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Method for treating refractory organic pollutants in wastewater by dithionite-activated persulfates

A technology of hydrosulfite and activated persulfate, applied in water pollutants, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems that hinder the wide application of persulfate technology and lack practical application value and potential , the problem of high energy consumption of persulfate technology, to achieve the effect of large application potential, low cost and easy operation

Pending Publication Date: 2019-07-09
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two methods have their own shortcomings. The energy-excited persulfate technology has high energy consumption and harsh technical conditions, and the metal toxicity caused by the transition metal introduced in the transition metal activation technology may cause secondary pollution. These Factors have hindered the widespread application of persulfate technology in organic wastewater treatment
[0014] In addition, in recent years, some researchers have found that persulfate also has the ability to generate active particles when using some refractory organic pollutants, such as benzoquinone, quinone-containing refractory organic pollutants, phenol, etc. also have the ability to activate Persulfate produces strong active groups such as free radicals or singlet oxygen, but since quinones and phenols are refractory organic pollutants themselves are environmental pollutants, the use of persulfate activation lacks practical application value and potential

Method used

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  • Method for treating refractory organic pollutants in wastewater by dithionite-activated persulfates
  • Method for treating refractory organic pollutants in wastewater by dithionite-activated persulfates
  • Method for treating refractory organic pollutants in wastewater by dithionite-activated persulfates

Examples

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Effect test

Embodiment 1

[0033] Example 1: Dithionite activates persulfate to degrade atrazine-containing organic wastewater

[0034] Take four opaque reaction containers, add organic waste water containing 1 μmol / L atrazine to each of them, the pH in the reactors is about 7.2, and the reaction temperature is 30 ° C. At the same time, the four reactors are stirred slowly to make them Uniform response;

[0035] In reaction vessel 1, add sodium dithionite solution so that its concentration is 0.2mmol / L, add potassium persulfate solution into reaction vessel 2 and make its concentration 0.5mmol / L, in reaction vessel 3, add sodium dithionite solution and Potassium persulfate solution made its concentration 0.2mmol / L and 0.5mmol / L respectively, and reactor 4 was used as a blank control, and the reaction was basically completed after continuing for 1h, and then the remaining concentration of atrazine in the wastewater was detected, and the detection results were shown in the following table Shown:

[0036...

Embodiment 2

[0039] Example 2: Dithionite activates persulfate to degrade bisphenol A-containing organic wastewater

[0040] Take four opaque reaction containers, add organic waste water containing 2 μmol / L bisphenol A to each of them, the pH in the reactors is about 4.0, and the reaction temperature is 30°C. At the same time, stir the four reactors at a slow speed to make them uniform. reaction;

[0041]Add sodium dithionite solution to reaction vessel 1 to make its concentration 0.5mmol / L, add potassium persulfate solution to reaction vessel 2 to make its concentration 0.5mmol / L, add sodium dithionite solution to reaction vessel 3 at the same time and potassium persulfate solution so that the concentration is 0.5mmol / L, reactor 4 is used as a blank control, and the reaction is basically completed after continuing for 0.5h, and then the residual concentration of bisphenol A in the wastewater is detected, and the detection results are shown in the following table:

[0042] Table 2 Dithion...

Embodiment 3

[0045] Example 3: Dithionite activates different concentrations of persulfate to degrade atrazine-containing organic wastewater

[0046] Take six opaque reaction containers, add organic waste water containing 1 μmol / L atrazine to each of them, the pH in the reactors is about 7.2, and the reaction temperature is 30 ° C. At the same time, the six reactors are stirred slowly to make them Uniform reaction; add sodium dithionite solution and potassium persulfate solution to reaction vessel 1 at the same time to make the concentration respectively 0.2mmol / L and 0.05mmol / L, add sodium dithionite solution and potassium persulfate solution to reaction vessel 2 Make the concentrations respectively 0.2mmol / L and 0.1 mmol / L, add sodium dithionite solution and potassium persulfate solution to the reaction vessel 3 at the same time so that the concentration is 0.2 mmol / L, add dithionite solution to the reaction vessel 4 at the same time Sodium sulfite solution and potassium persulfate solut...

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Abstract

The invention relates to a method for treating refractory organic pollutants in wastewater by dithionite-activated persulfates, which comprises the following steps: sequentially adding a dithionite and a persulfate into wastewater containing therefractory organic pollutants, and conducting reacting to obtain treated wastewater, wherein the molar ratio of the persulfate to the refractory organic pollutants in the wastewater is 1:1 to 500:1. The method has the characteristics that the method is carried out under the conditions of normal temperature, normal pressure, acidity or neutrality, no external energy is used, the risk of secondary pollution to the environment is avoided, the operation is simple, the degradation effect on the refractory organic pollutants in the environment is good, and the method has great application potential in the field of environmental pollution treatment.

Description

technical field [0001] The invention relates to a method for treating refractory organic pollutants in waste water, in particular to a method for treating refractory organic pollutants in waste water by activating persulfate with dithionite. Background technique [0002] Persistent refractory organic pollutants persist in the environment for a long time, are highly harmful, difficult to deal with, and have bioaccumulation. The research on the treatment technology of such pollutants has always been a research hotspot in the field of environmental protection science and technology at home and abroad. Among them, the advanced oxidation process (AOPs) has the potential and ability. [0003] Advanced oxidation processes have been widely used to remove refractory organic pollutants in drinking water and wastewater, which are mainly based on the in situ generation of highly reactive oxygen species, such as hydroxyl radicals ( OH), sulfate radicals (SO 4 ·- ), superoxide radicals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30C02F101/36C02F101/38
CPCC02F1/72C02F2101/30C02F2101/36C02F2101/38C02F2305/023
Inventor 李继宋伟张小磊王卓悦付彩霞杨兢欣
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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