Method of removing diclofenac in water by activating peroxyacetic acid with ferrous ions

A technology of diclofenac and peracetic acid, applied in chemical instruments and methods, special compound water treatment, oxidized water/sewage treatment and other directions, can solve the problems of hidden dangers in transportation and storage, low utilization rate, easy decomposition, etc. Low cost, strong fit and simple operation

Inactive Publication Date: 2019-01-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an advanced oxidation technology with low application cost, high treatment efficiency, and easy practical application, Fenton and Fenton-like technology is one of the important methods for treating organic wastewater, but its main problems include: (1) Requirements for the reaction acidic pH conditions (3.0-4.0); (2) the dose is much higher than that of H 2 o 2 Fe 2+ (Usually, H 2 o 2 with Fe 2+ The molar ratio is 1:2~1:3); (3)H 2 o 2 There are potential safety hazards in transportation and storage, and it is easy to decompose under high temperature and light conditions, and the utilization rate is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take the waste water containing diclofenac, add a certain amount of ferrous sulfate and peracetic acid to the waste water, adjust the pH of the solution to 3 with sulfuric acid and sodium hydroxide, and carry out the reaction under stirring conditions, and the stirring speed is 700 r / min. The molar ratio of the peracetic acid to diclofenac was 30:1, the molar ratio of ferrous sulfate to peracetic acid was 1:1, the reaction temperature was 25°C, and the reaction time was 15 min. The concentration of diclofenac in effluent was determined by high performance liquid chromatography. Under the above conditions, the removal rate of diclofenac was 100%. (Note: Diclofenac detection method: use high performance liquid chromatography (Waters 2695, USA) to determine.)

Embodiment 2

[0023] Take the waste water containing diclofenac, add a certain amount of ferrous sulfate and peracetic acid to the waste water, adjust the pH of the solution to 6 with sulfuric acid and sodium hydroxide, and carry out the reaction under stirring conditions, and the stirring speed is 700 r / min. The molar ratio of the peracetic acid to diclofenac was 30:1, the molar ratio of ferrous sulfate to peracetic acid was 1:1, the reaction temperature was 25°C, and the reaction time was 10 min. The concentration of diclofenac in the effluent was determined by high performance liquid chromatography. Under the above conditions, the removal rate of diclofenac was 90%. (Note: Diclofenac detection method: use high performance liquid chromatography (Waters 2695, USA) to determine.)

Embodiment 3

[0025] Take the wastewater containing diclofenac, add a certain amount of ferrous sulfate and peracetic acid to the wastewater, adjust the pH of the solution to 5 with sulfuric acid and sodium hydroxide, and carry out the reaction under stirring conditions, and the stirring speed is 700 r / min. The molar ratio of the peracetic acid to diclofenac was 30:1, the molar ratio of ferrous sulfate to peracetic acid was 0.4:1, the reaction temperature was 35°C, and the reaction time was 10 min. The content of diclofenac in effluent was determined by high performance liquid chromatography. Under the above conditions, the removal rate of diclofenac was 93%. (Note: Diclofenac detection method: use high performance liquid chromatography (Waters 2695, USA) to determine.)

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PUM

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Abstract

The invention discloses a method of removing diclofenac in water by activating peroxyacetic acid with ferrous ions. The method comprises the following steps of adding a proper amount of peroxyacetic acid and a ferrous sulfate solution in wastewater containing a certain concentration of diclofenac, regulating a pH value of the wastewater with sulfuric acid and sodium hydroxide, and performing reaction for a period of time under the condition of performing stirring at a constant speed of 700r / min, wherein the pH value is 3-7, the molar ratio of peroxyacetic acid to diclofenac in the wastewater is (0.4 to 1)-(1 to 1), the proper temperature of the reaction is 25-40 DEG C, and the time required for reaction is 5-15min. The method has the characteristics of mild reaction condition, high degradation efficiency of pollutants, wide source and low cost of an activator, large yield of free radicals of a system, simpleness in technology, convenience in running management, supplementation with sterilization and disinfection functions in the degradation process of the pollutants and the like.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and more particularly relates to a method for removing diclofenac in water by activating peracetic acid with ferrous ions. Background technique [0002] Diclofenac (2[(2,6-dichlorophenyl)amino]phenylacetic acid) is an acetic non-steroidal anti-inflammatory drug widely used in clinical medicine and animal husbandry. When this drug is administered to humans or animals, it is usually difficult to be completely absorbed by the body, and its parent or metabolic intermediates enter municipal sewage through excrement, and eventually accumulate in sewage treatment plants. However, conventional sewage treatment plants lack targeted advanced treatment processes, and traditional biological treatment methods are difficult to effectively degrade such drugs and their derivatives, resulting in a large amount of them being discharged into receiving water bodies. Studies have shown that diclofenac pollutants in w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/34C02F101/36C02F101/38
CPCC02F1/722C02F2101/34C02F2101/36C02F2101/38C02F2303/04C02F2305/02C02F2305/023
Inventor 刘义青王真然付永胜汪诗翔王鸿斌
Owner SOUTHWEST JIAOTONG UNIV
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