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Method for oxidizing iodide ions into iodate by using ferrate and controlling generation of iodo-disinfection byproducts in water

A technology of disinfection by-products and ferrate, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problems of iodized disinfection by-products and reduce the generation of iodized disinfection by-products Possibility, suitable for large-scale application, and the effect of promoting transformation

Inactive Publication Date: 2020-02-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that iodide ions and natural organic matter exist in the existing water body, which lead to the generation of iodo disinfection by-products under the traditional disinfection method, and provide the method of using ferrate to oxidize iodide ions into iodate and control the iodine in water. Methods to replace disinfection by-products

Method used

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Comparison scheme
Effect test

specific Embodiment approach 1

[0016] Specific embodiment one: this embodiment utilizes ferrate to oxidize iodide ions into iodate and control the method that iodine disinfection by-products in water generate, specifically according to the following steps:

[0017] The method is completed by adding ferrate into the water source containing iodine ions to carry out oxidation reaction.

[0018] The ferrate described in this embodiment is a green oxidizing agent, which has strong oxidizing properties in a wide pH range, and its oxidation is selective, and it is easy to oxidize compounds containing electron-rich groups, such as phenols, amines, and olefins and compounds containing nitrogen and sulfur. The final reduction product of ferrate is ferric iron, further hydrolysis has a certain coagulation effect, it is removed in the coagulation, precipitation and filtration stages, and it is environmentally friendly, non-toxic and harmless after discharge. Under neutral conditions, the rate constant of the reaction ...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ferrate is potassium ferrate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: after ferrate is added, the concentration of ferrate in the water source is 1.7-5.6 mg / L. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for oxidizing iodide ions into iodate by using ferrate and controlling generation of iodo-disinfection byproducts in water, and relates to the field of water treatmentmethods. The purpose of the invention is to solve the problem of the iodo-disinfection byproducts formed by iodide ions and natural organic matters existing in water during treatment in a traditionaldisinfection mode. The method comprises the following steps: adding the ferrate into a water source containing iodide ions, and carrying out an oxidation reaction to complete the method. Potassium ferrate is used as a strong oxidant to rapidly oxidize iodine ions in water into hypoiodic acid, and when the concentration of the hypoiodic acid in the system is accumulated to the maximum value, the hypoiodic acid is gradually oxidized into iodate by the potassium ferrate, so that the concentration of the hypoiodic acid is reduced, and the possibility that the hypoiodic acid reacts with organic matters to generate the iodo-disinfection byproducts is reduced. The increase of the concentration of potassium ferrate can promote the conversion of iodide ions and hypoiodic acid into iodate, the generation amount of the iodo-disinfection byproducts is small, and the method is suitable for large-scale application. The method is used for treating the iodine ion-containing water source.

Description

technical field [0001] The invention relates to the field of water treatment methods. Background technique [0002] A large number of animal experiments have shown that trihalomethanes are teratogenic, carcinogenic and mutagenic. If the trihalomethanes in animals reach a certain concentration, it may cause intestinal, kidney and liver tumors. Among the halogenated DBPs, the iodo-DBPs showed greater toxicity than the chlorine-bromine DBPs. Iodine products are mainly produced during the disinfection process: in the process of disinfecting iodized water, iodide ions will be oxidized by chlorine and chloramine and other disinfectants into hypoiodous acid with a certain oxidizing ability. Hypoiodous acid can be converted through three paths: the first is to oxidize hypoiodous acid to non-toxic iodate through the continuous oxidation of disinfectants; the second is to decompose into non-toxic iodate through self-disproportionation reaction of hypoiodous Toxic and harmless iodid...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/12
CPCC02F1/72C02F2101/12
Inventor 马军张婧王宪实刘玉蕾王鲁
Owner HARBIN INST OF TECH
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