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Method for treating wastewater containing low-concentration perfluorooctanoic acid

A technology of perfluorooctanoic acid and treatment methods, applied in water/sewage treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve problems that have not been mentioned

Pending Publication Date: 2021-09-10
SHANGHAI LYMAX ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports on how to dispose of the waste liquid containing a large amount of perfluorooctanoic acid and organic solvent ethanol after regeneration.

Method used

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  • Method for treating wastewater containing low-concentration perfluorooctanoic acid
  • Method for treating wastewater containing low-concentration perfluorooctanoic acid

Examples

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Effect test

Embodiment 1

[0030] Adsorption and regeneration of perfluorooctanoic acid wastewater by activated carbon

[0031] The wastewater discharged from a certain factory contained PFOA at a concentration of about 20-30 mg / L. After being adsorbed by activated carbon, the concentration of PFOA in the effluent was less than 10 mg / L, meeting the discharge requirements;

[0032] In order to verify the regeneration effect of ethanol + sodium chloride on the saturated activated carbon after adsorption of perfluorooctanoic acid, take 25ml of saturated activated carbon, add 50ml of medicament combination of 95wt% ethanol and 3wt% sodium chloride, the volume ratio of ethanol and sodium chloride is 1:1, When the temperature was heated to 40°C in a water bath and the regeneration time was 1 hour, the concentration of perfluorooctanoic acid in the regeneration liquid was detected to be 8465mg / L, which was converted into the amount of desorbed perfluorooctanoic acid per milliliter of activated carbon was 16.93m...

Embodiment 2

[0038] Electrooxidation Treatment of Regenerated Waste Liquid

[0039]Take a certain amount of regenerated waste liquid and put it into the electrolysis device for electrolysis, and control the current density to 150mA / cm 2 , the initial concentration of perfluorooctanoic acid in the regeneration waste liquid was 4356.23mg / L, the concentration of ethanol was about 5wt%, and the concentration of sodium chloride was about 1.5wt%. 31%;

[0040] Take a certain amount of the same regeneration waste liquid as above and put it into the electrolysis device, add the amount of sulfate radical with the same concentration as perfluorooctanoic acid, and carry out electrolysis, control the current density to 150mA / cm2, and the initial concentration of perfluorooctanoic acid in the regeneration waste liquid is 4356.23mg / L , the concentration of ethanol is about 5wt%, the concentration of sodium chloride is about 1.5wt%, after electrolysis for 3 hours, the concentration of perfluorooctanoic ...

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Abstract

The invention discloses a method for treating wastewater containing low-concentration perfluorooctanoic acid. The method comprises the following steps that the wastewater containing low-concentration perfluorooctanoic acid passes through activated carbon adsorption equipment; the wastewater reaching the standard after passing through the activated carbon adsorption equipment can be directly discharged or subjected to next-step treatment, and the activated carbon saturated by adsorption is transferred to activated carbon regeneration equipment and regenerated by using an ethanol and sodium chloride medicament combination; the regenerated activated carbon is transferred to the activated carbon adsorption equipment for continuous adsorption; the regeneration waste liquid is firstly pumped into evaporation equipment from a waste liquid collecting tank through a lifting pump, so as to recycle the ethanol through evaporation and realize reuse of the ethanol, and the residual mother liquid is discharged into a mother liquid collecting device; and after evaporation, the mother liquor is pumped into an electrolytic oxidation device from the mother liquor collecting device through a water pump, and the electrolytic oxidation device is mainly used for oxidizing perfluorooctanoic acid in the mother liquor. The method can realize up-to-standard discharge of the perfluorooctanoic acid-containing wastewater and innocent treatment of the regenerated waste liquid.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for wastewater containing low-concentration perfluorooctanoic acid. Background technique [0002] Perfluorinated substances are mainly artificially synthesized compounds with very stable structures and special physical and chemical properties such as hydrophobicity and oleophobicity. At present, they have become one of the important raw materials in the industry. It is precisely because of its stable structural properties that it is difficult to degrade in the natural environment. Studies have shown that perfluorinated substances can accumulate in organisms and have certain carcinogenicity to humans. In recent years, with the increase of perfluorinated substances detected in environmental water bodies, more and more people pay attention to the discharge of wastewater containing perfluorinated substances. [0003] As one of the typical perfluorina...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F9/10B01J20/34B01J20/30C02F101/36C02F101/34
CPCC02F1/283C02F1/04C02F1/4672B01J20/3475B01J20/3416C02F2101/36C02F2101/34C02F2303/16
Inventor 王海军黄亚君方树鹏
Owner SHANGHAI LYMAX ENVIRONMENTAL TECH CO LTD
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