Co-used iron-carbon micro-electrolysis and photo degradation two-section perfluoro octanoic acid degradation method

An iron-carbon micro-electrolysis, perfluorooctanoic acid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water pollutants, etc., can solve the problems of few applications, low degradation efficiency, slow speed, etc. simple conditional effect

Inactive Publication Date: 2015-07-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some conventional advanced oxidation techniques (such as O 3 , O 3 /UV,O 3 /H 2 o 2 and H 2 o 2 /Fe 2+ ) cannot effectively degrade
At present, although many researchers have carried out research on the removal and recovery of different perfluorinated compounds by means of biodegradation, redox, high-temperature incineration, etc.,...

Method used

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  • Co-used iron-carbon micro-electrolysis and photo degradation two-section perfluoro octanoic acid degradation method
  • Co-used iron-carbon micro-electrolysis and photo degradation two-section perfluoro octanoic acid degradation method

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Embodiment 1

[0030] An iron-carbon micro-electrolysis-VUV / Fenton two-stage method for synergistically degrading perfluorooctanoic acid in water (iron-carbon micro-electrolysis), the method is composed of iron-carbon micro-electrolysis reaction and photodegradation reaction. The iron-carbon micro-electrolysis reaction device includes a stirring paddle 1 and a reactor 3 containing an aqueous solution containing perfluorooctanoic acid, and the stirring paddle 1 is placed in the middle of the reactor 3 . The reactor 3 is a cylindrical vessel made of polytetrafluoroethylene, on which a sampling tube 2 is arranged, and the aqueous solution 4 in the reactor 3 is composed of a perfluorooctanoic acid aqueous solution, activated carbon and iron powder. The photodegradation reaction device includes a timing constant temperature magnetic stirrer 10 and a photodegradation reactor 9, and the photodegradation reactor 9 is placed on the timing constant temperature magnetic stirrer 10. An ultraviolet lamp ...

Embodiment 2

[0040] The difference between this embodiment and embodiment 1 is:

[0041] Present embodiment does not carry out iron-carbon micro-electrolysis reaction, comprises the following steps:

[0042] a) Join the PFOA solution to be treated in the photodegradation reactor, turn on the magnetic stirrer, close the compartment 11, turn on the ultraviolet lamp 7 (the exterior is provided with an ultraviolet lamp lampshade 8), and react for 6 hours:

[0043] b) Turn off the UV lamp power supply 6, the reaction is finished, and the water is discharged, and the fluoride ion selective electrode is used to measure F - concentration to determine the defluorination rate.

[0044] After testing, the UV lamp alone has a defluorination rate of 39.89% for PFOA, indicating that the UV lamp has a certain photolysis effect on PFOA.

Embodiment 3

[0046] The difference between this embodiment and embodiment 1 is:

[0047] The method for utilizing the device to degrade PFOA in water comprises the steps:

[0048] a) Carry out pretreatment to activated carbon, take quantitative activated carbon, soak in the solution to be treated for 24 hours, rinse with ultrapure water, and dry for subsequent use;

[0049]b) Add the PFOA solution to be treated into the reactor, add pretreated activated carbon 12.5g / L and iron powder 7.5g / L at the same time, adjust the pH of the reaction solution to 3.0 with 0.1mol / L NaOH and HCl; open stirring paddle, react for 1 hour;

[0050] c) Turn off the stirring paddle, the iron-carbon micro-electrolysis reaction is completed, filter the water, inject it into the photodegradation reactor, adjust the pH to 3.0 with 0.1mol / L NaOH and HCl, turn on the ultraviolet power supply, and react for 6 hours;

[0051] d) Turn off the ultraviolet light power supply, the reaction is completed, and the water is ...

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Abstract

The invention discloses a co-used iron-carbon micro-electrolysis and photo degradation two-section perfluoro octanoic acid degradation method. The method comprises the following steps: (a) active carbon pretreatment: soaking active carbon in a perfluoro octanoic acid solution to be processed for 24 hours, washing the active carbon by ultrapure water, and drying the active carbon for later use; (b) adding the perfluoro octanoic acid water solution to be processed in to an iron-carbon micro-electrolysis reactor, adding iron powder and processed active carbon simultaneously, controlling the primary pH value of the reactions at a range of 2 to 4, carrying out reactions at a room temperature under stirring for one hour, and discharging the effluent; (c) subjecting the effluent to suction filtering, then introducing the effluent into a photo degradation reactor, adding H2O2 as the oxidant at the same time, controlling the pH value in a range of 2 to 4, installing an ultraviolet lamp; carrying out reactions at a constant temperature under stirring for 3 to 5 hours, and finally discharging the effluent. The provided method is simple, the two-section cooperative system fully utilizes the functions of the electrolysis and photo degradation, and the fluorine is effectively removed from PFOA.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering water treatment, and relates to a treatment method for perfluorochemicals such as persistent organic pollutants perfluorooctanoic acid (PFOA) in water bodies, specifically a method for degrading perfluorooctanoic acid (PFOA) in water based on iron-carbon micro-electrolysis-VUV / Fenton system )Methods. Background technique [0002] Perfluorinated compounds (PFCs) are widely used in chemical industry, machinery industry, textile industry, paper industry and other industries. Perfluorosulfonic acid and perfluorooctanoic acid (PFOA) are currently the most widely used perfluorinated organic compounds, and they are also the final transformation products of various PFCs in the environment. Its mass production and use have caused serious environmental accumulation and persistent pollution in the global ecosystem. [0003] The chemical properties of PFOA are very stable. So far, no evide...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/36
Inventor 程建华梁小燕张丽红张鹏
Owner SOUTH CHINA UNIV OF TECH
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