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Method for controlling formation quantity of bromate in ozone oxidized water treatment process by TiO2

A technology of ozone oxidation and nano-titanium dioxide, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of reducing organic matter, high safety and reliability of drinking water, and increasing the production potential of total organic bromine

Inactive Publication Date: 2012-08-01
NANKAI UNIV
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Problems solved by technology

[0005] In order to effectively suppress the generation of bromate when ozone oxidizes water containing bromide ions, simultaneously improve the efficiency of ozone oxidation to control chlorination disinfection by-products and reduce organic matter, and at the same time solve the problem of the safety and reliability of drinking water by the existing bromate control method Negative effects (generating more toxic nitrogen-containing disinfection by-products, increasing the generation potential of total organic bromine, etc.)

Method used

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  • Method for controlling formation quantity of bromate in ozone oxidized water treatment process by TiO2
  • Method for controlling formation quantity of bromate in ozone oxidized water treatment process by TiO2
  • Method for controlling formation quantity of bromate in ozone oxidized water treatment process by TiO2

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specific Embodiment approach 1

[0016] Specific implementation mode 1: The sinking water after coagulation and precipitation treatment by the conventional treatment process enters the catalytic bed filled with supported nano-metal oxides for catalytic ozone oxidation, the ozone enters from the bottom of the catalytic bed, and the sinking water flows from the catalytic bed The part near the top enters, the ozone dosage is: 0.4-3.5mgO 3 / mgDOC, the catalytic contact time is: 10-20min; the effluent enters the sand filter / activated carbon filter for further filtration, then adds chlorine (chloramine) for disinfection, and then sends it to the user. See attached for specific process figure 1 .

specific Embodiment approach 2

[0017] Specific implementation mode 2: Different from the above-mentioned implementation method 1, the water after sinking enters the first-stage ozone catalytic oxidation bed to carry out the ozone oxidation reaction for 5-15 minutes, and the water still containing ozone from the ozone catalytic oxidation bed enters the interior to fill with a load In the second-stage catalyst bed of the type nanometer metal oxide catalyst, the time for controlling the second-stage catalytic oxidation is 5-10 minutes. Other steps and process conditions are the same as the above method. See attached for specific process figure 2 .

specific Embodiment approach 3

[0018] Specific implementation method three: different from the above-mentioned implementation methods one and two, when the sinking water enters the catalytic bed filled with loaded nano-metal oxides for catalytic ozonation, the sinking water is positively discharged from the bottom of the catalytic bed (or catalytic tank). Enter from below or enter through the bottom water inlet of the ejector (the specific location is shown in the attached image 3 As shown), ozone enters from the side of the bottom of the catalytic bed through the gas distribution plate or jet device and quickly contacts with the sinking water, and immediately catalyzes ozone oxidation through the catalyst. Other embodiments and process conditions are the same as those of the first and second methods.

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Abstract

The invention relates to a method for controlling the formation quantity of bromate in an ozone oxidation process of drinking water by introducing a nano TiO2 catalyst, which avoids negative effects brought to the safety and the reliability of the drinking water of the traditional method for controlling the bromate by adding chemical drugs. According to the method, settled water treated by a conventional method is directly filled into a nano TiO2 catalyst bed for ozone contact and catalytic ozone oxidation, or after the settled water is subjected to ozone contact and catalytic ozone oxidation in a primary nano TiO2 catalyst bed, water still containing ozone is filled into a secondary nano TiO2 catalyst bed for carrying out a catalytic reaction, wherein the contact oxidation time is 10-20min. The method has the advantages that the nano TiO2 has obvious efficiency of reducing the formation quantity of the bromate in the ozone oxidation process and also has obvious control efficiency to the formation quantity of the bromate in the ozone oxidation process of water with high bromide ion concentration, the formation potential to trihalomethane and the reduction efficiency to DOC of individual ozone oxidation can be improved, and other toxic and side effects cannot be caused to the quality of the drinking water.

Description

technical field [0001] The invention relates to a method for suppressing the generation of bromate in the process of ozone oxidation, in particular to a method using nanoscale titanium dioxide (TiO 2 ) as a catalyst to control the amount of bromate generated when ozone oxidizes water containing bromide ions. Background technique [0002] In recent years, with the increasing pollution of water sources and the continuous improvement of drinking water quality standards, many surface water plants have gradually begun to use ozone oxidation as a pretreatment or advanced treatment process. In the production of some high-quality drinking water and mineral water, ozone is often an indispensable advanced treatment or disinfection process. However, if there are bromide ions in the water, ozone oxidation will lead to the formation of bromate, which has potential carcinogenic effects and has been classified as a 2B potential carcinogen by the International Agency for Research on Cancer...

Claims

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Application Information

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IPC IPC(8): C02F1/78
Inventor 鲁金凤刘一夫王冬倪磊钱敏蕾王艺王楚亚
Owner NANKAI UNIV
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