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Method for controlling generation of bromate in ozone/activated carbon advanced water-treatment process

A technology of activated carbon and water treatment, applied in the direction of oxidized water/sewage treatment, water/sludge/sewage treatment, polluted waterway/lake/pond/river treatment, etc. It can solve the problems such as the decrease of quantity, and achieve the effect of simple reaction conditions, wide application range and obvious control effect

Inactive Publication Date: 2017-09-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are certain limitations in each of these methods, such as reducing the pH of the solution to control the generation of bromate in raw water containing high alkalinity requires adding a large amount of reagents, and the operating cost increases thereupon; membrane filtration and ion exchange methods, etc. In the actual production process, it is easy to suffer from membrane fouling, which leads to a decrease in water flux and increases the cost of water treatment; although the ammonia addition method controls the formation of bromate to a certain extent, it may produce toxic nitrogen-containing disinfection by-products; The energy consumption of ultraviolet irradiation is high, and the economy is poor; the free radical scavenger method reduces the oxidation capacity of the oxidation system while reducing the amount of bromate generation
Lowering the solution pH method, membrane filtration method and ion exchange method are less economical, the ammonia addition method may lead to the generation of toxic nitrogen-containing disinfection by-products, the treatment cost of the ultraviolet irradiation method is relatively high, and the free radical scavenger method is effective in reducing bromine. Therefore, how to control the generation of bromate in the water body is very important when using the ozone / activated carbon process to carry out advanced treatment of drinking water

Method used

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  • Method for controlling generation of bromate in ozone/activated carbon advanced water-treatment process

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Embodiment 1

[0034] The method for controlling bromate generation in the ozone / activated carbon advanced water treatment process of the present embodiment may further comprise the steps:

[0035] The raw water body of Taihu Lake was taken as a water sample. The temperature of the raw water body was 16°C, the pH value was 8.15, the oxygen consumption was 3.4 mg / L, and the concentration of the bromate precursor bromide ion was 110 μg / L. Add 4mg / L of available chlorine in the water to carry out pre-chlorination reaction, the time is 60min, then feed 3mg / L of ozone, after reacting for 30min, test the content of bromate in the water sample, the test results are shown in Table 1.

[0036] Among them, the dosage of available chlorine is less than 5mg / L, and the pre-chlorination time of available chlorine is within 1-180mim.

[0037] The pH value of the raw water is within 5-9, the temperature is within 0-40°C, and the oxygen consumption (COD Mn ) within 0.2-6.0mg / L is acceptable.

[0038] The c...

Embodiment 2

[0041] The method for controlling bromate generation in the ozone / activated carbon advanced water treatment process of the present embodiment may further comprise the steps:

[0042] The raw water body of Taihu Lake was taken as a water sample. The temperature of the raw water body was 16°C, the pH value was 8.15, the oxygen consumption was 3.7mg / L, and the concentration of the bromate precursor bromide ion was 110μg / L. Add 2mg / L of available chlorine to carry out pre-chlorination reaction, the time is 60min, then feed 3mg / L of ozone, after reacting for 30min, test the content of bromate in the water sample, the test results are shown in Table 1.

Embodiment 3

[0044] The method for controlling bromate generation in the ozone / activated carbon advanced water treatment process of the present embodiment may further comprise the steps:

[0045] The raw water body of Taihu Lake was taken as a water sample, wherein the temperature of the raw water body was 10°C, the pH value was 7.0, the oxygen consumption was 3.6 mg / L, and the bromide precursor bromide ion concentration was 155 μg / L. Add 1mg / L of available chlorine in the water to carry out pre-chlorination reaction, the time is 60min, then feed 3mg / L of ozone, after reacting for 30min, test the content of bromate in the water sample, the test results are shown in Table 1.

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Abstract

The invention provides a method for controlling generation of bromate in an ozone / activated carbon advanced water-treatment process. The method comprises the following steps that available chlorine is added into a raw water body, and then the ozone / activated carbon advanced water-treatment process is conducted after bromide ions in the raw water body are converted into hypobromous acid. By adoption of the method for controlling generation of the bromate in the ozone / activated carbon advanced water-treatment process, the problems that the economical efficiency is poor and the treatment efficiency is low in the prior art are solved, the method has the characteristics of being low in cost, obvious in control effect, easy to operate and the like, and accordingly, the method is wide in application range and achieves application to practical production to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of ozone advanced treatment, and in particular relates to a method for controlling bromate generation in an ozone / activated carbon advanced water treatment process. Background technique [0002] The ozone / activated carbon process is one of the most commonly used advanced treatment processes for drinking water. This process can effectively inactivate microorganisms and oxidize refractory organic matter. However, when raw water contains bromide ions (Br ‐ ), after ozone oxidation, bromate (BrO 3 ‐ ). According to reports, Br ‐ Concentrations in freshwater and seawater are as high as 1mg / L and 80mg / L, respectively. In recent years, due to seawater intrusion, Br ‐ The concentration is increasing, the effluent BrO 3 ‐ The concentration increased accordingly, and the study found that BrO in drinking water 3 ‐ The concentration can be as high as 127μg / L. Due to BrO 3 ‐ It has a high possibility of carc...

Claims

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Application Information

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IPC IPC(8): C02F1/76C02F1/78C02F101/12
CPCC02F1/76C02F1/78C02F2101/12C02F2103/007
Inventor 于水利肖倩闫慧敏
Owner TONGJI UNIV
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