Method for controlling generation quantity of bromic acid radicle in treating procedure for oxidizing drinking water by ozone

A drinking water treatment, ozone oxidation technology, applied in the direction of oxidation water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc.

Inactive Publication Date: 2007-10-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of consumption of residual chlorine, pipe network corrosion, and generation of toxic substances in the process of introducing some chemical agents to reduce the amount of bromate generated in the current ozone oxidation drinking water treatment process, and to provide a method for controlling the ozone oxidation drinking water treatment process. Method for generating amount of bromate in the process

Method used

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specific Embodiment approach 1

[0011] Specific embodiment one: the method for controlling the amount of bromate generation in the ozone oxidation drinking water treatment process in the present embodiment: one, carry out ozonation and oxidation through the filtered water after the traditional water treatment process (coagulation, sedimentation, filtration etc. treatment) The solid metal oxide catalyst catalyzes the oxidation; 2. The oxidized water enters the activated carbon or biological activated carbon filter bed, and the residence time is controlled at 5-20 minutes to further remove the organic matter in the water; 3. The water removed from the organic matter enters the network pipe after being chlorinated and sterilized .

[0012] In the process of water treatment in this embodiment, in the case of a bromide ion concentration of 100-200 μg / L, a cerium oxide dosage of 100 mg / L can reduce bromate generation by 80% compared with that of ozone oxidation alone, and achieve higher results than adding chemical...

specific Embodiment approach 2

[0013] Specific embodiment two: In this embodiment, the filtered water enters the ozone contact tower for 10s to 15 minutes in the present embodiment, wherein 0.1 to 4.0 mg of ozone is added per mg of TOC; the water coming out of the ozone contact tower Then enter the catalyst bed filled with a solid metal oxide catalyst, and control the catalytic oxidation time of the catalyst to be 10s-15min. Other steps and process conditions are the same as those in Embodiment 1.

specific Embodiment approach 3

[0014] Embodiment 3: In this embodiment, the filtered water in step 1 enters the ozone contact tower filled with solid metal oxide catalyst to carry out catalytic ozonation reaction, and the reaction time is 10s-15min. Other steps and process conditions are the same as those in Embodiment 1.

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Abstract

This invention relates to a method for controlling the quantity of bromate ions produced during treatment of ozone-oxidized drinking water. The method solves the problems of consuming residual chlorine, eroding pipes and meshes, and generating toxic substances by present techniques. The method controls the quantity of bromate ions by introducing cerium oxide, transition metal oxide-doped cerium oxide or supported cerium oxide catalyst for catalytic oxidation. The quantity of produced bromate ions is decreased by 80% when the bromic ions concentration is 100-200 mu.g / L and the consumption of cerium oxide is 100 mg / L. The method has a high efficiency in inhibiting the generation of bromate ions, and the yield of byproducts is 20-30% lower than that produced by pure ozone oxidation.

Description

technical field [0001] The invention relates to a method for controlling the amount of bromate generated, in particular to a method for using a solid catalyst to reduce the amount of bromate generated when ozone oxidizes water containing bromide ions. Background technique [0002] In recent years, surface water plants have used ozone more and more as a measure to oxidize and decontaminate drinking water. If surface water contains bromide ions, it will cause new problems in ozone oxidation. Bromide ions in water will be partially oxidized into hypobromous acid and bromate during the ozone oxidation process, and the remaining unoxidized bromide ions will be oxidized by chlorine into hypobromous acid during the final chlorine disinfection process, and hypobromous acid is easy A substitution reaction occurs with natural organic matter (NOM) in surface water to produce harmful brominated by-products such as bromoform, dibromoacetonitrile, dibromoacetic acid, and cyanogen bromide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/78C02F1/28C02F1/50B01J23/83B01J23/34B01J23/10
Inventor 马军张涛陈伟鹏
Owner HARBIN INST OF TECH
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