Method for controlling generation of iodo-trihalomethanes in drinking water

A technology of trihalomethane iodide and drinking water, which is applied in the field of drinking water treatment, can solve the problems that no one has ever been involved in, and does not have continuous disinfection capabilities, so as to achieve outstanding safety, reduce the risk of carcinogenic by-products, and reduce the amount of production Effect

Inactive Publication Date: 2016-09-28
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult for ferrate to exist stably in water, and it will react completely in a short period of time, so it does not have continuous disinfection ability
Therefore, there are few precedents of applying ferrate to drinking water disinfection treatment, and the method of using ferrate and chlorine (amine) in combination to disinfect drinking water while controlling the risk of I-THMs formation has never been involved.

Method used

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  • Method for controlling generation of iodo-trihalomethanes in drinking water
  • Method for controlling generation of iodo-trihalomethanes in drinking water
  • Method for controlling generation of iodo-trihalomethanes in drinking water

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 10 μM iodide ions to the raw water of Huangpu River, control the temperature at 25°C, and pH 7, add potassium ferrate to the reaction solution for pre-oxidation test, and conduct static sedimentation and membrane filtration on the reaction solution after 30 minutes, and filter the water separately Add 3mg / L chlorine and chloramines. Calculated according to the concentration of substances in water, when the dosage of potassium ferrate is 0mg / L, 1mg / L, 2mg / L, and 3mg / L, the formation of I-THMs is as follows: figure 1 shown.

[0029] from figure 1 It can be seen that the formation of I-THMs varies greatly under the condition of different dosage of high-speed rail. In the reaction solution without adding potassium ferrate, the amount of I-THMs generated during the chlorination and chloramination processes was close to 200 μg / L. When the dosage of potassium ferrate reached 1 mg / L, the amount of I-THMs generated during the chlorination process The reduction was more th...

Embodiment 2

[0031] Add 10 μM iodide ions to the raw water of Huangpu River, control the temperature at 25°C, adjust the pH of the reaction solution, and add potassium ferrate at 2 mg / L. L Chlorine. When the pH is 5, 6, 7, 8, 9 respectively, the formation of I-THMs is as follows figure 2 shown.

[0032] Potassium ferrate is extremely oxidizing under acidic conditions, and can quickly oxidize iodide ions to iodate, and at the same time remove a large amount of natural organic matter. The simultaneous action of the two results in a sharp reduction in the generation of I-THMs.

Embodiment 3

[0034] Add 10 μM iodide ions to the raw water of Huangpu River, control the temperature at 25°C, adjust the pH of the reaction solution, and add potassium ferrate at 2 mg / L. L Chloramine. When the pH is 5, 6, 7, 8, 9 respectively, the formation of I-THMs is as follows image 3 shown.

[0035]Chloramine is less oxidative than free chlorine, and chloramine can only oxidize iodide ions to active iodine species, but cannot further oxidize to iodate. Therefore, the generation of I-THMs in the chloramine disinfection process is much larger than that in the chlorination disinfection process. However, the addition of potassium ferrate under acidic conditions can completely avoid the formation of I-THMs in the process of chloramine disinfection. Although the formation of I-THMs cannot be completely avoided under alkaline conditions, the amount of formation is negligible.

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Abstract

The invention relates to a method for controlling the formation of iodotrihalomethanes in drinking water, comprising the following steps: (1) adjusting the pH value of the water to be treated to pH≤9, then adding potassium ferrate to the water to be treated, stirring Make it mix and react; (2) the solution after the reaction is filtered by natural sedimentation and microfiltration membrane to obtain iodine-free water; (3) add disinfectant to the iodine-free water gained in step (2) for disinfection , that is, drinking water. Compared with the prior art, the present invention controls the generation risk of I-THMs in drinking water without complicated and lengthy operation process, and can avoid the formation of I-THMs at acidic and neutral pH, and can be used respectively at pH=9. The I‑THMs produced by subsequent chlorination/chloramination were reduced by 94.5% and 84.1%, which can effectively reduce the carcinogenic risk of by-products caused by the use of chlorine and chloramine disinfection.

Description

technical field [0001] The invention relates to the technical field of drinking water treatment, in particular to a method for controlling the formation of iodotrihalomethanes in drinking water. Background technique [0002] Disinfection of drinking water is a great progress in public health in the 20th century. According to data, the use of chlorine disinfection reduces the incidence of cholera by 90%, the incidence of typhoid by 80%, and the incidence of amoebic dysentery by 50%. However, in 1974, Rook and Bella et al. discovered that trihalomethanes (THMs) would be produced during chlorine disinfection of drinking water. Two years later, the American Cancer Institute (NCI) announced that chloroform was carcinogenic, making drinking water disinfection by-products (DBPs) a Hot spots of people's attention. Iodotrihalomethanes (I-THMs) are new halogenated by-products, which represent toxic and harmful organic substances containing iodine element produced after disinfection o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/444C02F1/50C02F1/66C02F1/72C02F2001/007
Inventor 徐斌张民盛张天阳王安琪邹相昀夏圣骥
Owner TONGJI UNIV
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