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Strengthening method for pollution removing by ozone acidic oxidation

An ozone and acid technology, applied in the field of strengthening ozone acid oxidation and decontamination, can solve the problems of high residual ozone concentration, low oxidation efficiency, low ozone utilization efficiency, etc. Effect

Active Publication Date: 2013-12-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of low oxidation efficiency, low ozone utilization efficiency and high residual ozone concentration in the acidic environment of the existing ozone oxidation system, the present invention provides a method for strengthening ozone acid oxidation and decontamination, which uses several aromatic structures unexpectedly discovered by us. The organic compound is used as a strengthening agent to accelerate the decomposition of ozone, and produce non-selective and extremely strong oxidizing hydroxyl radicals to decompose pollutants in water, which can effectively reduce the treatment cost of acidic water bodies, and is suitable for the treatment of various substances

Method used

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  • Strengthening method for pollution removing by ozone acidic oxidation

Examples

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Embodiment 1

[0040] A kind of enhanced ozone acid oxidation decontamination technology is realized through the following steps in the present embodiment: In the ozone contact pool, add ozone and strengthening agent simultaneously to the acidic water containing pollutant-2,4,6-trichlorophenol , and then uniformly stirred by hydraulic force to make it react. Wherein the ozone dosage is 20mg / L, the molar equivalent ratio of strengthening agent and ozone is 1:500, and hydraulic retention time is 10 minutes; O used in the present embodiment 3 There are many kinds of enhancers, namely salicylic acid, p-hydroxybenzoic acid, m-hydroxybenzoic acid, polyhydroxybenzoic acid, phthalic acid, naphthoic acid, anthracene formic acid, phenanthrene formic acid, diphenylformic acid, biphenyldicarboxylic acid, Phenol, aniline, anisole. And each of the above substances was tested as a strengthening agent one by one: the content of 2,4,6-trichlorophenol in the treated acid wastewater was greatly reduced, and t...

Embodiment 2

[0045] In this example, salicylic acid (2HBA), hydroxybenzoic acid (3HBA) and p-hydroxybenzoic acid (4HBA) were used as enhancers for testing and used according to the following steps: To target 2,4,6-trichlorophenol Add ozone water and ozone enhancer to the water body of pollutants, mechanically stir evenly, and complete the promotion of the ozone system after 5 minutes of reaction; the initial concentration of 2,4,6-trichlorophenol is 2.0mg / L, and the ozone concentration The concentration is 1.2mg / L, the molar ratio of enhancer to ozone is 1:30, the pH of the solution is 2.0, and the reaction temperature is 20°C. The removal effect of 2,4,6-trichlorophenol and the change of ozone decay rate are shown in figure 1 and figure 2 .

[0046] In this embodiment, the ozone is added in the form of ozone-saturated water.

[0047] In this embodiment, the strengthening agent significantly promoted the decomposition of ozone to produce hydroxyl radicals, the half-life of ozone was sh...

Embodiment 3

[0049] The difference between this embodiment and embodiment 2 is that the pH of the solution is 1.0. Other steps and parameters are the same as in Example 2.

[0050] In this example, salicylic acid (2HBA), hydroxybenzoic acid (3HBA) and p-hydroxybenzoic acid (4HBA) were used as enhancers to remove pollutants (2,4,6-trichlorophenol) in water after 10 minutes of reaction The removal rate increased by 26%, 24% and 30% in turn relative to the removal rate in the case of only using ozone.

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Abstract

The invention discloses a strengthening method for pollution removing by ozone acidic oxidation, and belongs to the technical field of water processing. The strengthening method comprises: simultaneously adding ozone and an intensifying agent into pollution-containing acidic water, then stirring uniformly by waterpower or machinery and reacting, wherein the adding amount of ozone is 0.5-30 mg / L and the molar ratio of the intensifying agent to ozone is 1:5-1000, and waterpower staying time is 1-20 min, and the intensifying agent is one kind or any combination of benzoic acid, salicylic acid, p-hydroxybenzoic acid, m-hydroxybenzoic acid, multihydroxybenzoic acid, phthalic acid, naphthoic acid, anthracenecarboxylic acid, phenanthrenecarboxylic acid, biphenylcarboxylic acid, 4,4'-biphenyldicarboxylic acid, phenol, aniline and anisole. The strengthening method is capable of effectively improving pollution-removing efficiency and expanding the conditions about pH and strong acidity of ozone technology application, has high ozone utilization rate, also is capable of effectively reducing processing cost of acidic water, and is applicable to processing of a plurality of substances.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular, relates to a method for strengthening ozone acid oxidation to remove pollution, more specifically, relates to a method for strengthening O 3 A technology for oxidative degradation of pollutants, especially a method that enables ozone to be applied to the oxidation treatment of refractory pollutants containing chlorine, nitro, carboxyl and other substituent groups. Background technique [0002] In recent years, with the increasing number of toxic and harmful pollutants in water bodies, including endocrine disruptors (EDCs), drugs (PPCPs), persistent organic pollutants (POPs), pesticides, algae toxins, antibiotics, etc., conventional water treatment processes Faced with the problems of being unable to degrade toxic and harmful pollutants and producing "three causes" (carcinogenic, teratogenic, and mutagenic) disinfection by-products, it is urgent to develop a method that can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78
Inventor 潘丙才黄先锋李旭春张炜铭张淑娟
Owner NANJING UNIV
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