Method for promoting Fenton oxidation, system for promoting Fenton oxidation reaction and application

A Fenton oxidation and reaction system technology, applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc. , the effect of improving the reaction speed and efficiency

Inactive Publication Date: 2021-07-09
北京启元汇通水务科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because coking wastewater contains a large amount of toxic, harmful and refractory high-concentration organic pollutants, it has the characteristics of complex components, large changes in water quality and quantity, and poor biodegradability, which makes it difficult for the effluent to meet the standards. It is a typical difficult-to-treat industrial wastewater.
According to the disclosure of the China Coking Industry Association, at present, the total coke production capacity of the overall domestic coking industry is 560 million tons, coking wastewater treatment generally adopts biochemical combined advanced treatment technology, and most enterprises now implement the "Coking Chemical Industry Pollutant Discharge Standard" (GB16171-2012 ) Table 2 and discharge standards, because some areas require zero discharge and some enterprises back-end to achieve partial reuse through membrane system treatment, resulting in a large amount of membrane concentrated water has become a new difficulty in pollution treatment
The advanced treatment processes that have been applied so far, such as Fenton oxidation technology, ozone catalytic oxidation technology and electrocatalytic oxidation technology, etc., have not yet reached the "Coking Chemical Industry Pollutant Emission Standard" (GB16171) due to the technical inflection point in the removal of COD and other pollution factors. -2012) Special emission restriction table 3 in-line requirements, and no ultra-low emission engineering cases and related technical process content

Method used

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  • Method for promoting Fenton oxidation, system for promoting Fenton oxidation reaction and application
  • Method for promoting Fenton oxidation, system for promoting Fenton oxidation reaction and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In a coking plant CODcr = 325mg\L coking waste water was added a suitable proportion of Fenton reagent (the molar ratio of ferrous ion and hydrogen peroxide was 1:8), the pH value was controlled at 3.5, and it was divided into 8 identical groups Groups 1 to 4 introduce a single substance of one of the transition metals to promote the oxidation of Fenton’s agent, taking simple iron as an example; Groups 5 to 8 do not introduce any simple substance of transition metals, transition metal alloys, transition metal compounds, etc., The reaction time is all controlled at a certain value between 30 minutes and 180 minutes. After the reaction was completed, the COD value was tested by the national standard method. The COD values ​​of the 1 to 4 groups were: 27.8mg\L, 23.1mg\L, 21.7mg\L and 24.8mg\L. The COD values ​​of groups 5 to 8 were 117.3mg\L, 125.4mg\L, 120.1mg\L and 127.5mg\L respectively, and the wastewater was degraded stably from COD≥300mg\L to below 30mg\L. The avera...

Embodiment 2

[0044] Taking copper and iron alloys as an example, the two can be alloyed in any proportion. Taking the alloy made at a ratio of 1:20 as an example, an appropriate ratio of Fenton’s agent (the molar ratio of ferrous ion and hydrogen peroxide is 1:8) was added to the coking wastewater of a coking plant with CODcr=325mg\L, and the pH The value is controlled at 3.5, divided into 4 identical groups, and copper-iron 1:20 alloy is added to promote the oxidation of Fenton's agent, and the reaction time is controlled between 30 minutes and 180 minutes. After the reaction was completed, the COD value was tested by the national standard method. The COD values ​​of the four groups were: 24.5mg\L, 22.5mg\L, 25.3mg\L and 22.6mg\L. All from COD ≥ 300mg\L to 30mg\L or less. The consumption of a simple substance of one of the transition metals averaged 0.049% per hour.

Embodiment 3

[0046] Taking elemental copper as an example, add a suitable proportion of Fenton's reagent (the molar ratio of ferrous ion to hydrogen peroxide is 1:8, the pH value is controlled at 3.5, divided into complete For the same 4 groups, elemental copper was added to promote the oxidation of Fenton’s agent, and the reaction time was controlled between 30 minutes and 180 minutes. After the reaction was completed, the COD value was tested by the national standard method, and the COD values ​​of the 4 groups were: 21.9 mg\L, 26.7mg\L, 22.3mg\L and 19.8mg\L. They all degrade stably from COD ≥ 300mg\L to below 30mg\L. The average consumption of the transition metal is 0.027% per hour.

[0047] From the above description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects:

[0048] At present, domestic coking wastewater treatment generally adopts biochemical combined advanced treatment process, including the use of F...

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Abstract

The invention discloses a method for promoting Fenton oxidation, a system for promoting Fenton oxidation reaction and application. The method comprises the following steps of: introducing a transition metal simple substance, a transition metal alloy or a transition metal compound into a Fenton oxidation system as a reducing intermediate bridge substance, and reducing ferric ions in the Fenton oxidation system into ferrous ions. According to the technical scheme, the transition metal elementary substance, the transition metal alloy or the transition metal compound is introduced into the Fenton oxidation system as a reducing intermediate bridge substance, conversion of ferric ions (Fe < 3 + >) into ferrous ions (Fe < 2 + >) in the Fenton oxidation system is achieved, the concentration of ferrous ions (Fe < 2 + >) in the Fenton oxidation system can be kept at a properly high value all the time, the concentration of ferric ions (Fe < 3 + >) is reduced, the Fenton oxidation reaction is prevented from being stopped midway, and the reaction speed and efficiency of the Fenton oxidation system are greatly improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for promoting Fenton oxidation, a reaction system for promoting Fenton oxidation and its application. Background technique [0002] According to statistics, in 2017, the total discharge of wastewater in the country was 77.74 billion tons, of which the discharge of industrial wastewater was 18.29 billion tons, accounting for 23.52% of the total discharge of wastewater. There are a large amount of difficult-to-treat industrial wastewater in industrial wastewater, such as petrochemical, coal coke chemical, printing and dyeing, electroplating, and pharmaceutical industrial wastewater. It is a typical difficult-to-treat industrial wastewater, and an efficient and economical integrated wastewater treatment technology is urgently needed. , in order to achieve ultra-low emissions and resource utilization. [0003] Because coking wastewater contains a large amount of to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
CPCC02F1/722C02F1/725C02F2305/026
Inventor 宋金成虞彤乌力更赵方金崔小龙
Owner 北京启元汇通水务科技股份有限公司
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