or group connected to the cyano group is organic or inorganic, cyanide is divided into two categories: organic cyanide and inorganic cyanide. The former is called nitrile, and the latter is often referred to as cyanide. According to the nature and composition, cyanide is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/78C02F1/58C02F1/30C02F101/18
Inventor 何仕均王建龙吴金玲
Owner TSINGHUA UNIV
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