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Method for jointly disinfecting drinking water by sequentially adding chlorine dioxide and chloramine

A chlorine dioxide and drinking water technology, applied in the direction of sterilization/microdynamic water/sewage treatment, etc., to achieve the effect of low production cost and low consumption

Inactive Publication Date: 2009-12-09
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method for sequentially adding chlorine dioxide-chloramines to drinking water for joint disinfection. Advantages of disinfectants that can effectively reduce the risk of drinking water chemicals caused by existing chlorine disinfection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the water filtered in the tap water treatment process, add 0.10 mg / L chlorine dioxide solution, stir and mix well, react for 10 minutes, then add 0.5 mg / L chloramine solution, and react for 30 minutes.

Embodiment 2

[0019] In the water filtered in the tap water treatment process, add 0.15 mg / L chlorine dioxide solution, stir and mix well, react for 12 minutes, then add 0.3 mg / L chloramine solution, and react for 25 minutes.

Embodiment 3

[0021] Add 0.20 mg / L chlorine dioxide solution to the filtered water in the tap water treatment process, stir and mix well, react for 8 minutes, then add 1 mg / L chloramine solution, and react for 20 minutes.

[0022] Experimental results:

[0023] The inactivation rate of the total number of bacteria reaches more than 98%, and the inactivation rate of Escherichia coli reaches 100%. Inorganic disinfection by-product chlorite is below 0.5 mg / L, or even not detected, the sum of trihalomethanes is controlled below 16 μg / L, five kinds of haloacetic acids (monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, The sum of bromoacetic acid and dibromoacetic acid) is controlled below 52 μg / L. All meet my country's "Drinking Water Hygienic Standards" (GB 5749-2006).

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PUM

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Abstract

The invention relates to a method for jointly disinfecting drinking water by sequentially adding chlorine dioxide and chloramine, which comprises the following steps: in the tap water processing technology, adding and uniformly stirring 0.10-0.20mg / L of chlorine dioxide solution into the filtered water for reaction for 8-12min, and then, adding 0.3-1.0mg / L of chloramine solution for reaction for 20-30-min. The method for jointly disinfecting drinking water by sequentially adding chlorine dioxide and chloramine has the advantages of less disinfectant consumption, obvious sterilizing effect, strong continuous disinfecting capability and less generating quantity of side products caused by disinfection, and can effectively ensure the safety of microorganisms and chemical substances of the drinking water. In addition, compared with the traditional chlorine disinfecting method, the invention also has the advantages of low disinfecting cost, economy and feasibility. The method for jointly disinfecting drinking water by sequentially adding chlorine dioxide and chloramine can be used for water works adopting chlorine disinfecting technology to change the technology and has good application prospects.

Description

technical field [0001] The invention relates to the application field of disinfection technology, in particular to a method for sequentially adding chlorine dioxide-chloramine to combined disinfection of drinking water. Background technique [0002] The safety of drinking water includes two aspects: one is the safety of microorganisms, that is, drinking water does not contain microorganisms, viruses or bacteria that are harmful to human health. The second is the safety of chemical substances, which means that the chemical substances in drinking water do not have side effects on the human body or do not produce toxic effects on the human body within a certain period of time. While the traditional chlorine disinfection process reduces the risk of microorganisms in drinking water, it also increases the risk of chemicals in drinking water due to the formation of disinfection by-products, and the disinfectant itself also has a certain impact on the safety of drinking water. To e...

Claims

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Application Information

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IPC IPC(8): C02F1/50
Inventor 吴立波易芳王启山王丽坤查甫更孙晓明宫玥刘艳芳李维尊
Owner NANKAI UNIV
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