Method of degrading Napolean green in waste water

Abstract

The method of degrading Napolean green in waste water is to degrade Napolean green in waste water with ultraviolet ray of 185 nm wavelength. Waste water containing Napolean green in 10 mg / L is first fed into a water tank, and then the waste water is pumped into the 185 nm ultraviolet reactor in the flow rate of 0.14-0.70 L / min while the reacted waste water is pumped into the water tank circularly in the flow rate of 40-160 L / hr. Monitoring on the Napolean green concentration of the water sample from the water tank shows that the Napolean green degrading rate in 40 min reaches over 99 % and the waste water reaches the draining stardard. The 185 nm wavelength ultraviolet ray acts on water to produce homolytic reaction of water and produce hydrated electrons in high concentration as active intermediate. The present invention has high degrading effect, high degrading speed, low running cost, no secondary pollution and other advantages.

Description

technical field [0001] The invention relates to a method for degrading malachite green in waste water. Specifically, 185nm ultraviolet light is used to degrade the malachite green, so as to achieve the purpose of treating the malachite green pollution in waste water in food, printing and dyeing and other industrial fields. Background technique [0002] Malachite green is a kind of green crystal with metallic luster, which is a basic dye and a triphenylmethane dye. Malachite green has side effects such as high toxicity, high residue, carcinogenicity, teratogenicity and mutagenicity. In view of the harmfulness of malachite green, many countries have listed malachite green as a banned drug in aquaculture, and any fish is not allowed to contain such substances. And this chemical should not be in any food. my country, the United Kingdom and European countries have issued another food safety alert following the "Sudan No. 1". The domestic media immedi...

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Problems solved by technology

[0004] 1. Activated carbon adsorption, this method has a relatively simple process, but activated carbon needs to be regenerated at high temperature, resulting in high energy consumption and cost; large equipment and floor space

Frequent backwashing of activated carbon brings inconvenience to operation, consumes a lot of water, and the discharged waste liquid is easy to cause secondary pollution

[0005] 2. Directly oxidize with oxidizing agents, such as hydrogen peroxide, ozone, chlorine dioxide, etc. The degradation effect of these oxidizing methods is poor

[0006] 3. Ultrasonic method, using the "cavitation" formed by ultrasound to degrade malachite green in water, but the degradation effect is not obvious, and the ultrasonic equipment is relatively expensive

[0007] 4. Catalytic oxidation method, the catalyst used such as titanium dioxide is relatively expensive, and the titanium dioxide must be prepared into a certain shape and size, and precious metal modification must be added, so the cost is also high

[0008] 5. Using traditional biological treatment methods, because malachite green is toxic and harmful, biological bacteria are easily poisoned and lose the effect of degrading malachite green

[0009] 6. In recent years, the research on the degradation of organic matter in water by vacuum ultraviolet ray is a hot spot, but at present, only 254nm ultraviolet irradiation is used to degrade malachite green in water, but the degradation effect is not good: use 10mg / L malachite green solution to irradiate with 254nm ultraviolet Within 40 minutes, take samples and analyze every 15 minutes, and use C / C 0 ~t makes a graph and draws figure 2 The degradation rate is 47.3%

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