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Method for degrading smelly substance in water through oxidizing agent activated by ferrous iron

A technology of smelling substances and oxidants, which is applied in the field of water treatment technology to achieve good degradation effects, easy storage, transportation and use, and easy promotion and application

Active Publication Date: 2015-11-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports or patents on the use of ferrous activated persulfate to degrade odorous substances in water so far. CN103818993A discloses a method for advanced oxidation of ferrous activated persulfate or monoperoxyhydrogensulfate to treat papermaking wastewater. Method, what it handles is papermaking wastewater; There are also some other methods to remove odor substances in water, such as: CN103121732A discloses a method for removing odor substances in water, this method is to combine photocatalysis and ultrafiltration membrane Removal of odor substances; CN102092899A discloses a system and method for removing natural organic matter and olfactory substances in slightly polluted water, but this method uses biological aerated filter towers and ultrafiltration membranes

Method used

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  • Method for degrading smelly substance in water through oxidizing agent activated by ferrous iron
  • Method for degrading smelly substance in water through oxidizing agent activated by ferrous iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Take 7 headspace vials containing 3gNaCl and 0.2mL of 2-isobutyl-3-methoxypyrazine (IBMP) with a concentration of 10ng / L, and prepare the concentrations as 10, 20, 50, 100, 200 , 500, 1000ng / L of 2-MIB or GSM, and measure with gas chromatography-mass spectrometer (GC-MS: GasChromatography-MassSpectrometer), make a standard curve, such as figure 1 as shown, figure 1 The standard curve for measuring 2-MIB prepared by the internal standard method for the embodiment of the present invention, the internal standard substance is 2-isobutyl-3-methoxypyrazine (IBMP). The abscissa is A 2-MIB / A IBMP , represents the ratio of the peak area measured by the substance in gas chromatography-mass spectrometer (GC-MS: GasChromatography-MassSpectrometer), and its ordinate represents the concentration of the prepared 2-MIB, and its measured data trend The fitting equation of the line is y=1378.6x-16.077, where the linear coefficient is R 2 =0.9991, which can meet the measurement n...

Embodiment 2

[0038] On the basis of the method in Example 1, the concentration of 2-MIB or GSM is 1000ng / L, the concentration of sodium persulfate and ferrous sulfate heptahydrate is 0.5mM, react at normal temperature, and the reaction time is 120min. The pH of the reaction was measured with a concentration of 1 x 10 -3 mol / L of hydrochloric acid or sodium hydroxide, adjust the pH of the solution to experiment under the conditions of 3, 7, and 8. The experimental results are shown in Table 2.

[0039] Table 2

[0040] pH value

[0041] This embodiment utilizes ferrous ions to activate persulfates (sodium persulfate, potassium hydrogen persulfate, etc.) to degrade the refractory odor and taste substances (2-MIB, GSM) etc. in water bodies under different pH conditions. Under neutral and acidic conditions, it can effectively reduce the smell in water and purify water quality. Compared with Fenton oxidation method, ozone oxidation method, wet oxidation method and other methods, thi...

Embodiment 3

[0043]On the basis of the method in Example 1, the concentration of 2-MIB or GSM was 1000ng / L, pH=7, and the reaction was carried out at normal temperature, and the reaction time was 120min. The molar ratio of the concentration of sodium persulfate to ferrous sulfate heptahydrate was 1:1, and the experiments were carried out under the conditions of 0.1mM, 0.5mM, 1mM and 1.5mM respectively, and the degradation effects were measured respectively. The measurement results are shown in Table 3.

[0044] table 3

[0045] Concentration of sodium persulfate (mM)

[0046] In this example, ferrous ions are used to activate different concentrations of persulfates (sodium persulfate, potassium hydrogen persulfate, etc.) to degrade odorous substances (2-MIB, GSM) that are difficult to degrade in water bodies, and the degradation effect can be seen slightly increased with increasing persulfate concentration.

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Abstract

The invention discloses a method for degrading a smelly substance in water through an oxidizing agent activated by ferrous iron. The method includes the following steps that an oxidizing agent and ferrous iron solution is added into the water with the smelly substance for reaction, and sampling analysis is performed after the reaction to obtain the degradation result of the smelly substance in the water. The smelly substance is 2-methylisoborneol or geosmin, the oxidizing agent is persulfate or mono potassium peroxysulfate, and the ferrous iron is a substance releasing ferrous ions. The method is environmentally friendly and will not generate secondary pollution, a good effect can be achieved at a normal temperature just by adding the reagent into the water with the smelly substance needing to be degraded, the good degradation effect can be achieved no matter whether under neutral pH or acidic pH, it is unnecessary to arrange other devices, operation is simple, storage and transportation are easy, and the method can be used for degrading the smelly substance in the water.

Description

technical field [0001] The invention belongs to the application field of water treatment technology and relates to a method for degrading odor and smell substances in water. Background technique [0002] At present, many studies have been carried out at home and abroad on the degradation of odor and smell substances, including the following methods: traditional techniques (coagulation, sedimentation, sand filtration), chemical oxidation, adsorption and biological treatment. Although the traditional process has a certain effect on the degradation of odor, it is not ideal, and it still needs to rely on other advanced treatment processes; using chemical oxidants such as chlorine, ozone, chlorine dioxide and potassium permanganate, etc., although it can degrade part of the odor Substances, but the new substances generated by the oxidation of other substances by oxidants or the residual oxidants themselves also have unpleasant odors; compared with other methods, biodegradation is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/58
Inventor 黎雷赵来财郭海成李建峰贺玲董子萱郭婧轩张均刘建伟王帅锋
Owner TONGJI UNIV
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