A fast, efficient and selective method for degrading trace amounts of benzopyrene in water

Abstract

The invention relates to a method for rapid, high-efficiency and selective degradation of trace benzopyrene in water. The method comprises the following steps: cutting trace-benzopyrene-containing wastewater having undergone biochemical treatment into water films with a filling material in a catalytic ozonation reactor; allowing the water films to contact with ozone or ozonized air flowing along a reverse direction and to be dissolved; and selectively degrading trace benzopyrene in the wastewater under the preferential adsorption and catalytic oxidation coupling effects of a molecular imprinting filling material. According to the invention, molecular imprinting technology and catalytic ozonation technology are combined, and trace benzopyrene in the wastewater is rapidly, highly efficiently and selectively treated; the absorption rate of ozone is more than 90% in 10 min in the catalytic ozonation reactor, so the removal rate of trace benzopyrene is more than 99%. The method can be widely applied to deep and recycling treatment of a variety of sewage and wastewater containing benzopyrene.

Description

technical field [0001] The invention relates to a method for rapidly, efficiently and selectively degrading trace amounts of benzopyrene in water. The method can quickly, efficiently and selectively remove trace amounts of benzopyrene pollutants in water, and is applicable to the technical field of advanced and recycling treatment of coking, oil refining, asphalt, plastic and other industrial wastewater. Background technique [0002] In recent years, with the continuous development of coal chemical industry, petroleum, plastics, coking and other chemical industries, a large number of polycyclic, heterocyclic, long-chain and other refractory organic pollutants (such as polycyclic aromatic hydrocarbons) have also been produced. Among them, benzopyrene is the most toxic and strong carcinogen among polycyclic aromatic hydrocarbons, which can cause genotoxicity in prokaryotes and mammalian cells. It enters the human environment, especially the water environment, through differen...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the practical application of ozone catalytic oxidation technology: (1) The traditional ozone catalytic oxidation reactor adopts the mode of "gas dispersed in water", and the gas diffuser is used to form small bubbles of ozone, which are dissolved in contact with the liquid phase

These solid catalyst products have the problems of low stability, and their active components are easy to flow away with the water flow, which leads to the reduction of ozone catalytic effect.

(3) The tail gas generated after the ozone catalytic oxidation reaction is not properly disposed of, causing ecological and environmental problems

(4) The catalytic oxidation of ozone to degrade organic matter is a reaction process based on free radicals, which has no selectivity for pollutants, and it is difficult to selectively remove target substances in complex water bodies where multiple pollutants coexist.

But its defects are also obvious: ozone is easy to escape from the bottom of the reactor with the effluent, although the ozone tail gas is destroyed, there are still ecological safety risks

In addition, it cannot selectively treat organic matter, and the removal effect on low-concentration organic matter or specific target organic matter is not good, and the purpose of effectively degrading trace amounts of benzopyrene cannot be achieved.

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