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Method for removing byproduct bromate of ozone process from water

A bromate and water removal technology, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as excessive ferrous ion dosage, excessive total iron concentration, and low DO efficiency. Achieve the effects of easy access, large specific surface area and high reaction efficiency

Inactive Publication Date: 2010-12-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the bromate removal technology of ferrous ions still needs further research to solve the problems of excessive ferrous ion dosage, low efficiency of microbial nitrification to control DO, excessive total iron concentration, and long process flow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 900ml of distilled water and 1mg / L of NaBrO to a closed container with a volume of 1.0L 3 solution 100ml, so that the total volume of the solution is 1000ml, the initial NaBrO 3 The concentration is 100μg / L, and the magnetic stirrer is used to continuously stir at 400r / min, and the container is continuously fed with N 2 After 10 minutes, make the concentration of dissolved oxygen in the aqueous solution equal to 0.2mg / L.

[0020] Adjust the initial pH value of the aqueous solution in the reactor to be 7, the reaction temperature to be 20°C, and then add 1 mg of nano-iron (the mass concentration ratio between the nano-iron and bromate is 10:1) to the reactor, and react for 30 minutes. Use the Dionex-2000 ion chromatograph to detect the concentration of bromate in the aqueous solution, and use the ICE3500 atomic absorption spectrophotometer to detect the dissolved total iron content in the aqueous solution, and found that bromate and dissolved iron cannot be detected...

Embodiment 2

[0022] Add 800ml of distilled water and 1mg / L of NaBrO to a closed container with a volume of 1.0L 3 solution 200ml, so that the total volume of the solution is 1000ml, the initial NaBrO 3 The concentration is 200μg / L, and the magnetic stirrer is continuously stirred at 400r / min, and N is continuously passed through the container. 2 After 10 minutes, make the concentration of dissolved oxygen in the aqueous solution equal to 0.1mg / L.

[0023] Adjust the initial pH of the aqueous solution in the reactor to be 7, and the reaction temperature to be 20° C., then add 1 mg of nano-iron to the reactor (the mass concentration ratio between nano-iron and bromate is 5:1), and the reaction is carried out for 10 minutes. Use Dionex-2000 ion chromatograph to detect the concentration of bromate in the aqueous solution is 4.48μg / L, use ICE3500 atomic absorption spectrophotometer to detect the dissolved total iron content in the aqueous solution, it is found that the dissolved iron cannot be...

Embodiment 3

[0025]Add 950ml of distilled water and 1mg / L of NaBrO to a closed container with a volume of 1.0L 3 solution 50ml, so that the total volume of the solution is 1000ml, the initial NaBrO 3 The concentration is 50μg / L, and the magnetic stirrer is used to continuously stir at 400r / min, and the container is continuously fed with N 2 After 10 minutes, make the concentration of dissolved oxygen in the aqueous solution equal to 2 mg / L.

[0026] Adjust the initial pH of the aqueous solution in the reactor to be 7, and the reaction temperature to be 20° C., then add 2 mg of nano-iron to the reactor (the mass concentration ratio between nano-iron and bromate is 40: 1), and the reaction is carried out for 30 minutes. , using Dionex-2000 ion chromatograph to detect the concentration of bromate in the aqueous solution was 3.20 μg / L, and using ICE 3500 atomic absorption spectrophotometer to detect the content of soluble total iron in the aqueous solution to be 0.11 mg / L. It can be seen tha...

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Abstract

The invention discloses a method for removing a byproduct bromate of an ozone process from water. The method comprises the following steps of: (1) introducing nitrogen into a reactor filled with the aqueous solution of bromate so as to remove dissolved oxygen from the aqueous solution and ensure that the concentration of the dissolved oxygen in the bromate aqueous solution is less than or equal to 2 mg / L; and (2) adjusting the initial pH value of the aqueous solution in the reactor to be between 3.5 and 10.5 and the reaction temperature to be between 10 and 30 DEG C, and then adding nano-iron into the reactor and reacting for 10 to 30 minutes, wherein the mass concentration ratio of the nano-iron to the bromate in the aqueous solution is (5-40):1. Compared with the prior art, the method has the advantages of simple reaction conditions for removing the bromate, convenient operation, wide application range and high reaction efficiency; moreover, when a relatively small amount of nano-iron is added, the bromate removing rate is over 90 percent, and the iron content in the water is less than 0.3 mg / L, which meets the Standards for Drinking Water Quality (GB5749-2006).

Description

technical field [0001] The invention relates to a method for removing bromate, a by-product of the ozone process in water, which belongs to the water treatment process. Background technique [0002] Due to the deterioration of water quality, the traditional drinking water treatment technology in the past could not meet the "Drinking Water Hygienic Standard" (GB5749-2006), so advanced treatment technologies such as ozone oxidation have been widely used in drinking water treatment. However, if the water source contains bromide, it will produce carcinogenic bromate by-products after ozone oxidation treatment. Bromate has been classified as a potential carcinogen of level 2B (higher carcinogenic potential) by the International Agency for Research on Cancer. An adult with a body weight of 70Kg drinks 2L of water per day, when the concentration of bromate is 5, 0.5 and 0.05μg / L, the lifetime carcinogenic rate is 10 -4 , 10 -5 and 10 -6 . For this reason, my country's newly re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/58C02F101/12
Inventor 张燕刘宏远刘润生
Owner ZHEJIANG UNIV
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