Method for removing organic pollutant in water by catalysis ozonation

A technology for removing organic pollutants and water, applied in water pollutants, oxidized water/sewage treatment, chemical instruments and methods, etc., can solve problems such as secondary pollution of water bodies, human health effects, etc., to reduce toxicity and reduce bromic acid Salt formation, effect of overcoming the influence of oxidation efficiency

Inactive Publication Date: 2008-12-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 decomposit

Method used

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specific Embodiment approach 1

[0009] Specific embodiment one: the method for catalytic ozonation of this embodiment to remove organic pollutants in water is realized by the following steps: a, in the form of a fluidized bed or a fixed bed, a solid catalyst with a particle size of 1 nm to 10 cm is put into the ozone catalytic oxidation contact reaction In the reactor, the total thickness of the solid catalyst is controlled at 10-500cm; b. The water to be treated is introduced into the reactor in a downstream, counter-current or mixed manner at a water flow rate of 1-50m / h, before the reactor or The reactor adopts titanium plate microporous aeration, standpipe aeration or surrounding uniform aeration to carry out ozone distribution. Add hydrogen peroxide at a molar ratio of 1:0.1~1; c. Control the contact time between ozone, hydrogen peroxide and water to be treated at 1 to 300 minutes, and contact the catalyst with water to be treated containing ozone and hydrogen peroxide The time is 1 to 180 minutes, that...

specific Embodiment approach 2

[0010] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the reactor in step a adopts a tubular type, an oxidation tank or an oxidation tower. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the solid catalyst in step a is arranged continuously, segmented or layered; wherein segmental arrangement is adopted in the tubular or oxidation pool reactor, each segment The length is 1-100cm, and the middle interval is 1-100cm; in the oxidation tower reactor, it is arranged in layers, and the thickness of each layer is 1-100cm, and the middle interval is 1-100cm. Other steps and parameters are the same as those in Embodiment 1.

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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 ...

Claims

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Application Information

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IPC IPC(8): C02F1/78C02F101/30
Inventor 马军王胜军
Owner HARBIN INST OF TECH
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