Method for removing organic pollutant in water by catalysis ozonation

Abstract

The invention relates to a catalytic ozonation method for removing the organic pollutant, which solves the problems that in the prior art both the residual hydrogen peroxide from the homogeneous catalysis ozonation using hydrogen peroxide as catalyst and the byproduct bromate produced by the heterocatalysis ozonation using metal oxide as catalyst play a bad impact on human health and cause secondary pollution of water. The method of the invention comprises the following steps: a. laying the catalyst in a reactor; b. adding ozone and hydrogen peroxide; c. controlling the contacting time of the ozone and the hydrogen peroxide, that is, finishing the removal of the organic pollutant in water. The method of the invention dissolves the problem of residual hydrogen peroxide, reduces the formation of the bromate without causing the secondary pollution of water and affecting human health, which is suitable to apply in the real water treatment process as a drinking water advanced treatment technology.

Description

technical field [0001] The invention relates to a method for removing organic pollutants in water. Background technique [0002] The organic matter in the water body mainly includes macromolecular natural organic matter, trace organic pollutants, odor substances, algae and their metabolites, etc. These organic substances, especially organic pollutants from industrial processes such as organic chemical industry, petrochemical industry, medicine, pesticides and herbicides, have the characteristics of low concentration and high toxicity, and many of them can produce carcinogenic, teratogenic and mutagenic substances. It is extremely harmful to human health, and the traditional water treatment process has poor removal effect on these organic pollutants. [0003] At present, advanced treatment technologies, such as catalytic ozonation, are used to remove organic pollutants in water; catalytic ozonation processes include homogeneous catalytic ozonation using hydrogen peroxide as ...

AI Technical Summary

Problems solved by technology

[0004] The object of the invention is to solve the hydrogen peroxide surplus in the homogeneous catalytic ozonation with hydrogen peroxide as a catalyst and the by-product bromate generated in the heterogeneous catalytic ozonation with solids such as metal oxides as a catalyst, Both have an impact on human health and lead to secondary pollution of water bodies, and provide a method for catalytic ozonation to remove organic pollutants in water

[0006] In the present invention, the homogeneous hydrogen peroxide catalyzed ozonation process is coupled with the heterogeneous metal oxide catalyzed ozonation process, so that the two produce a synergistic effect; the added solid catalyst itself has the ability to catalyze the decomposition of ozone to generate hydroxyl radicals ability, can promote the decomposition of hydrogen peroxide, solve the problem of remaining hydrogen peroxide, and at the same time, hydrogen peroxide decomposition process will also produce strong oxidative hydroxyl radicals, which improves the oxidation efficiency; the added hydrogen peroxide can promote Ozone decomposes to produce hydroxyl radicals, which overcomes the influence of impurities in water on oxidation efficiency and improves oxidation efficiency. At the same time, ozone decomposes faster, thereby reducing the remaining ozone concentration in water, reducing the generation of bromate, and will not cause secondary pollution of water bodies. Does not affect human health